〔35〕原子炉材料のスエリングとヘリウム損傷
1969 年 11 巻 2 号 p. 96-105
詳細
1969 年 11 巻 2 号 p. 96-105
The production of inert gases by irradiation gives rise to various consequential effects on reactor materials such as swelling, fission product release and high temperature embrittlement. A review is presented on the production and the behavior of inert gases in reactor materials. Special emphasis is placed on the behavior of gas bubbles in solids. Studies in this field should be indispensable, for example, in raising the burnup attainable with metallic fuels and in preventing high-temperature embrittlement in FBR fuel cladding materials.
The article first covers the production of gas atoms by irradiation, and proceeds to a discussion of gas atoms in "as irradiated" condition. Further, the nucleation and growth of gas bubbles is treated, and attention is drawn to the importance of the role of vacancies. The migration of bubbles especially under various generalized forces is discussed. Finally, reference is made to the effects of gas bubbles in three typical cases, i.e. in metallic fuels, in UO2 and in stainless steels. Several principles that have been adopted to minimize swelling are also discussed.
