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Study on New Water Chemistry Control for Stabilization of Oxide Films in Coolant Systems of Light Water Reactors

轻水堆冷却剂系统氧化膜稳定的新型水化学控制研究

基本信息

批准号：
09558057
负责人：
ISHIGURE Kenkichi
金额：
$ 7.36万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09558057/
关键词：
light water reactor water chemistry zinc injection corrosion product oxide film stress corrosion cracking hydrogen injection noble metal chemical addition 不定比スピネルクロムイオンクロマイト Co取り込み金属酸化皮膜高温水系熱力学フェライト溶解度

项目摘要

The present status of water chemistry in Japanese LWR was widely reviewed from literature and discussion with relevant experts. Then zinc injection and noble metal chemical addition were picked up as major subjects in this project.It was shown experimentally and analytically that zinc ion injected forms complex ferrites and chromites as a result of interaction with Fe and Cr ions, respectively, on the surfaces of stainless steel and fuel cladding and that cobalt accumulation in the inner oxide layer (chromites) on the surface of stainless steel is suppressed effectively by zinc injection while it is not necessarily effective for the suppression of cobalt pick-up in the outer layer (ferrites).The experimental result showed that zinc injection forms very thin inner oxide layer of zinc chromite that is very stable thermodynamically and thus reduces remarkably the corrosion of stainless steel, consequently being effective for reducing the cobalt accumulation.It was also shown experimentall … More y that Cr(VI) ion in aqueous phase oxidizes Zr on contacting with Zircaloy and is precipitated on its surface as amorphous Cr(III) oxides in the absence of zinc ion but as crystaline zinc chromite in the presenee of zinc ion. This Cr deposition is considered to be closely related with cobalt dissolution from the surface deposits of the fuel and was found to be remarkably suppressed by the pre-conditioning of the Zircaloy.Platinum injection is now expected to make hydrogen injection more effective in BWR, and the chemical behavior of a tetra-ammine complex of Pt(II) and hexa-hydroxo-complex of Pt(IV) was investigated in aqueous solutions under gamma-irradiation.The Pt(II) complex is easily reduced and forms Pt metal in aqueous phase by heating to 120 〜 150 ℃ while the Pt(IV) complex is not reduced and consequently does not form Pt metal only by the heating. Gamma irradiation readily reduces both of the Pt complexes to Pt metal in the presence of HィイD22ィエD2 or alcohols, but not in the presence of OィイD22ィエD2. The diameters and the catalytic property of the small particles of Pt metal formed were found to be largely affected by the condition of the particle preparation. This result shows that the effect of radiation is very important in the noble metal addition in real plants. Less

通过文献和相关专家的讨论，对日本轻水堆的水化学现状进行了广泛的回顾。然后，喷锌和贵金属化学添加作为该项目的主要研究对象。通过实验和分析表明，喷锌离子分别与不锈钢和燃料包壳表面上的Fe和Cr离子相互作用，形成复合铁氧体和铬铁矿，并且喷锌有效抑制了不锈钢表面内氧化层（铬铁矿）中钴的积累，同时实验结果表明，喷锌形成非常薄的热力学稳定的亚铬酸锌内氧化层，从而显着减少不锈钢的腐蚀，从而有效减少钴的积累。实验还表明，水相中的 Cr(VI) 离子会氧化 Zr 与锆合金接触时，在没有锌离子的情况下，以无定形 Cr(III) 氧化物的形式沉淀在其表面上，而在有锌离子的情况下，以结晶亚铬酸锌的形式沉淀在其表面上。人们认为这种 Cr 沉积与燃料表面沉积物中的钴溶解密切相关，并且发现 Zircaloy 的预处理可以显着抑制这种 Cr 沉积。现在预计铂注入可以使 BWR 中的氢注入更加有效，并且研究了 Pt(II) 四氨络合物和 Pt(IV) 六羟基络合物在水溶液中的化学行为在γ射线照射下，Pt(II)络合物在水相中加热至120〜150℃很容易被还原并形成Pt金属，而Pt(IV)络合物不被还原，因此仅通过加热不会形成Pt金属。在 HィイD22ィエD2 或醇存在下，伽马辐射很容易将两种 Pt 配合物还原为 Pt 金属，但在 OィイD22ィD2 存在下则不然。发现所形成的Pt金属小颗粒的直径和催化性能很大程度上受颗粒制备条件的影响。这一结果表明，辐射的影响对于真实植物中贵金属的添加非常重要。较少的