Document: NUREG-0800
Document ID: fbcd53f5-fb4a-436f-9443-ef89f47e42cc
Document Type: srp
Title: SEISMIC AND DYNAMIC QUALIFICATION OF MECHANICAL AND ELECTRICAL
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1422/ML14227A631.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.10
CFR Part: 
CFR Title: 

Content:
0). The staff concluded in SECY 93-087, “Policy, Technical, and Licensing Issues Pertaining to Evolutionary and Advanced Light-Water Reactor (ALWR) Designs,” that the effect of eliminating the OBE from equipment qualification by analysis should be negligible. Mechanical equipment is generally seismically rugged when properly anchored, and its tolerance limits are controlled by the SSE rather than the OBE. However, some electrical equipment qualified by seismic analysis requires five OBE events followed by one SSE event. With the elimination of OBE, analysis checks for fatigue effects can be performed at a fraction of the SSE. The NRC concluded in Staff Requirement Memorandum on SECY-93-087 that electrical equipment should be qualified with five one-half SSE events followed by one full SSE event. Or alternatively, a number of fractional peak cycles equivalent to the maximum peak cycle for five one-half SSE events may be used in accordance with Appendix D to IEEE Std. 344-1987 when followed by one full SSE, even if the OBE of the plant is defined to be one-third of SSE or less. For other reactors, the staff will review the seismic qualification based on the OBE level, in accordance with the licensing basis. 4. For review of a DC application, the reviewer should follow the above procedures to verify that the design, including requirements and restrictions (e.g., interface requirements and site parameters), set forth in the FSAR meets the acceptance criteria. DCs have referred to the FSAR as the design control document (DCD). The reviewer should also consider the appropriateness of identified COL action items. The reviewer may identify additional COL action items; however, to ensure these COL action items are addressed during a COL application, they should be added to the DC FSAR. For review of a COL application, the scope of the review is dependent on whether the COL applicant references a DC, an early site permit or other NRC approvals (e.g., manufacturing