氦-3含量对铀吸、放氚特性的影响

Effects of helium-3 content on absorption and desorption tritium of uranium bed

采用定容吸/放氢的方法研究了老化时间4.7年的储氚铀床的吸放氚特性,探讨不同氦-3释放量对铀床吸氚速率的影响规律,利用物理气相传输法(PVT)方法测得铀床在不同温度下(653、673、683及693 K)的解吸氚压力-时间曲线(P-t曲线),铀床在室温不同氦-3含量下的吸氚曲线,并分析铀床室温吸氚速率。结果表明,氚化铀经过长时间储氚后,解吸氚后会有大量的氦-3释放,解吸过程为吸热过程,氦-3含量对铀床的可逆吸附容量影响较小,长时间的老化不影响铀床贮氚性能,当氦-3含量小于5%时,老化铀床的吸氚速率会大幅增加。

The tritium absorption and desorption characteristics of uranium bed with aging time of 4.7 years were studied by constant volume absorption/dehydrogenation method.The influence of different helium-3 release on the tritium absorption rate in the uranium bed was studied.The tritium desorption pressure-time(P-t)curves of the uranium bed at different temperatures(653,673,683 and 693 K)were measured by physical vapor transport(PVT).The tritium absorption curves of the uranium bed at room temperature with different helium-3 contents were analyzed,and the tritium absorption rate at room temperature was analyzed.The results show that the tritiated uranium still has a fast desorption rate after long time storage of tritium.The tritium absorption rate is very high though large amount of helium-3 has been released during the desorption of tritium.The content of helium-3 has little effect on the reversible adsorption capacity of the uranium bed,and the long time aging does not affect the tritium storage properties of the uranium bed.When helium-3 content is less than 5%,the tritium absorption rate of the aged uranium bed increases substantially.