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Liu, J.; Miyahara, Naoya; Miwa, Shuhei; Takano, Masahide; Osaka, Masahiko
no journal, ,
To improve the ruthenium (Ru) release model from a nuclear fuel in a severe accident, we investigated the oxidation and vaporization behaviors of Mo-Ru-Pd-Rh alloy powders, and the results show that the oxygen potential around the powders is controlled by the Mo/MoO
couple and the vaporization rate of Ru linearly increases with an increase of the overall equilibrium partial pressure of various produced ruthenium oxide gases.
Suzuki, Eriko; Nakajima, Kunihisa; Osaka, Masahiko; Oishi, Yuji*; Muta, Hiroaki*; Kurosaki, Ken*
no journal, ,
In LWR severe accident condition, Cesium(Cs)-silicates (CsFeSiO
, CsSiO
, CsSiO
) could be formed by Cs chemisorption onto reactor structural materials. For evaluation of chemisorption/re-vaporization behaviour, thermal property of each Cesium-silicates were investigated by low temperature heat capacity measurement. As a result, actual measurement values of standard entropy, which have evaluated by estimate values, were obtained. Especially for CsSiO, more reliable value of standard formation Gibbs energy was able to be evaluated.
Miradji, F.; Suzuki, Chikashi; Nakajima, Kunihisa; Osaka, Masahiko
no journal, ,