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:
llowing: (1) transducer types and their specifications, including applicable frequency and amplitude ranges; (2) transducer positions to monitor significant lateral, vertical, and torsional structural motions of major reactor internals in shell, beam, and rigid body modes of vibration, as well as significant hydraulic responses which can be used to confirm the input forcing functions; (3) methods to ensure data quality (e.g., optimization of signal-to-noise ratio, relationship of recording times to data reduction provisions, and choice of instrumentation system); DG-1323, Page 31 (4) types and locations of transducers to provide redundancy in case some sensors fail; (5) online data evaluation system to provide immediate verification of general data quality; (6) procedures for determining frequency, modal content, and maximum values of response; and (7) all bias errors (such as model underprediction) and random uncertainties (such as instrumentation error) associated with the instrumentation and data acquisition systems. b. Guidance on power ascension plan: The power ascension plan needs to include the test operating conditions and provisions to compare measurements and any accompanying analyses with acceptance limits before ascension to higher power levels. Also, projected vibration and stress levels at higher power levels need to be estimated based on trending of lower power data, and shown to be below acceptance limits. In particular, the power ascension program needs to include the following, as applicable: (1) power levels at which data should be acquired and analyzed; (2) activities to be accomplished during data analysis; (3) plant parameters to be monitored in comparison with applicable acceptance limits; (4) inspections to be conducted for steam, feedwater, and condensate systems and components during the specified power levels; (5) methods to be used to trend plant parameters (see additional guidance below for details); (6) acceptance criteria for