[2F03-06] Behavior of FP and Fuel Debris

[2F05] Evaluation of FP behavior models in Severe Accidents

1. Evaluation of effect of nucleation on deposition of FP aerosols in a primary system by the Phebus-FPT1 test analysis

*Hidetoshi Karasawa¹, Shuhei Miwa¹, Chiaki Kino² (1. JAEA, 2. IAE)

Keywords:severe accident, FP behavior model, aerosol, nucleation, coagulation, deposition

Oversaturated vapors released in a core in SAs change to monomers which produce clusters due to homogeneous or heterogeneous nucleation. In a primary system, clusters coagulate each other to grow particle sizes. Effects of the nucleation and coagulation on deposition of FP aerosols in the primary system were examined by the Phebus FPT1 analysis using the SAMPSON code.