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Transient heat transfer characteristics between molten fuel and steel with steel boiling in the CABRI-TPA2 test

Yamano, Hidemasa   ; Onoda, Yuichi ; Tobita, Yoshiharu; Sato, Ikken 

In the TPA2 test of the CABRI-RAFT program which is part of a fast reactor safety study, fuel-to-steel heat transfer characteristics within a molten fuel/steel mixture system were investigated. This test was performed in the French CABRI reactor and used a test capsule containing fresh 12.3% enriched UO$$_{2}$$ pellets with embedded stainless steel balls. Following a pre-heating phase, the capsule was subjected to a transient overpower resulting in fuel melting and steel vaporization. The observed steel vapor pressure build-up was quite low suggesting presence of a mechanism significantly limiting the fuel-to-steel heat transfer. A detailed experimental data evaluation by SIMMER-III led to one possible interpretation that the steel vaporization at the surface of the steel ball blanketed the steel from the molten fuel.

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Category:Nuclear Science & Technology

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