反应堆中子通量测量用裂变电离室探测装置研制

Development of fission ionization chamber detector for reactor neutron flux measurement

为建立一套用于反应堆中子通量测量的监测装置,以实现核电站堆外核测量系统测量要求,研制了一种长灵敏区、宽量程、高灵敏度和强γ抑制能力的裂变电离室探测装置。同时对该裂变电离室探测装置的热中子灵敏度、高压坪特性、甄别特性和γ感应度等典型核性能指标进行了试验验证。试验结果表明,该裂变电离室综合性能能够满足AP1000系列核电站堆外核测量系统中间量程测量通道的应用需求。

In order to establish a monitoring device for reactor neutron flux measurement to meet the measurement requirements of ex-core nuclear measurement system,a fission ionization chamber detector with long sensitive region,wide range,high sensitivity and strongγ-suppression ability has been developed.At the same time,the thermal neutron sensitivity,high voltage plateau characteristic,screening threshold plateau characteristic andγsensitivity of the fission ionization chamber detector are tested and verified.The test results show that the comprehensive performance of the fission ionization chamber can meet the application requirements of the intermediate range measurement channel for ex-core nuclear measurement system of the AP1000 series nuclear power plant.