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Academic literature on the topic 'MSR Code Construction'

Author: Grafiati

Published: 6 September 2023

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Journal articles on the topic "MSR Code Construction"

1

Xiao, Chuqiao, Xueqing Gong, Yefeng Xia, and Qian Zhang. "PB: A Product-Bitmatrix Construction to Reduce the Complexity of XOR Operations of PM-MSR and PM-MBR Codes over GF 2 w." Security and Communication Networks 2021 (January 29, 2021): 1–18. http://dx.doi.org/10.1155/2021/6642121.

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Edge computing, as an emerging computing paradigm, aims to reduce network bandwidth transmission overhead while storing and processing data on edge nodes. However, the storage strategies required for edge nodes are different from those for existing data centers. Erasure code (EC) strategies have been applied in some decentralized storage systems to ensure the privacy and security of data storage. Product-matrix (PM) regenerating codes (RGCs) as a state-of-the-art EC family are designed to minimize the repair bandwidth overhead or minimize the storage overhead. Nevertheless, the high complexity of the PM framework contains more finite-domain multiplication operations than classical ECs, which heavily consumes computational resources at the edge nodes. In this paper, a theoretical derivation of each step of the PM minimum storage regeneration (PM-MSR) and PM minimum bandwidth regeneration (PM-MBR) codes is performed and the XOR complexity over finite fields is analyzed. On this basis, a new construct called product bitmatrix (PB) is designed to reduce the complexity of XOR operations in the PM framework, and two heuristics are used to further reduce the XOR numbers of the PB-MSR and PB-MBR codes, respectively. The evaluation results show that the PB construction significantly reduces the XOR number compared to the PM-MSR, PM-MBR, Reed–Solomon (RS), and Cauchy RS codes while retaining optimal performance and reliability.

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Bei, Xinyan, Yuqing Dai, Kaicheng Yu, and Maosong Cheng. "Three-Dimensional Surrogate Model Based on Back-Propagation Neural Network for Key Neutronics Parameters Prediction in Molten Salt Reactor." Energies 16, no. 10 (May 12, 2023): 4044. http://dx.doi.org/10.3390/en16104044.

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The simulation and analysis of neutronics parameters in Molten Salt Reactors (MSRs) is fundamental for the design of the reactor core. However, high-fidelity neutron transport calculations of the MSR are time-consuming and require significant computational resources. Artificial neural networks (ANNs) have been used in various industries, and in recent years are increasingly introduced in the nuclear industry. Back-Propagation neural network (BPNN) is one type of ANN. A surrogate model based on BP neural network is developed to quickly predict two key neutronics parameters in reactor core: the effective multiplication factor (keff) and the three-dimensional channel-by-channel neutron flux distribution. The dataset samples are generated by modeling and simulating different operation states of the Molten Salt Reactor Experiment (MSRE) using the Monte Carlo code. Hyper-parameters optimization is performed to obtain the optimal surrogate model. The numerical results on the test dataset show good agreement between the surrogate model and the Monte Carlo code. Additionally, the surrogate model significantly reduces computation time compared to the Monte Carlo code and greatly enhances efficiency. The feasibility and advantages of the proposed surrogate model is demonstrated, which has important significance for real-time prediction and design optimization of the reactor core.

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Yu, Kaicheng, Maosong Cheng, Xiandi Zuo, and Zhimin Dai. "Transmutation and Breeding Performance Analysis of Molten Chloride Salt Fast Reactor Using a Fuel Management Code with Nodal Expansion Method." Energies 15, no. 17 (August 29, 2022): 6299. http://dx.doi.org/10.3390/en15176299.

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The transmutation of transuranic (TRU) elements produced by pressurized water reactors (PWRs) can effectively reduce their radioactive hazards. The molten chloride salt fast reactor (MCSFR) is a type of liquid-fueled molten salt reactor (MSR) using fuel in the form of molten chloride salts. The MCSFR utilizing a fast neutron spectrum and high actinide fraction is considered to be a potential reactor type for TRU transmutation. An online refueling and reprocessing scenario is the unique feature of liquid-fueled MSRs. On account of this characteristic, a new fuel management code named ThorNEMFM with a nodal expansion method (NEM) was developed and validated with the molten salt breeder reactor (MSBR) and the molten salt fast reactor (MSFR) benchmarks. Then, the transmutation and breeding performances of the MCSFR were simulated and analyzed with the ThorNEMFM code. The MCSFR adopts TRU elements as initial fissile loads and online feeding fissile materials. The results show that the transmutation ratio of TRU elements in the MCSFR can reach 50%, and the breeding ratio can reach 1.359. Moreover, the MCSFR has low radiotoxicity due to lower buildup of fission products (FPs).

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Rashmi, K. V., Nihar B. Shah, and P. Vijay Kumar. "Optimal Exact-Regenerating Codes for Distributed Storage at the MSR and MBR Points via a Product-Matrix Construction." IEEE Transactions on Information Theory 57, no. 8 (August 2011): 5227–39. http://dx.doi.org/10.1109/tit.2011.2159049.

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Payne, Dinah M., Christy Corey, Cecily Raiborn, and Matthew Zingoni. "An applied code of ethics model for decision-making in the accounting profession." Management Research Review 43, no. 9 (April 26, 2019): 1117–34. http://dx.doi.org/10.1108/mrr-10-2018-0380.

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Purpose The purpose of paper is to supply a code of ethics that can be easily utilized by working professional in their day to day decision making. The accounting profession plays a vital role in the functioning of modern society. It is essential that members of this profession be ethical and stand fast against the internal and external pressures that might encourage these professionals to engage in fraudulent activities. Codes of ethics provide a coherent articulation of the ideals, responsibilities and limitations of the collective ethic of a profession’s members and can assist in guiding ethical behavior. Design/methodology/approach Our model is based on the professional values of justice, utility, competence and utility, i.e. JUCI model, which is a straightforward and easily understandable ethical decision-making model that the average accounting professional, as well as finance professionals in general, may reference when challenged with difficult ethical quandaries. Findings This code, the JUCI Code, represents a contribution to the literature in that its simple, but not simplistic, approach could be of enormous benefit to busy and pressured accountants who need help in constructing independently achieved and defensible rational ethical decisions in the practice of accounting. Originality/value In this paper, the authors build upon a review of ethical foundations and codes of conduct in other professions to construct our code of ethics for accounting professionals.

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Guan, Sheng, Haibin Kan, Jie Wen, and Shuli Xia. "A New Construction of Exact-Repair MSR Codes Using Linearly Dependent Vectors." IEEE Communications Letters 21, no. 8 (August 2017): 1691–94. http://dx.doi.org/10.1109/lcomm.2017.2700862.

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Liang, Songtao, Chen Yuan, and Haibin Kan. "Linear Exact-Repair Construction of Hybrid MSR Codes in Distributed Storage Systems." IEEE Communications Letters 18, no. 7 (July 2014): 1095–98. http://dx.doi.org/10.1109/lcomm.2014.2323309.

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Martinez, Philippe Antoine. "A quaternary epistemic code." Linguistics of the Tibeto-Burman Area 46, no. 1 (May 12, 2023): 35–71. http://dx.doi.org/10.1075/ltba.22008.mar.

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Abstract Evidentiality has often been described in narrow terms as an independent grammatical category denoting an overt source of information (e.g., perception, inference, assumption and hearsay). Drawing on fieldwork data, this paper explores how evidentiality is encoded at the copula level in Chhitkul-Rākchham (West Himalayish). In doing so, it is argued that the relevant evidentials, part of a comparatively complex scheme consisting of nine elements, together with a negative sub-system, fall under the broader umbrella of epistemic modality. The contention finds an illustration in an egophoric marker following two inflectional tracks with two resulting degrees of assertiveness, and in a handful of combinatorial constructions. Evidentiality as expressed by copulas points to the self, which builds bridges with the study of consciousness. The latter term is underappreciated within linguistics and this work emphasizes the need for a broader cross-disciplinary outlook.

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Ye, Min. "New Constructions of Cooperative MSR Codes: Reducing Node Size to exp(O(n))." IEEE Transactions on Information Theory 66, no. 12 (December 2020): 7457–64. http://dx.doi.org/10.1109/tit.2020.3008342.

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Wilson, Eric, Phalguni Mukhopadhyaya, Kevin Pickwick, and Terry Bergen. "A reality based cost-benefit analysis of high performance residences: Part II." Canadian Journal of Civil Engineering 47, no. 5 (May 2020): 630–49. http://dx.doi.org/10.1139/cjce-2018-0572.

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This research initiative attempts to determine, from real construction cost estimates, the cost challenge and expected payback period associated with building a high-performance residence in Victoria, BC. This was accomplished through: a simulated tendering process with local contractors, an energy analysis of a case-study residence (Part I of this research initiative), and an in-depth study into the variables governing time-to-amortization. The contractors provided quotes for an as-built “above code” residence (ACR), and a “minimum-code” residence (MCR) with the same floor plan (Note: The as-built above-code residence was not built or designed to any specific performance standard; however, it was found in Part I of this research initiative that when compared to the new BC Step code that it performed at a step 3 designation, bordering on step 4 performance). The results of the tendering process were then compared to the as-built construction costs of the residence. When compared to the MCR, it was found that the ACR has a cost challenge of approximately 22.5%, an energy advantage of 22.5 kWh/m2/year, and a payback period of over 79 years when a fuel inflation rate of 2% is considered. However, many of the components in the ACR assemblies were either for aesthetic appeal (metal-roofing), or comfort (floor-cavity insulation), and therefore it was possible to reduce the cost challenge to just 2.1%, while maintaining an energy advantage of 15 kWh/m2/year and step level 3 designation. This was dubbed the hybrid-residence as it employed a combination of above-code and minimum-code construction assemblies. Based on a simple mortgage increase calculation, it was found that the reduction in operational costs produced by the energy-efficiency measures for this residence services 87% of the mortgage increase taken on by the home buyer.

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Books on the topic "MSR Code Construction"

1

Office, Great Britain Foreign and Commonwealth. 1994 Amendments to the International Code for the Construction and Equipment of Ships Carrying liquefied Gases in Bulk (IGC Code), (Resolution MSC.32 (63)). London: Stationery Office, 1999.

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Great Britain. Foreign and Commonwealth Office. 1992 amendments to the International Code for the Construction and Equipment of Ships Carrying liquefied Gases in Bulk (IGC Code), (Resolution MSC.30 (61)). London: Stationery Office, 1999.

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Organization, International Maritime, ed. International code for the construction and equipment of ships carrying dangerous chemicals in bulk (IBC Code): Supplement : Amendments adopted by resolutions MSC.50(66), MSC.58(67), MEPC.68(38) and MEPC.73(39). London: International Maritime Organization, 1997.

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International Maritime Organization. Maritime Safety Committee. and International Maritime Organization. Marine Environment Protection Committee., eds. International code for the construction and equipment of ships carrying dangerous chemicals in bulk (IBC code): Resolution MSC.4(48) including proposed amendments and Resolution MEPC.19(22). 2nd ed. London: IMO, 1986.

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Organization, International Maritime, ed. Code for the construction and equipment of ships carrying dangerous chemicals in bulk (BCH Code): Resolution MEPC.20(22), as amended by resolution MEPC.33(27) and resolution MSC.9(53), as amended by resolution MSC.15(57). 6th ed. London: IMO, 1990.

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Organization, International Maritime, ed. International code for the construction and equipment of ships carrying dangerous chemicals in bulk (IBC code): Resolution MSC.4(48) including amendments adopted by resolutions MSC.10(54), MSC.14(57) and MSC.28(61) and Resolution MEPC.19(22) including amendments adopted by resolutions MEPC.32(27) and MEPC.55(33) and index of dangerous chemicals carried in bulk. London: International Maritime Organization, 1994.

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Canada. Dept. of Foreign Affairs and International Trade. Navigation : 1996 amendments to the International Code for the Construction and Equipment of Ships Carrying Dangerous Chemicals in Bulk (IBC CODE) (Resolution MSC. 58 (67)), London, December 5, 1996, tacit acceptance by all parties January 1, 1998, in force July 1, 1998, in force for Canada July 1, 1998 =: Navigation : amendements de 1996 au recueil international de règles relatives à la construction et à l'équipement des navires transportant des produits chimiques dangereux en vrac (RECUEIL IBC) Résolution MSC. 58 (67)), Londres, le 5 décembre 1996, acceptation tacite des parties le 1er janvier, 1998, en vigueur le 1er juillet 1998, en vigueur pour le Canada le 1er juillet 1998. Ottawa, Ont: Minister of Public Works and Government Services Canada = Ministre des travaux publics et services gouvernementaux Canada, 1998.

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Canada. Dept. of Foreign Affairs and International Trade. Navigation : 1996 amendments to the International Code for the Construction and Equipment of Ships Carrying Liquified Gases in Bulk (IGC CODE) (Resolution MSC. 59 (67)), London, December 5, 1996, tacit acceptance by all parties January 1, 1998, in force July 1, 1998, in force for Canada July 1, 1998 =: Navigation : amendements de 1996 au recueil international des règles relatives à la construction et à l'équipement des navires transportant des gaz liquifiés en vrac (RECUEIL IGC) (Résolution MSC. 59 (67)), Londres, le 5 décembre 1996, acceptation tacite des parties le 1er janvier, 1998, en vigueur le 1er juillet 1998, en vigueur pour le Canada le 1er juillet 1998. Ottawa, Ont: Minister of Public Works and Government Services Canada = Ministre des travaux publics et services gouvernementaux Canada, 1998.

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Code for the construction and equipment of ships carrying dangerous chemicals in bulk (BCH Code): Resolution MEPC. 20(22) and resolution MSC.9(53). 5th ed. London: IMO, 1986.

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Gertwagen, Ruth. Fiscal and Technical Limitations on Venetian Military Engineering in the Stato da Mar in the Fourteenth and Fifteenth Centuries. Edinburgh University Press, 2018. http://dx.doi.org/10.3366/edinburgh/9781845861209.003.0007.

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The Venetian overseas empire followed the Fourth Crusade when Venice shared the partition of the Eastern Roman Empire. She bought the island of Crete, to keep it out of the hands of the rival Genoese. The latter remained the main naval rival of Venice to the start of the fifteenth century. There was no automatic fortification of harbours or construction of artificial fortified harbours, except in Candia in Crete and Methoni in the Peloponnese, despite the shortage of natural harbours and the challenge of the Ottoman , mainly because of fiscal problems. Fortification did come after 1600, but was late and ineffectual.

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Book chapters on the topic "MSR Code Construction"

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Mohan, Anshuman, Wei Xiang Leow, and Aquinas Hobor. "Functional Correctness of C Implementations of Dijkstra’s, Kruskal’s, and Prim’s Algorithms." In Computer Aided Verification, 801–26. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-81688-9_37.

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AbstractWe develop machine-checked verifications of the full functional correctness of C implementations of the eponymous graph algorithms of Dijkstra, Kruskal, and Prim. We extend Wang et al.’s CertiGraph platform to reason about labels on edges, undirected graphs, and common spatial representations of edge-labeled graphs such as adjacency matrices and edge lists. We certify binary heaps, including Floyd’s bottom-up heap construction, heapsort, and increase/decrease priority.Our verifications uncover subtle overflows implicit in standard textbook code, including a nontrivial bound on edge weights necessary to execute Dijkstra’s algorithm; we show that the intuitive guess fails and provide a workable refinement. We observe that the common notion that Prim’s algorithm requires a connected graph is wrong: we verify that a standard textbook implementation of Prim’s algorithm can compute minimum spanning forests without finding components first. Our verification of Kruskal’s algorithm reasons about two graphs simultaneously: the undirected graph undergoing MSF construction, and the directed graph representing the forest inside union-find. Our binary heap verification exposes precise bounds for the heap to operate correctly, avoids a subtle overflow error, and shows how to recycle keys to avoid overflow.

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Mohd Nazri Wan Abdul Rahman, Wan, Nur Sakinah Mohamed Tamat, Nor Yuziah Mohd Yunus, and Jamaludin Kasim. "Size Effect of Core Strands on the Major Physical and Mechanical Properties of Oriented Strand Boards from Fast Growing Tropical Species." In Engineered Wood Products for Construction [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.99953.

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Oriented strand board (OSB) is generally used for sheathing in residential walls, floors, and roofs. Because of its low pricing and utilisation of tiny diameter logs from fast-growing trees and thinning logs as raw materials, OSB is anticipated to gain popularity. In chapter, board properties of OSB using smaller strand size of Leucaena leucocephala as core layer had been studied. Small strand size of S3 (length = 75 mm, width = 3.2 to 6.3 mm) was located in the middle layer of the board while bigger strand sizes of S1 (length = 75 mm, width = 12.7 to 19.0 mm) and S2 (length = 75 mm, width = 6.3 to 12.7 mm) were located at the face and back layers. Utilization of smaller strands (S3) in the middle layers may yield boards that have better physical and mechanical properties. Except for MOR in the minor axis, board density and resin content were shown to have a substantial impact on physical and mechanical properties. Except for MOR in the major axis, strand size had little affected on physical and mechanical properties. The effects of board density on mechanical properties were discovered to affect significantly different. With a positive correlation, board density had a significant effect on thickness swelling. Between S1+S3 and S2+S3 strand size, there is no significant effect on bending properties, internal bond strength and thickness swelling. The effect of resin content on bending properties revealed a significant difference of MOR in major axis, as well as MOE values in both major and minor axes. Even when the resin content was as low as 5%, all treatments of OSB passed the general requirement of general purpose OSB.

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Conference papers on the topic "MSR Code Construction"

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Zhang, Jingyao. "Concurrent Failure Recovery for MSR Regenerating Code via Product Matrix Construction." In the 12th IEEE/ACM International Conference. New York, New York, USA: ACM Press, 2019. http://dx.doi.org/10.1145/3368235.3368871.

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Sasidharan, Birenjith, Myna Vajha, and P. Vijay Kumar. "An explicit, coupled-layer construction of a high-rate MSR code with low sub-packetization level, small field size and d < (n − 1)." In 2017 IEEE International Symposium on Information Theory (ISIT). IEEE, 2017. http://dx.doi.org/10.1109/isit.2017.8006889.

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Sasidharan, B., P. V. Kumar, N. B. Shah, K. V. Rashmi, and K. Ramachandran. "Optimality of the product-matrix construction for secure MSR regenerating codes." In 2014 6th International Symposium on Communications, Control and Signal Processing (ISCCSP). IEEE, 2014. http://dx.doi.org/10.1109/isccsp.2014.6877804.

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Chen, Zitan, and Alexander Barg. "Explicit constructions of MSR codes for the rack-aware storage model." In 2019 IEEE International Symposium on Information Theory (ISIT). IEEE, 2019. http://dx.doi.org/10.1109/isit.2019.8849278.

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Hou, Hanxu, Kenneth W. Shum, and Hui Li. "Construction of exact-BASIC codes for distributed storage systems at the MSR point." In 2013 IEEE International Conference on Big Data. IEEE, 2013. http://dx.doi.org/10.1109/bigdata.2013.6691659.

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Mengjiao, Wang, Li Yiguo, Wu Xiaobo, Peng Dan, Hong Jingyan, Hao Qian, Zhang Jinhua, and Lu Jin. "A New Low Enrichment Uranium Core Design of MNSR." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-66518.

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The Miniature Neutron Source Reactor (MNSR) is a low-power research reactor, which uses 90% high enriched uranium (HEU) fuel. However, due to the nuclear safety risk, and according to the principle of nuclear non-proliferation, MNSR must be gradually converted from HEU to low enriched uranium (LEU), which means the LEU fuel with U-235 enrichment less than 20% should be used. The prototype MNSR of China Institute of Atomic Energy has completed the transformation, but other commercial MNSRs have not finished, which is different with the prototype in the application and structure. Therefore, using MCNP code to simulate, calculate and optimization design LEU core has been done in this issue. Firstly, UO2 with U-235 enrichment of 12.5% was selected as the fuel pellet of LEU core, keeping the rest of the core unchanged. The Φ, excess reactivity and the worth of the central control rod are calculated and analyzed. The results show that the commercial MNSR of LEU conversion is feasible. Secondly, in this paper, through changing the fuel elements and the arrangement method, the new low enriched uranium (NLEU) core was designed to improve Φ/P ratio of the core, the proportion of thermal neutrons and the worth of the control rod. UO2 with U-235 enrichment of 19.75% was selected as the fuel pellet of the NLEU, NLEU not only meets the design parameters, but in many parameters, NLEU is better than LEU. The fuel element quantity is reduced by 43%, from original 344 to 196; reducing the amount of U-235 loading; improving the Φ/P ratio and the thermal neutron fraction is increased. The results show that the NLEU optimizes some parameters, simplifies the core structure, saves the construction cost, improves the nuclear safety and is more suitable for the application of MNSR.

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Li, Guodong, Ningning Wang, Sihuang Hu, and Min Ye. "Constructing MSR codes with subpacketization 2^n/3 for k + 1 helper nodes." In 2022 IEEE International Symposium on Information Theory (ISIT). IEEE, 2022. http://dx.doi.org/10.1109/isit50566.2022.9834655.

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Gafiyatullin, Dmitry, Colin McKinnon, and Vincent Gaffard. "Pipelines Design and Construction Codes." In SPE Arctic and Extreme Environments Conference & Exhibition. Society of Petroleum Engineers, 2013. http://dx.doi.org/10.2118/166975-ms.

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Young, Raymond, and Manou Kashani. "Carbon Footprint Minimization for Deepwater Pipelay Construction." In Offshore Technology Conference. OTC, 2021. http://dx.doi.org/10.4043/31105-ms.

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Abstract With recent oil and gas discoveries in deepwater offshore, these regions have become the hotspots for oil and gas exploration. It is for this reason that major pipelay contractors are developing more advanced construction vessels with high lay tension capacity, payload and high specification dynamic positioning (DP) systems to operate at even deeper water depths. It is shown that at water depths of greater than 1000 m, one of the major construction costs is fuel consumption, which is directly related to the level of thrust and hold back tension the laybarge is required to maintain during pipelay operations. Furthermore, the fuel consumption and the resulting carbon footprint, is shown to increase disproportionally as the laybarge thrust increases at deeper water depths. For example, a deepwater laybarge (DP3 class) with a typical operating power of 40MWe can consume 130 metric tonnes of diesel fuel per day (1.5 kg/s) with carbon dioxide equivalent emissions (CO2e) of 3,200 kg per tonne of fuel. This is a substantial measure of emissions, typical of a pipelay vessel during pipe lay operations. It is for this reason that American and European air pollutant emission inventory guidelines expect environmental impact documents for all marine activities, including construction, to be calculated and submitted to relevant environmental protection agencies. By comparison, a typical car will produce around 4,600 kg of CO2e per year. Currently, deepwater pipeline engineering and design is based on relevant offshore design codes and standards, e.g. DNV-GL and API. Within the framework of those codes and standards, a design approach is presented within this paper that shows that, by properly combining pipe strength and stiffness characteristics with pipelay construction loads, a unique bending strain limit can be defined that would lead to the most economical solution that minimizes the vessel thrust and thereby radically reduce fuel consumption and associated CO2e emissions during pipelay activities. This unique design approach would be of interest to operators, pipe manufacturers as well as the pipelay contractors. Because of the construction economy and the minimizing of the carbon footprint, this approach is an attractive design method to all concerned parties, including environmental protection agencies. Since the design approach promotes higher steel grades, it would be very much in the interest of pipe mills to further develop and elevate the use of higher steel grades higher than the present widely used API 5L, X-65. Pipelay contractors will benefit by installing pipe with lower levels of thruster power, resulting in safer and a more reliable station keeping and, most significantly, a lower fuel consumption.

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Keating, Robert, and Suzanne McKillop. "Technical Basis for Proposed ASME Code Case for Construction of Compact Heat Exchangers in High Temperature Reactors." In ASME 2021 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/pvp2021-60926.

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Abstract The U.S. Department of Energy has recently completed a research program to support the development of the compact heat exchanger (CHX) for use in high temperature advanced reactors. The project was executed by an Integrated Research Project (IRP) and includes team members from the University of Wisconsin–Madison, University of Michigan, Georgia Institute of Technology, University of Idaho, North Carolina State University, Oregon State University, Electric Power Research Institute, MPR Associates, and heat exchanger manufacturers CompRex and Vacuum Process Engineering. The research was guided by a roadmap to support the eventual adoption of an American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code, Section III, Code Case for compact heat exchanger designs in high temperature reactor service. This roadmap is outlined in Journal of Nuclear Engineering and Radiation Science, NERS 19-1161, which identified specific research gaps to support the Code Case. The IRP has completed the research and the ASME Section III Standards Committee is in the process of writing and approving a Code Case for Section III, Division 5, Class A applications. This paper provides the detailed technical basis for the ASME Code Case for CHX. The paper provides a vital link between the research results and the proposed Code Case and closes the research gaps that are tied to the original Roadmap. In addition, the paper provides further detailed commentary on the proposed requirements. The major technology gaps included material properties, failure modes and effects, analysis methods, and examination methods. The IRP studied basic material properties of diffusion bonded plate, creep and fatigue models, development of NDE methodology and development of advanced analytical approaches to design.

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Reports on the topic "MSR Code Construction"

1

Gupta, Kanika, Sung Soo Park, Antonio Bobet, and Tommy Nantung. Improved Reliability of FWD Test Results and Correlations with Resilient Modulus. Purdue University, 2022. http://dx.doi.org/10.5703/1288284317370.

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Resilient modulus (MR) is a key factor in the Mechanistic Empirical Pavement Design Guide (MEPDG) which was adopted by INDOT in January 2009. The resilient modulus can be determined in new pavement projects from subgrade soil samples collected at the site. However, for a pavement rehabilitation project, it becomes difficult to obtain soil information, and coring for samples may not be feasible because of traffic. The literature is rich with correlations between the MR of the subgrade obtained in the laboratory with that estimated from FWD tests in the field. However, the review conducted shows very contradictory and inconsistent findings, thus existing correlations seem to apply only to the cases investigated, i.e., they are ad hoc correlations and cannot be generalized. To improve the interpretation of the FWD data and enhance the reliability of the results in Indiana, FWD and GPR tests were performed at five different road construction projects at the same locations where soil samples were collected and tested in the laboratory for resilient modulus. The selected sites included roads with rigid pavement and treated subgrade and flexible pavement with untreated subgrade. The study showed that (1) FWD backcalculation is greatly affected by pavement thickness; (2) GPR can provide actual thicknesses and can identify discrepancies between as-built and design pavement thickness; (3) for flexible pavements, a one-to-one correlation exists between FWD modulus and laboratory resilient modulus values for untreated subgrade soils; (4) MODTAG or ELMOD codes can both be used to estimate the resilient modulus of the subgrade in flexible pavements; (5) for rigid pavements, results of FWD backcalculation analysis using ELMOD or MODTAG greatly overestimate the resilient modulus of the soil, with backcalculated moduli 1.3 to 6 times higher than laboratory results; (6) ELMOD is recommended for routine analysis of FWD data, while MODTAG is recommended for research or to evaluate the quality of the data, when needed.

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