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Hidaka, Akihide
Fission Product Behavior under Severe Accident, p.85 - 88, 2021/05
no abstracts in English
Miwa, Shuhei; Osaka, Masahiko
no journal, ,
JAEA have launched a new research program for the evaluation of fission product chemistry under the severe accident. In this program, chemical form of fission product and release kinetics at the each condition such as release from fuel, transport in the reactor pressure vessel, reactor coolant system, primary containment vessel will be evaluated to clarify the cesium and iodine chemistry in BWR system under the severe accident. JAEA starts the development of experimental and analytical technologies, and acquiring the experimental data using simulant FP materials. For the evaluation of release kinetics, the empirical CORSOR-M model was improved so as to evaluate the effects of atmospheres.
Takai, Toshihide; Nakajima, Kunihisa; Furukawa, Tomohiro; Osaka, Masahiko
no journal, ,
Improvement of the serve accident analysis code is important to evaluate the distribution of the released fission products (FPs) in the reactor more precisely from the view point of both the removal preparation of the fuel debris in the Fukushima Daiichi Nuclear Power Station and improved source term evaluation. The development of the calculation model, which can evaluate the effect of atmosphere and the chemical reaction between the released FPs and control rod material (B
C) at elevated temperature, is important for this purpose. The measurement technique of the equilibrium vapor pressure using a high temperature mass spectrometer was under development to expand the thermodynamic database of the simulated FPs, because the chemical equilibrium analysis plays an important role to clarify the effect of chemical reactions. In this study, the apparatus was developed for the equilibrium vapor pressure measurements, and then the reliability of measurement results was evaluated.