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炭酸ガス冷却炉におけるオーステナイト系炉心材料の腐食に関する調査・検討

The survey and evaluation of oxidation for core material of the austenitic stainless steels in carbon dioxide gas-cooled reactor

水田 俊治; 上平 明弘; 鵜飼 重治

Mizuta, Shunji; not registered; not registered

実用化戦略調査研究において炭酸ガス冷却炉の炉心材料としてオーステナイト鋼を用いる場合には、炭酸ガスによる腐食を評価しておく必要がある。そのため、オーステナイト鋼の炭酸ガス腐食特性等に関する文献について調査し、炭酸ガス腐食に影響を与える因子について評価した上でデータの選定を行い、PE16、20Cr/25Ni/Nb、18Cr-8Ni及びJNC材について炭酸ガス腐食式を策定した。オーステナイト鋼の炭酸ガス腐食式は放物線則に従うとして文献データの上限式によって、表すことにした。炭酸ガス腐食データのないJNC材(PNC316, PNC1520, 14Cr-25Ni)については、Fe-Cr-Ni系において重量減少の等しい領域にある18Cr-8Ni鋼をベースにして、炭酸ガス腐食に影響を与える因子の最も大きいと考えられるSi添加量の影響について評価し腐食式を策定した。また、JNC材の高Ni鋼については20Cr/25Ni/Nbにより策定された式(省略)を適用することにした。

lt is necessary for feasibility study of fast reactor to evaluate the oxidation of the austenitic stainless steels in the case of using for core material in carbon dioxide gas-cooled reactor. The properties for oxidation of austenitic stainless steels in carbon dioxide were surveyed in literatures and the data were selected after evaluation of factors for oxidation in carbon dioxide. The equation of oxidation in carbon dioxide for PE16, 20Cr/25Ni/Nb, 18Cr-8Ni and JNC Cladding materials were proposed. The equation for oxidation of austenitic stainless steels were expressed as upper limit for the equation according to parabolic law. The equation for JNC cladding materials (PNC316, PNC1520, 14Cr-25Ni) was proposed based the oxidation behavior of 18Cr-8Ni which is same oxidation region for weight gain in three-component system of Fe-Cr-Ni, in addition to evaluate of effect for silicon content. The oxidation equation of 20Cr/25Ni/Nb was applied to the high Ni alloy of JNC cladding material. The obtained equation is as follows, X = 4.4W$$times$$1000, W = $$sqrt{(kp・t)}$$, kp = $$alpha$$ exp(-Q/(RT)), X: oxide thickness[$$mu$$m], W : weight gain[g$$times$$cm$$^{-2}$$], kp : parabolic rate constant[g$$^{2}$$$$times$$cm$$^{-4}$$$$times$$ s$$^{-1}$$], t :time[sec] $$alpha$$ : constant[g$$^{2}$$$$times$$cm$$^{-1}$$$$times$$S$$^{-1}$$], Q : activation energy[J・mol$$^{-1}$$], R : gas constant[8.314J $$times$$K$$^{-5}$$ $$times$$mol$$^{-1}$$], T : temperature[K] (1) PE16 : kp = 1.090$$times$$10$$^{-3}$$ exp(-192,500/(RD)), (2) 20Cr/25Ni/Nb : kp = 1.651$$times$$10$$^{-2}$$ exp(-201,300/(RT)) High Ni alloy (JNC), (3)18Cr-8Ni : kp = 1.503$$times$$10$$^{-8}$$ exp(-60,000/(RT)), (4) PNC316, PNC1520 : kp = 1.503$$times$$10$$^{-8}$$ exp(-60,000/(RT))$$times$$0.62$$^{2}$$ 14Cr-25Ni(JNC) The weight gain is (3)$$rangle$$(4)$$rangle$$(2)$$rangle$$(1) in order.

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