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Along with the advance era and technology, tunnel construction is the alternative infrastructure that can be used as an option, especially in difficult terrain conditions. A tunnel construction project is inseparable from a series of tasks in the form of activities. Work activities can experience disruptions caused by various things, one of the causes is the occurrence of work accidents. The risk of workplace accidents can be prevented with early identification and analysis of the potential danger that exist in every activity contained in the project-s Work Breakdown Structure (WBS). Thus, the need for a standardized WBS is very important in presenting the assessment of risk, impact and frequency arising from workplace accidents. The aim of this study is to develop a standardized WBS for risk-based safety planning on tunnel construction works. The standardized WBS will be a main input for identify potential hazard risks and producing risk-based safety plan. The results of this study are standarized WBS, potential hazard risks and the developed of WBS standard for safety planning, as an effort in preventing, reducing or eliminating the accident in tunnel construction work.