乏燃料后处理厂草酸钚沉淀器临界安全分析研究

本文对乏燃料后处理厂中钚尾端工艺环节的关键设备草酸钚沉淀器进行了临界控制方法和参数的详细分析。针对连续沉淀器的工艺和结构特点,对易裂变物质的状态进行了一系列分析,比较了均匀溶液和悬浮颗粒溶液反应性的差别。对单个沉淀器和多个沉淀器并行工作的情况分别进行了临界安全分析,并分别研究了不含中子毒物、布置中子毒物层以及布置中子毒物棒等情况下能达到的最大处理能力。选取了临界安全基准实验国际评价中的相似实验方案进行了验证计算,分析了所用程序计算此类问题的不确定度。本文开展的临界安全分析研究总结了连续沉淀器临界安全控制的规律性结论,可为后续连续沉淀器的工艺设计及今后的工程应用提供参考。

Criticality Safety Analysis Research for Plutonium Oxalate Precipitator of Spent Fuel Reprocessing Plant

This paper makes a detail analysis on criticality control method and parameter for plutonium oxalate precipitator of plutonium conversion technologic stage in spent fuel reprocessing plant.Based on the technologic and structural characteristic of successive precipitator,a series of analysis is carried out on fissile material state,and the reactivity difference is compared between homogeneous and suspending particle solution.Criticality safety analysis is made for both single precipitator and parallel working multi-precipitator and the probable maximum processing capacities is analyzed for conditions without neutron poison,with neutron poison layer and with neutron poison rods.Similar experiment cases are selected from the International Criticality Safety Benchmark and the uncertainty of the calculation code is analyzed when used to calculate this type of problems.The criticality safety analysis research in this paper summarizes a regularity conclusion on the criticality safety control for successive precipitator,and can provide reference for the following technologic design and engineering practice.