Dissolution behaviors of corrosion products on 316LN stainless steel in different simulated shutdown acid-reducing water chemistry environments
作者
单位
1CAS Key Laboratory of Nuclear Materials and Safety Assessment、Liaoning Key Laboratory for Safety and Assessment Technique of Nuclear Materials、Institute of Metal Research、Chinese Academy of Sciences、Shenyang 110016、PR China 2School of Materials Science and Engineering、University of Science and Technology of China、Hefei 230026、PR China
关键词
收录来源
International Corrosion Congress · 第22届国际腐蚀大会
摘要
The activated corrosion products are the main radiation source of primary system. During the shutdown process of pressurized water reactor (PWR) nuclear power plants (NPPs), the activated corrosion products can be released into the primary coolant and removed so that the radiation dose of the primary system is reduced [1,2]. The research on dissolution behaviors of corrosion products during the shutdown process is important in dose estimation and optimization of radiation protection. The dissolution behaviors of corrosion products on 316LN stainless st eel (SS) under different simulated shutdown acid -reducing water chemistry were investigated. The outer Fe-rich corrosion products formed in primary operation water chemistry dissolved during the simulated shutdown acid -reducing process. NiFe 2O4 began to di ssolve at the initial stage of boration, but the dissolution of Fe 3O4 mainly occurred at the low - temperature stage during acid -reducing process. Low pH value and low temperature conditions are conducive to the dissolution of the outer Fe-rich oxides.