건식 저장방식별 사용후핵연료 운반 작업자 피폭시나리오 개발
Development of Spent Nuclear Fuel Transportation Worker Exposure Scenario by Dry Storage Methods
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Currently, there are no interim storage facilities and permanent disposal facilities in Korea, so all spentnuclear fuels are temporarily stored. However, the temporary storage facility is approaching saturation, and as a measureto this, the 2nd Basic Plan for the Management of High-Level Radioactive Waste presented an operation plan fordry interim storage facilities and dry temporary storage facilities on the NPP on-site. The dry storage can be operatedin 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 andevaluate and compare the radiological impact for each method. The purpose of this study is to develop an exposurescenario for workers transporting spent nuclear fuel by dry storage method. To this end, first, the operation procedureof 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 storagemodule-based system were selected for analysis. Factors were assumed that could affect the type of work (workingdistance, working hours, number of workers, etc.) during transportation work. Finally, the work type of the processesinvolved in transporting spent nuclear fuel by dry storage method was set, and an exposure scenario was developedaccordingly. The concrete overpack method, the metal overpack method, and the vertical storage module methodwere classified into a total of 31, 9, and 23 processes, respectively. The work distance, work time, and number ofworkers for each process were set. The product of working hours and number of workers (Man-hour) was set high inthe order of concrete overpack method, vertical storage module method, and metal overpack method, and short-rangework (10 cm) was most often applied to the concrete overpack method. The results of this study are expected to beused as basic data for performing radiological comparisons of transport workers by dry storage method of spent nuclearfuel.
Abstract
Currently, there are no interim storage facilities and permanent disposal facilities in Korea, so all spentnuclear fuels are temporarily stored. However, the temporary storage facility is approaching saturation, and as a measureto this, the 2nd Basic Plan for the Management of High-Level Radioactive Waste presented an operation plan fordry interim storage facilities and dry temporary storage facilities on the NPP on-site. The dry storage can be operatedin 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 andevaluate and compare the radiological impact for each method. The purpose of this study is to develop an exposurescenario for workers transporting spent nuclear fuel by dry storage method. To this end, first, the operation procedureof 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 storagemodule-based system were selected for analysis. Factors were assumed that could affect the type of work (workingdistance, working hours, number of workers, etc.) during transportation work. Finally, the work type of the processesinvolved in transporting spent nuclear fuel by dry storage method was set, and an exposure scenario was developedaccordingly. The concrete overpack method, the metal overpack method, and the vertical storage module methodwere classified into a total of 31, 9, and 23 processes, respectively. The work distance, work time, and number ofworkers for each process were set. The product of working hours and number of workers (Man-hour) was set high inthe order of concrete overpack method, vertical storage module method, and metal overpack method, and short-rangework (10 cm) was most often applied to the concrete overpack method. The results of this study are expected to beused as basic data for performing radiological comparisons of transport workers by dry storage method of spent nuclearfuel.
참고문헌 (24)
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