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:
y nominal differences in arrangement, design, size, and operating conditions have been quantitatively shown (by test or analysis) to have no significant effect on the vibratory response and excitation previously determined for a valid prototype. If this determination cannot be justified, the NRC staff will classify the reactor internal component as a prototype or limited prototype as described in this regulatory guide. Based on current operating experience, the applicant or licensee for a BWR nuclear power plant should provide significant justification where it proposes to classify a BWR steam dryer as a “non-prototype” reactor internal component. An acceptable program for non-prototype reactor internals is delineated below in Section C.4. The applicability or non-applicability of all potential sources of vibratory excitation that are described below in Section C.2 needs to be assessed and documented. See Section C.1.4 of this regulatory guide for special considerations for classifying reactor internals in multi-unit plants and standard reactor designs. 1.4 Special Considerations for Classifying Reactor Internals in Multi-Unit Plants and Standard Reactor Designs For a multi-unit nuclear power plant on a single site or a standard reactor design being constructed at the same time for units at multiple sites, the applicant/licensee might not have operating experience with the reactor internals for those multiple reactor units when applying for a design certification, COL, or OL; or proposing an EPU license amendment. The acceptability of classifying reactor internals as prototype, limited prototype, or non-prototype components in individual units of a multi-unit nuclear power plant or for multiple units of a standard reactor design will be assessed on a case-by-case basis depending on the breadth and quality of previously submitted information for similar SSCs. For example, the steam dryer in one BWR unit may be classified as a “prototype” and the steam dryers