구조 안전성을 고려한 사용후핵연료 처분용기 단면의 최적설계

Abstract

Spent nuclear fuel from nuclear reactors needs to be disposed of in isolation fromhumans and the environment as much as possible due to high heat and high radioactivity. Amongthe disposal methods of spent nuclear fuel, deep geological disposal, which is disposed of in theground more than 500 m underground, is being considered as the most promising method. Inthe case of deep geological disposal, an engineered barrier is required to prevent radioactivematerial from leaking from the disposal container and spreading to the natural environment, andstructural safety and criticality safety are required. In this study, to secure the structural safety ofthe disposal container and at the same time increase the handling efficiency, a study was conductedon a method of reducing the weight through structural change. During deep geological disposal,the critical safety evaluation of engineered barriers including the spent fuel copper disposalcontainer was performed to calculate the interval among baskets for the spent fuel required forthe design of the disposal cask. And by applying the analytical stress calculation method based onthe beam theory, the efficient optimization of the cross-section of the disposal cask was performed. It was confirmed that a design that can have handling efficiency while securing structural andcritical safety through the developed optimal design process can be secured.