Document: NRC Regulatory Guide
Document ID: ad61f8a3-1cce-4446-9542-dcdda55c1ec6
Document Type: regulatory_guide
Title: Comprehensive Vibration Assessment Program for Reactor Internals During Preoperational and Initial Startup Testing + HISTORY - HISTORY 07/2015 – DG-1323 , Proposed Revision 4 03/2013 – Periodic Review of Revision 3 – No Issues Identified 11/2006 – DG-1163 , Proposed Revision 3 (Rev. 4)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1508/ML15083A390.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.20
CFR Part: 
CFR Title: 

Content:
FIV, AR, AIV, or MIV; and which have been shown by analysis (using acceptable methods from Section C.2.1) to have an acceptable margin of safety against such effects, no instrumentation on the SSC or associated measurements are necessary. Measurements need to be performed, however, on systems and components that have been adversely affected by FIV, AR, AIV and MIV in the past (such as BWR steam dryers as described in Section C.2.2.1 below), and on those SSCs for which the analysis has shown less margin of safety against such effects. Instrumentation will be needed for new components that have no operating experience. The measurement program is summarized below. 2.2.1 Specific Guidance for BWR Steam Dryers The plant startup testing to evaluate potential adverse flow effects on BWR plant reactor internals needs to include the steam dryer. For plant startup, plant data from instrumentation mounted directly on the steam dryer need to be collected at significant locations (including the outer hood and skirt, and other potential high-stress locations) to confirm that the alternating stress on individual steam dryer components will be within allowable limits during plant operation. The locations of sensors directly mounted on the dryer need to be based on the dryer structural modeling and vibration analysis. The sensors need to provide sufficient information to confirm the acceptability of the stress analysis of the entire steam dryer, and need to include pressure sensors, strain gauges, and accelerometers. Limits (peak or RMS levels, and/or limit curves over frequency) for the steam dryer sensors need to provide assurance that the alternating stresses in the individual steam dryer components will not exceed the ASME BPV Code fatigue limits. The acceptance limits, while including the bias errors and uncertainties from the end-to-end vibration and stress analyses, need to also include errors and uncertainties associated with the vibration and stress measurement program (in