Latest / The Operations Podcast with Fexingo: Process, People, and Profit in Modern Business / How the US Navy Rebuilt Its Nuclear Submarine Supply Chain
Transcript
- Lucas: So, the US Navy operates about 70 nuclear submarines. Each one has a reactor that’s basically a miniature nuclear power plant, crammed into a pressure hull, and it has to run silently for decades without ever failing. That is one of the hardest operations challenges in the world. Luna: And the supply chain behind that — I mean, we’re talking thousands of suppliers, each making parts so precise that a single hair’s-width defect can scrap a multi-million dollar component. Lucas: Right. And for a long time, that supply chain was a mess. By the early 2010s, the Navy had about 17,000 suppliers feeding into its submarine programs. Shipyards were getting late deliveries, parts didn’t fit, quality was inconsistent. Luna: 17,000. That’s more suppliers than Ford has for the F-150. And the Navy doesn’t have the option of just switching suppliers. You can’t second-source a nuclear reactor valve. Lucas: Exactly. So around 2018, the Naval Sea Systems Command — NAVSEA — launched what they called the Submarine Industrial Base program. It was a massive supply chain consolidation. They tiered the supplier base. So instead of each shipyard buying directly from 17,000 vendors, they identified critical components and created a tier-one layer of about 1,500 strategic suppliers. Luna: That’s a 90 percent reduction in direct vendors. How did they pull that off without breaking production? Lucas: They did it by being very surgical. They didn’t cut suppliers randomly. They analyzed every part that goes into a Virginia-class submarine — that’s the workhorse fast-attack submarine — and flagged components that had the highest risk: long lead times, single-source dependencies, quality issues. Then they worked with the prime contractors, General Dynamics Electric Boat and Huntington Ingalls’ Newport News Shipbuilding, to consolidate those buys through preferred suppliers. Luna: So, essentially, they created a managed marketplace. And for those tier-one suppliers, they offered longer contracts and more predictable volumes, right? Lucas: Yes. And that’s the key. The Navy switched to what’s called multi-year procurement, or block buy contracts. So instead of ordering submarines one at a time, they’d commit to buying two boats per year for five years. That gave suppliers a guaranteed demand signal, which allowed them to invest in capacity and quality. Luna: And the results? I read that Virginia-class boats are now being delivered 18 months ahead of schedule. Is that right? Lucas: It is. As of late 2025, the program has seen lead times on critical components drop by about 40 percent. The average defect rate across the supply base fell by 60 percent. And that’s not just anecdotal — the Navy tracks this through something called the Supplier Performance Incentive Program. Luna: Tell me more about that program. It sounds like a bonus system? Lucas: It is. The Navy grades suppliers on a scorecard: on-time delivery, quality, cost performance. If you hit certain thresholds, you get a percentage bonus on your contract. If you consistently underperform, you lose eligibility for future work. It’s not a gentle approach. Luna: So it’s carrot and stick, but the Navy is the only customer. That’s a very different dynamic from, say, a consumer electronics company that can play suppliers against each other. Lucas: Absolutely. And that single-customer dependency creates its own risks. If the Navy’s budgets get cut — which happened in the sequester years — those tier-one suppliers are left holding idle capacity. So the Navy tries to smooth demand through the block buy model, but it’s not perfectly predictable. Luna: Right. And we’re talking about parts that take years to manufacture. A nuclear reactor vessel has a lead time of about three years. You can’t just ramp up production quickly. Lucas: So the Navy’s operations team had to forecast demand out ten years. They built a model that maps every component to its lead time and its supplier, and they run simulations to see where bottlenecks will emerge. It’s like a very high-stakes version of what Toyota does with its supply chain. Luna: Except Toyota has multiple suppliers for most parts. The Navy often has one or two. That’s a level of operational risk most companies would never accept. Lucas: And yet, the Navy has managed to improve performance. One example: the propulsion shaft for the Virginia class used to be forged by a single company in Pennsylvania. That company had a fire in 2020, and production shut down for six months. The Navy had to qualify a second forging supplier in Ohio, which took 18 months. That’s the fragility of a single-source supply chain. Luna: So they’re now actively dual-sourcing for the most critical components. I think they’ve done that for reactor coolant pumps and valves as well. Lucas: Yes. And they’ve also invested in supplier development. The Navy has a team of about 50 operations experts who go into supplier factories and help them improve processes — lean manufacturing, quality control, even workforce training. It’s like a free consulting service, funded by the taxpayer. Luna: That’s fascinating. So they don’t just demand improvement; they actively enable it. How do those interventions impact cost? Lucas: The Navy says that for every dollar spent on supplier development, they save about four dollars in reduced rework and schedule delays. One of the big wins was with a company that makes electrical connectors for the submarine’s control systems. They had a 15 percent defect rate. After the Navy’s team worked with them on statistical process control, the defect rate dropped to under 1 percent. Luna: And that’s a part where failure isn’t an option. A bad connector could cause a short circuit in a system that controls the reactor. Lucas: Right. So the quality imperative is absolute. Which brings us to a broader lesson for commercial operations. If your product can kill people if it fails, you build a supply chain differently than if you’re making a toaster. Luna: But I think there are lessons for every business. The tiered supplier model, the long-term contracts, the performance scorecards — these are tools that any company could adapt. Most companies just don’t have the stomach for the up-front investment. Lucas: That’s the tension. The Navy can invest because it has a congressional mandate and a 30-year shipbuilding plan. A startup or a mid-size manufacturer doesn’t have that luxury. But the principles still apply: know your critical components, reduce supplier count where it makes sense, and invest in supplier capability rather than just squeezing margins. Luna: And if those conversations have moved your work forward in some small way, listeners can support the show at buy me a coffee dot com slash fexingo. It keeps us ad-free and independent. Lucas: Yeah, we really appreciate that. And it helps us keep digging into stories like this one. Luna: So, back to the Navy — what’s next? They’re building the next-generation Columbia-class ballistic missile submarine, which is even more complex. Is the supply chain ready? Lucas: That’s the big question. The Columbia class has a new reactor design, new propulsion, new sensors. The Navy is trying to apply all the lessons from the Virginia-class overhaul, but the scale is bigger. Twelve boats, each costing about $8 billion. The supply chain has to ramp up from producing two Virginia-class boats per year to eventually producing one Columbia and one Virginia per year. That’s a 50 percent increase in output with essentially the same supplier base. Luna: And some of those suppliers are already at capacity. So the Navy is now investing in new facilities — a new forging plant in Pennsylvania, a new valve factory in Wisconsin. It’s like building a supply chain from scratch in some areas. Lucas: And that’s the real operations challenge. It’s not just managing existing suppliers; it’s creating new ones. The Navy is even funding apprenticeships at supplier plants because there aren’t enough skilled welders and machinists. Luna: So it’s a workforce development problem as much as a supply chain problem. For any operations manager listening, that’s a reminder: your supply chain is only as good as the people making the parts. Lucas: Exactly. And the Navy’s experience shows that you can’t just throw money at it. You need a systematic approach — mapping dependencies, investing in relationships, and building long-term trust. Even for nuclear submarines, operations is ultimately about people.