[en] The aim of this study is to present the level-1 of Probabilistic Safety Assessment (PSA) analysis of the Loss of Offsite Power (LOOP) in Bushehr VVER-1000;V446 Nuclear Power Plant (NPP) using the Hands-On Integrated Reliability Evaluations (SAPHIRE) software. PSA is a very suitable method for determining scenarios of accidents and estimating the risk of a power plant. LOOP is one of the beyond design basis accidents that can lead to melting of the reactor core and dangerous environmental consequences. Therefore, the study of this accident and its consequences is very important in nuclear power plant. For this purpose, the event tree and fault tree analysis of LOOP event is considered by SAPHIRE code and compared with the Bushehr NPP Final Safety Analysis Reports (FSAR). The total frequency of LOOP event that would lead to core damage is 3.40e-6 per year.