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Journal Articles

Revaporization behavior of cesium and iodine compounds from their deposits in the steam-boron atmosphere

Rizaal, M.; Miwa, Shuhei; Suzuki, Eriko; Imoto, Jumpei; Osaka, Masahiko; Gou$"e$llo, M.*

ACS Omega (Internet), 6(48), p.32695 - 32708, 2021/12

Oral presentation

Estimation of Cs distribution and characteristics in the reactor under severe accident, 5; Summary

Miwa, Shuhei; Karasawa, Hidetoshi; Kino, Chiaki*; Nakajima, Kunihisa; Suzuki, Eriko; Imoto, Jumpei

no journal, , 

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.

Oral presentation

Estimation of Cs distribution and characteristics in the reactor under severe accident, 1; Evaluation of amount of chemisorbed Cs in the reactor

Karasawa, Hidetoshi; Miwa, Shuhei; Kino, Chiaki*

no journal, , 

Amount of CsOH chemisorbed on surfaces of structural materials such as separators and dryers in unit1, unit2, unit3 were evaluated by the SAMPSON code under the Fukushima Daiichi Nuclear Power Plant severe accident conditions. Concentrations of CsOH vapors are decreased due to reaction with Mo vapors and to produce aerosols under decreasing gas temperature. As an existing chemisorption model is independent on CsOH concentrations, an ECUME has developed a new chemisorption model with a function of CsOH concentrations and gas temperature. Cs absorbed amounts were changed unit by unit due to different CsOH concentrations and gas temperature. Evaluation of CsOH chemisorption in a SA analysis needs the new chemisorption model with dependency of CsOH concentrations.

Oral presentation

Estimation of Cs distribution and characteristics in the reactor under severe accident, 3; Chemical forms of Cs chemisorbed products

Suzuki, Eriko; Nakajima, Kunihisa; Miwa, Shuhei; Osaka, Masahiko; Hashimoto, Naoyuki*; Isobe, Shigehito*; Oka, Hiroshi*

no journal, , 

In order to evaluate the properties of chemisorbed cesium (Cs) onto the structural materials in nuclear reactors during severe accidents, temperature dependency of the chemical forms of Cs chemisorbed compounds was investigated based on the compilation of previous studies, the simulation tests of Cs chemisorption onto stainless steel, the acquisition of thermodynamic data and the thermodynamic equilibrium calculations, and the microstructure observation of chemical forms inside the oxide layer. It was revealed that the different Cs chemisorbed compounds were formed depending on the temperature conditions, such as Cs-Fe-O at 873-973 K, Cs-Fe-Si-O at 973-1273 K and Cs-Si-O at 1073-1273 K.

Oral presentation

Estimation of Cs distribution and characteristics in the reactor under severe accident; Chemical forms of Cs chemisorbed compounds

Suzuki, Eriko; Nakajima, Kunihisa; Miwa, Shuhei; Osaka, Masahiko; Hashimoto, Naoyuki*; Isobe, Shigehito*; Oka, Hiroshi*

no journal, , 

In order to evaluate the properties of chemisorbed cesium (Cs) onto the structural materials in nuclear reactors during severe accidents, temperature dependency of the chemical forms of Cs chemisorbed compounds was investigated based on the compilation of previous studies, the simulation tests of Cs chemisorption onto stainless steel, the acquisition of thermodynamic data and the thermodynamic equilibrium calculations, and the microstructure observation of chemical forms inside the oxide layer. It was revealed that the different Cs chemisorbed compounds were formed depending on the temperature conditions, such as Cs-Fe-O at 873-973 K,Cs-Fe-Si-O at 973-1273 K and Cs-Si-O at 1073-1273 K.

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