水下干式储存取样的乏燃料破损检测技术

介绍了通用的乏燃料破损检测方法, 分析了已有的乏燃料破损检测技术存在的缺陷, 针对其缺陷以及根据自身的需求设计了新的乏燃料破损检测工艺与工作流程, 并介绍了检测样品的测量及样品与乏燃料包壳状态的判断依据。 实际应用结果表明: 该技术可以在水下实现一次对一批乏燃料进行逐个取样, 每个样品对应一盒确定的乏燃料, 检测效率高; 该采样系统对乏燃料的操作在水下进行, 现场辐射防护容易满足。 In the present article, several previous methods for damage detection of spent fuel assembly, as well as the existing limitations of these methods are reviewed. A new sampling system, including the working procedure and operating schedule, was developed in order to meet the practical demands and to solve the disadvantages mentioned. The measurement method for sampling and the criterion practical results provided evidence that, in this system, each operating process could successfully achieve a sample for a single certain spent fuel assembly with high precision. Moreover, all the operations were carried out under water, which made the radiation protection much easier.     

基于波移光纤及硅光电倍增管的钚气溶胶测量系统北大核心CSCD

钚气溶胶测量是进行钚材料相关实验研究的基础。为了确保辐射安全,常需将钚材料密封于密闭容器内以实现对钚气溶胶的包容,商用钚气溶胶监测设备由于难以放入含钚密闭容器而不适用于该应用场景下钚气溶胶浓度的监测。使用ZnS(Ag)闪烁体作为辐射灵敏材料放置于含钚密闭容器内,通过波移光纤将闪烁体信号引出密闭容器,并通过硅光电倍增管实现对闪烁体信号的采集,使用该技术路线建立的钚气溶胶测量系统能够用于密闭容器内钚气溶胶的测量。该测量系统可根据具体需求实现对探测器尺寸、形状的定制,具有功耗低,结构相对简单等优点,实现了密闭容器内钚气溶胶的远程就地测量,具备n/γ混合辐射场下α粒子甄别测量能力。