核压力容器是核动力装置的重要设备,它一旦投入核动力装置中使用,就受到强大的中子和γ射线等的辐照,其物理、化学和机械性能随着中子和γ射线的辐照而变化,特别是机械性能方面出现脆化现象,容易发生脆性破裂事故,引起严重的恶果。因此防止核压力容器的脆性破裂问题在设计中作为重要问题来考虑,并且在使用过程中也要不断注意材料的脆化程度,特别是近年来,世界各国核工程人员都对这问题给以足够的重 Nuclear pressure vessel is an important nuclear power plant equipment, once it is used in nuclear power plant, it is subject to strong neutron and γ-ray irradiation, the physical, chemical and mechanical properties with the neutron and γ-ray radiation According to the changes, especially in the mechanical properties of embrittlement, prone to brittle fracture, causing serious consequences. Therefore, to prevent brittle fracture of nuclear pressure vessel in the design issues as an important issue to consider, and in the course of the use of materials also have to pay attention to the degree of embrittlement, especially in recent years, nuclear engineering countries in the world have given enough of this problem Heavy