In a severe accident of a light water reactor, ablation of the RPV （reactor pressure vessel） lower head by corium is a key phenomenon, which affects progression of the accident. The MPS （moving particle semi-impli...In a severe accident of a light water reactor, ablation of the RPV （reactor pressure vessel） lower head by corium is a key phenomenon, which affects progression of the accident. The MPS （moving particle semi-implicit） method is one of particle methods that calculate behavior of incompressible fluid by semi-implicit method. In preceding studies, the MPS method has been extensively studied and developed for simulations of different phenomena involved in severe accident of nuclear reactors. This paper aims to investigate whether the MPS method is capable of analyzing the lower head ablation phenomenon. The small-scale experiment carried out at CRIEPI （Central Research Institute of Electric Power Industry） using Pb-Bi vessel and silicone oil was analyzed for the validation of the MPS method. The MPS analysis well reproduced the experimental phenomena qualitatively. However, with respect to some quantitative results, more investigation such as influence of the calculation particle size is necessary.展开更多
文摘石化行业中长期服役于高温环境的承压设备通常会产生蠕变损伤,尤其是在交变载荷下,蠕变损伤还会加剧疲劳失效,严重影响承压设备的运行安全。蠕变疲劳失效是一种牵涉到多因素的复杂失效模式,ASME Ⅷ-1或ASME Ⅷ-2的设计规则并未对此给出处理的指导原则和方向。ASME Code Case 2605和ASME Code Case 2843中的高温设计规则可以作为高温蠕变疲劳失效模式的补充设计规定,但是,在承压设备的蠕变疲劳设计中,除了设计方法和评定准则外,设备的结构、选材、制造、检验检测等方面的注意事项也需要慎重考虑。对高温设备设计的注意事项和细节进行了归纳总结,为工程设计人员在高温设计时提供参考。
文摘In a severe accident of a light water reactor, ablation of the RPV （reactor pressure vessel） lower head by corium is a key phenomenon, which affects progression of the accident. The MPS （moving particle semi-implicit） method is one of particle methods that calculate behavior of incompressible fluid by semi-implicit method. In preceding studies, the MPS method has been extensively studied and developed for simulations of different phenomena involved in severe accident of nuclear reactors. This paper aims to investigate whether the MPS method is capable of analyzing the lower head ablation phenomenon. The small-scale experiment carried out at CRIEPI （Central Research Institute of Electric Power Industry） using Pb-Bi vessel and silicone oil was analyzed for the validation of the MPS method. The MPS analysis well reproduced the experimental phenomena qualitatively. However, with respect to some quantitative results, more investigation such as influence of the calculation particle size is necessary.
