SIMMER-Vコードの詳細燃料ピンモデルの開発と検証

抄録

The SIMMER-V code is being developed in cooperation between Japan and France to enable a consistent analysis of core disruptive accidents (CDA) from the initiating phase to transition phase and to be applicable to various types of cores in the evaluation of CDA in sodium-cooled fast reactors (SFRs). The main subject of the SIMMER-V development is to develop a new detailed fuel pin model to simulate the fuel pin behavior from accident initiation to fuel pin failure. This paper describes the development of verification of the fuel pin model, which is designed to be able to handle an axial heterogeneous core configuration and an annular fuel pellet. Along a verification matrix, in this study, the pin model addressing five physical phenomena (thermal behavior, fission gas release, fission gas swelling, mechanical deformation, and in-pin fuel motion) has been verified in comparison with existing initiating phase simulation code, thereby improving the reliability of SIMMER-V as a safety assessment tool for SFRs.