Journal of Radiation Industry (방사선산업학회지)

Korean Society of Radiation Industry (한국방사선산업학회)
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Development of Spent Nuclear Fuel Transportation Worker Exposure Scenario by Dry Storage Methods

건식 저장방식별 사용후핵연료 운반 작업자 피폭시나리오 개발

  • Geon Woo Son (Department of Nuclear Engineering, Kyung Hee University) ;
  • Hyeok Jae Kim (Department of Nuclear Engineering, Kyung Hee University) ;
  • Shin Dong Lee (Department of Nuclear Engineering, Kyung Hee University) ;
  • Min Woo Kwak (Department of Nuclear Engineering, Kyung Hee University) ;
  • Kwang Pyo Kim (Department of Nuclear Engineering, Kyung Hee University)
  • 손건우 (경희대학교 원자력공학과) ;
  • 김혁재 (경희대학교 원자력공학과) ;
  • 이신동 (경희대학교 원자력공학과) ;
  • 곽민우 (경희대학교 원자력공학과) ;
  • 김광표 (경희대학교 원자력공학과)
  • Received : 2024.03.07
  • Accepted : 2024.03.25
  • Published : 2024.03.31
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Abstract

Currently, there are no interim storage facilities and permanent disposal facilities in Korea, so all spent nuclear fuels are temporarily stored. However, the temporary storage facility is approaching saturation, and as a measure to this, the 2nd Basic Plan for the Management of High-Level Radioactive Waste presented an operation plan for dry interim storage facilities and dry temporary storage facilities on the NPP on-site. The dry storage can be operated in various ways, and to select the optimal dry storage method, the reduction of exposure for workers must be considered. Accordingly, it is necessary to develop a worker exposure scenario according to the dry storage method and evaluate and compare the radiological impact for each method. The purpose of this study is to develop an exposure scenario for workers transporting spent nuclear fuel by dry storage method. To this end, first, the operation procedure of the foreign commercial spent nuclear fuel dry storage system was analyzed based on the Final Safety Analysis Report (FSAR). 1) the concrete overpack-based system, 2) the metal overpack-based system, and 3) the vertical storage module-based system were selected for analysis. Factors were assumed that could affect the type of work (working distance, working hours, number of workers, etc.) during transportation work. Finally, the work type of the processes involved in transporting spent nuclear fuel by dry storage method was set, and an exposure scenario was developed accordingly. The concrete overpack method, the metal overpack method, and the vertical storage module method were classified into a total of 31, 9, and 23 processes, respectively. The work distance, work time, and number of workers for each process were set. The product of working hours and number of workers (Man-hour) was set high in the order of concrete overpack method, vertical storage module method, and metal overpack method, and short-range work (10 cm) was most often applied to the concrete overpack method. The results of this study are expected to be used as basic data for performing radiological comparisons of transport workers by dry storage method of spent nuclear fuel.

Keywords

Acknowledgement

본 연구는 한국에너지기술평가원에서 주관하는 에너지 기술개발사업의 일환으로 수행된 연구입니다(No. 2021171020001B).

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