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Uchibori, Akihiro; Aoyagi, Mitsuhiro; Ito, Kei*; Takata, Takashi; Ohshima, Hiroyuki
no journal, ,
Development of the multi-scenario simulation systems for in-vessel/ex-vessel phenomena under severe accident in sodium cooled fast reactor is important issue. In this study, the basic modules for in-vessel/ex-vessel thermal hydraulics analysis were developed. The in-vessel basic module could evaluate phenomenon of coolant leakage in primary cooling system successfully. The ex-vessel basic module was validated through comparison to the analysis results by the other code or theoretical solutions.
Uchibori, Akihiro; Aoyagi, Mitsuhiro; Sonehara, Masateru; Takata, Takashi; Ohshima, Hiroyuki
no journal, ,
The multi-level, multi-scenario simulation systems have been developed as a fundamental technology of sodium-cooled fast reactors. In this study, a multi-scenario simulation system for in- and ex-vessel phenomena during a severe accident was newly developed. The validity of the system was confirmed through the analysis of a Loss-Of-Reactor-Level (LORL) event.
Uchibori, Akihiro; Takata, Takashi; Fukano, Yoshitaka; Yamano, Hidemasa
no journal, ,
The development of ARKADIA-Safety for safety evaluation and design optimization considering severe accident was started. This development includes improvement and applicability expansion of the in- and ex-vessel analysis code, SPECTRA. Furthermore, optimization of the containment vessel considering severe accident will be performed as an example application of ARKADIA-Safety.
Miwa, Shuhei; Horiguchi, Naoki; Miyahara, Naoya*; Nakajima, Kunihisa; Suzuki, Eriko; Imoto, Jumpei; Liu, J.; Karasawa, Hidetoshi; Osaka, Masahiko
no journal, ,
We developed the fission product chemistry database named ECUME (
ffective 
hemistry database of fission products 
nder 
ultiphase raction) for the LWR severe accident. The dataset for chemical reaction kinetics of ECUME consists of main chemical reactions and their effective chemical reaction kinetic constants. This dataset has the advantages in kinetics evaluation of the effects of molybdenum and BWR control material boron on cesium and iodine chemistry. This can improve prediction accuracy of chemical forms and their fraction in lower temperature region such as a primary containment vessel and a reactor building.
Suzuki, Eriko; Nakajima, Kunihisa; Nishioka, Shunichiro*; Miwa, Shuhei; Horiguchi, Naoki; Imoto, Jumpei; Liu, J.; Karasawa, Hidetoshi; Osaka, Masahiko
no journal, ,
The elemental model set (EM) of ECUME consists of improved models which can be directly incorporated into the present severe accident analysis codes. The models of EM has advantages in considering various chemical conditions. The improved model for cesium (Cs) chemisorption has successfully reproduced the effects of Cs vapor concentration in gas phase and silicon content in stainless steel on the Cs chemisorption behavior. This improved model can contribute to more accurate estimation of Cs distribution in a high temperature area.
Uchibori, Akihiro; Aoyagi, Mitsuhiro; Sonehara, Masateru; Sogabe, Joji; Okano, Yasushi; Takata, Takashi*
no journal, ,
The ARKADIA-Safety for safety evaluation and design optimization considering severe accident has been developed. This paper presents validation of sodium fire analysis model and integration of ex-vessel analysis model for improvement of the evaluation method.