Document: NUREG-0800
Document ID: 5dc31795-dfdc-4ed0-a4c2-e6a13e4997ab
Document Type: srp
Title: SEISMIC AND DYNAMIC QUALIFICATION OF MECHANICAL AND ELECTRICAL
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1608/ML16088A101.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.10
CFR Part: 
CFR Title: 

Content:
nalysis is performed to determine the vibratory input to the valve or pump. b. An analysis is performed to determine the system’s natural frequencies and the movement of the pump or valve during the dynamic events. c. An analysis is performed to determine the pressure differential and the impact energy on a valve disc during a LOCA and to verify the design adequacy of the disc. d. An analysis is performed to determine the forcing functions of the axial and radial loads imposed on a pump rotor because of a LOCA, such that combined LOCA and vibratory effects on the shaft and rotor assembly can be evaluated. e. An analysis is performed to determine the speed of the pump shaft as a result of postulated events and to compare that speed with the design critical speed. f. An analysis is performed to verify the design adequacy of the wall thickness of valve and pump pressure retaining bodies. g. An analysis is performed to determine the natural frequencies of a pump shaft and rotor assembly to ascertain whether they are within the frequency range of the vibratory excitations. If the minimum natural frequency of the assembly 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.” 3.10-10 Revision 4 – December 2016 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