Distribution of radioactive nuclides of boring core samples extracted from concrete structures of reactor buildings in the Fukushima Daiichi Nuclear Power Plant
Distribution of radioactive nuclides of boring core samples extracted from concrete structures of reactor buildings in the Fukushima Daiichi Nuclear Power Plant
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DOI：
10.1080/00223131.2014.915769
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发表时间：
2014-07-01
影响因子：
1.2
通讯作者：
Murata, Hirotoshi
中科院分区：
文献类型：
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作者：
Maeda, Koji;Sasaki, Shinji;Murata, Hirotoshi
自2011年3月福岛第一核电站发生严重事故以来，反应堆建筑物（RB）内的混凝土表面一直暴露在放射性污染物中。释放的放射性核素仍然太高，不允许进入RB的某些区域，从而无法评估损坏情况，也无法恢复失去的安全功能、进行退役活动等。为了澄清1号、2号和3号机组RB中的污染情况，收集了污染物样品并进行了分析，以确定表面放射性核素浓度并确定样品中放射性核素分布的特征。特别是，对2号机组钻孔芯样进行了去污试验，以定量确定几种基本去污技术的有效性。作为测试的结果，该样品的放射性水平降低，去除了样品表面附近存在的约97%的污染物，并且对于钻孔岩心样品，证实了污染物主要具有表面固定污染物的特征。
Since the start of the severe accidents at the Fukushima Daiichi Nuclear Power Plant in March 2011, concrete surfaces within the reactor buildings (RBs) have been exposed to radioactive contaminants. Released radionuclides still remain too high to permit entry into some areas of the RBs to allow the damage to be assessed and to allow carrying out the restoration of lost safety functions, decommissioning activities, etc. In order to clarify the situation of this contamination in the RBs of Units 1, 2 and 3, samples of contaminants were collected and subjected to analyses to determine the surface radionuclide concentrations and to characterize the radionuclide distributions in the samples. Especially, decontamination tests on the boring core sample of Unit 2 were conducted to quantitatively determine the effectiveness of several basic decontamination techniques. As a result of the tests, the level of radioactivity of this sample was reduced with the removal of similar to 97% of the contamination present near the sample surface, and it was confirmed for the boring core sample that the contamination mainly had the characteristics of fixed contamination of the surface.