학술논문
측정과 연계한 원전 주변 주민선량평가 연구 / A Study on the Off-site Dose Assessment at NPPs based on the Measurement
Document Type
Dissertation/ Thesis
Author
Source
Subject
Language
Korean
Abstract
대기확산인자는 주민선량을 평가하는데 있어 매우 중요한 인자로서 원전 주변 환경에서 방사성핵종의 방출량과 방사성물질농도로부터 구할 수 있다. 국내 원전에서 대기확산인자 선정 시에 경수로의 경우 Reg Guide 1.109 모델을 사용하며, 중수로의 경우 삼중수소농도를 측정하여 그로부터 대기확산인자를 유도하여 사용한다.이러한 대기확산인자의 보수성은 결과적으로 주민선량평가에 있어 오차의 원인으로 작용하기 때문에 대기확산인자의 합리적인 산정이 필요하게 되었다.대기확산인자는 삼중수소농도를 측정하여 그 측정값으로부터 유도하여 계산할 수 있다. 그렇기 때문에 대기확산인자의 합리적인 재산정을 위해서는 삼중수소농도 측정이 매우 중요하다고 할 수 있다.환경준위의 삼중수소는 분석방법이나 절차에 따라서 오차를 발생시킬 수 있기 때문에 정확한 삼중수소농도 측정을 위해서는 무엇보다 삼중수소 측정과 관련한 절차의 확립이 우선적으로 이루어져야 한다.삼중수소의 측정을 통해서 과대평가 되고 있는 대기확산인자를 현실적인 수준으로 재산정 할 수 있고 대기확산인자에 포함된 지나친 보수성을 제거하여 방사성유출물 관리에 유연성을 제공할 수 있다. 또한, 측정과 연계하여 주민피폭선량평가를 수행함으로써 지나치게 높게 평가된 원전에 의한 주민피폭선량을 합리적인 수준으로 줄일 수 있으며 결과적으로 원전에 대한 사회적 수용성도 증진시킬 수 있을 것으로 보인다.
The atmospheric diffusion factor being very important in the off-site dose assessment, can be derived from the released amount of radionuclide and the measured radioactivity of the released radionuclide at the Environment.When calculating the atmospheric diffusion factor in domestic nuclear power plant of light-water reactor, Reg Guide 1.109 model was used. However, In case of heavy water reactor, after tritium activity was measured the atmospheric diffusion factor was derived from it.The atmospheric diffusion factor's conservativeness cause much error in off-site dose assessment. Therefore, reasonable computation of the atmospheric diffusion factor is needed.The atmospheric diffusion factor can calculate deriving from tritium activity measurement value. Therefore, tritium activity measuring is very important for The atmospheric diffusion factor's reasonable re-computation.Tritium of environment sub-officer can generate error according by analysis method or procedure. For such reason, establishment of formality that is connected to tritium measurement preferentially must consist for correct tritium activity measurement.The measurement of tritium can estimate the atmospheric diffusion factor realistically, and provide the flexibility on management on radiation effluence by excluding the conservative criteria involved in the atmospheric diffusion factor.At the same time, it is possible to reduce excessively esitmated off-site dosimetry to reasonable amount by performing off-site dose assessment from this measurement. Thus, it is highly expected that public acceptance on nuclear power plant can be increased.
The atmospheric diffusion factor being very important in the off-site dose assessment, can be derived from the released amount of radionuclide and the measured radioactivity of the released radionuclide at the Environment.When calculating the atmospheric diffusion factor in domestic nuclear power plant of light-water reactor, Reg Guide 1.109 model was used. However, In case of heavy water reactor, after tritium activity was measured the atmospheric diffusion factor was derived from it.The atmospheric diffusion factor's conservativeness cause much error in off-site dose assessment. Therefore, reasonable computation of the atmospheric diffusion factor is needed.The atmospheric diffusion factor can calculate deriving from tritium activity measurement value. Therefore, tritium activity measuring is very important for The atmospheric diffusion factor's reasonable re-computation.Tritium of environment sub-officer can generate error according by analysis method or procedure. For such reason, establishment of formality that is connected to tritium measurement preferentially must consist for correct tritium activity measurement.The measurement of tritium can estimate the atmospheric diffusion factor realistically, and provide the flexibility on management on radiation effluence by excluding the conservative criteria involved in the atmospheric diffusion factor.At the same time, it is possible to reduce excessively esitmated off-site dosimetry to reasonable amount by performing off-site dose assessment from this measurement. Thus, it is highly expected that public acceptance on nuclear power plant can be increased.