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ray irradiation on deoxidation in aqueous solution by addition of hydrazineMotooka, Takafumi; Sato, Tomonori; Yamamoto, Masahiro
no journal, ,
The effect of ray irradiation on deoxydation in aqueous solution by hydrazine was investigated using pure water and artificial sea water at room temperature. Concentration of dissolved oxygen was not decreased without ray irradiation, while concentration of dissolved oxygen was markedly decreased for one hour ray irradiation. It is believed that the small hydrazine addition to spent nuclear fuel pool water is effective as a method for decreasing concentration of dissolved oxygen.
Yamamoto, Masahiro; Komatsu, Atsushi; Motooka, Takafumi
no journal, ,
As sea water was introduced into spent nuclear fuel pool (SFP) for emergency cooling of Fukushima Dai-ichi Nuclear Power Plant, it was wondered that corrosion problems of zircaloy as cladding materials. Then, corrosion behaviors of zircaloy-2 were examined. The results showed re-passivation potential and crevice potential were nobler than that of rest potential in the solution diluted 1/8 sea water and below 80
C. It means localized corrosion is inhibited in these conditions. Next we will examine the actual cladding materials for confirming the effect of oxide layer and hydride.
C pure waterSoma, Yasutaka; Kato, Chiaki; Yamamoto, Masahiro
no journal, ,
Surface oxide layers on stainless steel were formed in 288C pure water at different potentials. To understand the oxide's properties in terms of their potential dependence, cross-sectional views of the oxide layer were analyzed using an electron microprobe technique and potential-solubility (equilibrium concentration of ionic species) diagram. In the potential range investigated, duplex oxide layers composed of mono- and bimetallic oxide were formed. Both the structure and composition of the oxide layer were affected by solubility of oxides.