低温核供热反应堆采用一体化布置。主热交换器、控制棒驱动机构和乏燃料与堆芯一起置于反应堆压力壳内。主冷却剂靠自然循环流经堆芯和主热交换器。压力壳的冷却剂穿管都是小口径的。反应堆压力壳构成了主冷却剂压力边界的主体。这样,反应堆就可以采用紧贴式的小体积金属安全壳。该安全壳的设计原则和功能与压水堆的安全壳相同,但由于它的体积很小,可以带来一些有利之处,如制造周期短、造价低、容易实现密封等,并且在安全壳内出现主冷却剂压力边界破口时,不会导致反应堆失冷事故。 Low-temperature nuclear heating reactor with integrated layout. The main heat exchanger, control rod drive and spent fuel are placed in the reactor pressure vessel along with the core. The main coolant flows through the core and the main heat exchanger by natural circulation. The pressure hoses’ coolant tubes are all small-bore. The reactor pressure shell constitutes the main coolant pressure boundary. In this way, the reactor can use close-packed small-volume metal containment. The design principles and functions of the containment are the same as those of the PWR containment vessel. However, due to its small size, the containment vessel can bring advantages such as short production cycle, low cost, easy sealing, and the like, Within the primary coolant pressure boundary break occurs, it will not cause the reactor to lose its cold.