Development of Mechanistic Core Degradation Analysis Code and Plan for Validation Experiments toward the Regulation of Fukushima Daiichi NFS

摘要

To prevent a criticality accident at the Fukushima Daiichi Unit 1-3, JNES have started development of mechanistic Core Degradation Analysis (CDA) code since 2011. The current research activity for the criticality problem is not enough in LWR Severe Accident (SA) research fields. In order to support the criticality regulation, more precise thermo-hydraulics analysis code strongly coupled with neutronics is indispensable. The objective of this project is to develop neutronic, thermal hydraulic and fuel behavior tight coupling model. Furthermore, the project will be conducted not only code development but also validation experiments.