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:
ents that have been previously tested to IEEE Std 344-1971 should be requalified using biaxial test input motions unless the applicant provides justification for using a single-axis test input motion. vii. Dynamic coupling between the equipment and related systems, if any, such as connected piping and other mechanical components, should be considered. viii. The fixture design should simulate the actual service mounting and should not cause any extraneous dynamic coupling to the test item. ix. For pumps and valves, the loads imposed by the attached piping should be considered. To ensure functionality under combined loadings, the stresses resulting from the applied test loads should envelop the specified service stress limit for the intended function of the component. Stresses in valve bodies and pump casings should be limited to the particular material’s elastic limit when the pump or valve is subject to the combination of normal operating loads, SSE, and other applicable dynamic loads. x. If the dynamic testing of a pump or valve assembly proves to be impracticable, static testing of the assembly is acceptable provided that the end loadings are conservatively applied and are equal to or greater than postulated event loads, all dynamic amplification effects are accounted for, the component is in the operating mode during and after the application of loads, and an adequate analysis is made to show the validity of the static application of loads. xi. The in situ application of vibratory devices to simulate the seismic and dynamic vibratory motions on a complex active device is acceptable to confirm the functionality of the device when the applicant shows that a meaningful test can be made in this way. xii. The test program may be based on selective testing of a representative number of components according to type, load level, size, and the like on a prototype basis. xiii. Selection of damping values for equipment to be qualified should be made in accordance with RG