核电站反应堆堆芯温度测量K型热电偶的国产化研制

Localization of Type K Thermocouples of In-core Temperature Measurement for Nuclear Power Plant Reactor

用于测量核电站反应堆堆芯出口温度的K型热电偶是重要的1E级设备,但该设备一直依赖进口;巴基斯坦恰希玛核电站3、4号机组为我国向巴基斯坦出口的第三、四座核电站,考虑到重要设备国产化对我国核电走出去的积极意义,这两座核电站所用堆芯温度测量K型热电偶由国内相关单位进行研制。通过对运行环境和安装要求的详细研究,在K型热电偶结构上采用了全铠装、分段式及新型热电偶接插件进行连接的创新设计,充分考虑了各部件材料选择对于K型热电偶性能及安全的影响,对传统铠装热电偶的制作工艺进行了优化与改进,最终研制的样件通过了性能试验及1E级鉴定试验,实际产品也顺利安装于巴基斯坦恰希玛核电站3、4号机组,核电站堆芯温度测量K型热电偶的研制取得了阶段性的成功。

Type K thermocouples applied in the In-core exit temperature measurement for nuclear power plants are important class 1E equipment,which have always been dependent on imports in China. With the consideration of meanings of important equipment＇s localization for＂Chinese nuclear go global＂strategy,in-core temperature measurement type K thermocouples were researched and developed by related Chinese stakeholders,and were applied in CHASHMA Nuclear Power Plants Unit 3/4,which are the third and fourth nuclear power plants built by China in Pakistan. Based on a thorough study over operation environment and installation requirements,an innovative design were applied on the thermocouple structure,which were all-sheathed,segmented and with new type thermocouple connectors,the influence of material choose on the characteristics of thermocouples and nuclear safety were carefully analyzed,the traditional thermocouples fabrication procedures were optimized and improved,eventually the samples passed the type test and 1E qualification test,and the products were successfully installed and commissioned in CHASHMA Nuclear Power Plants Unit 3/4,therefore the localization of type K thermocouples of in-core temperature measurement for nuclear power plant reactor reached a periodical success.