Evaluation of hydrogen permeation rate through zirconium pipe
Evaluation of hydrogen permeation rate through zirconium pipe
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DOI：
10.1016/j.nme.2018.05.008
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发表时间：
2018-08-01
影响因子：
2.6
通讯作者：
Fukada, Satoshi
中科院分区：
文献类型：
--
作者：
Katayama, Kazunari;Izumino, Jyunichi;Fukada, Satoshi
为了稳定地启动聚变反应堆，需要通过外部氚源制备足够量的氚。在高温气冷反应堆（HTGR）中利用中子和锂的核反应生产氚是一种有吸引力的方法。一个重要的问题是高温气冷堆高温条件下的氚限制。用Al2O3 覆盖Li 化合物是一种很有前途的方法，因为Al2O3 中的氢渗透性相当低。此外，由于Zr具有大的吸氢能力，因此预计在Li化合物和Al2O3之间插入Zr可以抑制氚渗透。例如，由Zr-Li化合物-Zr-Al2O3组成的圆柱形多层结构是限制产生的氚的候选结构。为了评估圆柱形锆材料的氢渗透速率，在本工作中，对两个单侧密封锆管样品进行了氢渗透实验。一个样品中的氢气渗透速率与氢气压力的平方根成正比，但在实验前保留一定量氢气的另一样品中，除了氢气渗透方向外，尽管实验步骤几乎相同，但没有表现出明显的压力依赖性。由于观察到Zr中的氢渗透速率比Al2O3中的氢渗透速率快，因此在Zr-Li化合物-Zr-Al2O3的多重限制结构下，Li化合物中生成的氚迅速扩散到Al2O3层内的整个Zr中，并且预期氚稳定地储存在该结构中。
To launch a fusion reactor stably, it is necessary to prepare sufficient amount of tritium by an external tritium source. Tritium production using nuclear reactions by neutron and Li in a high temperature gas-cooled reactor (HTGR) is an attractive method. An important issue is tritium confinement in high temperature conditions of HTGR. Covering Li compound by Al2O3 is a promising method because hydrogen permeability in Al2O3 is quite low. Furthermore, it is expected that inserting Zr between Li compound and Al2O3 suppresses tritium permeation because Zr has a large hydrogen absorption capacity. For example, a cylindrical multilayer structure consisted of Zr - Li compound - Zr - Al2O3 is a candidate structure to confine generated tritium. To evaluate hydrogen permeation rate through cylindrical Zr material, in this work, hydrogen permeation experiments were carried out for two samples of one-side sealed Zr pipe. Hydrogen permeation rate in one sample was proportional to as the square root of hydrogen pressure but that in another sample, which had retained a certain amount of hydrogen before the experiment, did not indicate an obvious pressure dependence regardless of almost the same experimental procedure except hydrogen permeation direction. Since observed hydrogen permeation rate in Zr was faster than that in Al2O3, under the multi confinement structure by Zr - Li compound - Zr - Al2O3, the generated tritium in Li compound diffuses promptly in whole Zr inside Al2O3 layer and it is expected tritium is stored stably in the structure.