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:
date steady-state and transient vibratory loads throughout the service life of the reactor. The overall program includes predictive analysis, a measurement program, and an inspection program. The term “comprehensive” appears in the title of the overall program to emphasize that these individual elements are used together to verify structural integrity of the reactor internals (including BWR steam dryers): • The predictive analysis provides theoretical verification of structural integrity and the basis for the choice of components and specific locations to be monitored in the measurement and inspection programs. • The measurement program confirms the results of the predictive analyses. However, the measurements (i.e., data acquisition, reduction, and interpretation processes) need to be sufficiently flexible and sensitive to permit identification and definition of any significant vibratory modes that are present but were not evaluated in the predictive program. • The inspection program addresses both quantitative and qualitative verification of the predictive analysis and measurement program results. 1. CLASSIFICATION OF REACTOR INTERNALS For the purpose of specifying an acceptable CVAP, the applicant should classify its reactor internal configurations (including the steam dryer in BWR nuclear power plants) as “prototype” “limited prototype,” or “non-prototype.” 1.1 Prototype A “prototype” is a configuration of reactor internals that, because of its arrangement, design, size, or operating conditions, represents a first-of-a-kind or unique design for which no previous “valid prototype” can be referenced. DG-1323, Page 9 After the NRC staff accepts the prototype design and the CVAP is completed with no adverse inservice vibration phenomena experienced during an adequate period of operation, it may be proposed as a “valid prototype.” A valid prototype may be referenced in subsequent applications, as appropriate, subject to the