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:
sembly is beyond the excitation frequencies, a static deflection analysis of the shaft is acceptable to account for dynamic effects. If the assembly’s natural frequencies are close to the excitation frequencies, an acceptable dynamic analysis must be performed to determine the structural response of the assembly to the excitation frequencies. h. When analyses are used for qualification, the combination of multimodal and multidirectional responses should be made in accordance with RG 1.92, “Combining Modal Responses and Spatial Components in Seismic Response Analysis.” B. Design Adequacy of Supports i. Analyses or tests should be performed for all supports of mechanical and electrical equipment to ensure their structural capability. ii. The analytical results should include the required input motions to the mounted equipment as obtained and characterized in the manner stated 3.10-10 Draft Revision 4 – August 2015 in Subsection I.1.A.iii above, and the combined stresses of the support structures should be in accordance with the criteria specified in SRP Section 3.9.3. iii. Supports should be tested with equipment installed or with a dummy simulating the equivalent equipment inertial mass effects and dynamic coupling to the support. If the equipment is installed in a nonoperational mode for the support test, the response in the test at the equipment mounting location should be monitored and characterized in the manner stated in Subsection I.1.A.iii above. In such a case, equipment should be tested separately for functionality, and the actual input motion to the equipment in this test should be higher in amplitude and frequency content than the monitored response from the support test. iv. The criteria of Subsections II.1.A.iii thru II.1.A.xiii above apply when tests are conducted on the equipment supports. C. Verification of Seismic and Dynamic Qualification. The seismic and dynamic qualification testing performed in accordance with IEEE Std. 344-2004, as