경수로 증기발생기 계획예방정비 작업자 피폭선량 전산해석 정확도 향상방안 분석
An Analysis of the Improvement Method for the Dosemap Calculation during Overhaul of PWR Steam Generator
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During the planning and overhaul of the PWR steam generator, a study was conducted to implementa highly accurate dose map. In the overhaul period, the worker is exposed to the CRUD on the inner surface of thesteam generator chamber, and the coolant source remains in the pipe. A dose map was generated by performingMCNP computational analysis with the CRUD and coolant source term derived from the theoretical calculation. Asa result of comparison with the measurement results, an average of 42% underestimation was confirmed. Based onthe measurement results before and after the nozzle dam was installed at the maximum dose rate point of the steamgenerator’s water chamber, the result of the computational analysis that corrected the influence of the CRUD andcoolant source term was overestimated by 14% compared to the measurement results. In conclusion, due to correctingand evaluating the source term based on the field measurement data, the accuracy improved by 28% compared to thecase without correcting.
Abstract
During the planning and overhaul of the PWR steam generator, a study was conducted to implementa highly accurate dose map. In the overhaul period, the worker is exposed to the CRUD on the inner surface of thesteam generator chamber, and the coolant source remains in the pipe. A dose map was generated by performingMCNP computational analysis with the CRUD and coolant source term derived from the theoretical calculation. Asa result of comparison with the measurement results, an average of 42% underestimation was confirmed. Based onthe measurement results before and after the nozzle dam was installed at the maximum dose rate point of the steamgenerator’s water chamber, the result of the computational analysis that corrected the influence of the CRUD andcoolant source term was overestimated by 14% compared to the measurement results. In conclusion, due to correctingand evaluating the source term based on the field measurement data, the accuracy improved by 28% compared to thecase without correcting.