Relevant bibliographies by topics / Systems and components (SSCs)

Academic literature on the topic 'Systems and components (SSCs)'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Systems and components (SSCs)"

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Kang, Mi-Yeon, Yeheun Jeong, and Youngsoo Jung. "Assessment Methodology of Practical Configuration Management (CM) for Sustainable Nuclear Power Plants (NPPs)." Sustainability 11, no. 8 (April 22, 2019): 2391. http://dx.doi.org/10.3390/su11082391.

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Since the Fukushima accident in 2011, nuclear safety has emerged as a very important political and social issue. Under this circumstance, the importance of configuration management (CM) is emphasized in order to ensure the reliability and safety of facility. However, configuration management (CM) is still in its conceptual stage in the nuclear industry due to the ambiguity of CM definitions, insufficiency of CM procedures, paucity of computerized systems and lack of CM professionals. In an attempt to address this issue, a previous study proposed a comprehensive CM framework for nuclear power plants (NPPs) by comparing CM concepts in seven different industries where the CM is actively utilized. In order to facilitate the practical implementation of the conceptual framework, this paper proposes an assessment methodology for prioritizing the importance of CM application areas based on the physical subjects of NPP structures, systems, components (SSCs). The proposed methodology is composed of an ‘extended CM framework’ with further details and ‘evaluation criteria’ based on CM functions. This study developed an SSCs list by analyzing Design Control Document (DCD) of Westinghouse AP1000 and also identified evaluation criteria through an extensive literature review. The concept of CM in this study encompasses the entire NPP project life-cycle in order to promote the practical CM application. The results of case-study performed in this paper would provide the SSCs priorities and guidelines for practical configuration management (CM) for sustainable NPP facilities.
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Purba, Julwan Hendry. "Physical Ageing of The Research Reactor Core Structural Materials Due To Neutron Irradiation Exposure: A Review." Jurnal Pengembangan Energi Nuklir 18, no. 2 (March 10, 2017): 93. http://dx.doi.org/10.17146/jpen.2016.18.2.3143.

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A research reactor (RR) is a nuclear reactor that has function to generate and utilize neutron flux and radiation ionization for research purposes and industrial applications. More than 60% of current operating RRs have been operated for 30 years or more. As the time passes, the functional capabilities of structures, systems and components (SSCs) of those RRs deteriorate by physical ageing, which can be caused by neutron irradiation exposure such as irradiation induced dislocation and microstructural changes. To extend the lifetime and/or to avoid unplanned outages, ageing on the safety related SSCs of RRs need to be properly managed. An ageing management is a strategy to engineer, operate, maintenance, and control SSC degradation within acceptablelimits. The purpose of this study is to review physical ageing of the core structural materials of the RRs caused by neutron irradiation exposure. In order to achieve this objective, a wide range of literatures are reviewed. Comprehensive discussions on irradiation behaviors are limited only on reactor vessel and core support structure materials made from zirconium and beryllium as well as their alloys, which are widely used in RRs. It is found that the stability of the mechanical properties of zirconium and beryllium as well as their alloys was mostly affected by the neutron fluences and temperatures.
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Banks, P. J. "Ageing management within British Energy in support of safe, reliable operation and lifetime extension objectives." Kerntechnik 67, no. 4 (August 1, 2002): 200–212. http://dx.doi.org/10.1515/kern-2002-0082.

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Abstract British Energy has established a comprehensive suite of ageing/obsolescence asset management programmes. Through these programmes, the company has developed a thorough understanding of all the potentially significant degradation mechanisms which could affect the systems structures and components (SSCs) which are essential to the safe, reliable operation of their NPPs. The results from these ageing management programmes underwrite the existing design basis safety case, provide trending information for Safety System Reviews (SSRs) and Periodic Safety Reviews (PSRs) and provide data in support of extending the operating lifetimes of the NPPs. This paper describes te UK regulatory framework with respect to ageing management, British Energy’s overall approach to ageing management, The various ageing/obsolescence management programmes established by BEG, including examples of potentially significant ageing issues which have been successfully addressed by these programmes and the manner in which the results from the programmes are used in support of continued operation, SSRs, PSRs, lifetime extension and general performance enhancement.
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St Luce, Shane, and Hiroki Sayama. "Analysis and Visualization of High-Dimensional Dynamical Systems’ Phase Space Using a Network-Based Approach." Complexity 2022 (June 29, 2022): 1–11. http://dx.doi.org/10.1155/2022/3937475.

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The concept of attractors is considered critical in the study of dynamical systems as they represent the set of states that a system gravitates toward. However, it is generally difficult to analyze attractors in complex systems due to multiple reasons including chaos, high-dimensionality, and stochasticity. This paper explores a novel approach to analyzing attractors in complex systems by utilizing networks to represent phase spaces. We accomplish this by discretizing phase space and defining node associations with attractors by finding sink strongly connected components (SSCCs) within these networks. Moreover, the network representation of phase space facilitates the use of well-established techniques of network analysis to study the phase space of a complex system. We show the latter by introducing a new node-based metric called attractivity which can be used in conjunction with the SSCC as they are highly correlated. We demonstrate the proposed method by applying it to several chaotic dynamical systems and a large-scale agent-based social simulation model.
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Tatour, Yasmin, Hadas Bar-Joseph, Ruth Shalgi, and Tamar Ben-Yosef. "Male sterility and reduced female fertility in SCAPER-deficient mice." Human Molecular Genetics 29, no. 13 (June 8, 2020): 2240–49. http://dx.doi.org/10.1093/hmg/ddaa113.

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Abstract Mutations in S-phase cyclin A-associated protein in the endoplasmic reticulum (SCAPER) cause a recessively inherited multisystemic disorder whose main features are retinal degeneration and intellectual disability. SCAPER, originally identified as a cell cycle regulator, was also suggested to be a ciliary protein. Because Scaper mutant males are sterile, we set up to characterize their phenotype. The testes of Scaper mutant mice are significantly smaller than those of WT mice. Histology revealed no signs of spermatogenesis, and seminiferous tubules contained mainly Sertoli cells with a few spermatogonia/spermatogonial stem cells (SSCs). In WT testes, SCAPER is expressed by SSCs and in the various stages of spermatogenesis, as well as in Sertoli cells. In WT spermatozoa SCAPER is not expressed in the flagellum but rather in the head compartment, where it is found both in the nucleus and in the perinuclear region. Scaper mutant females present reduced fertility, manifested by a significantly smaller litter size compared to WT females. Mutant ovaries are similar in size but comprised of significantly less primordial and antral follicles, compared to WT ovaries, while the number of atretic follicles is significantly higher. In WT ovarian follicles SCAPER is expressed in the somatic granulosa cells as well as in the oocyte. In conclusion, our data demonstrate that SCAPER is a crucial component in both male and female reproductive systems. We hypothesize that the reproductive phenotype observed in Scaper mutant mice is rooted in SCAPER’s interaction with cyclin A/Cdk2, which play an important role, however different, in male and female gonads.
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Cancemi, Salvatore Angelo, and Rosa Lo Frano. "Preliminary Analysis of Long-Term Performance of a Piping: Aging and Creep Effects." Materials 14, no. 7 (March 30, 2021): 1703. http://dx.doi.org/10.3390/ma14071703.

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Combining global experience, comprehensive aging knowledge, and predictive methodologies provides ideal prerequisites for the long-term operation strategy (LTO) of a nuclear power plant (NPP). Applying management strategies with an understanding of the ways in which structures relevant for the plant safety perform and interact in their operating environments is of meaningful importance for operating the plant beyond its originally licensed service life. In performing aging studies on the nuclear systems, structure, and components (SSCs), the results are crucial for demonstrating the safety and reliability of the NPP beyond 30 years of nominal operation. In this study, the synergistic effect of a creep mechanism with the alteration suffered by piping material is analyzed by means of MSC©MARC finite element code. Nonlinear analyses were performed to calculate the effects of the long operational period on a primary pipe, assess its degradation, and determine its residual functionality. In these analyses, both homogeneous and inhomogeneous pipe wall thinning are considered, as well as the operating or expected thermal–mechanical loads. The obtained results indicate that thermo–mechanical loads are responsible for pipe deformation, which develops and increases as the transient progresses. Furthermore, an excessive (general or local) wall thinning may determine a dimensional change of the pipe, even causing bending or buckling.
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Tracy, Leslie, and Praveen Kumar Sekhar. "Design and Testing of a Low Voltage Solid-State Circuit Breaker for a DC Distribution System." Energies 13, no. 2 (January 10, 2020): 338. http://dx.doi.org/10.3390/en13020338.

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In this study, a low voltage solid-state circuit breaker (SSCB) was implemented for a DC distribution system using commercially available components. The design process of the high-side static switch was enabled through a voltage bias. Detailed functional testing of the current sensor, high-side switch, thermal ratings, analog to digital conversion (ADC) techniques, and response times of the SSCB was evaluated. The designed SSCB was capable of low-end lighting protection applications and tested at 50 V. A 15 A continuous current rating was obtained, and the minimum response time of the SSCB was nearly 290 times faster than that of conventional AC protection methods. The SSCB was implemented to fill the gap where traditional AC protection schemes have failed. DC distribution systems are capable of extreme faults that can destroy sensitive power electronic equipment. However, continued research and development of the SSCB is helping to revolutionize the power industry and change the current power distribution methods to better utilize clean renewable energy systems.
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Phu, Nguyen Minh. "Overall Optimization and Exergy Analysis of an Air Conditioning System Using a Series-Series Counterflow Arrangement of Water Chillers." International Journal of Air-Conditioning and Refrigeration 27, no. 04 (November 25, 2019): 1950034. http://dx.doi.org/10.1142/s2010132519500342.

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When water chillers are arranged in series-series counterflow (SSCF), the compressor lift of each chiller is decreased in comparison with that of water chillers in parallel. This means that the compressor power of SSCF chillers is lower than that of parallel chillers. In this paper, models of the main components in an air conditioning system were developed and verified to predict the behaviors of the whole system with respect to SSCF chillers. The results showed that performance was maximized with three SSCF chillers when the system was operated with normal set points. The performance was further improved to 26% and decreased with the number of SSCF chillers when the system was operated with optimal set points. The SSCF chiller system also demonstrated higher exergy efficiency regardless of the number of SSCF chillers. The irreversibility of components in SSCF chillers was rather low. However, the irreversibility of the cooling tower and cooling coil was slightly higher and lower, respectively, than those in the parallel chiller system.
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Owen-Smith, Paul, John Wise, and Matthew J. Grieshop. "Season Long Pest Management Efficacy and Spray Characteristics of a Solid Set Canopy Delivery System in High Density Apples." Insects 10, no. 7 (June 29, 2019): 193. http://dx.doi.org/10.3390/insects10070193.

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Solid set canopy delivery systems (SSCDS) are a novel foliar agrochemical delivery system designed as an alternative for airblast sprayers in high density fruit production. This study tested the pest management potential, coverage, and chemical deposition of an SSCDS using commercially available microsprinkler components over the course of a growing season. Spray coverage and deposition for a representative airblast sprayer and SSCDS were evaluated using water sensitive paper and tartrazine dye, respectively. Foliar sprays for pest suppression were applied through both systems, and damage assessments were taken at the midpoint and end of the growing season. SSCDS sprays demonstrated similar levels of coverage on the adaxial leaf surface as airblast sprays, but significantly lower coverage on the abaxial surface. However, mean levels of foliar chemical deposition was generally higher in the SSCDS. Evaluations found minimal arthropod and fungal damage in both airblast and SSCDS treated plots compared to untreated trees. The SSCDS was shown to be a viable alternative to the airblast, with inherent advantages such as rapid application time and improved worker safety. Furthermore, higher deposition on SSCDS treated foliage supports the hypothesis that SSCDS provide a higher droplet capture rate in the canopy, with less off-target loss and drift than airblast sprayers.
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Baltis, Theodore, Douglas C. Hopkins, James M. Pitaressi, and Donald R. Hazelmyer. "High Thermal-Transient Packaging for a SiC-Based Solid State Circuit Breaker." International Symposium on Microelectronics 2011, no. 1 (January 1, 2011): 000608–18. http://dx.doi.org/10.4071/isom-2011-wa5-paper2.

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Solid-State Circuit Breakers (SSCBs), or Contactors, are critical components in next generation electric aircraft, and must be small in size, fast in response, and have high reliability. Silicon Carbide (SiC) semiconductor switches provide a series of improvements over traditional silicon-based breakers in both electrical and thermal performances. The reported SSCB uses SiC MOSFETs mounted on cast-aluminum traces, cast onto an aluminum nitride (AlN) ceramic co-captured in an aluminum composite baseplate. The system is similar to an AlSiC and Direct-Bonded-Aluminum (DBA) approach. This presentation details the transient thermal characterizations of an SSCB having the highest density in development. Previous work focused on a 30A SSCB that was constructed and tested to show a 300A, 500ns circuit breaking capability. The high density comes from allowing the SiC junctions to pulse to ∼350°C (in 5ms) from a 105°C ambient baseplate. The 30A/300A module was reported in IMAPS HiTEC’10 “Development of a SiC SSPC Module with Advanced High Temperature Packaging,” This paper builds on that paper adding the mechanical results and all new data on the larger, high energy density module with larger die. The objective of the presentation is to introduce (or update) the use of cast composite metal-ceramic structures for high thermal transient applications and document the mechanical stress/strain performance through simulations. The module is in development for military applications and has not been field-tested. This is also developed for Smart-Grid applications in local distribution systems.
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Dissertations / Theses on the topic "Systems and components (SSCs)"

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Yoon, Yong-Kyu. "Micromachined Components for RF Systems." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5264.

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Several fabrication techniques for surface micromachined 3-D structures have been developed for RF components. The fabrication techniques all have in common the use of epoxy patterning and subsequent metallization. Techniques and structures such as embedded conductors, epoxy-core conductors, a reverse-side exposure technique, a multi-exposure scheme, and inclined patterning are presented. The epoxy-core conductor technique makes it easy to fabricate high-aspect-ratio (10-20:1), tall (~1mm) RF subelements as well as potentially very complex structures by taking advantage of advanced epoxy processes. To demonstrate feasibility and usefulness of the developed fabrication techniques for RF applications, two test vehicles are employed. One is a solenoid type RF inductor, and the other is a millimeter wave radiating structure such as a W-band quarter-wavelength monopole antenna. The embedded inductor approach provides mechanical robustness and package compatibility as well as good electrical performance. An inductor with a peak Q-factor of 21 and an inductance of 2.6nH at 4.5GHz has been fabricated on a silicon substrate. In addition, successful integration with a CMOS power amplifier has been demonstrated. A high-aspect-ratio inductor fabricated using epoxy core conductors shows a maximum Q-factor of 84 and an inductance of 1.17nH at 2.6GHz on a glass substrate with a height of 900um and a single turn. Successful W-band monopole antenna fabrication is demonstrated. A monopole with a height of 800um shows its radiating resonance at 85GHz with a return loss of 16dB. In addition to the epoxy-based devices, an advanced tunable ferroelectric device architecture is introduced. This architecture enables a low-loss conductor device; a reduced intermodulation distortion (IMD) device; and a compact tunable LC module. A single-finger capacitor having a low-loss conductor with an electrode gap of 1.2um and an electrode thickness of 2.2um has been fabricated using a reverse-side exposure technique, showing a tunability of 33% at 10V. It shows an improved Q-factor of 21.5. Reduced IMD capacitors consist of wide RF gaps and narrowly spaced high resistivity electrodes with a gap of 2um and a width of 2um within the wide gap. A 14um gap and a 20um gap capacitor show improved IMD performance compared to a 4um gap capacitor by 6dB and 15dB, respectively, while the tunability is approximately 21% at 30V for all three devices due to the narrowly spaced multi-pair high resistivity DC electrodes within the gap. Finally, a compact tunable LC module is implemented by forming the narrow gap capacitor in an inductor shape. The resonance frequency of this device is variable as a function of DC bias and a frequency tunability of 1.1%/V is achieved. The RF components developed in this thesis illustrate the usefulness of the application of micromachining technology to this application area, especially as frequencies of operation of RF systems continue to increase (and therefore wavelengths continue to shrink).
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Motta, Enrico. "Reusable components for knowledge modelling." N.p, 1997. http://ethos.bl.uk/.

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Bouvier, Quentin. "Encapsulation of reactive components in polyurethane systems." Doctoral thesis, Universitat Rovira i Virgili, 2021. http://hdl.handle.net/10803/673183.

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Actualment els poliuretans s'utilitzen àmpliament en la indústria de recobriments i adhesius. Existeixen moltes tecnologies diferents per aplicar recobriments i adhesius sobre substrats i les tecnologies en les quals es pot controlar la reticulació o l'adhesió són de gran interès. De fet, això oferiria noves possibilitats per a sistemes complexos de recobriment/adhesiu. Amb aquesta finalitat, ja s'han desenvolupat reactius especials anomenats poliisocianats bloquejats; són derivats d'isocianats que només es poden activar mitjançant activador tèrmic. En un enfocament similar, l'encapsulació i l'alliberament controlat de components de formulació de poliuretà oferirà noves perspectives cap a tecnologies millorades. En primer lloc, en la present tesis, la encapsulació de catalitzadors basats en metalls en nanocàpsules de policaprolactona s'ha realitzat amb èxit mitjançant els mètodes de difusió de dissolvents d'emulsió i nanoprecipitació. S'ha obtingut una eficiència d'encapsulació millorada quan les nanocàpsules es carreguen amb una barreja de catalitzador i trioctanoat de gliceril, així com quan les nanocàpsules es sintetitzen amb superfícies exteriors carregades. La implementació d'aquestes nanocàpsules en recobriments de poliuretà demostra que són adequades per a la preparació de recobriments termosensibles. En segon lloc, s'ha aconseguit amb èxit l'encapsulació de poliisocianats, ja sigui en microcàpsules de poliuretà per policondensació interfacial, o en nanocàpsules de policaprolactona per nanoprecipitació. El procés d'encapsulació i l'estabilitat a llarg termini de les microcàpsules s'ha millorat molt treballant les propietats de l'embolcall de poliurea, però, les microcàpsules encara romanen fràgils amb el pas del temps i no es podrien utilitzar industrialment. La nanoencapsulació de poliisocianats ha mostrat que la reacció secundaria isocianat-aigua és especialment difícil d'evitar i suggereix que s'hauria d'investigar la tècnica d'encapsulació sense aigua, com ara la congelació d'esprai.
Actualmente los poliuretanos se utilizan ampliamente en la industria de recubrimientos y adhesivos. Existen muchas tecnologías distintas para aplicar recubrimientos y adhesivos sobre sustratos y las tecnologías en las que se puede controlar la reticulación o la adhesión son de gran interés. De hecho, esto ofrecería nuevas posibilidades para sistemas complejos de recubrimiento/adhesivo. A tal fin, ya se han desarrollado reactivos especiales llamados poliisocianatos bloqueados; son derivados de isocianatos que sólo pueden activarse mediante activador térmico. En un enfoque similar, la encapsulación y liberación controlada de componentes de formulación de poliuretano ofrecerá nuevas perspectivas hacia tecnologías mejoradas. En primer lugar, en la presente tesis, la encapsulación de catalizadores basados en metales en nanocápsulas de policaprolactona se ha realizado con éxito mediante los métodos de difusión de disolventes de emulsión y nanoprecipitación. Se ha obtenido una eficiencia de encapsulación mejorada cuando las nanocápsulas se cargan con una mezcla de catalizador y trioctanoato de glicerilo, así como cuando las nanocápsulas se sintetizan con superficies exteriores cargadas. La implementación de estas nanocápsulas en recubrimientos de poliuretano ha demostrado que son adecuadas para la preparación de recubrimientos termosensibles. En segundo lugar, se ha logrado con éxito la encapsulación de poliisocianatos, ya sea en microcápsulas de poliuretano por policondensación interfacial, o en nanocápsulas de policaprolactona por nanoprecipitación. El proceso de encapsulación y la estabilidad a largo plazo de las microcápsulas se ha mejorado mucho trabajando las propiedades de la envoltura de poliurea, sin embargo, las microcápsulas todavía permanecen frágiles con el paso del tiempo y no se podrían utilizar industrialmente. La nanoencapsulación de poliisocianatos ha mostrado que la reacción secundaria isocianato-agua es especialmente difícil de evitar y sugiere que debería investigarse la técnica de encapsulación sin agua, como la congelación de spray.
Nowadays polyurethanes are widely used in the coating and adhesive industry. Many different technologies exist to apply coatings and adhesives on substrates and technologies in which crosslinking or adhesion could be controlled are of greatest interest. Indeed, this would offer new possibilities for complex coating/adhesive systems. For this purpose, special reagents called blocked polyisocyanates have already been developed; they are derivatives of isocyanates which can only be activated via thermal trigger. In a similar approach, the encapsulation and controlled release of polyurethane formulation components would offer new perspectives toward enhanced technologies. First, the nanoencapsulation of metal-based catalysts into polycaprolactone nanocapsules was successfully performed by emulsion-solvent diffusion and nanoprecipitation. Improved encapsulation efficiency was obtained when the nanocapsules were loaded with a mixture of the catalyst and glyceryl trioctanoate, as well as when the nanocapsules were synthesized with charged outer surfaces. Implementation of these nanocapsules into polyurethane coatings showed that they are suitable for the preparation of thermoresponsive coatings. Then, the encapsulation of polyisocyanates was successfully achieved, either in polyurea microcapsules by interfacial polycondensation, or in polycaprolactone nanocapsules by nanoprecipitation. The encapsulation process and the long-term stability of the microcapsules was greatly improved by working on the polyurea shell properties, however, the microcapsules still remain fragile over time and could not be used industrially. The nanoencapsulation of polyisocyanates showed the isocyanate-water side-reaction is particularly challenging to avoid and it suggested that water-free encapsulation technique, such as spray congealing, should be investigated.
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Middendorf, John Raymond. "Novel Devices and Components for THz Systems." Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1400252710.

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Milovanovic, Ivan. "Components for area-efficient stormwater treatment systems." Licentiate thesis, Luleå tekniska universitet, Arkitektur och vatten, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-83877.

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Golish, Dathon R. "Quasioptical Systems & Components for Terahertz Astronomy." Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/195891.

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Over the past two decades, submillimeter and terahertz astronomy has grown rapidly and become an important new window for studying the universe. This growth has been enabled by the confluence of several technologies which make the design and fabrication of high frequency single and multi-pixel heterodyne receivers possible. This dissertation reviews the development of a new generation of terahertz instrumentation at the University of Arizona, with specific emphasis on their optical components and systems. These instruments include several receivers for the Antarctic Submillimeter Telescope and Remote Observatory (formerly installed at the South Pole), including a dual-frequency 492/810 GHz receiver called Wanda, a 4-pixel 810 GHz heterodyne array called PoleSTAR, and a 1.5 THz receiver called TREND. It also covers receivers for the Heinrich Hertz Submillimeter Telescope on Mt. Graham in southern Arizona. These receivers include a 7-pixel 345 GHz heterodyne array called DesertSTAR, a 64-pixel polarimeter/bolometer system called Hertz, and a 64-pixel 345 GHz heterodyne array called SuperCam. After reviewing these instruments, concepts for the next generation of arrays and terahertz telescopes designed for the high Atacama desert, Antarctica, high altitude balloon missions, and orbiting observatories will be presented. This dissertation will also cover other contributions made to terahertz astronomy, including the creation of a Gaussian beam propagation program to help design terahertz optical systems and an integrated optics design for a waveguide interferometer to be used as an alternative to traditional bulk optics systems.
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Martins, Helder Ricardo Laximi. "Distributed replicated macro-components." Master's thesis, Faculdade de Ciências e Tecnologia, 2013. http://hdl.handle.net/10362/10766.

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Dissertação para obtenção do Grau de Mestre em Engenharia Informática
In recent years, several approaches have been proposed for improving application performance on multi-core machines. However, exploring the power of multi-core processors remains complex for most programmers. A Macro-component is an abstraction that tries to tackle this problem by allowing to explore the power of multi-core machines without requiring changes in the programs. A Macro-component encapsulates several diverse implementations of the same specification. This allows to take the best performance of all operations and/or distribute load among replicas, while keeping contention and synchronization overhead to the minimum. In real-world applications, relying on only one server to provide a service leads to limited fault-tolerance and scalability. To address this problem, it is common to replicate services in multiple machines. This work addresses the problem os supporting such replication solution, while exploring the power of multi-core machines. To this end, we propose to support the replication of Macro-components in a cluster of machines. In this dissertation we present the design of a middleware solution for achieving such goal. Using the implemented replication middleware we have successfully deployed a replicated Macro-component of in-memory databases which are known to have scalability problems in multi-core machines. The proposed solution combines multi-master replication across nodes with primary-secondary replication within a node, where several instances of the database are running on a single machine. This approach deals with the lack of scalability of databases on multi-core systems while minimizing communication costs that ultimately results in an overall improvement of the services. Results show that the proposed solution is able to scale as the number of nodes and clients increases. It also shows that the solution is able to take advantage of multi-core architectures.
RepComp project (PTDC/EIAEIA/108963/2008)
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Wang, Kerwin. "Micro-optical components for a MEMS integrated display /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/6047.

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Stevens, Gary. "Fibre components and systems for mid-IR applications." Thesis, University of Glasgow, 2015. http://theses.gla.ac.uk/7290/.

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Fibre-optic components and systems are used in a wide variety of industrial, medical and communication applications and can be found in use everywhere in the modern world, from the bottom of the ocean to satellites in orbit. The field of fibre optics has seen rapid growth in the past few decades to become an essential enabling technology. However, much more work is needed to develop components and systems that can work at wavelengths in the short-wavelength infrared (SWIR)/mid-IR part of the spectrum (defined in this work as 1.5 – 4.5).
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Dardha, Ornela <1985&gt. "Type Systems for Distributed Programs: Components and Sessions." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amsdottorato.unibo.it/6441/.

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Modern software systems, in particular distributed ones, are everywhere around us and are at the basis of our everyday activities. Hence, guaranteeing their cor- rectness, consistency and safety is of paramount importance. Their complexity makes the verification of such properties a very challenging task. It is natural to expect that these systems are reliable and above all usable. i) In order to be reliable, compositional models of software systems need to account for consistent dynamic reconfiguration, i.e., changing at runtime the communication patterns of a program. ii) In order to be useful, compositional models of software systems need to account for interaction, which can be seen as communication patterns among components which collaborate together to achieve a common task. The aim of the Ph.D. was to develop powerful techniques based on formal methods for the verification of correctness, consistency and safety properties related to dynamic reconfiguration and communication in complex distributed systems. In particular, static analysis techniques based on types and type systems appeared to be an adequate methodology, considering their success in guaranteeing not only basic safety properties, but also more sophisticated ones like, deadlock or livelock freedom in a concurrent setting. The main contributions of this dissertation are twofold. i) On the components side: we design types and a type system for a concurrent object-oriented calculus to statically ensure consistency of dynamic reconfigurations related to modifications of communication patterns in a program during execution time. ii) On the communication side: we study advanced safety properties related to communication in complex distributed systems like deadlock-freedom, livelock- freedom and progress. Most importantly, we exploit an encoding of types and terms of a typical distributed language, session π-calculus, into the standard typed π- calculus, in order to understand their expressive power.
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Books on the topic "Systems and components (SSCs)"

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Birmingham), Autotech 1991 (1991. Mechanical components and systems. London: Institution of Mechanical Engineers, 1991.

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Aircraft systems and components. Casper, WY: IAP, Inc., 1992.

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Microwave components and systems. Wokingham, England: Addison-Wesley, 1987.

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Carstens, James R. Automatic control systems and components. Englewood Cliffs, N.J: Prentice Hall, 1990.

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Valve train: Systems and components. Stuttgart: Springer Vieweg, 2013.

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Reussner, Ralf H., Judith A. Stafford, and Clemens A. Szyperski, eds. Architecting Systems with Trustworthy Components. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11786160.

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J, Hoogendoorn Charles, and Kreith Frank, eds. Solar design: Components, systems, economics. New York: Hemisphere Pub. Corp., 1989.

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Scott, Hissam, and Seacord Robert C, eds. Building systems from commercial components. Boston: Addison-Wesley, 2002.

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Bath International Fluid Power Workshop (2nd 1989 University of Bath). Fluid power components and systems. Taunton, Somerset, England: Research Studies Press, 1990.

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Abuhelgha, Mohammed Ibrahim. Mining legacy systems for reusable components. Leicester: De Montfort University, 2002.

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Book chapters on the topic "Systems and components (SSCs)"

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Simmons, Jonathon Y. "A Practical Systems Engineering Process for Integrating SSC Collider Ring Components." In Supercollider 3, 1099–108. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-3746-5_101.

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Semenov, Andrey B., Stanislav K. Strizhakov, and Igor R. Suncheley. "Auxiliary Components." In Structured Cable Systems, 251–94. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-10124-7_5.

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Gicquel, Renaud. "Steam systems components." In Energy Systems, 121–44. 2nd ed. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003175629-7.

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Abou Jieb, Yaman, and Eklas Hossain. "Solar System Components." In Photovoltaic Systems, 95–192. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-89780-2_5.

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Gross, Herbert. "Special Components." In Handbook of Optical Systems, 693–757. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2015. http://dx.doi.org/10.1002/9783527699223.ch15.

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Greenwood, Nigel R. "The Components." In Implementing Flexible Manufacturing Systems, 81–92. London: Macmillan Education UK, 1988. http://dx.doi.org/10.1007/978-1-349-07959-9_4.

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Raizer, Vladimir, and Isaac Elishakoff. "Systems and Components." In Philosophies of Structural Safety and Reliability, 119–37. New York: CRC Press, 2022. http://dx.doi.org/10.1201/9781003265993-7.

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Donald B., Corner, and John Rowell. "Components and Systems." In Architectural Terra Cotta, 102–204. New York: Routledge, 2022. http://dx.doi.org/10.4324/9780429057915-7.

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Ng, Tian Seng. "Vehicle Components." In Robotic Vehicles: Systems and Technology, 35–42. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6687-9_5.

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Semenov, Andrey B., Stanislav K. Strizhakov, and Igor R. Suncheley. "SCS Electrical Components." In Structured Cable Systems, 81–184. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-10124-7_3.

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Conference papers on the topic "Systems and components (SSCs)"

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Florescu, Gheorghe, and Mihail Cojan. "Identification of CSSC Caused by Ageing and Degradation." In 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/icone14-89286.

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PSA studies, that were developed for some NPPs, permit the using of the created models to perform many research tests, in order to optimize the structures, systems and components (SSCs) operation or to identify the NPP or systems weaknesses, due to specific or special factors. SSCs that influence decisively the NPP reliability are considered as critical. Also, for the accident conditions, the SSC, which have a major influence to the system availability or operability, are considered as critical. Many worldwide NPPs reached the life time or are very close to do that. Several SSCs have shorter life times than NPP’s life time. Ageing is one of the factors that decrease the SSC life time. Due to ageing, if are not replaced, some SSCs, or groups of redundant SSCs, become critical looking to safety. Some questions for what to do in the situation when a SSC must be replaced and the SSC specific manufacturer doesn’t exist, could also be put. The paper tried to solve the problem of SSC modeling by introducing of an ageing factor in SSC model. Fault tree (F/T) modeling approach is assumed. There are two possibilities for modeling: failure rates that are changed or specific MCS (minimal cut set) term modified by ageing. Risk analysis and PSA techniques are used as a basis for analysis. The paper includes: the steps to establish the systems or components that suffer ageing; methods to identify CSSC taking into account ageing; the events associated to ageing/degradation and presentation of method to determine the ageing related events, selection of the SSCs that are important for analyses; selection of the most significant ageing events; ranking of ageing events; association of events to these components in order to decide for the CSSC detailed analyses; ranking / ordering of the ageing related events; optimization of NPP systems design and operation considering ageing; impact of ageing to NPP operation/safety/safety margins and to manufacturer technical specifications. The paper presents a brief description of the most important aspects of the methods, used to analyze the ageing effects on appearing of CSSCs, taking into account the previous developed NPP PSA models and PSA modeling tools.
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Imbro, Eugene, and Thomas G. Scarbrough. "Incorporation of Risk Insights in the Regulatory Treatment of Nuclear Power Plant Structures, Systems, and Components." In 10th International Conference on Nuclear Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/icone10-22658.

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The U.S. Nuclear Regulatory Commission (NRC) has established an initiative to risk-inform the requirements in Title 10 of the Code of Federal Regulations (10 CFR) for the regulatory treatment of structures, systems, and components (SSCs) used in commercial nuclear power plants. As discussed in several Commission papers (e.g., SECY-99-256 and SECY-00-0194), Option 2 of this initiative involves categorizing plant SSCs based on their safety significance, and specifying treatment that would provide an appropriate level of confidence in the capability of those SSCs to perform their design functions in accordance with their risk categorization. The NRC has initiated a rulemaking effort to allow licensees of nuclear power plants in the United States to implement the Option 2 approach in lieu of the “special treatment requirements” of the NRC regulations. In a proof-of-concept effort, the NRC recently granted exemptions from the special treatment requirements for safety-related SSCs categorized as having low risk significance by the licensee of the South Texas Project (STP) Units 1 and 2 nuclear power plant, based on a review of the licensee’s high-level objectives of the planned treatment for safety-related and high-risk nonsafety-related SSCs. This paper discusses the NRC staff’s views regarding the treatment of SSCs at STP described by the licensee in its updated Final Safety Analysis Report (FSAR) in support of the exemption request, and provides the status of rulemaking that would incorporate risk insights into the treatment of SSCs at nuclear power plants.
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Meyer, Theodore A., G. Gary Elder, and Ricardo Llovet. "Life Cycle Management: Managing the Aging of Critical Nuclear Plant Components." In 10th International Conference on Nuclear Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/icone10-22536.

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Life Cycle Management is a structured process to manage equipment aging and long-term equipment reliability for nuclear plant Systems, Structures and Components (SSCs). The process enables the identification of effective repair, replace, inspect, test and maintenance activities and the optimal timing of the activities to maximize the economic value to the nuclear plant. This paper will provide an overview of the process and some of the tools that can be used to implement the process for the SSCs deemed critical to plant safety and performance objectives. As nuclear plants strive to reduce costs, extend life and maximize revenue, the LCM process and the supporting tools summarized in this paper can enable development of a long term, cost efficient plan to manage the aging of the plant SSCs.
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Balls, Vondell J., David S. Duncan, and Stephanie L. Austad. "The Component Test Facility: A National User Facility for Testing of High Temperature Gas-Cooled Reactor (HTGR) Components and Systems." In Fourth International Topical Meeting on High Temperature Reactor Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/htr2008-58250.

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The Next Generation Nuclear Plant (NGNP) and other High-Temperature Gas-cooled Reactor (HTGR) Projects require research, development, design, construction, and operation of a nuclear plant intended for both high-efficiency electricity production and high-temperature industrial applications, including hydrogen production. During the life cycle stages of an HTGR, plant systems, structures and components (SSCs) will be developed to support this reactor technology. To mitigate technical, schedule, and project risk associated with development of these SSCs, a large-scale test facility is required to support design verification and qualification prior to operational implementation. As a full-scale helium test facility, the Component Test facility (CTF) will provide prototype testing and qualification of heat transfer system components (e.g., Intermediate Heat Exchanger, valves, hot gas ducts), reactor internals, and hydrogen generation processing. It will perform confirmation tests for large-scale effects, validate component performance requirements, perform transient effects tests, and provide production demonstration of hydrogen and other high-temperature applications. Sponsored wholly or in part by the U.S. Department of Energy, the CTF will support NGNP and will also act as a National User Facility to support worldwide development of High-Temperature Gas-cooled Reactor technologies.
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Zeng, Wei, and Hongxing Yu. "On the Use of Binary Importance Decision for Risk-Informed Categorization of SSCs." In 17th International Conference on Nuclear Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/icone17-75071.

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The categorization of Structures, Systems and Components (SSCs) is one of the foundations in the design of the nuclear reactor. The regulation requirements based on the current deterministic categorization are over-conservative in some aspects; on the other hand, some requirements for the nonsafety-related components are too loose. In order to make the requirements reasonable, the risk-informed significance categorization of SSCs has been presented. Risk-informed significance categorization (RISC) is to categorize structures, systems, or components (SSCs) of a nuclear power plant (NPP) into two or more groups, according to their significance using both probabilistic and deterministic insights. The SSCs are quantitatively categorized by their importance measures; Fussell–Vesely (FV) and Risk Achievement Worth (RAW) are widely used. But in conventional methods for the RISC, first, a component will be categorized as significance once the value of FV or RAW is over the thresholds. So the significant components are treated equally regardless of the difference between FV and RAW, that is not suitable. Second, the component RAW derived from the sum or maximum of the basic events is not realistic. Third, the categorization threshold for FV is not uniform, different reactors have the different thresholds. The three key problems will be researched in this paper, the quartered way will be presented base on the discussion about combination of the two importance measures (binary importance decision). And then through transferring the additivity from FV to RAW, the realistic component RAW derived from FV will be got. Finally, according to the relationship between FV and RAW, the threshold for FV will be gained similar to RAW. In the study, the author will use the new method to make a practice on the Daya Bay Nuclear Power Plant, 43% components of the low pressure safety injection system which are safety-related are categorized as low significant; 2.6% components which are nonsafety-related of the auxiliary feed water system are categorized as significant.
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Wang, Congjian, Diego Mandelli, Shawn St Germain, Curtis Smith, David Morton, Ivilina Popova, and Stephen Hess. "Stochastic Optimization for Long Term Capital Structures, Systems, and Components Refurbishment and Replacement." In ASME 2020 Power Conference collocated with the 2020 International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/power2020-16195.

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Abstract As commercial nuclear power plants (NPPs) pursue extended plant operations in the form of Second License Renewals (SLRs), opportunities exist for these plants to provide capital investments to ensure long-term, safe, and economic performance. Several utilities have already announced their intention to pursue extended operations for one or more of their NPPs via SLR2. The goal of this research is to develop a risk-informed approach to evaluate and prioritize plant capital investments made in preparation for, and during the period of, extended plant operations to support decisions in NPP operations. In order to prioritize project selection via a risk-informed approach we developed a single decision-making tool that integrates safety/reliability, cost, and stochastic optimization models to provide users with data analysis capabilities to more cost effectively manage plant assets. Both stochastic analysis methods — such as Monte Carlo-based sampling strategies — and multi-stage stochastic optimization strategies are employed to provide priority lists to decision-makers in support of risk-informed decisions. We applied the proposed method to a trial application of projected replacement/refurbishment expenditures for plant capital assets (i.e., structures, systems, and components [SSCs]). The objective is to optimize the SSC replacement/refurbishment schedule in terms of economic constraints, data uncertainties, and SSC reliability data, as well to generate a priority list for maximizing returns on investment.
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Jing, Zhou, Ran Wen Wang, Gong Quan, and Lv Wei Feng. "Assessment and Control Value Formulation on Radiological Consequence of On-Site Worker due to Radioactive Component Failure for Pressurized Water Reactor Plant." In 2022 29th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/icone29-91624.

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Abstract All Structures, Systems, and Components (SSCs) in a nuclear power plant need to be classified according to their importance to safety to protect people and the environment. The Specific Safety Guide, No. SSG-30, issued by IAEA, guides how to meet the requirements for identifying safety functions and classification of SSCs and ensuring their appropriate quality and reliability. However, the relevant guidance has not specified the perspectives of low radiological consequences on on-site workers. To refine the SSCs classification and complement the IAEA guidance, a proposed limiting value and corresponding assessment method for low radiological consequence caused by SSCs failure from the on-site workers’ perspective based on international good practices are developed, which include the main process of on-site radiological consequence evaluation, the calculation method for different exposure pathways and the assessment assumptions. Also, typical examples of SSCs failure are also assessed to validate the proposed method’s feasibility. The assessment results show that the activity concentration of failure SSCs, the workers’ locations, the exposure duration of workers, and the local dose rate of each location are the main factors for on-site radiological consequence evaluation, and the proposed method in this paper can assist in the safety classification of SSCs in the third generation of pressurized water reactor nuclear power plants.
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Heymer, Adrian P. "Risk-Informing: The SSC Scope of U.S. NRC Special Treatment Requirements – Treatment of Low Safety-Significant SSCs." In 10th International Conference on Nuclear Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/icone10-22788.

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This paper provides a general description and rationale for licensee-established industrial controls for structures, systems and components (SSCs) that have been categorized as low safety-significant through a process consistent with 10 CFR 50.69 requirements.
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Rothenho¨fer, Horst, Friedrich Scho¨ckle, and Gu¨nter Ko¨nig. "How a Knowledge Data Base Assists the Process of Aging Management." In ASME 2011 Pressure Vessels and Piping Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/pvp2011-57895.

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The process of aging management in a nuclear power plant requires collaborative work of different departments. In this process information has to be gathered and evaluated systematically. At the beginning of the process it is important to classify all systems, structures and components (SSCs) into 3 categories of descending importance concerning safety where only the first two categories have to be considered for aging management. Basic information on the material and dimensions, operational parameters, quality status, analysis reports and relevant degradation mechanisms is stored in the data base for all SSCs of category 1 and 2. While a nuclear power plant is in service numerous events may occur which are related to aging and may have an influence on the quality of SSCs. Relevant events may be malfunction messages, maintenance results, operational experience, results of surveillance or events in external installations. It is important to evaluate these events concerning the aspect of aging and to decide which measures are required to prevent unexpected events of the same kind in the future. In some cases the new experience has to be assigned to comparable SSCs. These evaluations, the definition of measures and the tracking of their effectiveness have to be done by an aging management team that meets regularly every 3 months. The knowledge data base supports the application of the PDCA cycle and provides an overview and fast access to all quality documents related to each SSC including surveillance measures and results. It simplifies the generation of annual status reports which are valuable quality documents that reveal the effectiveness of aging management. Finally the procedure can be extended to SSCs which are important for the availability of the plant and thus take a step forward from aging management to plant life management.
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Johnson, B. C., and G. E. Apostolakis. "The Limit Exceedance Factor Importance Measure: An Application to the Prism Reactor Design." In 17th International Conference on Nuclear Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/icone17-75128.

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Probabilistic Risk Assessment has several different standard importance measures for structures, systems, and components (SSCs). These importance measures are Risk Achievement Worth (RAW), Risk Reduction Worth (RRW), and Fussell-Vesely (FV). In particular, RAW and FV have been used to identify SSCs of low risk significance. However, when designing a conceptual reactor with a safety goal in mind such as those proposed in various technology neutral frameworks, these importance measures are quite crude. RAW is defined such that a component is always in the failed state, and a designer may not be looking to remove a system but to simplify it to improve economics. The Limit Exceedance Factor has been developed as a more informative importance measure when there is a goal in mind. It is defined as the factor by which the failure probability of a component may be multiplied by such that the end state (e.g. core damage) frequency exceeds a limit. With a living PRA available throughout the design process, it could allow a designer to know how much room there is for possible simplification in redundant systems. Alternatively, in the case where a system does not meet the frequency limit it can show which systems might be ideal targets for improvement to reach the limit. For a sodium-cooled fast reactor design, using the goals and limits outlined in NUREG-1860 (Technology Neutral Framework), one end state that must stay below a threshold is a very large release due to an energetic scenario. Several SSCs can be identified as risk insignificant with RAW values below two. The other SSCs tend to have very high RAW values on the order of one thousand. When the LEF is applied to the SSCs that seem to be very important using traditional importance measures, we see that some may actually have a fairly wide margin from their cited failure probabilities and still maintain the frequency goal.
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Reports on the topic "Systems and components (SSCs)"

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Ross, Sheldon, and Babak Haji. Modeling Systems of Dependent Components. Fort Belvoir, VA: Defense Technical Information Center, September 2014. http://dx.doi.org/10.21236/ada617662.

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Hall, R., and J. Sharp. Integration of information systems components. Office of Scientific and Technical Information (OSTI), April 1990. http://dx.doi.org/10.2172/6895487.

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Paulsen, Celia, Jon Boyens, Nadya Bartol, and Kris Winkler. Criticality analysis process model: prioritizing systems and components. Gaithersburg, MD: National Institute of Standards and Technology, April 2018. http://dx.doi.org/10.6028/nist.ir.8179.

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Nantista, Christopher D. Active and Passive RF Components for High-Power Systems. Office of Scientific and Technical Information (OSTI), September 2002. http://dx.doi.org/10.2172/812624.

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Bailey, W. J., and F. M. Berting. Integrity of neutron-absorbing components of LWR fuel systems. Office of Scientific and Technical Information (OSTI), March 1991. http://dx.doi.org/10.2172/5980553.

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I. Cuesta. Design-Load Basis for LANL Structures, Systems, and Components. Office of Scientific and Technical Information (OSTI), September 2004. http://dx.doi.org/10.2172/835892.

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Feddema, J. T., R. Simon, M. Polosky, and T. Christenson. Ultra-Precise Assembly of Micro-Electromechanical Systems (MEMS) Components. Office of Scientific and Technical Information (OSTI), April 1999. http://dx.doi.org/10.2172/5833.

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Glandt, E. Thermodynamics of systems with very many components phase equilibrium. Office of Scientific and Technical Information (OSTI), October 1989. http://dx.doi.org/10.2172/7167377.

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Gopala N. Krishnan, Ripudaman Malhotra, Esperanza Alvarez, Kai-Hung Lau, Jordi Perez-Mariano, and Angel Sanjurjo. Diffusion Coatings for Corrosion-Resistant Components in Coal Gasification Systems. Office of Scientific and Technical Information (OSTI), December 2006. http://dx.doi.org/10.2172/901148.

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Gopala N. Krishnan, Ripudaman Malhotra, Esperanza Alvarez, Kai-Hung Lau, Jordi Perez-Mariano, and Angel Sanjurjo. Diffusion Coatings for Corrosion-Resistant Components in Coal Gasification Systems. Office of Scientific and Technical Information (OSTI), March 2007. http://dx.doi.org/10.2172/909178.

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