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,对现有临界实验装置(YSR)的堆芯进行了设计改造,改造完毕后在该装置上开展了栅距变化对反应性的影响实验。栅距变化对反应性的影响系列实验是在满装载621根燃料棒不变的情况下,模拟燃料棒在不同栅距(16 mm、18 mm和20 mm)的栅格板和不同浓度(301.3 g/L、255.5 g/L和209.85 g/L)下系统k_(eff)的变化规律,实验按照溶液浓度由浓向稀 Spent fuel dissolver is the key core equipment of the reprocessing plant. In order to meet the requirements of the nuclear criticality safety experimental research, the core of the existing critical experimental equipment (YSR) was designed and rebuilt. After the reconstruction, the grid Effect of variation on reactivity experiments. Effect of variation of pitch on reactivity The series of experiments were carried out on a grid plate with different pitch (16 mm, 18 mm and 20 mm) and different concentrations (301.3 g / L, 255.5 g / L and 209.85 g / L, respectively). The experimental results showed that the concentration of the solution k