Document: NUREG-0800
Document ID: 228b9b6e-c81e-4d76-9b8e-12f6c3bd7fa1
Document Type: srp
Title: and Regulatory Guide 1.92,(Reference 10) "Combining Modal Responses
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070336.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.2
CFR Part: 
CFR Title: 

Content:
in Regulatory Guide 1.20, including vibration prediction, vibration monitoring, data reduction, and surface inspection. The test program to demonstrate design adequacy of the reactor internals should include, but not necessarily be limited to the following: a. The vibration testing should be conducted with the fuel elements in the core or with dummy elements which provide equivalent dynamic effects and flow characteristics. Testing without fuel elements in the core may be acceptable if it can be demonstrated that testing in this mode is conservative. b. A brief description of the vibration monitoring instrumentation should be provided, including instrument types and diagrams of locations, which should include the locations having the most severe vibratory motions or having the most effect on safety functions. c. The planned duration of the test for the normal operation modes to assureensure that all critical components are subjected to at least 10 cycles of vibration should 6 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 will be acceptable. DRAFT Rev. 3 - April 1996 3.9.2-16 d. Testing should include all of the different flow modes of normal operation and upset transients. The proposed set of flow modes are acceptable if they provide a conservative basis for determining the dynamic response of the reactor internals and are reviewed by RSBSRXB on request. 44 e. The methods and procedures to be used to process the test data to obtain a meaningful interpretation of the core structure vibration behavior should be provided. Vibration interpretation should include the amplitude, frequency content, stress state, and the possible effects on safety functions. f. Vibration predictions, test acceptance criteria and bases, and permissible deviations from the criteria should be provided before the test. g. Visual and nondestructive surface inspections should be performed after the