[en] Upon shutdown of a Large Breeder Reactor, decay and latent heat must be removed to keep core temperatures below specified design limits. Usually this function will be performed using the plant's main condenser as the heat sink. If it is not available, however, heat can be removed by an auxiliary Shutdown Heat Removal System (SHRS). In support of the DOE/RRT Safe Shutdown Reliability Program, quantitative reliability studies were performed to investigate the relationships among various auxiliary SHRS configurations and the main condenser. The results of these studies show that the relative reliabilities achieved are a strong function of the auxiliary configurations selected; also that credit for the main condenser has significant reliability benefits in certain cases