PUREX流程中TBP辐解产物对Pu（Ⅳ）反萃的影响研究
Influences of Radiolytic Products of TBP on the Stripping of Pu（Ⅳ） in PUREX Process
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摘要: PUREX流程中，萃取剂和稀释剂在强辐照场下会发生辐解，部分辐解产物使Pu（Ⅳ）的反萃变得困难。本文通过实验研究，获取了辐解产物与Pu（Ⅳ）保留的比例关系。结果表明，辐解产物磷酸二丁酯（HDBP）与羟胺（HAN）、稀硝酸难以反萃的Pu（Ⅳ）摩尔浓度之比约为2，磷酸一丁酯（H2MBP）与HAN难以反萃的Pu（Ⅳ）的摩尔浓度之比为1~2。结合文献报导，获取了不同辐解产物在PUREX流程中的产生量，从而较系统地比较了各辐解产物对Pu（Ⅳ）反萃的影响程度，并对主要辐解产物在PUREX流程中不同Pu（Ⅳ）反萃工艺段的影响进行了讨论。结果表明：热堆乏燃料后处理流程中对Pu（Ⅳ）反萃造成影响的主要辐解产物为HDBP，快堆乏燃料后处理流程中对Pu（Ⅳ）反萃造成影响的主要辐解产物为HDBP和H2MBP。Abstract: In PUREX process, extractant and diluent are degraded by radiolysis under strong irradiation field. Some of the products of radiolysis make it difficult to strip Pu. In this paper, the ratio of radiolysis products to Pu(Ⅳ) retention was obtained by experimental study. The results show that the molar concentration ratio of HDBP to remaining Pu(Ⅳ) is about 2, and the molar concentration ratio of H2MBP to remaining Pu(Ⅳ) is between 1 and 2. Combining with literature reports, the production of different radiolysis products in PUREX process was obtained, and the effect of different radiolysis products on Pu(Ⅳ) stripping was compared systematically. The influence of main radiolysis products on different Pu(Ⅳ) stripping processes in PUREX process was discussed. The results show that HDBP is the main radiolysis product having impact on the Pu(Ⅳ) stripping in the spent fuel reprocessing process of thermal reactor. HDBP and H2MBP are the main radiolysis products having impact on the Pu(Ⅳ) stripping in the spent fuel reprocessing process of fast reactor.
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Keywords:
- radiolytic products /
- Pu(Ⅳ) stripping /
- PUREX process
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