In Japan, maintenance works for nuclear power plants have been achieved by skills and knowledge of experienced field workers. Retirement of aged maintenance workers and shortage of hands are expected to decrease the efficiency of maintenance works in the future. One of approaches to securing the efficiency of maintenance works is the sophistication of work procedures instruction of maintenance team leaders. With team leaders’ sophisticated work procedures instruction powered by appropriate contents, timing, and media, even novice maintenance workers who do not have sufficient experiences and skills should be able to conduct their work precisely and efficiently. In this study, the authors developed a prototype of a computer-based work procedures instruction tool for maintenance team leaders to use in Tool Box Meeting (TBM) that takes place before the starting of field work, and evaluated the acceptability of the tool with the cooperation of actual maintenance teams. Multimedia contents and the large touch display of the prototype are for maintenance team leaders to explain schedules, work procedures, and workers placement while interacting with team members. The authors got the maintenance teams to try the functions of the prototype, and conducted interviews with the team leaders and members to understand their existing work flow and define requirements for the work procedures instruction tool. The results of the evaluation shows that the use of multimedia for work procedures instruction will be effective; and that the fitness of the tool for the existing work flow will be significant. With the results, Hitachi continues the development of the work procedures instruction tool, mainly focusing on the improvement of the interfaces for explaining work procedures and preparing for TBM.