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ISSN : 1738-1894(Print)
ISSN : 2288-5471(Online)
ISSN : 2288-5471(Online)
CANDU 처분용기의열적-구조적안정성평가
Analysis of the Thermal and Structural Stability for the CANDU Spent Fuel Disposal Canister
Abstract
In deep geological disposal system, the integrity of a disposal canister having spent fuels is veryimportant factor to assure the safety of the repository system. This disposal canister is one elementof the engineered barriers to isolate and to delay the radioactivity release from human beings andthe environment for a long time so that the toxicity does not affect the environment. The mainrequirement in designing the deep geological disposal system is to keep the buffer temperaturebelow 100 by the decay heat from the spent fuels in the canister in order to maintain theintegrity of the buffer material. Also, the disposal canister can endure the hydraulic pressure in thedepth of 500 m and the swelling pressure of the bentonite as a buffer. In this study, new concept ofthe disposal canister for the CANDU spent fuels which were considered to be disposed without anytreatment was developed and the thermal stability and the structural integrity of the canister wereanalysed. The result of the thermal analysis showed that the temperature of the buffer was 88.9 when 37 years have passed after emplacement of the canister and the spacings of the disposaltunnel and the deposition holes were 40 m and 3 m, respectively. In the case of structural analysis,the result showed that the safety factors of the normal and the extreme environment were 2.9 and1.33, respectively. So, these results reveal that the canister meets the thermal and the structuralrequirements in the deep geological disposal system.
CANDU spent fuel, Deep geological disposal, Engineered barrier, Disposal canister, Buffer material, Thermal-structural stability, CANDU 사용후핵연료, 심지층처분, 공학적방벽, 처분용기, 완충재, 열적-구조적안정성
Reference
JNFCWT
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Korean Radioactive
Waste Society (KRS)
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