Calculation and Comparison of Pressure-Temperature Limit Curves Calculation
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摘要: 核电厂在启停堆过程中必须将压力和温度控制在限值范围内,即压力温度限值曲线(P-T曲线)所允许的范围内,以防止反应堆压力容器发生脆性开裂。以法国的RCCM规范、美国的ASME规范和我国的核行业标准EJ/T918为对象,对比分析P-T曲线各自的计算方法,讨论了所采用的保守假设对计算结果的影响。研究表明,选取材料静态断裂韧性KIC计算P-T曲线将会增加核电厂启停堆过程中的操控空间;与最新版国外规范比较,我国行业标准EJ/T918的计算结果显得过于保守。Abstract: In order to prevent the brittle fracture,during nuclear power plant(NPP) heatup and cooldown processes,pressure and temperature in the reactor pressure vessel should be kept under the pressure-temperature(P-T) limit curve.In this paper,the P-T limit curve methodologies of ASME code,RCCM code and Chinese Nuclear Industry Standard EJ/T 918 are studied.Calculation and comparison of the P-T curves obtained using methods from different codes are performed.It shows that using static fracture toughness KIC instead of reference fracture toughness KIR to calculate the P-T curves increases acceptable operating region during NPP heatup and cooldown processes significantly.Comparing to the latest versions of ASME and RCCM codes,the Chinese standard is more conservative.
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