核电站反应堆堆芯温度测量K型热电偶的国产化研制

Abstract: 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.