Publicou 6 edições por ano
ISSN Imprimir: 1543-1649
ISSN On-line: 1940-4352
Indexed in
SOLVING COUPLED PROBLEMS OF LUMPED PARAMETER MODELS IN A PLATFORM FOR SEVERE ACCIDENTS IN NUCLEAR REACTORS
RESUMO
Coupled problems of lumped parameter models are of interest for the simulation of severe accidents in nuclear reactors at system levels. These coarse-grained models allow for both quick statistical analysis used for risk assessment and solutions of large problems when considering the whole severe accident scenario. However, this modeling approach has several numerical flaws. In this industrial context, computational efficiency is of great importance, leading to various numerical constraints. The objective of this research is to analyze the applicability of explicit coupling strategies to solve such coupled problems and to design implicit coupling schemes allowing stable and accurate computations. The proposed schemes are theoretically analyzed and tested within CEA's PROCOR platform on a problem of heat conduction and ablation that is representative of severe accidents in light water reactors. This problem is solved with coupled 0D lumped parameter models and coupled 1D models. Numerical results are discussed about the benefits of using the designed coupling schemes instead of the usual explicit coupling schemes.
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