A process for risk-focused maintenance

Technical Report · Fri Mar 01 00:00:00 EST 1991

DOI:https://doi.org/10.2172/5974178· OSTI ID:5974178

Lofgren, E V; Cooper, S E; Kurth, R E; Phillips, L B ^[1]

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1. Science Applications International Corp., McLean, VA (USA)

This report presents a process for focusing maintenance resources on components that enable nuclear plant systems to perform their essential functions and on components whose failure may initiate challenges to safety systems, so as to have the greatest impact in decreasing risk. The process provides criteria, based on risk, for deciding which components are critical to risk and determining what maintenance activities are required to ensure reliable operation of those risk-critical components. Two approaches are provided for selection of risk-critical components. One approach uses the results of a Probabilistic Risk Assessment (PRA); the other is based on the methodology developed for this report, which has a basis in PRA although it does not use the results of a PRA study. Following identification of risk-critical components, both approaches use a single methodology for determining what maintenance activities are required to ensure reliable operation of the identified components. The report also provides demonstrations of application of the two approaches to selection of risk-critical components and demonstrations of application of the methodology for determining what maintenance activities are required to an active standby safety system, a normally operating system, and passive components. 5 refs., 11 figs., 1 tab.

• Research Organization: Nuclear Regulatory Commission, Washington, DC (USA). Div. of Regulatory Applications; Science Applications International Corp., McLean, VA (USA)
• Sponsoring Organization: USNRC; Nuclear Regulatory Commission, Washington, DC (USA)
• OSTI ID: 5974178
• Report Number(s): NUREG/CR-5695; ON: TI91010631
• Country of Publication: United States
• Language: English

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