Document: NUREG-0800
Document ID: 6b7eddf4-f7ce-4821-9f11-e37070221e57
Document Type: srp
Title: DYNAMIC TESTING AND ANALYSIS OF SYSTEMS, STRUCTURES, AND
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1613/ML16133A418.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.2
CFR Part: 
CFR Title: 

Content:
should be documented, particularly changes in welds, materials, wall thicknesses, and any other parameter which affects structural response significantly. Choice of testing locations need to be based on correlation to regions of predicted maximum structural vibration and stress, as well as minimized sensitivity to uncertainty in sensor orientation and location. For example, strain gages should be installed and oriented near low strain gradient locations, and accelerometers installed near maximum vibration amplitude locations. 4. For requirements of GDCs 1 and 4, the preoperational and initial startup vibration and stress test program for the reactor internals should conform to the provisions specified in RG 1.20, Revision 4. The testing needs to include vibration and strain prediction, vibration and strain monitoring, adverse flow effects (flow-induced acoustic and structural resonances), data reduction, bias errors and uncertainty analysis, and surface inspections. The vibration testing should be conducted with the fuel elements in the core or with dummy elements with equivalent dynamic effects and flow characteristics. Testing 3.9.2-26 Revision 4 – March 2017 without fuel elements in the core may be acceptable if testing in this mode is demonstrably reasonable. The planned duration of the test for the normal operation modes to ensure that all critical components are subjected to at least 106 cycles of vibration should be provided. For instance, if the lowest response frequency of the core internal structures is 10 Hz, a total test duration of 1.2 days or more is acceptable. Vibration predictions, and test acceptance criteria and their bases, should be made available before the test. The methods and procedures to process the test data for meaningful interpretation of the vibration and stress behavior of various components should be provided. Vibration interpretation should include the amplitude, frequency content, stress state, and possible effects on safety