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首页> 外文会议>5th International Symposium on Materials and Reliability in Nuclear Power Plants amp; Symposium on Water Chemistry and Corrosion in Nuclear Power Plants in Asia-2017 amp; 3rd Asian Forum on Material Aging I >Release behavior of Cs and its chemical form during late phase of fukushima daiichi nuclear power plant accident
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Release behavior of Cs and its chemical form during late phase of fukushima daiichi nuclear power plant accident

机译：福岛第一核电站事故后期Cs释放行为及其化学形态

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In order to understand what happened in reality during the Fukushima Daiichi nuclear power plant accident,the phenomena within reactor pressure vessel(RPV)and their discussion with the data of environmental radiation are very important.However,there are few studies with these points of view even six years has passed since the accident.It should be also pointed out that the release behavior of cesium(Cs)has not been examined so far from an aspect of its chemical forms.For this reason,the present study focused on the release mechanisms and chemical forms of 137Cs after March 17-the day when the core state became relatively more stable than before,using the data and information published until now.Concerning the Cs behavior in the RPV,we estimated it based on thermo-hydraulic data in the RPV during the accident,referring to the information of the PHEBUS/FPT3 test on the core degradation with the B4C absorbers.As for the source terms,we referred to the previously-published reports,which evaluated them reversely by the atmospheric dispersion code,WSPEEDI,with the monitoring data at Tokai.It was found that the excess release of 137Cs over 131I,i.e.decrease in the 131I/137Cs ratio,occurred several times for a certain duration after March 17.In addition,a report on the environmental monitoring showed that gaseous 137Cs was measured before March 29 but not after March 30 while the concentration of particulate 137Cs increased drastically after March 30.Based on these findings,it can be inferred that the chemical form of CsBO2 was produced in the RPV by a reaction with the B4C absorbers and that the release of CsBO2 occurred during the Fukushima accident as that had happened in the PHEBUS/FPT3 test.
机译：为了了解福岛第一核电站事故期间发生的实际情况，反应堆压力容器内的现象以及与环境辐射数据的讨论非常重要。然而，基于这些观点的研究很少事故发生已经过去了六年。还应该指出，到目前为止，铯的释放行为还没有从化学形式的角度进行过研究。因此，本研究着眼于释放机理根据迄今发布的数据和信息，在3月17日之后（核心状态比以前更稳定），即137 Cs的化学形式和化学形式。关于RPV中的Cs行为，我们根据RPV中的热液数据进行了估算。发生事故时的RPV，请参阅PHEBUS / FPT3测试中有关使用B4C吸收器进行的芯退化的信息。至于源术语，我们引用了之前发表的报告，利用东海的大气扩散代码WSPEEDI对它们进行反向稀释，并在东海进行了监测。结果发现，在3月17日之后的某个持续时间内，137Cs超过131I的过量释放，即131I / 137Cs的比率降低了。此外，一份有关环境监测的报告显示，在3月29日之前（而不是3月30日之后）测量了气态137Cs，而3月30日之后颗粒137Cs的浓度急剧上升。基于这些发现，可以推断出CsBO2的化学形式RPV是通过与B4C吸收剂反应而产生的，并且CsBO2的释放发生在福岛事故期间，就像PHEBUS / FPT3测试中发生的一样。

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