Document: NUREG-0800
Document ID: 7c104096-d040-463a-a94b-a0af08ab3478
Document Type: srp
Title: DYNAMIC TESTING AND ANALYSIS OF SYSTEMS, STRUCTURES, AND
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0702/ML070230008.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.2
CFR Part: 
CFR Title: 

Content:
Testing to evaluate potential adverse flow effects on reactor internal components should include the steam dryer and MSL valves. The instrumentation directly mounted on the steam dryer should include pressure sensors, strain gages, and accelerometers. The MSLs also should be instrumented to collect data to determine steam pressure fluctuations to identify the presence of flow-excited acoustic resonances and to allow the analysis of those pressure fluctuations to calculate MSL valve loading and vibration and steam dryer loading and stress. Accelerometers should be mounted on the main steam valves to record the presence and the level of any flow-excited acoustic resonance or vibration. D. 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. E. Testing should include all of the flow modes of normal operation and upset transients. The proposed set of flow modes is acceptable if it provides a conservative basis for determining the dynamic response of the tested components and is reviewed on request. The power ascension program for startup testing should include specific hold points with sufficiently long duration to allow data recording and reduction, comparisons with predetermined limit loading, and inspections and walkdowns for steam, feedwater, and condensate systems. The test program also should include details of actions to be taken if acceptance 3.9.2-21 Revision 3 - March 2007 criteria are not satisfied. Further information on test procedure is addressed in RG 1.20. F. The methods and procedures to process the test data for meaningful interpretation of the vibration behavior of various components should be provided. Vibration interpretation should include the amplitude, frequency content, stress state,