Title 10, Code of Federal Regulations, Part 50, Appendix B is the foundational quality assurance regulation for US nuclear power plants, published and enforced by the Nuclear Regulatory Commission (NRC). It defines 18 criteria that every licensed plant must satisfy, not as aspirational goals, but as legally binding requirements that the NRC evaluates during inspections and uses as the basis for enforcement actions.
The 18 criteria
Each criterion addresses a specific dimension of nuclear quality management. Together they form an integrated framework, weakness in one area creates gaps in others.
| Criterion | Title |
|---|---|
| Criterion I | Organization |
| Criterion II | Quality Assurance Program |
| Criterion III | Design Control |
| Criterion IV | Procurement Document Control |
| Criterion V | Instructions, Procedures, and Drawings |
| Criterion VI | Document Control |
| Criterion VII | Control of Purchased Material, Equipment, and Services |
| Criterion VIII | Identification and Control of Materials, Parts, and Components |
| Criterion IX | Control of Special Processes |
| Criterion X | Inspection |
| Criterion XI | Test Control |
| Criterion XII | Control of Measuring and Test Equipment |
| Criterion XIII | Handling, Storage, and Shipping |
| Criterion XIV | Inspection, Test, and Operating Status |
| Criterion XV | Nonconforming Materials, Parts, or Components |
| Criterion XVI | Corrective Action |
| Criterion XVII | Quality Assurance Records |
| Criterion XVIII | Audits |
Appendix B vs. NQA-1: what's the difference?
Appendix B and NQA-1 are frequently referenced together and their 18 sections map almost exactly to each other. The critical distinction is their legal character.
Appendix B is a regulation. It is the NRC's mandatory requirement. A plant's failure to satisfy any of its 18 criteria is a violation that can result in inspection findings, Notices of Violation, or civil penalties.
NQA-1 is a standard. It is the industry consensus document that explains how to implement a QA program that satisfies the Appendix B criteria. The NRC recognises NQA-1 as an acceptable means of compliance, but the regulation is Appendix B, NQA-1 is the implementation guide.
Practical implication: When an NRC inspector cites a program deficiency, the citation will reference an Appendix B criterion. When a plant's QA manual describes its program, it will typically reference NQA-1 requirements. The two frameworks are parallel, understanding one makes the other immediately readable.
Where enforcement findings concentrate
NRC enforcement data consistently shows that the majority of Appendix B-related findings cluster in the same four criteria. Criterion XV (Nonconforming Items) is cited when nonconformances are not identified, documented, or dispositioned in a controlled manner. Criterion XVI (Corrective Action) is cited when corrective actions remain open past resolution deadlines, when root cause analyses are inadequate, or when the same issue recurs. Criterion VII (Purchased Material and Services) is cited when supplier qualifications are current but surveillance is absent, or when unqualified suppliers deliver safety-related items. Criterion VI (Document Control) is cited when personnel are found using superseded procedures or revision-controlled documents are not properly managed.
These four criteria share a common characteristic: they require ongoing operational discipline, not just initial program establishment. A plant can have well-written procedures that satisfy Appendix B on paper, but fail the criteria in practice when the day-to-day tracking and oversight breaks down.
Applicability to suppliers
Appendix B applies directly to NRC-licensed facilities, but its requirements flow down through the supply chain via Criterion VII and Criterion IV. Licensees are required to ensure their safety-related suppliers maintain quality programs that meet Appendix B requirements, which in practice means requiring supplier compliance with NQA-1.
This means nuclear suppliers, even those that are not themselves NRC licensees, must implement NQA-1-compliant quality programs to qualify for and retain their position on a licensee's Qualified Suppliers List. The burden of compliance effectively extends to the entire nuclear supply chain for safety-related work.
Forged Operations helps nuclear programs meet Appendix B requirements in practice. The platform manages document control (Criterion VI), NCR lifecycle (Criterion XV), corrective action tracking (Criterion XVI), supplier qualification (Criterion VII), and audit readiness, in one integrated system with full traceability.
References
- U.S. Nuclear Regulatory Commission. "Quality Assurance Criteria for Nuclear Power Plants and Fuel Reprocessing Plants." Code of Federal Regulations, 10 CFR 50 Appendix B. Washington, D.C.: NRC.
- American Society of Mechanical Engineers. ASME NQA-1-2022: Quality Assurance Requirements for Nuclear Facility Applications. New York: ASME, 2022.
- U.S. Nuclear Regulatory Commission. NUREG-1600: General Statement of Policy and Procedure for NRC Enforcement Actions. Washington, D.C.: NRC.
- U.S. Nuclear Regulatory Commission. NUREG-0800: Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants, Chapter 17 — Quality Assurance. Washington, D.C.: NRC.