This paper presents the hazard analysis of the events which caused passengers to fall to the ground due to an unscheduled opening of a train door while the train is moving in Busan-Gimhase Light Rapid Train.

The train has the Door/Lock function and Safety Detection of the Door Close/Lock Status as safety functions to achieve safety in order to reduce the probability of that hazard. This paper discusses the assessment to achieve safety on an unscheduled opening by the inspection given in IEC 61058 of both the safety functions.

The door system was provided for BGLRT by Vapor Europe srl and the assessment based on its Technical Report\cite{vaportec} and SIL Analysis\cite{vaporsil} in IEC 61068 has been carried out. According to the assessment, it is concluded that the door system is designed to minimize the probability of an unscheduled opening of door while a train is moving and that residual risk of the system is acceptable.