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Determination of the activation energy of tritium diffusion in ceramic breeders by reactor power variation
Fusion Engineering and Design ( IF 1.7 ) Pub Date : 2021-07-15 , DOI: 10.1016/j.fusengdes.2021.112783
T. Kulsartov , I. Kenzhina , Ye. Chikhray , Zh. Zaurbekova , Ye. Kenzhin , M. Aitkulov , Sh. Gizatullin , D. Dyussambayev

In this work, the analysis of experimental results on the irradiation of lithium ceramics LiTiO is presented. Lithium ceramics samples were irradiated at the WWR-K research reactor (Almaty, Kazakhstan) under continuous pumping conditions at a temperature of ~610°C for ~21 days with a thermal neutron flux of ~5•10 n/(cm•s). During the experiment, the release of tritium-containing molecules (HT, T, HTO and TO) was recorded by a mass-spectrometric method. During the reactor experiment with a frequency of about one to two times a day, a short-term (less than 10 minutes) reduction of reactor power by 25-50 % was conducted, with subsequent regain. In this case, as expected, samples temperature and the released flows of tritium-containing molecules decreased. This mode of reactor operation and obtained data allowed us to propose a method for assessing the temperature dependence of the diffusion coefficient of tritium in ceramics under reactor irradiation. This method assumes that with a rapid change in the reactor power and the sample temperature, the tritium concentration in the surface region does not change much. In contrast, the diffusion coefficient (which has an Arrhenius temperature dependence) varies greatly. It determines the decrease in tritium flows from the sample. In the paper, several sections of reactor power decrease/increase are analyzed, which are used to evaluate the diffusion coefficients of tritium in ceramics under reactor irradiation.

中文翻译:

通过反应堆功率变化测定陶瓷增殖器中氚扩散的活化能

在这项工作中,对锂陶瓷 LiTiO 的辐照实验结果进行了分析。锂陶瓷样品在 WWR-K 研究堆(哈萨克斯坦阿拉木图)连续泵送条件下,在约 610°C 的温度下辐照约 21 天,热中子通量为约 5•10 n/(cm•s) 。实验过程中,通过质谱方法记录了含氚分子(HT、T、HTO和TO)的释放。在每天约一到两次频率的反应堆实验期间,进行了反应堆功率短期(少于10分钟)减少25-50%的操作,随后又恢复。在这种情况下,正如预期的那样,样品温度和含氚分子的释放流量下降。这种反应堆操作模式和获得的数据使我们能够提出一种评估反应堆辐照下陶瓷中氚扩散系数的温度依赖性的方法。该方法假设随着反应堆功率和样品温度的快速变化,表面区域的氚浓度变化不大。相反,扩散系数(具有阿累尼乌斯温度依赖性)变化很大。它确定样品中氚流量的减少。文中对反应堆功率增减的几个阶段进行了分析,用于评价反应堆辐照下氚在陶瓷中的扩散系数。
更新日期:2021-07-15
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