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Section 4.6.3, Maintenance program

Maintenance activities include monitoring, inspecting, testing, assessing, calibrating, servicing, overhauling, repairing and replacing parts.

The maintenance program shall meet the requirements of REGDOC‑2.6.2, Maintenance Programs for Nuclear Power Plants [31].

The application should include a clearly defined maintenance program containing the proposed measures, policies, methods and procedures that provide direction for maintaining SSCs so that they remain capable of maintaining their functions, as described in design documents and safety analyses that are included in the reactor facility licensing basis.

The application should describe the processes for planning, monitoring, scheduling and executing work activities so that SSCs continue to perform the design intent and remain fit for service in the presence of degradation mechanisms.

The application should describe:

·       preventive maintenance activities

·       maintenance processes and record retention requirements

·       corrective maintenance

·       calibration of measuring and monitoring devices

·       SSC monitoring, activity optimization

·       outage management, work assessment

·       work planning and scheduling

·       work execution

·       maintenance procedures

·       post-maintenance verification and testing

·       maintenance program assessment

Tasks relating to maintenance, surveillance, inspection and testing take place primarily during the operating phase of the reactor facility’s lifecycle. However, for the construction phase, the application should describe what will be done during construction and commissioning to ensure that those tasks can be carried out effectively when the reactor facility is in the operating phase.

The description of the surveillance program should adequately cover all aspects of the operational limits and conditions (OLCs). The frequency of surveillance should be based on a reliability analysis, a probabilistic safety assessment, and previous operational experience (OPEX). This description should show the viability of inspection techniques to meet performance requirements, taking ALARA into account.

The application should describe the approach to be taken for developing acceptance criteria in the SSC inspection program. The application should consider defects such as crack-like flaws and metal loss. When establishing the acceptance criteria, the application should consider the worst combination of design loading conditions and the potential for propagation of a flaw if subjected to system transients or adverse environmental conditions.

The application should describe the program planned to cover the testing for all SSC that can affect the safety functions of the reactor facility, to confirm the continuing performance effectiveness for each SSC. The program should emphasize inspection of the primary and secondary coolant systems, given their integrity to reactor facility safety, and the severity of the possible consequences of their failure.

The information about the surveillance program, the inspection program and the testing program should include a timeline for each of these activities, with milestones for the development and implementation of each program and the processes to be followed. It should include a description of the program to ensure that each activity is carried out within the planned timelines, and that the results obtained in each activity are reviewed against the applicable acceptance criteria. Each program should include periodic reviews to ensure that it continues to meet its objectives.

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