Document: NUREG-0800
Document ID: 895a4e7d-7235-4ab1-b5dd-05a601c1c267
Document Type: srp
Title: SEISMIC AND DYNAMIC QUALIFICATION OF MECHANICAL AND
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070720037.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.10
CFR Part: 
CFR Title: 

Content:
atory 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 it 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. 3.10-8 Revision 3 - March 2007 (h) When analyses are used for qualification, the combination of multimodal and multidirectional responses should be made in accordance with RG 1.92. 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 in subsection II.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 II.1.A.iii above. In such a case, equipment should