CAJ | 학술논문

针对反应堆压力容器承压热冲击分析中较普遍采用的结构临界失效状态下材料韧脆转变温度(RTNDT)参数存在局限性的问题,和同时分析热应力载荷与内压载荷时难以区分不同载荷类型对结构安全性能影响差别的问题,基于结构安全裕量准则,通过三维数值模拟,分别研究了热应力载荷与内压载荷对反应堆压力容器堆芯筒体段裂纹前沿最深点和界面点(母材与堆焊层界面处)处的起裂和止裂性能的影响.分析中考虑了裂纹尺寸、裂纹前沿温度和中子注量沿容器壁厚方向上分布等因素的影响.
침대반응퇴압력용기승압열충격분석중교보편채용적결구림계실효상태하재료인취전변온도(RTNDT)삼수존재국한성적문제,화동시분석열응력재하여내압재하시난이구분불동재하류형대결구안전성능영향차별적문제,기우결구안전유량준칙,통과삼유수치모의,분별연구료열응력재하여내압재하대반응퇴압력용기퇴심통체단렬문전연최심점화계면점(모재여퇴한층계면처)처적기렬화지렬성능적영향.분석중고필료렬문척촌、렬문전연온도화중자주량연용기벽후방향상분포등인소적영향.
Focused on the two questions of the pressured thermal shock (PTS) of the reactor pressure vessel (RPV): 1) there are some limitations for the commonly used parameter of the critical ductile-brittle transition temperature (RTNDT); 2) and it is difficult to distinguish the influence between the thermal load and the pressure load in the combined analysis, the safety margin (SM) parameter is used to assess the safety of the crack deepest points and interface points along the crack front through 3-D finite element method in this paper. Both crack initiation assessment and crack arrest assessment are considered. A series of crack models are established, and the influence of the distribution of neutron fluence and temperature along the thickness direction are also included in the analysis.