The Emerging Supply Chain for Small Modular Reactors
The global push toward small modular reactors has created a distinct supply chain ecosystem that overlaps with—but diverges significantly from—traditional large nuclear plant procurement. While established nuclear component manufacturers like Framatome and Doosan Enerbility bring decades of ASME Section III fabrication experience, the SMR sector also demands new capabilities around factory fabrication, modular assembly, and transport-ready sizing that traditional suppliers must adapt to meet.
Critical Component Categories
SMR component procurement typically spans several major categories:
- Reactor Pressure Vessels
- Smaller than conventional RPVs but requiring identical nuclear-grade quality. Key suppliers include BWXT, Framatome (Saint-Marcel facility), Doosan Enerbility (Changwon), and Japan Steel Works (Muroran). Holtec manufactures its own RPVs in-house at Camden, NJ.
- Steam Generators
- BWXT has manufactured over 315 steam generators for nuclear applications. For the Rolls-Royce SMR program alone, BWXT holds the detailed design contract for steam generators. Doosan Enerbility has delivered 124 steam generators globally.
- Instrumentation & Control Systems
- Curtiss-Wright and Westinghouse are major I&C suppliers, with Paragon Energy Solutions providing safety-related components and NRC-approved digital protection systems (HIPS) to multiple SMR programs.
- Nuclear-Grade Forgings
- Japan Steel Works commands roughly 80% of the global market for large nuclear forgings. Doosan Enerbility has begun forging production for NuScale’s first VOYGR-6 module and has reserved capacity for 16 X-energy Xe-100 units.
Supply Chain Qualification Landscape
The ASME N-Stamp certification remains the cornerstone of nuclear component supply chain qualification. A Sandia National Laboratories study tracking certifications from 1989 to 2020 found that while the U.S. held the largest number of N-stamp certificates, participation has broadened globally—China now ranks second. The total number of U.S. N-stamp holders, which declined from approximately 500 in the 1980s to around 100 by the late 2000s, is now trending upward as nuclear interest resurges.
Manufacturing Capacity Investments
Several major suppliers are scaling up specifically for SMR demand:
| Company | Investment | Facility |
|---|---|---|
| BWXT Canada | C$80M expansion | Cambridge, Ontario |
| Doosan Enerbility | New SMR fabrication plant | Changwon, South Korea |
| Holtec International | $260M technology center | Camden, NJ |
Doosan’s new Changwon facility targets capacity for approximately 20 Xe-100 reactor units annually. BWXT’s Cambridge plant is already one of the largest nuclear commercial manufacturing sites in North America and is expanding to support global SMR deployment.