Document: NRC Regulatory Guide
Document ID: 4a45938b-46f4-4b26-9191-2914fcf357f1
Document Type: regulatory_guide
Title: Inservice Inspection of Pressurized Water Reactor Steam Generator Tubes (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0037/ML003740256.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.83
CFR Part: 
CFR Title: 

Content:
otating schedule encompassing 3% of the total tubes of the steam generators in the plant if the 4SNT-TC-IA and Supplements, "Recommended Practice for Nondestructive Testing Personnel Qualification and Certifica tion." Copies may be obtained from the American Society for Nondestructive Testing, 914 Chicago Avenue, Evanston, Illinois 60202.. 1.93-3 I results of the first inspection indicate that all steam generators are performing in a like manner. (Note: Under some circumstances, the operating conditions in one or more specific steam generators may be found to be more severe than those in the other generators. Under such circumstances, the sample sequence should be modified to inspect the steam generator with the most severe conditions.) e. Every inspection subsequent to the preservice inspection should include all nonplugged tubes that previously had detectable wall penetrations (Ž20%) and should also include tubes in those areas where experi ence has indicated potential problems. 5. Supplementary Sampling Requirements a. If the eddy current inspection pursuant to regulatory position C.4.d indicates any tubes with previously undetected imperfections of 20% or greater depth, additional steam generators, if any, should be inspected. If previously degraded tubes exhibit signifi cant (10%) further wall penetration, additional steam generators should be inspected. b. If the eddy current inspection pursuant to regulatory position C.4.c indicates that more than 10%$ of the inspected tubes have detectable wall penetration (>20%) or that one or more of the inspected tubes have an indication in excess of the plugging limit (see regulatory position C.7a), an additional 3% of the tubes should be inspected, concentrating on tubes in those areas of the tube sheet array where tubes with imperfec tions were found. In addition, the rest of the steam generators should'be inspected according to regulatory position C.4.c. c. If this additional inspection indicates that more than 10%