Performance analysis of PRHRS in primary and secondary circuit for offshore floating nuclear plant.

• A system analysis code applicable to offshore floating nuclear plant was developed based on existing code by adding motion condition model. • The station blackout accident was calculated under stationary and motion conditions with PRHRS in primary and secondary circuit operating respectively to compare the performance of the two PRHRS. • The heat removal capability of PRHRS in secondary circuit is better than that in primary circuit with the same arrangement. • Secondary PRHR is more susceptible to motion conditions than primary PRHRS. In order to conduct performance analysis of passive residual heat removal system (PRHRS), a system analysis code applicable to offshore floating nuclear plant (OFNP) was developed based on existing code by adding motion condition model and the OFNP system with PRHRS in primary and secondary circuit was modeled in this study. The station blackout (SBO) accident was calculated under stationary and motion conditions with PRHRS in primary and secondary circuit operating respectively to compare the performance of the two PRHRS. The results show that the heat removal capability of PRHRS in secondary circuit is better than that in primary circuit with the same arrangement. The influence of heaving condition on the primary PRHRS is greater than the secondary PRHRS, while the secondary PRHRS is more susceptible to trimming and pitching conditions and heeling and rolling conditions have little influence on both of two PRHRS. [ABSTRACT FROM AUTHOR]