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一、反应堆对结构材料性能的要求反应堆用的结构材料包括:堆芯结构材料、燃料元件包壳材料、反应堆容器以及热交换器材料等。随着反应堆的发展、堆的运行温度大幅度提高、燃耗进一步加深,材料的强度和抗腐蚀、耐辐照性能显得重要起来。因此,原先用的铝、镁及其合金就不能使用了,像不锈钢、镍基合金及难熔金属等强度高、抗腐蚀和耐辐照性能好的材料,尽管其中子俘获截面较大,但得到了应用。1、热堆对结构材料的要求:(1)良好的核性能,热中子吸收截面小,吸收中子后的感生放射性弱—没有 r 放
First, the reactor requirements of structural materials Performance of the structural materials used in the reactor include: core structural materials, fuel cladding components, reactor vessels and heat exchanger materials. With the development of the reactor, the operating temperature of the reactor is greatly increased, and the fuel consumption is further deepened. The strength, corrosion resistance and radiation resistance of the material are important. Therefore, the original use of aluminum, magnesium and its alloys can not be used, such as stainless steel, nickel-based alloys and refractory metals such as high strength, corrosion resistance and good irradiation resistance of materials, despite its large neutron capture cross-section, Has been applied. 1, the thermal reactor on the structural material requirements: (1) good nuclear performance, thermal neutron absorption cross section is small, after the absorption of neutron induced radioactivity is weak - no r