NuScale signs Doosan contract for First Article reactor coolant work

The contract covers continued fabrication of critical upper reactor coolant system components at Doosan's production facility in Changwon, NuScale said. It builds on a partnership that began in 2019, during which the companies developed manufacturing processes, supply chain and production infrastructure for NuScale's NRC-approved technology. The agreement was signed at a ceremony at Doosan's headquarters.

"This agreement is a meaningful step in converting our approved design into deliverable modules," said John Hopkins, NuScale's president and chief executive. He said Doosan's nuclear manufacturing facility and the work since 2019 give NuScale the capacity and process maturity to deliver modules on customer schedules. Jongdoo Kim, chief executive of Doosan's nuclear business group, said the contract marks a move "from technical validation into actual manufacturing."

Design approval and module output

NuScale says its design is the only small modular reactor design certified by the U.S. Nuclear Regulatory Commission. The NRC approval covers the reactor design. Factory-built components can be transported to construction sites, the company says. Each module can generate 77 megawatts of electricity, or 250 megawatts thermal gross, and NuScale can configure plants with up to 12 modules for 924 MWe.

On 1 September 2026, NuScale and MillenniTEK said they had fabricated first-of-a-kind boron-oxide pellets for the passive emergency core cooling system. The pellets are designed to dissolve into the reactor coolant and help control core reactivity at safe levels without operator intervention, according to NuScale.

The order book is still not binding

The contract covers one component, the upper reactor coolant system. NuScale has no binding order for complete modules under the TVA program. The largest announced U.S. program tied to NuScale is TVA's plan to add up to 6 gigawatts of nuclear capacity, or about 72 of its 77-megawatt modules. The September 2025 agreement behind that plan was signed by TVA and ENTRA1 Energy, NuScale's exclusive commercialization partner, and NuScale was not a party to it. The agreement is non-binding.

Under the announced structure, ENTRA1 would develop, finance, own and manage the plants and sell electricity to TVA under future power purchase agreements. NuScale would supply the reactor technology. TVA and ENTRA1 say the program could power about 4.5 million homes or 60 new data centers. NuScale and ENTRA1 also hold a 50/50 joint venture called ENTRA1 NuScale.

Money currently moves from NuScale to ENTRA1 as the program hits milestones. Under a partnership milestones agreement signed in August 2025, NuScale recorded a $507.4 million expense for the first milestone, which its filings describe as 15% of the total. It paid $247.5 million of that in 2025 and $259.9 million in the first half of 2026. Operating cash outflow reached $372.9 million in the first half of 2026, against $56.1 million a year earlier. Revenue in the second quarter of 2026 was $75,000, down from $8.1 million a year earlier.

What happens next

NuScale said ENTRA1 "continues to advance discussions" with TVA toward a definitive power purchase agreement. Until one is signed, nothing is contracted. The Doosan contract moves the upper reactor coolant system into First Article production. NuScale said the agreement reinforces its ability to move from design certification to module delivery as customer projects progress.