CAJ | 학술논문

美国核管会（NRC）在其管理导则RG 1．207中明确要求新建轻水堆核电厂设计中须考虑环境影响疲劳（Environmental Assisted Fatigue，EAF）问题。目前，我国新建核电厂在部件疲劳评价时尚未考虑EAF的影响。对环境影响疲劳的发展概况、疲劳裂纹和疲劳寿命的定义、ASME 设计疲劳曲线、现有ASME疲劳设计方法的保守性、美国环境影响疲劳设计方法等方面作了探讨，同时根据NUREG／CR 6909中Fen表达式，给出了典型材料在温度、溶解氧浓度和硫含量确定的情况下，Fen与应变速率的关系曲线。通过对以上相关问题的归纳和总结，以期加深业界对核电厂环境影响疲劳问题和现有ASME疲劳设计方法的认识。
미국핵관회（NRC）재기관리도칙RG 1．207중명학요구신건경수퇴핵전엄설계중수고필배경영향피로（Environmental Assisted Fatigue，EAF）문제。목전，아국신건핵전엄재부건피로평개시상미고필EAF적영향。대배경영향피로적발전개황、피로렬문화피로수명적정의、ASME 설계피로곡선、현유ASME피로설계방법적보수성、미국배경영향피로설계방법등방면작료탐토，동시근거NUREG／CR 6909중Fen표체식，급출료전형재료재온도、용해양농도화류함량학정적정황하，Fen여응변속솔적관계곡선。통과대이상상관문제적귀납화총결，이기가심업계대핵전엄배경영향피로문제화현유ASME피로설계방법적인식。
The regulatory guide RG 1 .207 issued by U.S.Nuclear Regulatory Commission (NRC ) required that the environmental assisted fatigue(EAF)issue should be considered for new light-water reactor (LWR)construction.Currently,the LWR environmental effects are not incorporated into fatigue analyses for new LWR construction in China.The EAF issue development history,the definition of fatigue crack and fatigue life,the ASME design fatigue curve,the conservatism for the existing ASME fatigue design approach and U.S.EAF design approach are discussed.Meanwhile,according to the Fen expressions in NUREG/CR 6909,given the certain temperature,dissolved oxygen content and sulfur content,the Fen and strain rate correlation curves for typical materials are presented.The author hopes that the discussions and summarizations for the above issues could deepen the understanding of the EAF issue and existing ASME fatigue design approach for industry colleagues.