Document: NUREG-0800
Document ID: b91646e8-0b07-4d85-a5e4-783b27cdcd88
Document Type: srp
Title: SEISMIC AND DYNAMIC QUALIFICATION OF MECHANICAL AND
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070286.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.10
CFR Part: 
CFR Title: 

Content:
ark II and III containments, larger frequency ranges may be required. If resonant frequencies of the equipment and equipment supports are identified by prior analysis or "sweep" testing or both, tests conducted only at the resonant frequencies are acceptable. However, if multifrequency input excitations are used, the level of response spectrum derived from the test input should envelope the corresponding response spectrum level required for seismic and dynamic qualification at the component mounting location. (3) The test motion may be applied to one vertical and two orthogonal horizontal axes separately. However, biaxial input with simultaneous vertical and horizontal excitations as delineated in IEEE Std. 344-1975 is preferable and should be utilized whenever possible. b. Design Adequacy of Supports (1) Analyses or tests should be performed for all supports of mechanical and electrical equipment to assure their structural capability. (2) The analytical results should include the maximum accelerations and associated frequencies at the equipment mounting location, and the DRAFT Rev. 3 - April 1996 3.10-10 combined stresses of the support structures should be in accordance with the criteria specified in SRP Section 3.9.3. (3) Supports should be tested with equipment installed or with a dummy simulating the equivalent inertial mass effects and dynamic coupling to the support. If the equipment is installed in a nonoperational mode for the support test, the response at the equipment mounting location should be monitored such that the maximum accelerations and associated frequencies can be defined. In such a case, equipment should be tested separately for operability and the actual input motion to the equipment should be more conservative in amplitude and frequency content than the monitored response. (4) The criteria of Subsections II.1.a.(7), (8), and (13) and II.2.a.(1), (2), and (3), above, are applicable when tests are conducted on the equipment supports.42 3. GDC 1