CRUDTRAN 코드를 이용한 국내 원전에서의 해체 방사선원항 예측 연구

Abstract

It has been emphasized the importance of developing source term assessment technology of decontamination and decommissioning owing to the permanent shutdown of the Kori #1, the life extension of the Wolsong #1 and the increase of deteriorated nuclear plants. This study sought the characteristics of materials of the primary system which has been the source of corrosion products based on the type of domestic NPPs. Among the nuclear plants, the study selected the Kori #1, a Westinghouse type nuclear plant to be decommissioned. For the study, the behavior mechanism of corrosion products in the primary system of the Kori #1 was analyzed, and the volume of activated corrosion products in the primary system was assessed based on domestic plant data with the CRUDTRAN code used to predict the volume. From the assessment, it was able to predict a trend of and , i.e., activated corrosion products according to the operating cycle; and the similarity was confirmed by comparing the estimated values with the code and the actually measured values. It is expected that the study would be utilized in predicting radiation exposure of workers performing maintenance and repairs in high radiation areas and in selecting the process of decontaminations and decommissioning in the primary system. It is also expected that in the future it would be used as the baseline data to estimate the volume of radioactive wastes when decommissioning a nuclear plant in the future, which would be an important criterion in setting the level of radioactive wastes used to compute the quantity of radioactive wastes.