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Report No.

Modelling of Cs chemisorption behaviour under LWR severe accident

Nishioka, Shunichiro; Nakajima, Kunihisa  ; Suzuki, Eriko   ; Miradji, F.; Osaka, Masahiko  

In order to contribute to Cs distribution analysis in Fukushima Daiichi Nuclear Power Station reactors by using severe accident analysis code, the influence of chemical factors (temperature, atmosphere etc.) on the Cs chemisorption behaviour onto stainless steel was investigated experimentally. An improved Cs chemisorption model was then established considering the effect of chemical factors obtained by the experiment. The accuracy of the present model is greatly improved by 1 order of magnitude compared with that incorporated in the existing SA codes.



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