Release behavior of bred tritium from LiAlO2
Release behavior of bred tritium from LiAlO2
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DOI：
10.1016/j.jnucmat.2004.07.032
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发表时间：
2004-10
影响因子：
3.1
通讯作者：
M. Nishikawa;T. Kinjyo;T. Ishizaka;S. Beloglazov;T. Takeishi;M. Enoeda;T. Tanifuji
中科院分区：
文献类型：
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作者：
M. Nishikawa;T. Kinjyo;T. Ishizaka;S. Beloglazov;T. Takeishi;M. Enoeda;T. Tanifuji
增殖氚向包层吹扫气中的释放行为主要受氚生成反应、氚在药柱中的扩散、氚与辐照缺陷的相互作用、吸收等体相现象以及吹扫气中分子态氢与药柱表面氚的吸附、同位素交换反应等表面现象控制（同位素交换反应1）、水蒸气与颗粒表面上的氚之间的同位素交换反应（同位素交换反应2）、以及在添加氢时的水生成反应。根据作者的观察，同位素交换反应2比同位素交换反应1快得多，在用加湿气体吹扫时获得的增殖氚的释放曲线用于估计增殖氚在LiAlO 2中的有效扩散率。由此得到氚在LiAlO 2晶粒中的有效扩散系数DT=2.5×10− 7 exp（−110 [kJ]/RT）[m2/s]。这个方程给出了更大的扩散系数比任何其他的扩散系数目前为止，因为在颗粒表面的传质阻力预计将在本研究的估计过程中被消除。
The release behavior of bred tritium to the blanket purge gas is mainly controlled by such bulk phenomena as tritium forming reaction, diffusion of tritium in grain, interaction of tritium with irradiation defects, and absorption together with such surface phenomena as adsorption, isotope exchange reaction between molecular form hydrogen in purge gas and tritium on grain surface (isotope exchange reaction 1), isotope exchange reaction between water vapor and tritium on grain surface (isotope exchange reaction 2), and water formation reaction at addition of hydrogen. Following the observation of the present authors that the isotope exchange reaction 2 is much faster than the isotope exchange reaction 1, the release curve of bred tritium obtained at purge with humidified gas was used for estimation of the effective diffusivity of bred tritium in LiAlO2. Then, the effective diffusivity of tritium in grain of LiAlO2is obtained as DT=2.5×10−7exp(−110 [kJ]/RT) [m2/s]. This equation gives the larger diffusivity than any other diffusivity presented so far because the mass transfer resistance at the grain surface is expected to be eliminated in the estimation procedure of this study.