A scenario of core disruptive accident for Japan sodium-cooled fast reactor to achieve in-vessel retention
A scenario of core disruptive accident for Japan sodium-cooled fast reactor to achieve in-vessel retention
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日本钠冷快堆堆芯破坏事故场景实现堆内滞留
DOI：
10.1080/00223131.2013.877405
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发表时间：
2014
影响因子：
1.2
通讯作者：
K. Koyama
中科院分区：
文献类型：
--
作者：
Tohru Suzuki;K. Kamiyama;H. Yamano;S. Kubo;Y. Tobita;R. Nakai;K. Koyama
作为最有前途的钠冷快堆概念，日本原子能机构（JAEA）选择了先进的环式快堆，即所谓的JSFR。JSFR的设计扩展条件（DEC）的安全设计要求是预防严重事故和减轻严重事故后果。为了减轻严重事故后果，特别需要针对假定堆芯破裂事故（CDA）的容器内滞留（IVR）。为了研究这些安全要求的充分性，应构建CDA场景，在该场景中，评估功率偏移的消除和退化堆芯材料的容器内冷却，以实现IVR。在本研究中，导致IVR失败的因素被确定通过创建现象学图，并对他们的设计措施的有效性进行了评估的基础上，实验数据和计算机模拟。这是一个前所未有的方法来构建一个CDA场景，是一个有效的方法来客观地调查导致IVR失败的因素和针对他们的设计措施。得出的结论是，机械/热故障的反应堆容器，由于功率偏移/热负荷，可以避免适当的设计措施，并获得了清晰的愿景，实现IVR。
As the most promising concept of sodium-cooled fast reactors, the Japan Atomic Energy Agency (JAEA) has selected the advanced loop-type fast reactor, so-called JSFR. The safety design requirements of JSFR for Design Extension Condition (DEC) are the prevention of severe accidents and the mitigation of severe-accident consequences. For the mitigation of severe-accident consequences, in particular, the In-Vessel Retention (IVR) against postulated Core Disruptive Accidents (CDAs) is required. In order to investigate the sufficiency of these safety requirements, a CDA scenario should be constructed, in which the elimination of power excursion and the in-vessel cooling of degraded core materials are evaluated so as to achieve IVR. In the present study, the factors leading to IVR failure were identified by creating phenomenological diagrams, and the effectiveness of design measures against them were evaluated based on experimental data and computer simulations. This is an unprecedented approach to the construction of a CDA scenario, and is an effective method to objectively investigate the factors leading to IVR failure and the design measures against them. It was concluded that mechanical/thermal failures of the reactor vessel due to power-excursion/thermal-load could be avoided by adequate design measures, and a clear vision for achieving IVR was obtained.