基于两阶段累积损伤的辐照条件下堆芯紧固件疲劳可靠性评估方法  

The Fatigue Reliability Evaluation Method for Core Fasteners under Two-stage Cumulative Damage Based Irradiation Conditions

作　　者：高志虎 潘俊林 孙博[1] 杨西 吴泽豫 王自力[1] GAO Zhihu;PAN Junlin;SUN Bo;YANG Xi;WU Zeyu;WANG Zili(School of Reliability and Systems Engineering,Beihang University,Beijing 100191,China)

机构地区：[1]北京航空航天大学可靠性与系统工程学院,北京100191

出　　处：《核科学与工程》2024年第6期1271-1280,共10页Nuclear Science and Engineering

摘　　要：堆芯紧固件是确保反应堆堆芯围板可靠连接与固定的关键结构件,服役过程中极易受到堆芯辐照作用而发生辐照促应力腐蚀开裂(IASCC),但目前缺乏考虑反应堆服役阶段辐照影响的堆芯紧固件可靠性定量评估方法。本文基于IASCC裂纹萌生时间模型和裂纹扩展时间模型,考虑堆芯内部中子辐照和温度等关键因素变化,提出了一种基于两阶段累积损伤的堆芯紧固件疲劳可靠性评估方法,根据反应堆实际运行工况,量化辐照对紧固件的累积损伤,进而建立疲劳可靠性模型。该方法能够用于反应堆不同运行工况条件下堆芯紧固件的疲劳可靠性评估,可为反应堆的精准运维提供定量依据支撑。The reactor core fasteners are the key structural parts to ensure the reliable connection and fixation of the core baffle,which are influenced by irradiation assisted stress corrosion cracking(IASCC).However,there is a lack of quantitative assessment methods for core fastener reliability considering the effects of irradiation during the operational phase.In this paper,a novel two-stage cumulative damage based fatigue reliability assessment method for core fasteners based on the IASCC crack emergence time model and the crack expansion time model is proposed,considering the variation of key factors such as neutron radiation and temperature inside the core.This method quantifies the cumulative damage of irradiation on fasteners according to the actual operating conditions of the reactor,and then establishes a fatigue reliability model.The method can be used to assess the core fastener fatigue reliability under different operating conditions of the reactor,which can provide quantitative basis support for accurate operation and maintenance of the reactor.

关 键 词：堆芯紧固件 疲劳 可靠性 辐照 累积损伤 

分 类 号：TL364[核科学技术—核技术及应用]