Abstract
In the evaluation of radiation safety standards, representative, average or conservative parameter values are set for dose calculation, and it is expected that excessive conservatism may be occasionally included in the standards already established. In this study, we attempted to quantitatively evaluate the 'factor of conservatism' for parameters used in the dose calculations for an actual case of clearance level calculations in Japan. The 'factor of conservatism' was calculated using the selected value for the parameter actually applied in the clearance level calculation and the expected values evaluated from the probability distribution. As a result, it was estimated that the 'factor of conservatism' for the parameters used in the clearance level calculation for the main nuclear facilities in Japan is approximately 1 to 7.
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