Regulatory analysis for resolution of Unresolved Safety Issue A-46, seismic qualification of equipment in operating plants
The margin of safety provided in existing nuclear power plant equipment to resist seismically induced loads and perform required safety functions may vary considerably, because of significant changes in design criteria and methods for the seismic qualification of equipment over the years. Therefore, the seismic qualification of equipment in operating plants must be reassessed to determine whether requalification is necessary. The objective of technical studies performed under Task Action Plan A-46 was to establish an explicit set of guidelines and acceptance criteria to judge the adequacy of equipment under seismic loading at all operating plants, in lieu of requiring these plants to meet the criteria that are applied to new plants. This report presents the regulatory analysis for Unresolved Safety Issue (USI) A-46. It includes: Statement of the Problem; the Objective of USI A-46; a Summary of A-46 Tasks; a Proposed Implementation Procedure; a Value-Impact Analysis; Application of the Backfit Rule; 10 CFR 50.109; Implementation; and Operating Plants To Be Reviewed to USI A-46 Requirements.
- Research Organization:
- Nuclear Regulatory Commission, Washington, DC (USA). Div. of Safety Review and Oversight
- OSTI ID:
- 6189605
- Report Number(s):
- NUREG-1211; ON: TI87900529
- Country of Publication:
- United States
- Language:
- English
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Seismic qualification of equipment in operating nuclear power plants. Unresolved safety issue A-46, draft report for comment
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