Assessment and ranking of occupational health and safety risks in the machinery maintenance unit of dam construction projects using the combined approach of methods (Fmea and Fuzzy Topsis)

Abstract

A dam construction project is exposed to various risks due to the amount of investment, duration of implementation, the complexity of design and implementation, etc., and these risks will lead to human and financial losses. Thus, based on three principles, including (i) time, (ii) quality, and (iii) cost, identifying, assessing, ranking risks, and Occupational Safety and Health (OSH) can have a significant impact on project objectives. The machinery maintenance unit has the largest share of the organization's cost model. Manpower, tools, spare parts, and working standards of planning and scheduling are the most important elements of the implementation of the maintenance process in these organizations. Methodology In the present research, first, all the failure modes of the machinery maintenance unit were identified. Then, to assess and rank them, in addition to the three traditional attributes in Failure Modes and Effects Analysis (FMEA) (severity-S, occurrence-O, and detection-D) and calculate the Risk Priority Number (RPN), we used fuzzy numbers corresponding to real-world problems instead of crisp numbers for risk ranking.