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:
in the vertical and horizontal directions must be such that a purely rectilinear resultant input is avoided. An acceptable alternative is to test with vertical and horizontal inputs in phase, and then repeat the test with inputs 180 degrees out of phase. In addition, the test must be repeated with the equipment rotated 90 degrees horizontally if this alternative is selected. Components 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. 3.10-8 Revision 4 – December 2016 vii. Dynamic coupling between the equipment and related systems, if any, such as connected piping and other mechanical components, should be considered. viii. The test 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