高速炉燃料再処理の溶解槽模擬環境におけるステンレス鋼の伝熱面腐食挙動

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  • Corrosion behavior of stainless steels under heat transfer condition in simulated solution of dissolver for FBR fuel reprocessing.
  • コウソクロ ネンリョウ サイショリ ノ ヨウカイソウ モギ カンキョウ ニ オ

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Corrosion tests have been carried out in a simulated solution under heat transfer condition, in order to investigate the influence of boiling and NOx gas injection on the corrosion of austenitic stainless steels for the dissolvers of FBR fuel reprocessing plants.<BR>A simulated solution consisted of 4N nitric acid containing several non-radioactive ions. A specially designed heat transfer test cell could provide the precise control of heat flux. The test results are as follows:<BR>(1) Corrosion rates of both base metals and weld metals increased with heat flux under heat transfer condition.<BR>(2) Severer intergranular corrosion occurred on SW 310 weld metal. The maximum depth of the attack was larger than that of 310Nb base metal.<BR>(3) NO gas injection inhibits effectively the corrosion under non-boiling condition than boiling condition. The corrosion potential after stopping NO gas injection rapidly recovered under boiling condition.<BR>(4) Corrosion rates increased with the surface temperature of metal under both boiling and non-boiling conditions, but it should be noted that Arrhenius plot for boiling condition becomes higher than that for non-boiling condition in spite of the same surface temperature.<BR>As a result, it is demonstrated that boiling phenomenon is dominant factor rather than the surface temperature of metal in boiling condition.

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