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Showing 1 to 20 of 44 for “"LOCA"”.
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Calculation of Local Heat Transfer Coefficients in Containment After a Loca
Made available in DSpace on 2017-07-06T18:55:06Z (GMT). No. of bitstreams: 3 Leung_Dominic_M_MS.pdf: 34136601 bytes, checksum: 44a40444c0e1c70eae6f96ecb6746631 (MD5) Leung_Dominic_M_MS_ABS.pdf: 452218 bytes, checksum: 53d9dd977a0bc1f5e2366ff5d6d3ba43 (MD5) license.txt: 4813 bytes, checksum: …
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Investigation of calcium orthophosphate chemical effects in a post-LOCA nuclear reactor containment
… following a Loss of Coolant Accident (LOCA) could lead to the formation of chemical precipitates that in turn cause head-loss increase due to filtering through a fibrous debris accumulation at the sump pump screens. Experiments conducted on the bench scale show that the level of …
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Možnosti zvyšování jaderné bezpečnosti pro koncept pasivního systému s ledními kondenzátory v případě LOCA hávárie
… Ta má za úkol snížit nárůst tlaku během LOCA. Zabývá se určitým typem pasivní ochrany, a to ledovým kondenzátorem. V kapitolách je postupně vypracován návrh náhrady stávajícího materiálu za jiný, který mění svojí fázi při vyšší teplotě. Byl vybrán vhodný materiál, vypracován tepelný …
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Design of an experimental loop for post-LOCA heat transfer regimes in a Gas-cooled Fast Reactor
… regimes found in post Loss of Coolant Accident (LOCA) operation of a Gas-cooled Fast Reactor (GFR). As a result a scaling analysis of the proposed test facility was undertaken to demonstrate that the proposed loop would be able to operate in these aforementioned regimes. Having verified that the …
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Heat and Mass Transfer in Reactor Core During a Loca-Single Channel Analysis (Mixed Convection, Numerical, Flow, Thermal-Hydraulics)
… scenario following a loss-of-coolant accident (LOCA) is of central importance in the safety analysis of water reactors. During LOCA, the reactor core is uncovered and the residual water inventory is boiled off by fission products decay heating. For the Three Mile Island (TMI-2) reactor, it was …
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Spatio-temporal probabilistic methodology to estimate location-specific loss-of-coolant accident frequencies for risk-informed analysis of nuclear power plants
… activities. Since loss-of-coolant accidents (LOCAs) are critical initiating events for many PRA applications, the NRC has taken steps towards the quantification of LOCA frequencies for use in risk-informed applications. This research develops the Spatio-Temporal Probabilistic methodology to …
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Analysis of reverse flow restriction device to prevent fuel dryout during loss of coolant and instability accidents of boiling water reactors
… BWR instability and Loss of Coolant Accidents (LOCA). The method is based on a device called Reverse Flow Restriction Device (RFRD) and its purpose is to allow the flow in the forward direction, but prevent the flow in reverse direction which occurs in multiple accident scenarios. In this …
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EXPERIMENTAL STUDIES OF THE CHEMICAL EFFECTS OF ZINC-BEARING MATERIALS FOLLOWING A LOSS-OF-COOLANT ACCIDENT IN A PRESSURIZED WATER REACTOR
… strainers during a Loss-of-Coolant Accident (LOCA). Potential contributors to the debris loading include latent dirt, fiberglass insulation, paints, epoxies, and chemical products which form when containment surfaces interact with the released reactor coolant. Chemical effects experiments have …
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Machine Learning in Function Spaces
… of work with a new operator learning method, LOCA (Learning Operators with Coupled Attention). Inspired by the success of the attention mechanism, LOCA learns operators between function spaces by averaging features of the input function with a probability distribution that depends on the …
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Frustrated desire and controlling fictions : the natural world in ancient pastoral literature and art
… itself. The visuality of the descriptions of loca amoena is then compared with examples from Roman landscape wall painting, which provide fictional representations of plants that can physically create a space in which desires can be inspired, enunciated, or acted upon. Second, inversions of …
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Fuel performance of multi-layered zirconium and silicon carbide based Accident Tolerant Fuel claddings
… power ramp and loss-of-coolant accident (LOCA). The major finding is that the chromium coated concepts proved to be the most promising in both Zr4 and SiC based claddings. The three layered SiC cladding showed a high probability of failure during normal operation and transient conditions, …
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TRACE code validation of boiling water reactor spray cooling injection into a SVEA fuel assembly
… associated with Loss-of-Coolant Accident (LOCA) scenarios. Emergency spray cooling injection is a safety feature implemented in many Boiling Water Reactor (BWR) designs to re-flood a reactor during an accident. Significant experimental work has qualified the efficacy of spray cooling, and …
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Gas heat transfer in a heated vertical channel under deteriorated turbulent heat transfer regime
… circulation of gas after a loss of coolant (LOCA) accident is one of the major goals of the Gas-cooled Fast Reactor (GFR). Due to its high surface heat flux and low coolant velocities under natural circulation in post-LOCA scenarios, the capability of turbulent gas flow to remove heat from …
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Advanced thermal hydraulic simulations for human reliability assessment of nuclear power plants
… errors during a loss of coolant accident (LOCA) initiating event. The magnitude of the effect of the TH uncertainty on the operator's ability to recognize errors is dependent upon the size of the break, the operating state of the plant (in operation or shutting down), and the error that is …
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Silicon carbide oxidation in high temperature steam
… occur during a loss of coolant accident (LOCA), and may become autocatalytic beyond 1,200 0C, thus generating a large amount of hydrogen. The concern for the zircaloy oxidation reaction has been heightened since the March 2011 events of Fukushima, Japan. One solution offering promising …
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Evaluation of multilayer silicon carbide composite cladding under loss of coolant accident conditions
… are important during a loss of coolant accident (LOCA). To improve the performance of SiC cladding, a multilayered architecture consisting of layers of monolithic SiC (mSiC) and SiC/SiC ceramic matrix composite (CMC) has been proposed. In this work, the mechanical performance of both the tubing …
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Función de la Proteína PTTG1 en la Regulación de la Expresión del Gen dlk1 en procesos de Proliferación y Diferenciación Análisis funcional de las Isoformas PTTG1, PTTG2 y PTTG3
… 2. Dada la escasa información acerca de la loca lización subcelular de PTTG1, y teniendo en cuenta su implicación en el ciclo celular, otro objetivo de este trabajo ha sido determinar la localización subcelular de PTTG1 en distintas líneas celulares normales y tumorales y poder asociarla a …
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Development of a PSA-based safety assessment and management framework for nuclear-based hydrogen generation system.
… for Cu-Cl cycle. Two major safety challenges, LOCA and the hydrogen accidents, are analyzed in details with the PSA-based safety management framework. The PSA study shows that nuclear risks are effectively reduced by the reactor safety system, while the major risk is the hydrogen accidents. …
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High temperature steam oxidation of titanium-coated Zircaloy-2 and Titanium-Zirconium Alloys
… the reactor during a Loss-of -Coolant Accident (LOCA). The hydrogen, which collected in the reactor vessel and containment buildings, caused devastating hydrogen gas explosions which lead to the release of radioactive isotopes into the atmosphere. Cladding material for nuclear fuel pellets must …
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Risk-informed design changes for a passive cooling system
… of a passive decay heat removal system after a LOCA is evaluated as part of a risk-informed design process for a helium-cooled fast reactor. The system was modeled using RELAP5-3D. The epistemic uncertainties in input parameters as well as the epistemic model uncertainties in the code were …
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