反应堆压力容器(RPV)是装载堆芯、支撑堆内构件和容纳一回路冷却剂并维持其压力的堆本体承压壳体,寿期内不可更换,是核电站安全和寿期的决定因素。RPV服役环境为高温、高压和裂变中子辐照,其老化的主要问题是辐照脆化、疲劳和热老化。RPV的老化行为增加了RPV脆性断裂概率,降低堆的安全性和服役寿命。因此,针对 Reactor Pressure Vessel (RPV) is a pressurized body of a stack body that holds the core, supports the reactor internals and holds the primary coolant and maintains its pressure, which is not replaceable over its lifetime and is a determining factor in the safety and lifetime of the plant. RPV service environment is high temperature, high pressure and fission neutron radiation, the aging of the main problems are radiation embrittlement, fatigue and heat aging. The aging behavior of RPV increases the probability of RPV brittle fracture, reducing the safety and service life of the reactor. So, for