Document: NUREG-0800
Document ID: 6237521d-c825-4ed6-8fb7-7b3b8019a3fc
Document Type: srp
Title: SYSTEM QUALITY GROUP CLASSIFICATION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070297.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.2.2
CFR Part: 
CFR Title: 

Content:
ory Guides should receive approval from the Commission prior to their use and should demonstrate that an acceptable level of quality and safety would be achieved. Formalerly BTP RSB No. 3-1 * 3.2.2-13 DRAFT Rev. 2 - April 1996 APPENDIX A*105 CLASSIFICATION OF MAIN STEAM COMPONENTS OTHER THAN THE REACTOR COOLANT PRESSURE BOUNDARY FOR BWR PLANTS A. BACKGROUND A pipe classification of "D + QA" for main steam line components of BWR plants was proposed by the General Electric Company in 1971 as an alternative to Quality Group B and has been accepted by the staff in a number of licensing case reviews. However, we have recently identified a number of potential problems which are applicable to main steam lines of BWR plants have been identified. These problems relate to postulated 106 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,described in Appendix C to Branch Technical Position SPLB 3-1 (attached to SRP Section 3.6.1), reference ASME Section III, Class 2, which corresponds to NRC Quality 107 Group B. The recent ASME Code Section XI revision contains in-service inspection requirements for 108 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