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Journal Articles

Development of fission product chemistry database ECUME for the LWR severe accident

Miwa, Shuhei; Miyahara, Naoya; Nakajima, Kunihisa; Nishioka, Shunichiro; Suzuki, Eriko; Horiguchi, Naoki; Liu, J.; Miradji, F.; Imoto, Jumpei; Mohamad, B. A.; et al.

Proceedings of 27th International Conference on Nuclear Engineering (ICONE-27) (Internet), 8 Pages, 2019/05

We constructed the first version of fission product (FP) chemistry database named ECUME for LWR severe accident. The first version of ECUME is equipped with dataset of the chemical reactions and their kinetics constants for the reactions of cesium(Cs)-iodine(I)-boron(B)-molybdenum(Mo)-oxygen(O)-hydrogen(H) system in gas phase, the elemental model for the high temperature chemical reaction of Cs with stainless steel, and thermodynamic data for CsBO$$_{2}$$ vapor species and solids of Cs$$_{2}$$Si$$_{4}$$O$$_{9}$$ and CsFeSiO$$_{4}$$. The ECUME will provide more accurate estimation of Cs distribution due to the evaluation of effects of interaction with BWR control material B and stainless steel on Cs behavior in the Fukushima Daiichi Nuclear Power Station.

Journal Articles

Experimental study on Cs chemisorption behaviour onto stainless steel at around 873 K

Suzuki, Eriko; Takase, Gaku; Nakajima, Kunihisa; Nishioka, Shunichiro; Hashimoto, Naoyuki*; Isobe, Shigehito*; Osaka, Masahiko

Proceedings of International Topical Workshop on Fukushima Decommissioning Research (FDR 2019) (Internet), 4 Pages, 2019/05

In order to acquire the knowledge of the Cs chemisorption behaviour in the lower temperature region, the Cs chemisorbed compounds and the surface reaction rates were investigated by conducting the Cs chemisorption tests onto stainless steel at 873 and 973 K. As a result, The cesium ferrate compounds were revealed to be formed at this temperatures. It was seen that the dependences of surface reaction rate constant on this temperature were different from that at the higher temperature region. This behaviour leads to the conclusion that the Cs chemisorption model in the low temperature region should be newly constructed.

Oral presentation

FP chemistry in a high temperature region of LWR under a severe accident, 2; Analysis of reaction product between Boron vapor species and stainless steel at high temperature

Takase, Gaku; Suzuki, Eriko; Imoto, Jumpei; Nakajima, Kunihisa; Miwa, Shuhei; Ogawa, Hiroaki; Osaka, Masahiko

no journal, , 

A chemical reaction experiment between boron vapor, which is from BWR control material, and stainless steel at high temperature was conducted under the condition in nuclear reactor cooling system during LWR severe accident. It was found from the analysis of reaction products that boron may chemically react with iron at the surface of stainless steel and adhere as Fe-B-O compounds over 940 K.

Oral presentation

Cs chemisorption behavior onto stainless steel during LWR severe accident, 2; Property change of Cs-chemisorbed deposit by temperature increase

Nishioka, Shunichiro; Takase, Gaku; Nakajima, Kunihisa; Suzuki, Eriko; Osaka, Masahiko

no journal, , 

The chemical/physical properties of Cs-chemisorbed deposit could change along with the progression of LWR severe accident (SA). In this study, the influence of temperature change on the properties of Cs-chemisorbed deposit was investigated experimentally. It was found that Cs-Fe-O compounds, which had been formed by chemisorption at 873 K, could transform into Cs-Si-(Fe)-O compounds at 1273 K.

Oral presentation

Cs chemisorption behaviour onto stainless steel during LWR severe accident, 1; Experimental study on Cs chemisorption behaviour at temperature around 600$$^{circ}$$C

Suzuki, Eriko; Takase, Gaku; Nakajima, Kunihisa; Nishioka, Shunichiro; Osaka, Masahiko

no journal, , 

In order to estimate the cesium (Cs) distribution in the reactor pressure vessel under severe accident (SA), Cs chemisorption behaviour onto stainless steel have been investigated. In our previous study on Cs chemisorption behaviour at above 800$$^{circ}$$C, it was found that the Cs silicate compounds were formed as Cs chemisorbed compounds. In this study, Cs chemisorption tests at lower temperatures around 600$$^{circ}$$C were carried out to investigate the Cs chemisorbed compounds at lower temperatures. As a result, cesium ferrate compounds were formed and it was suggested that the chemical reaction at lower temperatures would be different from that at above 800$$^{circ}$$C.

Oral presentation

Fission product chemistry database ECUME

Imoto, Jumpei; Miwa, Shuhei; Miyahara, Naoya; Nakajima, Kunihisa; Nishioka, Shunichiro; Suzuki, Eriko; Horiguchi, Naoki; Liu, J.; Miradji, F.; Mohamad, A.; et al.

no journal, , 

Fission product (FP) chemistry database ECUME (Effective Chemistry database of fission products Under Multiphase rEaction) consists of three kinds of datasets: CRK (dataset for Chemical Reaction Kinetics), EM (Elemental Model set) and TD (ThermoDynamic dataset). The present ECUME is equipped with the CRK for the reaction of Cs-I-B-Mo-O-H system in gas phase, the EM for the Cs chemical reaction with stainless steel (SS) (Cs chemisorption onto SS) and the TD for CsBO$$_{2}$$ vapor species and solid Cs$$_{2}$$Si$$_{4}$$O$$_{9}$$ and CsFeSiO$$_{4}$$. The Cs chemisorption behavior model has successfully reproduced the effects of CsOH vapor concentration in gas phase and Si content in SS on the Cs chemisorption behavior which were not able to be considered by the existing model. The ECUME are expected to contribute to more accurate evaluation of FP distribution in Fukushima Daiichi Nuclear Power Station.

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