Document: NUREG-0800
Document ID: 2ab6f47e-1578-451d-b6ad-29434e31a72b
Document Type: srp
Title: SYSTEM QUALITY GROUP CLASSIFICATION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340619.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.2.2
CFR Part: 
CFR Title: 

Content:
r, we have recently identified a number of potential problems which are applicable to main steam lines of BWR plants. These problems relate to postu- lated breaks in high-energy fluid-containing lines outside the containment. The criteria pertaining to protection required for structures, systems, and components outside containment from the effects of postulated pipe breaks, as contained in the Director of Licensing's letter to utilities dated July 12, 1973, reference ASME Section III, Class 2, which corresponds to NRC Quality Group B. The recent ASME Code Section XI revision contains in-service inspection requirements for Class 2 components. Steam lines classified as "D + QA" could be interpreted to be exempt from these inspection requirements. Such interpretations would be contrary to the intent of the code and inconsistent with requirements of the NRC Codes and Standards rule, Section 50.55a of 10 CFR Part 50. Furthermore, the applicability of the following NRC Regulatory Guides, Standard Review Plan section, and Regulations, as they relate to ASME Section III, Class 2 components is not always clearly identified or implemented in case applications wherever "D + QA" classification is adopted: 1. SRP Section 3.9.3, "ASME Code Class 1, 2, and 3 Components, Component Supports, and Core Support Structures." I 2. Regulatory Guide 1.26, "Quality Group Classifications and Standards." 3. 10 CFR Part 50, § 50.55a, "Codes and Standards for Nuclear Power Plants." 4. 10 CFR Part 50, Appendix B, "Quality Assurance Criteria for Nuclear Power Plants." In view of the foregoing, we find it necessary to clarify the quality group classification criteria for main steam components for BWR plants. B. BRANCH TECHNICAL POSITION The main steam line components of BWR plants should conform to the criteria listed in the attached Table A-1 of SRP Section 3.2.2. Formally BTP RSB No. 3-1 3.2.2-10 Rev. 1 - July 1981 C. REFERENCES 1. Letter of March 22, 1973,.J. A. Hinds to J. M. Hendrie. 2.