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Study on ageing behavior of reprocessing plants, 5; Effect of surface temperature and solution boiling on corrosion behavior of stainless steel in nitric acid solution

Ueno, Fumiyoshi  ; Shiraishi, Hironori; Inoue, Shun; Motooka, Takafumi; Kato, Chiaki  ; Yamamoto, Masahiro ; Uchiyama, Gunzo ; Nojima, Yasuo*; Fujine, Sachio*

Effect of metal surface temperature and solution boiling on corrosion of stainless steel in boiling nitric acid solution at heating portion was studied to investigate ageing behavior of the components in spent fuel reprocessing plant. Corrosion tests under the conditions of heat transfer and immersion in atmospheric pressure were carried out using nitric acid solution including Vanadium. As the results, apparent activation energies of thermal dependences on corrosion rates of both the heat transfer and the immersion were indicated approximately 40 kJ/mol. Corrosion rate under the boiling condition were higher about 7 times for the non-boiling condition.

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