Kori Unit 1 was permanently shut down on June 18, 2017. Since then, Korea is actively preparing for the decommissioning of the nuclear power plant. Because decommissioning work is performed in a radioactive environment, worker radiation exposure is a significant consideration. In this study, worker radiation exposure is evaluated during the steam generator, one of the heavy components of nuclear power plant, dismantling process. A radiation evaluation for the dismantling process is performed using the code RESRAD-BUILD. A steam generator dismantling scenario and optimal cutting method are designed to evaluate worker radiation exposure, considering pipe dimensions, cutting tool speed, and experience in steam generator replacement. The evaluation results are derived for each work type and year. As a result of the evaluation, worker radiation exposure is 7.5 man-mSv at the year of planned decommissioning.

中文翻译：

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古里1号机组蒸汽发生器拆除过程中工人辐射暴露评估

古里1号机组于2017年6月18日永久关闭。此后，韩国积极准备核电站退役。由于退役工作是在放射性环境中进行的，因此工人的辐射暴露是一个重要的考虑因素。在这项研究中，评估了蒸汽发生器（核电站重型部件之一）拆卸过程中工人的辐射暴露情况。使用代码 RESRAD-BUILD 执行拆除过程的辐射评估。蒸汽发生器拆卸场景和最佳切割方法旨在评估工人的辐射暴露情况，考虑管道尺寸、切割工具速度和蒸汽发生器更换经验。评估结果是针对每种工作类型和年份得出的。评估结果显示，计划退役当年工人辐射暴露量为 7.5 人毫西弗。