US, Japan and South Korea set SMR deployment plan

The United States, Japan and South Korea have established an implementation plan to support small modular reactor deployments in third countries, giving their July civil nuclear cooperation framework a next step while leaving projects and timing unspecified. The September 23 announcement also pointed to a separate four-company effort to advance the BWRX-300 in Europe, with an industry investment ambition above $150 billion.

Key facts

• The three governments signed their memorandum of cooperation in Ankara on July 7, 2026.
• The US announced the implementation plan on September 23, 2026, after a trilateral ministerial meeting alongside the UN General Assembly.
• The State Department release named four companies in a separate BWRX-300 cooperation framework: GE Vernova, Hitachi, Samsung C&T and Poland’s SGE.
• The companies’ stated ambition is to promote more than $150 billion in reactor investments; the release did not describe this as committed project financing.

What happened

The US Department of State announced the plan in a media note issued after the foreign ministers of the United States, Japan and the Republic of Korea met on the margins of the United Nations General Assembly in New York. The three countries had signed a memorandum of cooperation on civil nuclear energy in Ankara on July 7. The new plan supports that memorandum’s aim of deploying SMRs in countries beyond the three participants, according to the State Department announcement.

The public statement provides little operational detail. It describes an “ambitious agenda” for SMR fleet deployment to meet energy demand and says the arrangements support shared security interests. It does not list a target country, a reactor vendor, a financing vehicle, a construction schedule or a first project. Yonhap reported that the department did not elaborate on the implementation plan in its announcement.

That distinction matters. An implementation plan is a formal step beyond a broad political statement, but the announcement alone does not establish a procurement, export license, host-country agreement or construction commitment. Those would need to emerge through later government disclosures, vendor agreements and decisions by countries considering nuclear power.

The same State Department release covered a second initiative that is more specific about the commercial participants. GE Vernova, Hitachi, Samsung C&T and Poland’s SGE signed an industry framework to advance deployment of the BWRX-300 small modular reactor in Europe. Deputy Secretary of State Christopher Landau attended the signing, according to the department.

Washington described the group’s goal as reliable baseload power for Europe and said the companies aimed to promote more than $150 billion in reactor investments in the coming years. That is an ambition attributed to the consortium, not a government guarantee or a confirmed total for signed plant contracts. The announcement does not name the projects that would make up that investment figure.

Why it matters

SMR exports require more than a reactor design. A prospective buyer also needs regulatory cooperation, a financing structure, fuel and supply-chain arrangements, a construction partner and a plan for long-term operations. By setting up a trilateral process focused on deployment in other countries, Washington, Tokyo and Seoul are positioning their governments to coordinate around those hurdles rather than leaving each vendor to pursue foreign markets alone.

The trio brings different industrial assets to the effort. US companies have reactor designs and nuclear services; Japanese firms have manufacturing and engineering experience; South Korea has an established export sector and experience delivering large nuclear projects abroad. The July memorandum’s fact sheet is the government’s detailed public reference for the cooperation framework, but the September announcement does not say how the three governments will divide work, screen recipient countries or decide which designs to support.

For the wider export market, the new diplomatic plan and the BWRX-300 company framework are related but distinct. The first is a three-government arrangement for SMR deployments in unspecified third countries. The second is an industry partnership naming four companies and targeting European deployment of one reactor design. They should not be conflated into a single order or a list of projects already cleared to proceed.

NNN has followed the commercial and diplomatic links between Washington and Seoul in its coverage of the South Korea-US eight-reactor framework and the reported South Korean reactor investment discussions. Those stories concern a separate large-reactor investment discussion. The September SMR plan does not confirm or resolve the reactor mix, financing, or status of that earlier framework.

Background

The term small modular reactor covers a range of designs and capacities; it is not a single standardized product. Export projects still have to clear the host country’s licensing and siting processes, settle commercial terms and establish a credible plan for construction and fuel supply. Government cooperation can help open doors, but it does not substitute for those project-specific approvals.

The BWRX-300 is a GE Vernova Hitachi Nuclear Energy design. In this announcement, its route to European deployment is tied to the four-company partnership, while the broader trilateral plan does not identify it as the preferred design for third-country projects. Keeping those tracks separate is essential when assessing what the September statement actually commits the parties to.

What's next

The next evidence to watch is operational: publication of the implementation plan or its work program, named partner countries, vendor or financing agreements, and specific project milestones. The State Department’s September 23 release names none of those. For Europe, watch for the BWRX-300 consortium to identify host projects and clarify whether its investment ambition translates into signed orders, funding commitments or a staged pipeline.

Until governments or companies disclose those details, the verified development is the creation of a cooperation plan, not a reactor deployment decision. The $150 billion figure remains the consortium’s stated investment ambition; the announcement does not assign it to a defined set of plants.