Sensitivity study of thermal-hydraulic nodalization for MELCOR simulations of severe accidents in a pressurized water reactor

Nan Zhao,Yangli Chen,Weimin Ma,Sevostian Bechta

Annals of Nuclear Energy（2022）

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摘要

•Three CVH nodal schemes are constructed and compared in MELCOR simulations.•The refined CVH nodal scheme tends to predict the faster core relocation, earlier RPV failure and more hydrogen release.•The natural circulation in the core region can be observed in the refined CVH nodal scheme.•The CVH nodalization has limited effect on fission product release.

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关键词

Severe accident,Numerical simulation,MELCOR code,Sensitivity study

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