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:
must be tested against adverse flow effects (flow-induced vibration and acoustic resonance). The tests should consider such various flow excitation mechanisms as vortex-induced vibration, flow-excited acoustic resonance, fluid-elastic instability, turbulence buffeting as well as other flow excitations from flow separation, reattachment, and impinging flow instabilities. These mechanisms are often nonlinear and their adverse effects cannot be predicted by linear extrapolation of existing plant data. The purpose of this test is to demonstrate that adverse flow effects (caused by such mechanisms) similar to those expected during operation will not cause unanticipated flow-induced vibrations of significant magnitude or structural damage. The test program description should include a list of flow modes, a list of sensor types and locations, a description of test procedures and methods to be used to process and interpret the measured data including bias errors and uncertainties, a description of the visual inspections to be made, and a comparison of the test results with the analytical predictions. 3.9.2-7 Revision 3 - March 2007 5. Dynamic system analyses should confirm the structural design adequacy and ability, with no loss of function, of the reactor internals and unbroken loops of the reactor coolant piping to withstand the loads from a loss-of-coolant accident (LOCA) in combination with the safe-shutdown earthquake (SSE). The staff review covers the methods of analysis, the considerations in defining the mathematical models, the descriptions of the forcing functions, the calculational scheme, the acceptance criteria, and the interpretation of analytical results. 6. The methods should be described by an explanation of how they will be used to correlate results from the reactor internals vibration and stress tests with the analytical results from dynamic analyses of the reactor internals under steady-state and operational flow transient conditions and in particular