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再処理施設における経年変化研究,5; 硝酸溶液中ステンレス鋼腐食に対する表面温度と沸騰挙動の影響

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

上野 文義  ; 白石 啓宜; 井上 峻; 本岡 隆文; 加藤 千明  ; 山本 正弘 ; 内山 軍蔵 ; 野島 康夫*; 藤根 幸雄*

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

再処理施設の経年変化に関する研究として、ステンレス鋼製機器の硝酸加熱沸騰部を対象に、腐食速度に及ぼす金属表面温度と溶液沸騰挙動の影響を調べた。Vを添加した硝酸溶液を用いた浸漬及び伝熱面腐食試験を常圧下にて実施した結果、伝熱面及び浸漬のいずれの場合も、温度依存性を示す活性化エネルギーは同じ約40kJ/molを示し、沸騰条件では非沸騰に対して腐食速度が約7倍大きくなることがわかった。

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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