Abstract
In the field of safety regulation systems for the decommissioning of nuclear facilities, a reliable method for ensuring compliance with the criterion of site release is an important technical issue to be resolved in Japan. Considering that kriging can consider the spatial correlation of radioactivity concentrations between different points, we propose a method of applying kriging to ensure compliance with the site release criterion. Estimated radioactivity concentrations exhibit uncertainty, which results in a certain probability of the occurrence of decision errors regarding site release. We describe a method for calculating the uncertainty as a function of the number of measurement points and establish a minimum number of measurement points required for a given error probability. We applied the proposed method and a conventional statistical method to two sample cases. It was observed that the proposed method appropriately estimated the mean radioactivity concentration even if the measurement points were distributed inhomogeneously. This method was observed to lead to an efficient measurement requiring fewer measurement points relative to the conventional statistical method when spatial correlation existed.
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