抄録
The reprocessing of spent fuel is based on the chemical process of extraction. In terms of risk analysis, the solvent of tributyl phosphate and kerosene is well-known to be a combustible liquid whose flash point and fire point can be about 70°C. Therefore, the solvent fire is considered to be an important postulated accident at a reprocessing plant even if its probability is low. When the solvent burned, aerosols and radioactive substances were released and diffused inside the facility. In a solvent fire, it is also necessary to calculate accurately thermofluid behavior in the ventilation system and heat transfer to the wall and tube. For analyzing the thermodynamic and radiological consequences of solvent fire accidents in reprocessing plants, experiment on burning contaminated liquids was performed at Pacific Northwest Laboratory (PNL), Japan Atomic Energy Research Institute (JAERI), Kernforschungszentrum Karlsruhe (KfK), Cadarache Nuclear Research Center (CNRC). Due to the high concentration of fission products and large amount of nuclear fuel materials in the extraction process, the solvent fire as one of the severe accidents in spent fuel reprocessing facilities was supposed to be investigated.
