氦-3对Zr_(0.85)Ti_(0.15)Co合金吸氚特性影响研究

Effect of Helium-3 on Tritium Absorption in Zr_(0.85)Ti_(0.15) Co Alloy

通过铀床向Zr_(0.85)Ti_(0.15)Co床转移氚过程中,研究氦-3对Zr_(0.85)Ti_(0.15)Co合金吸氚特性的影响,并结合Ortman模型分析氦-3影响机理。结果表明:氦-3对床体的屏蔽效应明显影响粉末的吸附性能,但屏蔽效应并不能完全抑制Zr_(0.85)Ti_(0.15)Co的吸氚反应,覆盖现象严重时其仍能在较低的速率持续吸氚直至吸附完全;氦-3浓度较低时,吸氚完成时间主要由氦-3浓度影响,而氦-3浓度较高时,主要由初始氚分压影响;氦-3对Zr_(0.85)Ti_(0.15)Co吸氚的屏蔽过程分为整体流阶段和扩散散流阶段,Ortman模型可较好的预测整体流阶段的氦-3屏蔽压强。

During tritium transfer from uranium bed to Zr_(0.85)Ti_(0.15)Co bed,the effect of helium-3 on the tritium absorption performance of Zr_(0.85)Ti_(0.15)Co alloy was studied,and the mechanism of helium-3 influence was analyzed by combining with the Ortman model.The results showed that helium blanketing effect affected the adsorption performance of Zr_(0.85)Ti_(0.15)Co alloy significantly,but the blanketing effect could not completely inhibit the tritium absorption reaction,and it could continue to absorb tritium at a low rate until the adsorption was completed.The completion time of tritium absorption was mainly affected by helium-3 concentration when helium-3 concentrations was low,while when the helium concentration was high,it was mainly affected by the initial tritium partial pressure.Helium-3 blanketing process included two steps,that was“bulk flow”and“diffusion flow”,and Ortman model could predict the helium shielding pressure in“bulk flow”.