Abstract
Based on the U.S. standard decommissioning procedure guidance manual, Multi-Agency Radiation Site Survey and Investigation Manual (MARSSIM), DCGL (Derived Concentration Guideline Level) can be used to classify contaminated sites and suggests a methodology for assessing site deregulation safety as an essential criterion for determining decontamination activities. In this study, area factors for DCGLEMC, which is DCGL applicable in hot spot, were derived by adjusting the contaminated area at the Kori Unit 1, the first commercial Nuclear Power Plant (NPP) in South Korea. DCGLW and DCGLEMC were investigated for Kori Unit 1 according to changes in preliminary contaminated baseline area including the area of Unit 2. Area factors for surface soil were divided into scenarios, gamma and beta emitters. Sensitive parameters and exposure pathways were identified for each specific contaminated area. Additionally, the trend of DCGLEMC was analyzed in the industrial worker scenario due to baseline area and contaminated area changes.
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