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:
n be developed for other types of equipment. (1) Simple and passive elements, such as valve and pump bodies and their related piping and supports, may be analyzed to confirm structural integrity under postulated event loadings. However, complex active devices such as pump motors, valve operators and gate or disk assemblies, and other electrical, mechanical, pneumatic, or hydraulic appurtenances which are vital to the pump or valve operation should be tested for functionality. (2) The following analyses are acceptable provided they are correlated to classical problems, elementary laboratory tests, or in situ tests: 3.10-9 Draft Revision 4 – August 2015 a. An analysis 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