核电厂核级承压设备对铁素体材料的断裂韧性基本要求

Basic Fracture Toughness Requirements for Ferritic Materails of Nuclear Class Pressure Retaining Equipments in NPP

本文概要介绍了铁素体材料构件的低温脆断的理论基础和抗脆断设计,总结并评价了ASME规范中对核电厂核安全级别承压设备铁素体材料抗脆断的断裂韧性要求,即核安全级别与材料的缺口冲击韧性要求之间存在相应的关系,从而保证了核电厂承压边界不会发生脆性破裂。

In this paper,theory basis on cold brittleness and anti-brittle fracture design of ferritic materials are introduced summarily and fracture toughness requirements for ferritic materials in ASME code for nuclear safety class pressure retaining equipments in NPP are summarized and evaluated. The results show that notch impact toughness requirements for materials relate to nuclear safety class of materials so as to ensure that brittle fracture of retaining pressure boundary in NPP can not occur.