[2I07-09] FP and Diffusion

[2I08] Evaluation of Fission Products Released during the NPP Severe Accident

24. Validation of the analytical results on FP behavior in the Unit 2 by comparing with CAMS data

*Shunsuke Uchida¹, Hidetoshi Karasawa¹, Chiaki Kino¹, Marco Pellegrini¹, Masao Chaki¹, Masanori Naito¹ (1. Institute of Applied Energy)

Keywords:nuclear power plant, severe accident, source term, fission product, CAMS, environmental pollution

Dose rates at CAMS positions were evaluated based on the analytical results of Cs amounts in the PCV and the S/C of the Unit 2 with the SAMPSON code, and compared with measured CAMS data. As the amounts of Cs and I transfered to the S/C in the Unit 2 were larger than those in the Unit 1, the dose rates at the CAMS positions were larger. The decreases of the CAMS data with time could be explained by assuming Cs contained water droplets falled to the pool as in the unit 1. The Cs behavior in the PCV is necessary to consider transfer from a pedestal to the upprt part in the PCV.