AP1000一回路氧化膜特性研究

Abstract

Abstract: The difference between AP1000 and other general PWRs is that its primary loop adopts zinc in-jection and hydrogenation technology, which changes the characteristics of oxide film in the pri-mary loop. The experiment simulates water chemistry condition of AP1000 primary loop in auto-clave to study the characteristics of the oxide film formed on the surface of the three main reactor process equipment materials of F304L, F316, and 690. The results show that the oxide film is a bilayer structure, and the outer oxide film components are mainly Fe₂O₃ and Fe₃O₄. The inner oxide film of F304L and F316 stainless steel is mainly ZnCr₂O₄, and the injected Zn element replaces the iron element in FeCr₂O₄ to form a dense ZnCr₂O₄ oxide layer. A small amount of ZnO and ZnFe₂O₄ is present in the inner oxide film. The inner oxide film of 690 alloy is ZnCr₂O₄, with high content of ZnO and ZnFe₂O₄. Unlike F304L, F316, the oxide film of the 690 alloy contains a small amount of divalent nickel in the form of NiFe₂O₄ and NiCr₂O₄. The addition of zinc and hydrogen makes the oxide film denser and sig-nificantly thinner.

Key words: AP1000, zinc addition, hydrogenation, oxide film

CLC Number:

TL944

CUI Yujie, WU Mingliang, ZHANG Yi, NIU Qiang, WANG Yongxian, GUO Lixiao, ZHAO Wei, CUI Anxi. Research of oxide film properties of AP1000 primary loop[J].RADIATION PROTECTION, 2021, 41(4): 302-308.

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Research of oxide film properties of AP1000 primary loop

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