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Structural integrity assessment of a nuclear vessel with FITNET FFS and Master Curve approach

机译:使用FITNET FFS和Master Curve方法评估核船的结构完整性

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The structural integrity of a Spanish nuclear vessel was assessed by obtaining the operation pressure-temperature (P-T) limit curves relevant to the beltline region according to the ASME Code. This method requires the knowledge of the material fracture toughness in the ductile to brittle transition (DBT) region which is conventionally described by the semi-empirical reference temperature RT_(NDT). Recent development of the Master Curve (MC) methodology, with T_0 as a reference temperature, is an attractive alternative that do not rely on empirical correlations. Thus, the P-T curves were also calculated according to the N-629 and N-631 ASME Code Cases which partially include T_0 through RT_(T_0). Finally, to evaluate the conservatism of the different methodologies (ASME Code and Code Cases), the analysis was performed by means of the FITNET FFS procedure that consistently incorporates the MC concepts. The study demonstrates the conservatism of the ASME code which is manly due to the definition of the semi-empirical RT_(NDT) index.
机译:通过根据ASME规范获得与安全带区域相关的工作压力-温度(P-T)极限曲线,评估了西班牙核船的结构完整性。此方法需要了解韧性到脆性转变(DBT)区域中的材料断裂韧性,这通常由半经验参考温度RT_(NDT)来描述。以T_0作为参考温度的Master Curve(MC)方法的最新发展是一种有吸引力的替代方法,它不依赖于经验相关性。因此,P-T曲线也根据N-629和N-631 ASME代码案例(部分包括T_0至RT_(T_0))进行计算。最后,为了评估不同方法(ASME规范和规范案例)的保守性,分析是通过FITNET FFS程序进行的,该程序始终包含MC概念。研究表明,由于半经验RT_(NDT)索引的定义,ASME代码的保守性很强。

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