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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。
In view of the limitations of RTNDT parameters under the most commonly used structural critical failure conditions in the thermal shock analysis of reactor pressure vessels and the difficulty of differentiating RTNDT parameters from those of different load types Based on the structural safety margin criterion and three-dimensional numerical simulation, the effects of thermal stress and internal pressure load on the crack tip front of reactor pressure vessel core and the interface point And surfacing layer at the beginning of the cracking and cracking at the performance. The analysis considers the influence of such factors as crack size, crack front temperature and the distribution of neutron fluence along the wall thickness of the container.