Presents the steady - state programming with constant coolant average temperature and constant live steam pressure , an ideal programming for marine nuclear power plant ( npp ) , under which , both the coolant average temperature and the live steam pressure of nuclear steam supply system ( nsss ) are constant when the steady state operating condition is varied , and points out that in comparison with the steadysate programming with constant coolant average temperature , the ideal programming can improve the overall operating performance of npp effectively , especially in low - load range , for instance , raise the heat efficiency of npp , decrease the operating noise of main coolant pump , and improve the conditions of design , operation and control of the secondary loop system 双恒定运行方案是船用压水堆核动力装置的理想运行方案.在这种运行方案下，当装置稳态功率变化时，冷却剂平均温度与蒸汽压都保持不变，与通常采用的冷却剂平均温度恒定运行方案相比，有效地改善了核动力装置的总体运行性能，特别是在低负荷运行时，可以提高装置经济性、降低主泵运行噪声、改善二回路系统的设计、运行和控制条件，这对于提高船用核动力装置的运行可靠性和安全性具有实际意义
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