지하수 특성 변화에 따른 부지 주변 피폭방사선량 평가
Assessment of Offsite Radiation Dose according to Groundwater Characteristics
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
Hundreds of residual radionuclides exist on the site after decommissioning nuclearfacilities, which spread around the site through routes such as groundwater leaching, surfaceleakage, and atmospheric diffusion. Exposure of individuals living offsite of nuclear facilitiesafter decommissioning is affected by the diffusion characteristics of radionuclides. Therefore,it is necessary to analyze the radiation dose due to changes in the diffusion characteristics ofradionuclides. In this study, an analysis of radiation due to changes in groundwater characteristicswas performed. Radionuclides of 3H, 14C, 99Tc, and 129I were selected as the source terms for theevaluation. Exposure scenario was selected as resident farmer scenario considering all intakepathways. Radiation dose assessment was conducted using RESRAD-OFFSITE, and groundwatercharacteristic input parameters were selected for groundwater flow direction, groundwater andsurface water usage ratio. For other input parameters, literature review was performed. The flowdirection of groundwater was divided into eight directions, groundwater and surface water usageratio was divided into 0.1 units. Based on the selected conditions, the changes in the radiation dosedue to changes in the flow direction of groundwater, groundwater and surface water usage ratiowere analyzed. According to the analysis of the exposure radiation dose about the direction ofgroundwater flow, in case of the flow direction increases from 45° to 90°, the effect of groundwateris eliminated and the radiation dose decreased sharply by 10~10,000 times. From 270° to 315°,the radiation dose increased dramatically, increasing to the same level as the radiation dose in theflow direction of 0°. As a result of the radiation dose analysis according to the groundwater andsurface water usage ratio, 3H decreased by about 1,000 times, 99Tc, and 129I by about 10,000 times,as the ratio of groundwater decreased. However, for 14C, there was no change in the radiation dosewhen the groundwater usage ratio reached zero. The results of this study can be used to selectinput parameters related to groundwater characteristics in the safety assessment around the siteafter nuclear facility decommissioning in the future.
Abstract
Hundreds of residual radionuclides exist on the site after decommissioning nuclearfacilities, which spread around the site through routes such as groundwater leaching, surfaceleakage, and atmospheric diffusion. Exposure of individuals living offsite of nuclear facilitiesafter decommissioning is affected by the diffusion characteristics of radionuclides. Therefore,it is necessary to analyze the radiation dose due to changes in the diffusion characteristics ofradionuclides. In this study, an analysis of radiation due to changes in groundwater characteristicswas performed. Radionuclides of 3H, 14C, 99Tc, and 129I were selected as the source terms for theevaluation. Exposure scenario was selected as resident farmer scenario considering all intakepathways. Radiation dose assessment was conducted using RESRAD-OFFSITE, and groundwatercharacteristic input parameters were selected for groundwater flow direction, groundwater andsurface water usage ratio. For other input parameters, literature review was performed. The flowdirection of groundwater was divided into eight directions, groundwater and surface water usageratio was divided into 0.1 units. Based on the selected conditions, the changes in the radiation dosedue to changes in the flow direction of groundwater, groundwater and surface water usage ratiowere analyzed. According to the analysis of the exposure radiation dose about the direction ofgroundwater flow, in case of the flow direction increases from 45° to 90°, the effect of groundwateris eliminated and the radiation dose decreased sharply by 10~10,000 times. From 270° to 315°,the radiation dose increased dramatically, increasing to the same level as the radiation dose in theflow direction of 0°. As a result of the radiation dose analysis according to the groundwater andsurface water usage ratio, 3H decreased by about 1,000 times, 99Tc, and 129I by about 10,000 times,as the ratio of groundwater decreased. However, for 14C, there was no change in the radiation dosewhen the groundwater usage ratio reached zero. The results of this study can be used to selectinput parameters related to groundwater characteristics in the safety assessment around the siteafter nuclear facility decommissioning in the future.
참고문헌 (19)
- 한국원자력안전기술원, "주민 피폭선량 평가", KINS, 2016
- AN, "Postremediation Dose Assessment for the Formal Alba Craft Laboratory Site", ANL, TM-55, pp.1996, ~
- ANL., "Radiological Dose Assessment for the Dismantlement and Decommissioning Option for the Heavy Water Components Test Reactor Facility at the Savannah River Site, Aiken, South Carolina", ANL, TM-77, pp.1997, ~
- ANL, "User’s Manual for RESRAD Version 6", ANL, 2001
- ANL, "Benchmarking of RESRAD-OFFSITE: Transition from RESRAD (onsite) to RESRAD-OFFSITE and Comparison of the RESRAD-OFFSITE Predictions with Peer Codes", ANL, TM, pp.06-3, 2006[DOI]
- ANL, "User’s Manual for RESRAD-OFFSITE Version 2", ANL, TM, pp.07-1, 2007[DOI]
- ANL, "Derived Concentration Guideline Levels for Argonne National Laboratory̓s Building 310 Area", ANL, TM, pp.11-4, 2011[DOI]
- Byon J, "Study on the soil evaluation methodology of on and offsite Kori Unit 1", Ann. Nucl. Energy, 144, pp.107497~ (2020)
- Radiological Characterization of Shut Down Nuclear Reactors for Decommissioning Purposes, "IAEA", ~, pp.IAEA TRS 389 (1998)
- The 2007 Recommendations of the international commission on radiological protection, "ICRP.", ICRP, ~, pp.ICRP Publication 103 (2007)
- Comparison of RESRAD-OFFSITE and NORMALYSA software tools for the Tessenderlo test case, "Koliabina D", ~ (2018)
- Mathuthu M, "Modelling of Radiological Health Risks from Gold Mine Tailings in Wonderfonteinspruit Catchment Area, South Africa", Int. J. Environ. Res. Public Health, 13, pp.570~ (2016)
- Licensing, Requirements for Land Dissposal of Radioactive Waste, "NRC", ~, pp.NUREG-0782 (1981)
- Long-Lived Activation Products in Reactor Materials, "NRC", ~, pp.NUREG (1984), CR-3474
- Development of Probabilistic RESRAD 6.0 and RESRAD-BUILD 3.0 Computer Code, "NRC", ~, pp.NUREG (2000), CR-6697
- Consolidated NMSS Decommissioning Guidance, Characterization, Survey, and Determination of Radiological Criteria, "NRC", ~, pp.NUREG-1757 (2002)
- NRC, "User’s Guide for RESRAD-OFFSITE", NUREG, 2015
- NRC, "User’s Manual for RESRAD-OFFSITE Code Version 4", NUREG, 2020
- Rafique Q, "Modeling Radiation Doses for a Hypothetical Contaminated Site Using RESRAD-OFFSITE Code Faisalabad, Pakistan", The Nucleus, 54, pp.33~37 (2017)