Abstract
The secondary passive residual heat removal system (PRHRS) has been adopted in third-generation nuclear power plants to improve its inherent safety. However, the extent to which the performance of the secondary PRHRS is affected under typical ocean conditions such as rolling and inclination is still unclear. To investigate the start-up characteristics of the secondary PRHRS of the offshore floating nuclear plant under rolling conditions, a secondary PRHRS test facility is designed and built. The change process of important parameters is analyzed during the system start-up process. The results show that the PRHRS can extract the heat from the steam generator successfully under rolling conditions. Moreover, the natural circulation flow rate of the secondary PRHRS fluctuates periodically. Rolling motions attenuate thermal stratification in the cooling tank and affect the evolution characteristics of the outlet temperature of the passive residual heat exchanger. The investigation is helpful for the design and engineering application of secondary PRHRS of offshore floating nuclear plants.
