Test and code development for evaluation of sodium fire accidents in the FBRs

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大野 修司  ; 川田 耕嗣; 森川 智; 姫野 嘉昭

Ohno, Shuji; Kawata, Koji; Morikawa, Satoshi; Himeno, Yoshiaki

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Code development and experimental researches have been carried out for more realistic evaluation of the sodium fire accidents in the FBRs. A three-dimensional sodium fire analysis code,SOLFAS, is under development, SOLFAS consists of many calculational models for the detailedsodium fire analysis. Among the models,those of turbulent heat-mass transfer in an atmospheric gas,sodium pool combustion, and thermal conduction in heat structures havebeen developed to date. The gas solver including the turbulence model was verified with the sample calculations. Combustion rates of a low temperature sodium pool in a low oxygen concentration atmosphere and those of a sodium columnar fire in an air atmosphere were obtained from the experiments conducted in the SAPFIRE facility at PNC. Derived empirical formulae of the sodium combustion rate will contribute to the code development in the near future.