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http://dx.doi.org/10.7733/jnfcwt.2020.18.S.75

Safety Assessment on Long-term Radiological Impact of the Improved KAERI Reference Disposal System (the KRS+)  

Ju, Heejae (Korea Atomic Energy Research Institute)
Kim, In-Young (Korea Atomic Energy Research Institute)
Lee, Youn-Myoung (Korea Atomic Energy Research Institute)
Kim, Jung-Woo (Korea Atomic Energy Research Institute)
Hwang, Yongsoo (Korea Atomic Energy Research Institute)
Choi, Heui-joo (Korea Atomic Energy Research Institute)
Cho, Dong-Keun (Korea Atomic Energy Research Institute)
Publication Information
Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT) / v.18, no.spc, 2020 , pp. 75-87 More about this Journal
Abstract
The Korea Atomic Energy Research Institute (KAERI) has developed geological repository systems for the disposal of high-level wastes and spent nuclear fuels (SNFs) in South Korea. The purpose of the most recently developed system, the improved KAERI Reference Disposal System Plus (KRS+), is to dispose of all SNFs in Korea with improved disposal area efficiency. In this paper, a system-level safety assessment model for the KRS+ is presented with long-term assessment results. A system-level model is used to evaluate the overall performance of the disposal system rather than simulating a single component. Because a repository site in Korea has yet to be selected, a conceptual model is used to describe the proposed disposal system. Some uncertain parameters are incorporated into the model for the future site selection process. These parameters include options for a fractured pathway in a geosphere, parameters for radionuclide migration, and repository design dimensions. Two types of SNF, PULS7 from a pressurized water reactor and Canada Deuterium Uranium from a heavy water reactor, were selected as a reference inventory considering the future cumulative stock of SNFs in Korea. The highest peak radiological dose to a representative public was estimated to be 8.19×10-4 mSv·yr-1, primarily from 129I. The proposed KRS+ design is expected to have a high safety margin that is on the order of two times lower than the dose limit criterion of 0.1 mSv·yr-1.
Keywords
Spent nuclear fuel; Disposal system; Geological repository; Safety assessment; KAERI reference system;
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Times Cited By KSCI : 4  (Citation Analysis)
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