대표인 개념 도입에 따른 확률론적 선량평가 시 국내 원자력발전소 주변일반인 섭취선량 변화 분석
Analysis of the Ingestion Dose Change of the General Public around Korean Nuclear Power Plants by Applying Probabilistic Dose Assessment Methodology Based on Representative Person Concept
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초록
The International Commission on Radiological Protection recommended the representativeperson concept and the newly proposed probabilistic dose assessment methodology. As a probabilisticmethodology is newly proposed, it is necessary to analyze the tendency of change in dose when applyingthe methodology. Existing dose assessment experience showed that over 90% of the dose was dueto food ingestion during normal operation of nuclear power facilities, and therefore, the tendency ofchange in dose can be judged through the ingestion dose assessment. In this study, probabilistic doseassessment was performed on a trial basis for the ingestion exposure pathways. Then, the values werecompared with the deterministic dose assessment results to analyze the change trends of dose. Factorssuch as source term, exposure pathway, atmospheric dispersion factor, and intake were considered inthe dose assessment. A single APR-1400 unit was assumed as the source term. The exposure pathwayswere selected based on the model specified in the domestic regulatory guidelines. The atmosphericdispersion factor was assessed using the XOQDOQ code for the actual agricultural production area. For intake, domestic data was analyzed based on raw data from the National Health and NutritionExamination Survey. Probabilistic dose assessment was performed by applying the Monte Carlomethodology to the analyzed intake distribution. As a result of the probabilistic dose assessment, theingestion dose was 5.56×10-3 mSv y-1, which was 2.3% smaller than the deterministic dose assessmentresult. These differences appeared mainly for the younger age groups and the exposure pathways relatedto liquid effluents and were judged to be due to the small number of samples and wide variation in intakedistribution. It is judged that it is necessary to systematize the distribution data of variables such as intakefor more accurate probabilistic dose assessment in the future. The results of this study can be used asbasic data when introducing the representative person concept in Korea in the future.
Abstract
The International Commission on Radiological Protection recommended the representativeperson concept and the newly proposed probabilistic dose assessment methodology. As a probabilisticmethodology is newly proposed, it is necessary to analyze the tendency of change in dose when applyingthe methodology. Existing dose assessment experience showed that over 90% of the dose was dueto food ingestion during normal operation of nuclear power facilities, and therefore, the tendency ofchange in dose can be judged through the ingestion dose assessment. In this study, probabilistic doseassessment was performed on a trial basis for the ingestion exposure pathways. Then, the values werecompared with the deterministic dose assessment results to analyze the change trends of dose. Factorssuch as source term, exposure pathway, atmospheric dispersion factor, and intake were considered inthe dose assessment. A single APR-1400 unit was assumed as the source term. The exposure pathwayswere selected based on the model specified in the domestic regulatory guidelines. The atmosphericdispersion factor was assessed using the XOQDOQ code for the actual agricultural production area. For intake, domestic data was analyzed based on raw data from the National Health and NutritionExamination Survey. Probabilistic dose assessment was performed by applying the Monte Carlomethodology to the analyzed intake distribution. As a result of the probabilistic dose assessment, theingestion dose was 5.56×10-3 mSv y-1, which was 2.3% smaller than the deterministic dose assessmentresult. These differences appeared mainly for the younger age groups and the exposure pathways relatedto liquid effluents and were judged to be due to the small number of samples and wide variation in intakedistribution. It is judged that it is necessary to systematize the distribution data of variables such as intakefor more accurate probabilistic dose assessment in the future. The results of this study can be used asbasic data when introducing the representative person concept in Korea in the future.
참고문헌 (22)
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