30%TBP-煤油循环使用过程中的辐解行为

为了了解溶剂在乏燃料后处理真实使用过程的辐解稳定性,对比研究了30%TBP-煤油-HNO3体系在γ和α的静态累积辐照和动态循环辐照情况下的辐解行为。研究结果表明:静态累积辐照所引起的溶剂辐解产物生成量、钚保留和钌保留等性能的变化比动态循环辐照明显;当辐照吸收剂量达到1.0×105 Gy(相当于动态循环辐照20次)时,静态累积辐照引起的溶剂钚保留值10倍于动态循环辐照,证实了在乏燃料后处理工艺过程中,通过溶剂的酸碱洗涤,去除HDBP、H2MBP等主要辐解产物,可提高溶剂的循环使用寿命。同时研究结果显示,溶剂的α辐照损伤大于γ辐照。

Effects of Solvent Recycling on Radiolysis Behaviors of 30%TBP-Kerosene

In order to understand the irradiation stability of solvent in the real Purex process, the radiolysis behaviors of 30%TBP-kerosene-HNO₃ during α or γ static-state continuous and dynamic recycling irradiation were studied. The results show that the static-state continuous irradiation has more prominent effect on degradation products, plutonium and ruthenium retention in the organic phase than dynamic recycling irradiation. When the absorbed dose is 1.0×10⁵ Gy（the number of recycling is 20）, plutonium retention by static-state continuous irradiation is 10 times as large as by dynamic recycling irradiation. It is approved that the number of recycling will be more by the regular cleanup of degradation products (such as HDBP, H₂MBP, and so on) before its recycling in the real Purex process, where the solvent is recycled after alkaline cleanup followed by acidification. On the other hand, the radiolytic degradation of 30%TBP-kerosene-HNO₃ by α irradiation is higher than γ irradiation.