The research focus on reducing the number of occupational accidents by finding the root causes of work accidents and optimize the implementation of Health and Safety values in PT X. The possibility of risk identified using Failure Mode and Effect Analysis (FMEA) and analyze it by calculating Risk Priority Number (RPN). A list of critical risk then developed through calculation of total RPN value ratio. The cause of the accidents are analyze systematically using Fault Tree Analysis (FTA). Based on the largest RPN value on FMEA, the most dominant failure mode with the most dominant effect of the cable / source of electrical current is not in a safe condition with fire effects and operators work is not appropriate SOP with work accident effect (RPN : 172.99). FTA are designed to have 3 failures are fire failures, work accidents, and operators do not use personal protective equipment. Each FTA that has been designed contains a chart that is the cause and effect of an event.