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:
program, and CVAP report need to be made available to the NRC in a timely manner for staff review and resolution of comments. d. The preliminary and final reports, which together summarize the results of the vibration analysis, measurement, and inspection programs, should be submitted to the NRC within 60 and 180 days, respectively, following the completion of vibration testing or earlier if the analysis reveals operational issues. As applicable, a full steam dryer stress analysis report and evaluation should be submitted to the NRC within 90 days of first reaching 100 percent thermal power. 3. CVAP FOR LIMITED PROTOTYPE REACTOR INTERNALS If the operating conditions for the limited and the applicable valid prototype reactor internals are the same, the CVAP for limited prototype reactor internals important to safety needs to be performed at all significant flow, temperature, and pressure conditions associated with normal steady-state and anticipated transient operation under the same test conditions imposed on the valid prototype. However, if there are differences in the operating conditions, the effect of these differences from the operating conditions of the valid prototype on the structural integrity of the limited prototype reactor internals needs to be evaluated based on the results of a CVAP. Because of similarities to a valid prototype, the assessment of a limited prototype might not involve a vibration measurement program as comprehensive as the measurement program applicable to a prototype. One example is the possible use of only MSL pressure measurements in BWR plants to infer the fluctuating loading, and subsequently the alternating stress state for a steam dryer that is similar in design and operation to a valid prototype, which has previously been benchmarked using comprehensive on-dryer vibration and strain measurements. The applicant or licensee may justify a limited prototype assessment through use of a limited subset of on-dryer measurements during