The effects of nearby residents and the public by the residual contamination from the decommissioning of nuclear facilities should comply with the dose criteria, and whether additional remediation action is necessary from the ALARA perspective must be determined. Therefore, we analyzed the requirements of ALARA action levels and performed preliminary ALARA evaluation. The ratio of residual contamination concentration to DCGL was calculated for the basement fill and the building occupancy mode. The results showed that the additional remediation actions below DCGL are not justified. In addition, we analyzed the effect of remediation area. It was noted that the increase of the remediation area showed a positive correlation with the Conc/DCGL value in the basement fill mode. On the other hand, in the building occupancy mode, since the floor area of the building is the target of remediation and has the effect of increasing the same as the evaluation area of the building occupants, but due to the difference in the amount of increase, the Conc/DCGL showed a negative correlation. We expect the approach and method of ALARA evaluation can be utilized for concrete cost-benefit calculation during the decommissioning or at the time of remediation.

核设施退役残留污染对附近居民和公众的影响应符合剂量标准，并且必须从 ALARA 的角度确定是否需要采取额外的补救措施。因此，我们分析了 ALARA 行动水平的要求，并进行了初步的 ALARA 评估。计算了地下室填充物和建筑物占用模式的残留污染物浓度与 DCGL 的比率。结果表明，低于 DCGL 的额外补救措施是不合理的。此外，我们分析了整治区域的效果。值得注意的是，修复面积的增加与地下室填充模式下的 Conc/DCGL 值呈正相关。另一方面，在楼宇占用模式下，由于建筑物的建筑面积是整治的目标，与建筑物居住者的评价面积具有相同的增加效果，但由于增加量的不同，Conc/DCGL呈负相关。我们期望 ALARA 评估的方法和方法可以用于退役期间或修复时的具体成本效益计算。