Recent R&D towards Aqueous Reprocessing of FBR Fuels

Procedia Chemistry Pub Date : 2016-01-01 DOI:10.1016/j.proche.2016.10.018

C. Mallika, N.K. Pandey, Shekhar Kumar, U. Kamachi Mudali

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引用次数: 1

Abstract

The mixed Pu-rich carbide spent fuel with a burn up of 155 GWd/t from the Fast Breeder Test Reactor is being reprocessed in a hot-cell facility by PUREX process. Based on the input from the operation of this facility, R&D activities were carried out to improve the recovery, decontamination factors, economy and to reduce the waste volumes. Reduction of uranyl ions in a continuous flow electrochemical reactor and electrolytic as well as chemical reduction of 4M HNO₃ from liquid waste could be accomplished in continuous mode. Using the optimized parameters, suitable electrolytic cells/experimental setups were designed for the plant capacity of 6 L/h. Studies on the extraction kinetics of Ru with 30% TBP in NPH revealed that better decontamination factor with respect to Ru can be achieved using fast contactors like centrifugal extractors (CEs). Towards developing a spent solvent recovery system to reduce organic waste volumes, a pilot plant was set up, which could recover diluent as top product of distillation column and 40% TBP as bottom product from inactive degraded solvent. A solvent recovery system using short path distillation was also developed for installation in hot cells.

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快堆燃料水后处理研究进展☆

快中子增殖试验堆中燃烧量为155gwd /t的富铂混合碳化物乏燃料，在热电池设施中采用PUREX工艺进行再处理。根据该设施的运作投入，进行了研发活动，以改善回收，净化因素，经济和减少废物量。连续流电化学反应器中铀酰离子的还原和废液中4M HNO3的电解和化学还原均可实现。利用优化后的参数，设计了适合的电解池/实验装置，装置容量为6 L/h。在NPH条件下，30% TBP对Ru的萃取动力学研究表明，使用离心萃取器(CEs)等快速接触器可以获得更好的Ru去污系数。为开发废溶剂回收系统，减少有机废物的排放量，建立了一个中试装置，该装置可以从无活性降解的溶剂中回收稀释剂作为精馏塔的顶部产品，40% TBP作为底部产品。此外，还开发了一种用于热池的溶剂回收系统。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Procedia Chemistry

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