Stress intensity factors (SIF) of a nozzle corner crack in a pressure vessel subject to pressure and thermal loadings are evaluated using finite element method (FEM) and compared with the method described in ASME XI appendix G (2013 section XI). The formula in ASME XI appendix G is defined for the crack corner at a specific location of the nozzle/vessel connection which may limit the structural integrity assessment of the pressure vessel under ever changing pressures and temperatures duty loads during heat-up and cool-down phases. Using FE method SIFs at corners of similar cracks assumed at other nozzle locations are then evaluated and compared with SIFs using ASME formula to assess the degree of conservatism.

使用有限元方法 (FEM) 评估承受压力和热载荷的压力容器中喷嘴角裂纹的应力强度因子 (SIF)，并与 ASME XI 附录 G（2013 年第 XI 部分）中描述的方法进行比较。ASME XI 附录 G 中的公式是针对喷嘴/容器连接特定位置处的裂纹角定义的，这可能会限制压力容器在加热和冷却过程中不断变化的压力和温度负载下的结构完整性评估阶段。然后使用有限元方法评估在其他喷嘴位置假设的类似裂纹拐角处的 SIF，并与使用 ASME 公式的 SIF 进行比较，以评估保守程度。