2021 Annual Meeting

Presentation information

Oral presentation

V. Nuclear Fuel Cycle and Nuclear Materials » 503-1 Reactor Chemistry, Radiation Chemistry, Corrosion, Water Chemistry,Water Quality Control

[3G01-05] Behavior of Radioactive Nuclides & Fuel Debris 1

Fri. Mar 19, 2021 9:30 AM - 11:00 AM Room G (Zoom room 7)

Chair: Shunsuke Uchida (JAEA)

10:30 AM - 10:45 AM

[3G05] Estimation of Cs distribution and characteristics in the reactor under severe accident


*Shuhei Miwa1, Hidetoshi Karasawa1, Chiaki Kino2, Kunihisa Nakajima1, Eriko Suzuki1, Junpei Imoto1 (1. JAEA, 2. IAE)

Keywords:Cesium, Chemisorption, Stainless steel, Water solubility, ECUME, SAMPSON

We investigated the Cs distribution and characteristics in the upper structure of the reactor pressure vessel in TEPCO Fukushima Daiichi Nuclear Power Station (1F) based on the data on the amount of Cs chemisorbed compound onto stainless steel in the upper structure calculated by severe accident analysis code SAMPSON with improved Cs chemisorption model, the chemical form and water solubility of Cs chemisorbed compounds obtained by experiments which are prerequisite for the evaluation of long-term behaviors. The results indicate that the amount of insoluble Cs chemisorbed compounds can be lower than that estimated by using existing Cs chemisorption model.