The new methodologies to derive discharge limits considering operational flexibility according to international safety standards were developed to help reduce the environmental releases of radioactive effluents from nuclear power plants (NPPs). To overcome the limitations of the two existing methods to set up discharge limits assuming a specific statistical distribution of the effluent discharge, two modified equations were newly proposed to directly derive a particular discharge limits corresponding to the target ‘compliance probability’ based on the actual annual discharge data for a specific NPP and radionuclide groups. By applying these to the actual yearly discharge data of 14 Korean NPPs for 7 radionuclide groups for the past 20 years, the applicability of two new methodologies to actual cases was demonstrated. The ‘characteristic value’ with approximately a 90% compliance probability for each Korean NPP and radionuclide group was proposed based on the results. The new approaches for setting up the discharge limits and the characteristic values developed in this study are expected to be effectively utilized to foster operator's efforts to progressively reduce the environmental releases of radioactive effluents of NPPs relative to the previous discharge data considering operational flexibilities.

开发了根据国际安全标准考虑操作灵活性的排放限制的新方法，以帮助减少核电厂 (NPP) 放射性流出物的环境排放。为克服现有两种设定排放限值方法的局限性，假设出水排放量具有特定的统计分布，新提出了两个修正方程，以根据实际年度直接推导出与目标“合规概率”相对应的特定排放限值。特定核电厂和放射性核素组的排放数据。通过将这些应用于过去 20 年 7 个放射性核素组的 14 个韩国核电厂的实际年排放数据，证明了两种新方法对实际案例的适用性。根据结果​​提出了每个韩国 NPP 和放射性核素组的符合概率约为 90% 的“特征值”。在本研究中制定的排放限值和特征值的新方法预计将被有效利用，以促进运营商努力逐步减少核电厂放射性流出物的环境排放，相对于之前的排放数据，考虑到运营灵活性。