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Journal Articles

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

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

Mechanical Engineering Journal (Internet), 7(3), p.19-00537_1 - 19-00537_11, 2020/06

We constructed the fission product (FP) chemistry database named ECUME for LWR severe accident. This 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 applied as the structural material in a reactor, and thermodynamic data for CsBO$$_{2}$$ vapor species and solids of Cs$$_{2}$$Si$$_{4}$$O$$_{9}$$ and CsFeSiO$$_{4}$$ for these chemical reactions. The ECUME will provide 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

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; Afiqa, B. M.; 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.

Oral presentation

FP chemistry in a high temperature region of LWR under a severe accident, 7; Surface analyses of Strontium compounds chemisorbed onto Stainless steel 304

Afiqa, B. M.; Nakajima, Kunihisa; Miwa, Shuhei; Osaka, Masahiko; Oishi, Yuji*; Muta, Hiroaki*; Kurosaki, Ken*; Yamanaka, Shinsuke*

no journal, , 

The release of Sr from fuel would be enhanced by the formation of volatile SrCl$$_{2}$$ in case of seawater injection into the core like as Fukushima Dai-ichi Nuclear Power Plant severe accidents. Since these volatile Sr vapor species can chemically react with stainless steel (SS) at high temperature, the chemisorption behavior is important in evaluating the Sr distribution in the reactor. Therefore, in order to verify the chemisorption behavior of SrCl$$_{2}$$ (generated by seawater injection) vapor species onto SS 304, chemical adsorption by the experiment was carried out and the compound formed on the SS 304 surface was analyzed. As a result, it was found a stable Sr/Si/O compound was formed on the surface of SS 304.

Oral presentation

Fundamental research on FP chemistry; Boron effects on cesium and iodine chemistry

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

no journal, , 

We have been conducting the fundamental study on fission product (FP) chemistry under severe accident (SA) conditions. The objective is to construct the FP chemistry database and to improve FP chemistry model for the improvement of source term evaluation technology. We have established the technical basis, such as experimental set-up and analysis tool, for the evaluation of FP chemistry in SA conditions. Fundamental knowledges on the effects of boron on the cesium and iodine chemistry were also obtained.

Oral presentation

Chemical interaction between Sr compounds and Zircaloy

Afiqa, B. M.; Nakajima, Kunihisa; Nishioka, Shunichiro; Miwa, Shuhei; Osaka, Masahiko

no journal, , 

In the accident of Fukushima Daiichi Nuclear Power Station, release of Sr from fuel would be enhanced by formation of volatile SrCl$$_{2}$$ and chemical reaction of Sr onto reactor structural material such as Zircaloy (Zry) would occur. Then, chemical interaction between Sr related compounds and Zry were investigated to elucidate such a chemical behavior. As a result, SrCl$$_{2}$$ vapor does not directly react with Zry at 1273 K.

Oral presentation

High temperature chemical reaction of strontium vapor species with Stainless steel

Afiqa, B. M.; Nakajima, Kunihisa; Miwa, Shuhei; Osaka, Masahiko; Oishi, Yuji*; Muta, Hiroaki*; Kurosaki, Ken*

no journal, , 

The release of strontium (Sr) from a fuel would be enhanced by the formation of volatile SrCl$$_{2}$$ in case of seawater injection into the core of Fukushima Dai-ichi Nuclear Power Plant. We investigated the chemisorption behavior of releasing SrCl$$_{2}$$ vapor onto type 304 stainless steel. It was observed that stable Sr-Si-O compounds were formed on the stainless steel surface.

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.; Afiqa, B. M.; 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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