The objectives of this publication are to review the safety philosophy for the primary coolant pipe (PCP) rupture event in pool type liquid metal fast reactors (LMFRs), to assess the structural reliability of the PCP and the probability of rupture under different conditions (with/without in-service inspection), to review the classification of the PCP rupture event in the design basis/beyond design basis categories and discuss the applicable design safety limits, to assess the need for consequential analysis such as pipe whip effects, primary pump seizure and multiple pipe rupture, and, last but not least, to present the results of analyses of the event per se for flows and/or temperatures and improved design concepts for minimizing the consequences to the core.