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An approach toward evaluation of long-term fission product distributions in the Fukushima Daiichi nuclear power plant after the severe accident

机译:在严重事故发生后福岛Daiichi核电站长期裂变产品分布评估的方法

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The safe completion of the Fukushima Daiichi Nuclear Power Plant decommissioning projects requires that the long-term distributions of fission products (FPs) as well as fuel debris for the entire plant be understood. The fuel debris is going to be removed from the plant under the severe conditions of FPs being scattered during major decommissioning work, and then, the decommissioning projects are going to be terminated by storing safely the removed debris as recovered fertile materials or as materials for final radioactive waste disposal. In order to determine the FP distribution in the plant for the long period from the accident occurrence to the termination of the plant decommissioning, procedures for analyzing short-, medium-and long-term FP behaviors has been proposed. The proposed procedures should be improved by applying the FP data measured in the plant and validated based on the fed-back data. Then, the accuracy-improved procedures should be applied to estimate FP distributions during each phase of the decommissioning projects. First the paper outlines the short-, medium-and long-term FP transfer analyses. Then, their applicability and some examples of their validations based on dose rate data of the containment atmosphere monitoring system (CAMS) of Unit 1 are introduced. (195 words)
机译:安全完成福岛Daiichi核电站退役项目要求裂变产品(FPS)的长期分布以及整个工厂的燃料碎片被理解。燃料碎片将在主要退役工作中散落的FPS的严重条件下从工厂中取出,然后,退役项目将通过安全地将废除的碎片作为回收的肥沃材料或最终材料存放或作为最终材料来终止放射性废物处理。为了确定植物中的FP分布,从事故发生到植物退役的终止,已经提出了分析短,中和长期FP行为的程序。通过应用在工厂中测量的FP数据并根据反馈数据进行验证来提高所提出的程序。然后,应在退役项目的每个阶段应用精确改进的程序来估计FP分布。首先,论文概述了短期,中期和长期FP转移分析。然后,引入了基于单元1的容纳气氛监测系统(CAMS)的辅助速率数据的适用性和其验证的一些示例。 (195字)

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