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Thermal Stress Analysis of the Disposal Canister for Spent PWR Nuclear Fuels  

권영주 (홍익대학교 기계정보공학과)
하준용 (홍익대학교 대학원 기계설계학과)
최종원 (한국원자력연구소)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.15, no.3, 2002 , pp. 471-480 More about this Journal
Abstract
In this paper, the thermal stress analysis of spent nuclear fuel disposal canister in a deep repository at 500 m underground is carried out for the basic design of the canister. Since the nuclear fuel disposal usually emits much heat, a long term safe repository at a deep bedrock is used. Under this situation, the canister experiences the thermal load due to the heat generation of spent nuclear fuels in the basket. Hence, in this paper the thermal stress analysis is executed using the finite element method. The finite clement code Eot the analysis Is not written directly, but a commercial code, NISA, is used because of the complexity of the structure and the large number of elements required for the analysis. The analysis result shows that even though the thermal stress is added to the stress generated by the hydrostatic underground water pressure and the swelling pressure of the bentonite buffer, the total stress is still smaller than the yield stress of the cast iron. Hence, the canister is still structurally safe when the thermal loads we included in the external loads applied on the canister.
Keywords
spent nuclear fuel; disposal canister; thermal stress; Pressurized Water Reactor(PWR); underground water pressure; swelling pressure; cast iron insert; bentonite buffer; outer shell; finite element method;
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