[2J05-08] FP Behavior/Nuclear Disaster Prevention

[2J05] Evaluation of FP Behavior Models in SAs

(3) Evaluation of aerosol deposition models and a CsOH revaporaization model in SA codes

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

Keywords:re-vaporization, CsOH, aerosol formation, aerosol deposition, Phebus FPT1 experiment, SAMPSON code

Re-vaporization of CsOH in primary system was observed after a core shutdown in the Phebus FPT1 experiment. This behavior was examined using the SAMPSON code with the model of aerosol formation. The re-vaporization behavior was confirmed in the analysis, that is, deposited CsOH was evaporated when the vapor concentration became less than the saturated concentration and re-deposited in simulated steam generator walls with the lower temperature. As to FPs other than CsOH, the amount of each FP deposited in the simulated steam generator was found to be proportion to the FP component of aerosols as expected in the aerosol formation model.