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ISSN : 1738-1894(Print)
ISSN : 2288-5471(Online)
ISSN : 2288-5471(Online)
고준위 방사성폐기물 처분장 불량 용기 발생 시나리오에 대한 폐쇄후 장기 방사선적 안전성 평가
Post Closure Long Term Safely of the Initial Container Failure Scenario for a Potential HLW Repository
Abstract
A waste container, one of the key components of a multi-barrier system in a potential high level radioactive waste (HLW) repository in Korea ensures the mechanical stability against the lithostatic pressure of a deep geologic medium and the swelling pressure of the bentonite buffer. Also, it delays potential release of radionuclides for a certain period of time, before it is corroded by intruding impurities. Even though the material of a waste container is carefully chosen and its manufacturing processes are under quality assurance processes, there is a possibility of initial defects in a waste container during manufacturing. Also, during the deposition of a waste container in a repository, there is a chance of an incident affecting the integrity of a waste container. In this study, the appropriate Features, Events, and Processes(FEP's) to describe these incidents and the associated scenario on radionuclide release from a container to the biosphere are developed. Then the total system performance assessment on the Initial waste Container Failure (ICF) scenario was carried out by the MASCOT-K, one of the probabilistic safety assessment tools KAERI has developed. Results show that for the data set used in this paper, the annual individual dose for the ICF scenario meets the Korean regulation on the post closure radiological safety of a repository.
HLW disposal, Scenario, FEP, Total system performance assessment;Initial container failure Dose, MASCOT-K, 고준위 방사성폐기물 처분, 처분 종합 성능 평가, 불량 용기 시나리오, 선량
Reference
JNFCWT
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Korean Radioactive
Waste Society (KRS)
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