B-Li水化学对核电金属材料腐蚀的影响

Effect of B-Li Water Chemistry on Corrosion of Metal Materials of Nuclear Power Plant

本文阐述了压水堆核电站一回路B-Li水化学工况控制的发展趋势,及其对腐蚀产物、降低剂量率的作用;概括了B浓度、Li浓度及pH值对镍基合金、不锈钢、锆合金的PWSCC敏感性、裂纹扩展速率、腐蚀产物释放速率等性能的影响;分析了核电站应用富集硼酸的积极作用。一回路水化学控制在较高pH有利于减少核电站金属材料的腐蚀,提高核电站的安全与可靠性。

This paper represented the development trend of primary B-Li water chemistry conditions in pressurized water reactor nuclear power plant, and the functions of water chemistry in the corrosion products and dose rate. The effect of B concentration, Li concentration and pH on the PWSCC sensitivity, the crack propagation rate and the corrosion product release rate of nickel-based alloys, stainless steel, and zirconium alloy had been reviewed. The advantage of enriched boric acid application in nuclear power plant was also analyzed. The higher pH value of primary water chemistry have the benefit of reducing corrosion of metal materials in nuclear power plant, and improve the safety and reliability of nuclear power plants.