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Descripción
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| Severe accidents in nuclear power plants are still an active field in containment safety research because of their complex phenomenology, their wide range of consequences and the uncertainty involved in the computational modeling. The main contributors to this difficulty are the potential harsh conditions in the containment due to hydrogen combustion, Direct Containment Heating (DCH), Molten Corium-Concrete Interaction (MCCI) or steam explosions. Regarding hydrogen, large quantities of this non-condensable gas can be generate1d during a severe accident, and this hydrogen can react with oxygen in a hazard-ous reaction. Depending on the combustion regime, the reaction can be more or less dangerous, more-over, during this reaction, the instrumentation survivability limits can be surpassed during the sequence. As containment instrumentation is licensed based on the pressure and temperature increase after a mass and energy release of a design basis accident, accident phenomena like hydrogen deflagrations, DCH, MCCI or steam explosions are not taken into account on its design limits. For this reason, if any of these phenomena occurs, it is likely that the pressure or temperature range of the containment in-strumentation is surpassed, and therefore, their measures cannot be trusted during the remaining acci-dent development. For this reason, a computational simulation of a SA that takes into account the possible degradation of the instrumentation due to pressure-temperature sequences in a 3 loop PWR-W containment is made. The computational simulation is performed with a model with the containment subdivided to take into account the transient local conditions near each instrument. The simulations show that this kind of sequences could impair critical instruments needed for the man-agement of the accident. Depending of the instrument availability, different alternatives are suggested that can be taken into account to manage the accidental sequence. | |
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Internacional
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Si |
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Nombre congreso
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International Congress on Advances in Nuclear Power Plants 2019 |
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Tipo de participación
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960 |
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Lugar del congreso
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Juan des pines, France |
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Revisores
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ISBN o ISSN
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DOI
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Fecha inicio congreso
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12/05/2019 |
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Fecha fin congreso
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15/05/2019 |
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Título de las actas
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