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1
Viehrig, Hans-Werner, Eberhard Altstadt, Mario Houska, Gudrun Mueller, Andreas Ulbricht, Joerg Konheiser, and Matti Valo. "Investigation of decommissioned reactor pressure vessels of the nuclear power plant Greifswald." Helmholtz-Zentrum Dresden - Rossendorf, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-235681.
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The investigation of reactor pressure vessel (RPV) material from the decommissioned Greifswald nuclear power plant representing the first generation of Russian-type WWER-440/V-230 reactors offers the opportunity to evaluate the real toughness response. The Greifswald RPVs of 4 units represent different material conditions as follows:
• Irradiated (Unit 4),
• irradiated and recovery annealed (Units 2 and 3), and
• irradiated, recovery annealed and re-irradiated (Unit1).
The recovery annealing of the RPV was performed at a temperature of 475° for about 152 hours and included a region covering ±0.70 m above and below the core beltline welding seam.
Material samples of a diameter of 119 mm called trepans were extracted from the RPV walls. The research program is focused on the characterisation of the RPV steels (base and weld metal) across the thickness of the RPV wall. This report presents test results measured on the trepans from the beltline welding seam No. SN0.1.4. and forged base metal ring No. 0.3.1. of the Units 1 2 and 4 RPVs. The key part of the testing is focussed on the determination of the reference temperature T0 of the Master Curve (MC) approach following the ASTM standard E1921 to determine the facture toughness, and how it degrades under neutron irradiation and is recovered by thermal annealing. Other than that the mentioned test results include Charpy-V and tensile test results. Following results have been determined:
• The mitigation of the neutron embrittlement of the weld and base metal by recovery annealing could be confirmed.
• KJc values of the weld metals generally followed the course of the MC though with a large scatter.
• There was a large variation in the T0 values evaluated across the thickness of the multilayered welding seams.
• The T0 measured on T-S oriented SE(B) specimens from different thickness locations of the welding seams strongly depended on the intrinsic structure along the crack front.
• The reference temperature RT0 determined according to the “Unified Procedure for Lifetime Assessment of Components and Piping in WWER NPPs - VERLIFE” and the fracture toughness lower bound curve based thereon are applicable on the investigated weld metals.
• A strong scatter of the fracture toughness KJc values of the recovery annealed and re-irradiated and the irradiated base metal of Unit 1 and 4, respectively is observed with clearly more than 2% of the values below the MC for 2% fracture probability. The application of the multimodal MC-based approach was more suitable and described the temperature dependence of the KJc values in a satisfactory manner.
• It was demonstrated that T0 evaluated according to the SINTAP MC extension represented the brittle fraction of the data sets and is therefore suitable for the nonhomogeneous base metal.
• The efficiency of the large-scale thermal annealing of the Greifswald WWER 440/V230 Unit 1 and 2 RPVs could be confirmed.
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Stewart, Kevin Michael. "Evaluating end-of-life strategies for decommissioned semiconductor facilities." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/44602.
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Thesis (M.B.A.)--Massachusetts Institute of Technology, Sloan School of Management; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering; in conjunction with the Leaders for Manufacturing Program at MIT, 1997.Includes bibliographical references (p. 117-118).
This thesis studies the life-cycle of semiconductor facilities and the potential roles that they may play once they reach the end of their life. Specifically, the author's findings are based on studies associated with the decommissioning of a semiconductor manufacturing facility ("fab") at the Intel Corporation's Aloha Campus in Portland, Oregon. With increasing demarids for its products, Intel is constructing newer and more modern facilities to support large-scale manufacturing efforts. As newer product lines and facilities come on line, older product lines are being eliminated and older semiconductor facilities that produced them are consequently being shut down largely without regard for what their use will be afterwards. As such, this study starts by first looking at the concept of facility life-cycle with respect to semiconductor manufacturing facilities. After discussing potential pre-shutdown planning requirements, the author presents an empirical framework for evaluating possible roles that these fabrication facilities could play after they are taken out of service. In brief, the framework consists of five general steps - (1) establish reference state; (2) develop list of alternatives; (3) establish decision factors; (4) generate measures for comparison; and (5) compare and contrast to draw conclusions -and is based upon a thorough consideration of all relevant technical, strategic, and financial issues. The paper then applies the framework to a current semiconductor manufacturing facility that was the focus of this research. The example developed for Intel's Fab 4 demonstrates that a combination of a short-term role (utilizing the building as a manufacturing support platform) and a long-term strategy (combining the resources of Fab 4 and Fab 5) appears to be the "most feasible" set of alternatives. In addition, the methodology is then applied to other examples of past and potential future wafer fabrication facility decommissioning projects. Conclusions from this research indicate that a process-oriented (rather than outcome-oriented) framework best captures the iterative and dynamic nature of the problem. As such, the major contribution of this methodology is that it presents a framework for how to think about the problem rather than how to immediately solve it. As such, the author believes that the research results presented herein are not intended to be a panacea for what remains to be a difficult problem. However, since companies will no longer be able to walk away from existing facilities, the author concludes that incremental investment and planning for adaptive re-use during the facility's lifetime would appear to offer numerous advantages over waiting until after it is shut down.
by Kevin Michael Stewart.
S.M.
M.B.A.
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Ross, Justin Henry. "Evaluating ultimate bridge capacity through destructive testing of decommissioned bridges." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 154 p, 2007. http://proquest.umi.com/pqdweb?did=1338919151&sid=8&Fmt=2&clientId=8331&RQT=309&VName=PQD.
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Thesis (M.C.E.)--University of Delaware, 2007.Principal faculty advisors: Michael J. Chajes and Jennifer Righman McConnell, Dept. of Civil & Environmental Engineering. Includes bibliographical references.
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Farrow, Elizabeth Chapin. "A new life adaptive reuse and redevelopment of decommissioned commercial nuclear power plants /." [Gainesville, Fla.] : University of Florida, 2008. http://purl.fcla.edu/fcla/etd/UFE0023705.
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Sumsion, Eric Scott. "Condition Assessment of Decommissioned Bridge Decks Treated with Waterproofing Membranes and Asphalt Overlays." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/4009.
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The objective of this research was to assess the condition of four decommissioned bridge decks treated with waterproofing membranes and asphalt overlays following the completion of their service lives. Large samples were cut from each of the bridge decks immediately prior to demolition and taken to the Brigham Young University Highway Materials Laboratory, where extensive sampling and testing was performed. Methods used to evaluate the condition of the bridge deck samples included visual inspection, hammer sounding, Schmidt rebound hammer testing, resistivity testing, half-cell potential testing, linear polarization testing, cover depth measurement, and chloride concentration measurement. The samples were removed from four concrete bridge decks along the Interstate 15 corridor in Provo, Utah. One bridge deck was constructed in 1937, two were constructed in 1964, and one was constructed in 1984. Each of the bridge decks was constructed using conventional cast-in-place methods. With the exception of the 1984 bridge deck, which had epoxy-coated rebar, all of the bridge decks were reinforced with black bar. A waterproofing membrane was installed on each of the bridge decks in 1984, meaning each waterproofing membrane had been in service for 26 or 27 years at the time of sampling. With the exception of one of the bridges, which was in good condition after 26 years of service, each of the bridge decks sampled had successfully served for at least 46 years. Aside from asphalt maintenance, no rehabilitation was needed on any of the bridge decks following installation of the waterproofing membranes. Without the application of the waterproofing membranes, the chloride concentrations in the bridge decks likely would have been much higher. Additional exposure to chloride ions from deicing salts would have quickly increased the chloride concentration in the concrete above critical levels, which would have led to significant corrosion and bridge deck deterioration, prematurely. While the application of membranes as a bridge deck maintenance procedure has mostly been replaced by the use of epoxy-based polymer overlays, many bridge decks protected with membrane systems are still in service today. The research findings suggest that application of waterproofing membranes and asphalt overlays in a timely manner, before the accumulation of excessive amounts of chlorides within a deck, can be an effective approach for concrete bridge deck preservation.
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Huisamen, Altus. "Quantification methods and management of hydrogeochemistry in decommissioned collieries of the Mpumalanga Coalfields." Thesis, University of Pretoria, 2017. http://hdl.handle.net/2263/63215.
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Mine water chemistry and its evolution has been the focus of various studies. However, these
studies were primarily based on data from underground mines, pit lakes and mining waste dumps.
Backfilled opencast mines have received limited attention in this regard and were postulated to
undergo an initial flush, in a similar fashion to underground mines. Previous work in the prediction of
mine water quality focussed on the fitting of an idealised decay rate curve to existing mine water
chemistry data, analytical calculations, simplified geochemical modelling approaches and numerical
transport models. This study has taken components from these approaches to predict the evolution
of mine water quality from backfilled opencast mines, during the initial flush, but with an additional
component, defining it as a new approach. This component is calibration of geochemical modelling
data and numerical flow and transport modelling data, with existing groundwater monitoring data
over a short term, relative to the duration of the initial flush. Laboratory analyses were further used
to augment the calibration process in various steps. Results obtained show that the initial flush in
backfilled opencast mines is likely to last 20 to 100 years, depending on site specific conditions. To
further understand this duration, speciation modelling and statistical analysis was undertaken to
determine controlling mineral phases in solution at backfilled opencast coal mines. Pyrite, gypsum,
calcite, kaolinite and possible smectite were identified as the major controlling mineral phases in
mine water chemistry of backfilled opencast coal mines at the study sites used for this thesis. Based
on the understanding of the controlling mineral phases in solution and the calibrated mine water
quality predictions made, the study also proposed the maximisation of water addition to backfilled
opencast coal mines as a means to accelerate the initial flush, potentially turning contaminated mine
water into a resource.Thesis (PhD)--University of Pretoria, 2017.
Geology
PhD
Unrestricted
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Silingardi, Alberto. "Design of a Subsea Observatory to monitor the environmental impacts in a decommissioned area." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
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When oil and gas fields end production, offshore installations need to be dismantled and disposed of. The set of processes used to do this could be summed up in the term Decommissioning. The Decommissioning of fixed offshore structures is one of the biggest technical and operational challenges in the O&G industry. Due to this complexity, also in term of HSE, in particular site Decommissioning could lead to potential environmental hazards which need to be monitored. The BP Miller platform is going to be completely decommissioned in the near future. Due to derogation to the OSPAR legislative framework for decommissioning in the North Sea, the Jacket footings of the platform and the contaminated drill cutting piles will remain in situ. The aim of this document is to examine the BP Miller site as a reference point to start an initial design for a subsea observatory which could be used to monitor the marine conditions around the BP Miller footings. The DELOS subsea observatory was chosen as a reference as it includes modularity in its design. This study was divided in two phases: the first phase consisted in a desktop study aimed to assess the state of art of the in-situ technology for marine environmental monitoring and the published reports about contaminated cutting piles characterization. At the end of the first phase a complete list of parameters to monitor was achieved. The second phase consisted in the conceptual design of the subsea observatory. Starting from each selected parameter, a subsea sensing technology was identified. Consequently, from the set of the chosen instruments a subsea observatory was conceived and designed following the DELOS logic which allowed adding modularity to the final project and offer the possibility to improve the design in time, following the necessary developments of the in-situ monitoring technique, which as highlighted in the first phase of the project, are steadily increasing but are far from being already effective.
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Li, Xiawen. "Power System Stability Improvement with Decommissioned Synchronous Machine Using Koopman Operator Based Model Predictive Control." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/102503.
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Traditional generators have been decommissioned or replaced by renewable energy generation due to utility long-standing goals. However, instead of flattening the entire plant, the rotating mass of generator can be utilized as a storage unit (inertia resource) to mitigate the frequency swings during transient caused by the renewables. The goal of this work is to design a control strategy utilizing the decommissioned generator interfaced with power grid via a back-to-back converter to provide inertia support. This is referred to as decoupled synchronous machine system (DSMS). On top of that, the grid-side converter is capable of providing reactive power as an auxiliary voltage controller. However, in a practical setting, for power utilities, the detailed state equations of such device as well as the complicated nonlinear power system are usually unobtainable making the controller design a challenging problem. Therefore, a model free, purely data-driven strategy for the nonlinear controller design using Koopman operator-based framework is proposed. Besides, the time delay embedding technique is adopted together with Koopman operator theory for the nonlinear system identification. Koopman operator provides a linear representation of the system and thereby the classical linear control algorithms can be applied. In this work, model predictive control is adopted to cope with the constraints of the control signals. The effectiveness and robustness of the proposed system are demonstrated in Kundur two-area system and IEEE 39-bus system.Doctor of Philosophy
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Rasekhafshar, Samsam. "Global Fatigue Assessment of a Decommissioned Jacket Platform for a Sustainable Reuse as an Offshore Wind Turbine." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
Find full textAbstract:
When the offshore oil and gas supplies exhaust, offshore platforms must be decommissioned and removed. The present thesis highlights the importance of evaluating the possibility of reuse of decommissioned offshore jacket platforms for offshore wind energy. In order to shift to the new structure, the topside must be removed from the substructure and a wind turbine can be installed in its place.
The feasibility of this project was investigated using a finite element analysis software called Sesam. To study fatigue life in offshore structures, an exhaustive review of the background and state of the art was done.
A finite element model was created by the means of Sesam and two different fatigue analysis approaches were applied and compared. In the end, an analysis methodology is suggested for the structural fatigue analysis of offshore wind turbine structures based on international standards, addressing the industry’s need to account for the combined effect of wind and hydrodynamic loads in these type of structures.
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Miller, Malik. "The reconstruction and FEA analysis of the decommissioned WWII era destroyer USS Cassin Young in the SolidWorks environment." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/83728.
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Thesis (S.B.)--Massachusetts Institute of Technology, Department of Mechanical Engineering, 2013.Cataloged from PDF version of thesis.
Includes bibliographical references (page 29).
An attempt was made at reconstructing the now decommissioned World War II era destroyer USS Cassin Young using blueprints on file at the Hart Nautical Museum . After the electronic model was constructed, an attempt was made to run an FEA analysis to determine stress levels in the ship's hull. The ship was made using the various Solidworks tools available including surfacing and extrusion tools while using the available blueprints for recreation accuracy. The FEA was not completed due to problems encountered in the meshing and analysis of the complex geometry of the ship hull.
by Malik Miller.
S.B.
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Larsen, Sofie, and Camilla Spång. ""Man vill inte bli en mänsklig version av en digital tjänst" : en studie om turistbyråns avveckling i Uppsala och Malmö." Thesis, Linnéuniversitetet, Institutionen för organisation och entreprenörskap (OE), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-91165.
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Abstract The study began out of curiosity to research stakeholders perception about decommissioning visitors centers in Sweden. Decommissioning visitors centers is an ongoing trend caused by the change in visitor behaviour. A major cause to this change is the new information- and communication technologies such as more advanced digital platforms. Through an inductive research approach and a qualitative research method have we studied the phenomenon decommissioning of visitor centers. The empirical material is gathered through unstructured telephone interviews with relevant stakeholders. We concluded that stakeholders at both destinations have experienced a greater responsibility for the hospitality given. They also got the impression that visitors do not gain enough essential information upon arrival and gets baffled by this lack of information. In addition to this, the result of the study indicates a blurred line around who is responsible for the personal and the digital hospitality at the destinations. The confusion about who's in charge for handing out tourism information is present at both destinations.
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Lethugile, Goabamang. "When a city embraces its paradox : the exploration of incremental waste mining of a decommissioned landfill site and its gradual transformation into a productive public space." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/16357.
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Today, with the majority of the world's population now living in urban areas. the possibility and urgent need to provide them with adequate public spaces has never been greater for the planet. Where public places and space itself are lacking. many cities across the world are today investing in projects of reclaiming valuable land to create livable public spaces that respond to and improve social, economic, and environmental values. Such projects include reclaiming of derelict sites which are characterized mainly by poor environmental and physical conditions. The redevelopment of these types of sites has received a lot of attention in the past few years. Their transformation into public spaces represents a significant enhancement to the quality of life and land use. and at the same time. marks new commitment to the transformation of once· condemned sites. to new cultural and environmental uses. Landscape architects such as Peter Latz. James Comer and Bruce Mau have shown how to create culturally stimulating landscapes with a Iarge variety of uses and activities arising out of the derelict remains of past industry. (Loures and Panagopoulos. 2006) Derelict or lost spaces such as the ones created by closed landfills and closed down industrial sites provide possibilities of generating productive public spaces that could serve to address the needs of the growing population. Contemporary approaches to these sites are mostly driven by the idea of reclaiming space for a variety of uses, from the reuse of an industrial area. to conversion Into housing or a park. It is the assumption that these types of sites, because of their high degree of complexity and contestation. are particularly suited to test and develop different theoretical and practical approaches to the redesign of public or mixed-use open spaces. (Langhorst. 2009) .
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Costanza, James. "Environmental and Economic Assessment of Reclaimed Polyurethane Panels: The Case of Diverting Decommissioned Cold Storage Panels From Landfills and Recycling Into Three Forms of Insulative Building Materials." Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:24078364.
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This study investigates the long-term thermal performance of polyurethane insulated cold storage panels and the environmental and economic impact of recycling such panels when taken out of service in lieu of discarding them in landfills.
It is estimated, as of 2015, over 180 million square feet of insulated cold storage panels are manufactured annually in the U.S. The panels are most frequently constructed of closed-cell, low density polyurethane insulation utilizing HCF 245fa and HCF 134a blowing agents containing up to 6 million metric tons (CO2e) of greenhouse gases. The expected operating lifetime of the cold storage panels is 15 years after which time they are primarily discarded in landfills. This practice contributes to the build-up of greenhouse gases in the atmosphere, destroys valuable insulating and building materials and requires landfill space for the solid waste.
Three recycling strategies were investigated as ways to repurpose the discarded framed cold storage panels into new forms of polyurethane insulating materials; repurposed cold storage panels, board stock insulation sheets and blown-in/fill insulation. I used three research methods to quantify the environmental and economic impacts. The first examined the initial and long-term thermal performance of the recycled polyurethane insulation through laboratory testing and extrapolative modeling. The second method was comparative life cycle assessments between the business-as-usual-case of discarding the polyurethane insulation with each of the recycled strategies. Finally, an economic analysis was completed for each recycling strategy to determine the in-use heating & cooling energy savings from the extended life of the recycled insulation.
This research shows recycling of discarded polyurethane cold storage panels provide measurable environmental and economic benefit. First, the productive life of the insulation is extended greatly beyond its initial use period reducing the need for fossil fuels and raw materials to make replacement insulations. Secondly, the high insulating value of the recycled polyurethane maximizes future environmental and economic savings from lower fuel demand in space heating and cooling applications. Thirdly, the majority of the sequestered greenhouse gases continue to be bound in the foam; protecting the environment from the release of global warming gases. Finally, by diverting the cold storage panels from landfills, millions of cubic feet of landfill space are unneeded annually.
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AlAli, May. "A Comparative Analysis of Decommissioning Scenarios Based on Radiation Dose Modeling and Multi-criteria Decision Analysis for Oskarshamn Nuclear Reactor 3 : Lessons Learned from Operating Experience in the Reuse of Decommissioned Sites." Thesis, Uppsala universitet, Institutionen för elektroteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-438560.
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An increasing number of decommissioning activities are being undertaken worldwide at facilities where radioactive material has been produced, used, or managed, which will also be the case of the Oskarshamn nuclear reactor O3 in Sweden, the remaining operational unit at that power plant. Decommissioning, which seems to be the sign of ending, is, in fact, a future-oriented process that can prove successful the safe management of nuclear facilities throughout their entire lifetimes but especially after shutdown. In this context, this research aims to develop a comparative profile of decommissioning scenarios based on a radiation dose modeling approach using RESRAD-BUILD software. Conducting then a multi-criteria decision analysis (MCDA) of scenario comparison for the decommissioning of O3 is essential for updating on-going decommissioning projects, making strategic decisions for future ones, and bringing in sustainable site reuse options. The exposure-to-dose model will be used to evaluate and optimize safety parameters, site release levels particularly, related to personnel and the environment. Testing multiple sets of parameters in the decommissioning plan will be used to compare results and to assess the sensitivity of the strategy to variable inputs. This comparison with the MCDA Analytic Hierarchy Process model (AHP) results will allow the identification of the most optimal reuse scenario for Oskarshamn unit 3 after its useful life ends. Also, the lessons learned from operating experience in the reuse of decommissioned nuclear sites can be incorporated systematically into the eventual decommissioning of O3, and which, according to current planning will run until 2035 or 2045.
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Teng, Sin Yong. "Intelligent Energy-Savings and Process Improvement Strategies in Energy-Intensive Industries." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-433427.
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S tím, jak se neustále vyvíjejí nové technologie pro energeticky náročná průmyslová odvětví, stávající zařízení postupně zaostávají v efektivitě a produktivitě. Tvrdá konkurence na trhu a legislativa v oblasti životního prostředí nutí tato tradiční zařízení k ukončení provozu a k odstavení. Zlepšování procesu a projekty modernizace jsou zásadní v udržování provozních výkonů těchto zařízení. Současné přístupy pro zlepšování procesů jsou hlavně: integrace procesů, optimalizace procesů a intenzifikace procesů. Obecně se v těchto oblastech využívá matematické optimalizace, zkušeností řešitele a provozní heuristiky. Tyto přístupy slouží jako základ pro zlepšování procesů. Avšak, jejich výkon lze dále zlepšit pomocí moderní výpočtové inteligence. Účelem této práce je tudíž aplikace pokročilých technik umělé inteligence a strojového učení za účelem zlepšování procesů v energeticky náročných průmyslových procesech. V této práci je využit přístup, který řeší tento problém simulací průmyslových systémů a přispívá následujícím: (i)Aplikace techniky strojového učení, která zahrnuje jednorázové učení a neuro-evoluci pro modelování a optimalizaci jednotlivých jednotek na základě dat. (ii) Aplikace redukce dimenze (např. Analýza hlavních komponent, autoendkodér) pro vícekriteriální optimalizaci procesu s více jednotkami. (iii) Návrh nového nástroje pro analýzu problematických částí systému za účelem jejich odstranění (bottleneck tree analysis – BOTA). Bylo také navrženo rozšíření nástroje, které umožňuje řešit vícerozměrné problémy pomocí přístupu založeného na datech. (iv) Prokázání účinnosti simulací Monte-Carlo, neuronové sítě a rozhodovacích stromů pro rozhodování při integraci nové technologie procesu do stávajících procesů. (v) Porovnání techniky HTM (Hierarchical Temporal Memory) a duální optimalizace s několika prediktivními nástroji pro podporu managementu provozu v reálném čase. (vi) Implementace umělé neuronové sítě v rámci rozhraní pro konvenční procesní graf (P-graf). (vii) Zdůraznění budoucnosti umělé inteligence a procesního inženýrství v biosystémech prostřednictvím komerčně založeného paradigmatu multi-omics.
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Hsien-JuiYu and 余憲睿. "An Analysis of Reclamation Strategy for a Decommissioned Landfill." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/nwk559.
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HUANG, PO-CHIA, and 黃柏嘉. "The landscape of time, the decommission of Wanda dam." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/5m28d2.
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Lin, Yeng-Kuang, and 林彥光. "Evaluation of Radionuclides In Concrete Shielding for Nuclear Power Plant Decommission." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/66221101075342916068.
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Baker, Fred A., and Debbie S. Berthelot. "Long-term management of tailings and tailings dams at decommissioned mining properties." 1999. http://hdl.handle.net/2429/9614.
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Recent additions to government legislation addressing mine closure issues and
responsibilities, together with several recent unfortunate and significant failures of tailings containment systems have necessarily focussed industry and the public's attention on the long-term, even perpetual, requirement for management of tailings. A serious question now facing the mining industry and government is how these waste facilities can best be safely managed to ensure protection of human health and the environment in the long term. There are probably several viable alternatives, depending upon the actual specifics of the particular site. One option is considered to be management by a specialist third party contractor. In March 1998, Rio Algom Limited was presented with an opportunity to test third party management of a group of mine facilities situated in the Elliot Lake area, comprising of 11 mine sites and 7 closed and decommissioned tailings management areas with 5 active effluent treatment plants.
This paper presents the approach to managing liability, cost and risk under third party management with a focus on facility inspection and maintenance programs.
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Chou, Ta-Hsin, and 周大鑫. "Preliminary Study of Collecting Device for Decommission of Nuclear Power Plant Using Abrasive Water Jet." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/06611191448022900589.
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碩士國立清華大學
動力機械工程學系
89
The collecting device attached to the abrasive water jet for decommissioning of nuclear power plant is studied to remove water, abrasives and chips. For decommissioning the concrete and steel structure of nuclear power plant, the experiments include concrete milling, steel plate cutting, and steel tube cutting. Two grades of compressive strength of the concrete, 35MPa and 14MPa, are chosen in the experiment and the effects of shroud shape, shroud size, tube inside diameter, tube length, vessel volume, and power of vacuum pump on the waste collecting efficiency are investigated. 304L stainless steel and A572 alloy steel are chosen to observe the performance of collecting device and to estimate the life of the catcher. 304L stainless steel tube same as in-core guide tube inside the reactor is used for tube cutting, and a shroud wrapping the steel tube is designed. The performance of this shroud in the experiment of circle and line cutting is evaluated. The obtained results provide a reference for the prototype and process development in decommission technology. Keywords：Nuclear Power Plant, Decommission, Waste Collection, Abrasive Waterjet.
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Sundine, Joshua. "Ecosystem services urban design framework: an adaptive vision for the Dallas Air Naval Station." 2018. http://hdl.handle.net/2097/38886.
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Master of Landscape ArchitectureDepartment of Landscape Architecture and Regional & Community Planning
Jessica Canfield
Located eight miles from the heart of Dallas, The Dallas Air Naval Station is a 1045-acre decommissioned airfield site. Since its closure in 1998, it has predominantly sat idle, bringing little value to adjacent neighborhoods and the greater community. Due to prolonged site remediation and no formal redevelopment plan, the site’s full potential has yet to come to fruition. Current urban design models tend to primarily focus on achieving a singular, end-result. However, as cities and the environment become more complex and unpredictable, these types of models often lack the ability to respond to change. Adaptive design, on the other hand, allows for more exploration of innovative practices, tools, techniques and methods that are informed by ecological knowledge and research design. As means of illustrating how adaptive design can catalyze and benefit brownfield sites, this project proposes an urban design framework informed by ecosystem services. Ecosystem services are an essential component to human well-being and environmental health, and when used as a guiding principle in site design, can add resiliency and beneficial outcomes to a site. To inform the development of the Ecosystem Services Urban Design Framework, this project uses literature, a site analysis, an applicable ecosystem services analysis, and precedent analyses. The framework is then applied to an urban brownfield site, the Dallas Air Naval Station, to show its applicability for short-term and long-term adaptive design scenarios. Dallas’ current issues and needs are addressed by the short-term plan, whereas informed projections of future issues inform the long-term design scenarios. Collectively, this project illustrates the imperative for incorporating adaptability into urban design, and for the value of using ecosystems services as underlying foundation.
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Laidlow, Allison. "Characterization of Uranium and Rare Earth Element Mobility and Attenuation Downstream of Decommissioned Tailings Impoundments at the Bicroft Mine near Bancroft, Ontario." Thesis, 2013. http://hdl.handle.net/1974/8022.
Full textAbstract:
Attenuation of uranium (U) and rare earth elements (REEs) has been observed in stream and wetland sediments, but the geochemical and mineralogical processes involved in sequestering these elements in natural systems are not well understood. The decommissioned Bicroft Uranium Mine near Bancroft, ON uses a modified stream and wetland system to reduce the concentrations of U and other metals in tailings pond effluent to levels below the Provincial Water Quality Objectives. The Bicroft Mine was operated from 1957 to 1963, and processed low-grade (~0.17 wt% U3O8), disseminated U hosted by pegmatite dykes in amphibolite gneiss, forming 2,284,421 tonnes of tailings, deposited into two tailings impoundments. The Bicroft site has since operated as a passively attenuating stream and wetland remediation system for 55 years, demonstrating the potential longevity and viability for long-term sequestration of U and REEs through natural attenuation.
To identify U and REE hosts and their stability in the natural environment, colloids, tailings, stream and wetland sediments were analyzed using various methods, including tangential flow filtration (TFF), ICP-ES/MS, scanning electron microscopy, and synchrotron techniques (bulk and µXANES, µXRF, and µXRD). The results show that Fe- and Mn-oxyhydroxides, goethite, and birnessite are the main mineral hosts for U and REEs in both the colloids and sediments. In addition, detrital grains of U- and REE-bearing minerals were found >200 m downstream in colloids and wetland sediments, showing the potential for long range transport of colloids and particulates in the stream system. Seasonal influences on the stability of trace metals in sediments were observed, and may demonstrate the limitations of passively attenuating remediation systems as a viable method for attenuation. Changes in the redox state of the stream system were observed to influence the attenuation of U and REEs, however, changes in the redox state with depth in the wetland sediments were not observed, and showed no direct influence on the attenuation of U and REEs. The results of this study will help to develop better monitoring strategies for U tailings sites and should reduce the impacts of future U mining operations.Thesis (Master, Geological Sciences & Geological Engineering) -- Queen's University, 2013-05-06 07:44:03.327