Document: NUREG-0800
Document ID: c3ba2b86-3805-4144-9775-cd35b7bffe2d
Document Type: srp
Title: SYSTEM QUALITY GROUP CLASSIFICATION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1608/ML16084A884.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.2.2
CFR Part: 
CFR Title: 

Content:
e quality group classification, ASME BPV Code and code class, and quality assurance criteria of selected individual major component are checked for compliance with the above criteria. Safety functions for each component are not specifically identified in the FSAR classification table. The staff may question the basis for a particular component classification and/or confirm the classification basis during an audit or via an ITAAC to validate that the applicant has an appropriate classification process. The various modes of system operation are to be considered to ensure that the assigned NRC quality groups are acceptable. Completeness of a QA list is beyond scope of RG 1.26 and this SRP. 3. Quality groups and their respective ASME BPV Code class for fluid systems and major pressure-retaining components are to be included in a table. The system description and schematics or P&IDs, if applicable, typically duplicate the quality group or corresponding code class information presented in the table. Where the table does not clearly describe boundaries, the system description and schematics or P&IDs, if applicable, may be reviewed to ensure that the applicant has delineated in detail the system quality group classification boundaries for systems important to safety. ASME BPV Code class and/or quality group is generally shown in Tier 2. If during the review of Tier 1 information according to SRP Section 14.3, discrepancies are identified between Tier 1 and Tier 2 system description and schematics or P&IDs concerning quality group or ASME BPV Code class, the applicant should be requested to verify consistency between the Tier 1 and Tier 2 information. 4. “Class breaks”—that is, the boundary between classifications such as Quality Group B and Quality Group C within a system—should be located downstream of a valve that is either normally closed or capable of automatic closure when the safety function is required. This valve should be assigned the higher classification.