[3C05-07] Technologies for Dismantling, Decontamination & Evaluation 1

[3C06] Development of dose evaluation method for confirmation of completion of decommissioning

(1)Study on validation method for evaluated radioactivity distribution

*Taro Shimada¹, Kazuji Miwa¹, Toshihisa Sasaki², Seiji Takeda¹ (1. JAEA, 2. V.I.C.)

Keywords:confirmation of completion of decommissioning, radioactivity distribution, kriging, external drift, scoping survey

The authors are developing a methodology for confirming that public dose using the site after site release will be in compliance with the dose criteria based on the radioactivity distribution at the termination of the decommissioning of nuclear facilities. In a previous study, it was confirmed that kriging with external drift combined with scoping survey and representative measurement can evaluate the radioactivity distribution. However, the issue that evaluated distribution should be validated from the viewpoint of sufficient points of representative measurement remained. Therefore, we developed the method for validation that mean absolute error (MAE) between each measured value and evaluated value is less than a reference value of MAE between an average of measured values and each measured value. The method was applied to supposed distributions and it was confirmed that some of the evaluated distributions were validated.