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Corrosion phenomenon of stainless steel in boiling nitric acid solution using large-scale mock-up of reduced pressurized evaporator

ステンレス鋼製減圧式蒸発缶の大型モックアップ試験による沸騰硝酸中の腐食現象

上野 文義  ; 加藤 千明   ; 本岡 隆文; 市川 史郎*; 山本 正弘 

Ueno, Fumiyoshi; Kato, Chiaki; Motooka, Takafumi; Ichikawa, Shiro*; Yamamoto, Masahiro

使用済核燃料再処理施設の機器の寿命評価のため、減圧式サーモサイフォン型蒸発缶の大型モックアップ試験装置を用いて約36,000時間の腐食試験を行い、極低炭素304系ステンレス鋼製の伝熱管の沸騰硝酸溶液中の腐食機構を検討した。その結果、粒界侵食と脱粒が交互に起こるときに腐食量と腐食速度の増加傾向が飽和し、一定の速度で腐食が進行した。この結果は寿命評価に対して直線予測が適用可能であることを意味する。観察した位置の異なる3か所の腐食量が異なるにもかかわらず粒界侵食深さに違いは見られなかった。また、腐食量は主として伝熱管表面の温度と熱流束に支配されることが明らかとなり、最大の腐食量は伝熱管表面温度の高い沸騰開始点と管の上端で認められた。

For purpose of life prediction of components in spent nuclear fuel reprocessing plants, corrosion test was performed about 36,000 hours using a large scale mock-up test apparatus of a reduced pressurized thermosiphon evaporator, and a corrosion mechanism of heat transfer tube made of an ultra-low carbon type 304 stainless steel in boiling nitric acid solution was studied. As the results, the tendencies of increases of amount of corrosion and corrosion rate were saturated when intergranular penetration and grain dropping occurred in turn. This result means that a linear estimation can be applied to the life prediction for corrosion. No difference in morphologies of intergranular corrosion existed among three portions could find even though amounts of corrosion were different. The amount of corrosion was dominated by tube surface temperature and heat flux. And the largest amount of corrosion could be seen at boiling starting portion and the top where indicated highest values of tube surface temperatures.

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パーセンタイル:59.25

分野:Nuclear Science & Technology

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