乏燃料溶解器是后处理厂的关键核心设备,为满足核临界安全实验研究的要求,在完成栅距变化系列实验的基础上,选取最佳栅距作为模拟溶解系列实验的栅格板,在该临界装置上开展了模拟溶解系列实验对反应性的影响,研究固体燃料棒不断溶解到液体燃料过程中系统k_(eff)的变化规律。模拟溶解系列实验是在栅距为18 mm不变的情况下,通过对大量方案进行理论计算和分析,从 In order to meet the requirements of the nuclear criticality safety experimental study, based on the series of experiment of pitch variation, the optimal pitch was selected as the grid plate for the simulated dissolution series experiments. The influence of simulated series of dissolution experiments on the reactivity was carried out on this critical device, and the variation of k eff in the process of continuous dissolution of solid fuel rods into liquid fuel was studied. The experiment of simulating and dissolving series is carried out theoretically and quantitatively under a lot of schemes under the condition of a constant pitch of 18 mm,