水辐解对反应堆材料SS316腐蚀速率的影响研究  

Effects of water radiolysis on corrosion rate of 316 stainless steel in reactors

作　　者：王晓东 张竞宇[1] 陈义学[1] 郭庆洋 樊雨轩 梁秋莹 熊雯雯 WANG Xiaodong;ZHANG Jingyu;CHEN Yixue;GUO Qingyang;FAN Yuxuan;LIANG Qiuying;XIONG enwen(School of Nuclear Science and Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学核科学与工程学院,北京102206

出　　处：《核技术》2020年第8期7-12,共6页Nuclear Techniques

基　　金：国家科技重大专项资助项目(No.2019ZX06005001)资助。

摘　　要：水作为反应堆的主要冷却剂之一,在经过堆芯的辐照区时会产生辐解,生成具有强氧化性的O2、H2O2等产物,这些产物会对材料的腐蚀速率造成影响,进而影响反应堆的活化腐蚀产物源项。在已有理论和模型的基础上,将水辐照分解计算和材料腐蚀速率计算结合起来,以评估水辐照分解对反应堆材料腐蚀速率的影响。根据反应堆的运行工况,计算出冷却回路中水辐解的主要产物O2和H2O2的产额在0.1~10μmol·L^-1之间,结合电化学中的混合电位理论,进一步计算得出SS316材料的电化学腐蚀速率在0.012~0.026 g·m^-2·h^-1范围内。[Background] As one of the main coolants of reactor, water generates radiolysis when passing through the radiation zone of the reactor core, and produces oxidizing species such as O2 and H2O2, which will affect the corrosion rate of the material and then affect the source term of active corrosion products(ACPs). [Purpose] This study aims to establishe a method to calculate the corrosion rate of reactor materials by analyzing the radiation decomposition effect of water. [Methods] Based on the existing theories and models, the calculation of water irradiation decomposition was combined with the calculation of material corrosion rate. Concentrations of O2 and H2O2, the main products of water irradiation decomposition, were obtained and the effect of O2 and H2O2 on the corrosion rate of the 316 stainless steel(SS316) material was calculated by combining the theory of mixed potential and Faraday’s law.[Results] The calculation results show that the yields of O2 and H2O2, the main products of water radiolysis in the cooling circuit of the water-cooled reactor, are between 0.1~10 μmol·L^-1 under normal operating conditions, and the electrochemical corrosion rate of SS316 is in the range of 0.012~0.026 g·m^-2·h^-1. [Conclusions]Water radiolysis is an important factor affecting the corrosion rate of reactor material SS316.

关 键 词：水辐解 SS316 腐蚀速率 反应堆 

分 类 号：TL99[核科学技术—核技术及应用]