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Creep Analysis for the Pressurized Water Reactor Spent Nuclear Fuel Disposal Canister  

Ha Joon-Yong (홍익대학교 대학원)
Choi Jong-Won (한국원자력연구소)
Kwon Young-Joo (홍익대학교 기계정보공학과)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.17, no.4, 2004 , pp. 413-421 More about this Journal
Abstract
In this paper, a structural analysis for the pressurized water reactor(PWR) spent nuclear fuel disposal canister which is deposited under the 500m deep underground is carried out to predict the creep deformation of the canister while the underground water and swelling bentonite pressure are applied on the canister. Usually the creep deformation may be caused due to the Pressure and the high heat applied to the canister even though additional external loads are not applied to the canister. These creep deformations depend on the time. In this paper, oかy the underground water and bentonite swelling Pressure are considered for the creep deformation analysis of the canister, because the heat distribution inside canister due the spent fuel is not simple and depends on time. A proper creep function is adopted for the creep analysis. The creep analysis is carried out during $10^8$ seconds. The creep analysis results show that the creep strains are very small and these strains occur usually in the lid and bottom of the canister not in the cast iron insert. A much smaller strain is found in the cast iron insert. Hence, the creep deformation doesn't affect the structural safety of the canister, and also the creep stress which shows the stress relaxation phenomenon doesn't affect the structural safety of the canister.
Keywords
spent nuclear fuel disposal canister; underground water and swelling pressure; creep deformation; creep function; stress relaxation phenomenon;
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