[3J10-12] Thermal-hydraulics Numerical Simulation

[3J12] Development of multi-dimensional melt spreading behavior analysis code MSPREAD

Code structure and validation based on simulant test data

*Akitoshi Hotta¹, Miyuki Akiba¹, Yuki Doi¹ (1. Regulatory Standard and Research Department, Secretariat of Nuclear Regulation Authority )

Keywords:Severe accident, melt spreading, MCCI, Cavity, THERMOS

A simulation code for hot molten material spreading behavior, MSPREAD, is under development as a module of THERMOS. The momentum equation is expressed by the shallow pool model to deal with two-dimensional spreading bahaviors. Models of viscosity increase caused by solidification, crust formation and heat transfer heat removal are implemented. Validation results based on simulant tests data will be shown.