"We plan to launch the first nuclear-powered submarine in the mid-2030s, and push ahead with development to enter operational service in the latter half of the 2030s or later," Defense Minister Ahn Gyu-back told reporters at the South Korean naval base at Jinhae as Seoul released an initial roadmap for nuclear-powered submarines.
The timeline Ahn Gyu-back announced
South Korea's Ministry of National Defense (MND) published what it calls the "Basic Plan for the Development of Nuclear Submarines for the Republic of Korea" and set a public timetable: a first launch in the mid-2030s with an aim for operational service in the latter half of the 2030s or later. The roadmap positions the program as a multi-year national initiative rather than an immediate capability surge.
Jang Bogo N Project: domestic development of reactors and propulsion
The program has been designated the "Jang Bogo N Project" and — the MND says — will be developed and constructed domestically using indigenous technologies. The plan explicitly identifies nuclear reactors and the future boats' energy conversion systems as technologies to be developed inside South Korea rather than sourced abroad.
Operational purpose: responding to North Korea's submarine-launched threats
The MND frames nuclear submarines as possessing "dramatically enhanced operational capabilities" over diesel-electric boats, citing improved underwater endurance and mobility. The plan states these vessels "will play a core role in responding to threats such as North Korea’s submarine-launched nuclear and missile threats," placing the capability directly in the context of the peninsula's security environment.
Non-proliferation commitments, procurement of low-enriched uranium, and IAEA safeguards
The published plan seeks to address nuclear non-proliferation and safety concerns. It reaffirms South Korea's pledge "to neither seek nor develop nuclear weapons" and says Seoul will implement nuclear non-proliferation obligations when acquiring low-enriched uranium (LEU) from the United States. The program also states it will "establish a system of safeguards together with the International Atomic Energy Agency Agency," per the MND's plan.
Industrial and economic expectations: jobs, shipbuilding, and a 30-year service life
The MND projects significant industrial effects from the Jang Bogo N Project, estimating the program will create more than 40,000 jobs across South Korea's shipbuilding, nuclear and defense industries. The Ministry also notes an expected operational life for the submarines of roughly 30 years, indicating the program is intended as a long-term national capability with sustained maintenance and industrial involvement.
What this means for the United States, South Korea's shipbuilding and nuclear industries, and the MND
- United States: The plan references prior U.S. engagement — noting South Korea "only secured approval from US President Donald Trump for US nuclear propulsion technology in October" — and says Seoul will acquire low-enriched uranium from the United States under implemented non-proliferation obligations.
- South Korea's shipbuilding and nuclear industries: The MND's estimate of more than 40,000 jobs signals large-scale domestic work on reactors, energy conversion systems, and hull construction; the Ministry connects this project to recent Korean moves in nuclear commercial shipping, including certification for a nuclear-powered liquefied natural gas carrier and the use of Small Modular Reactors for ship propulsion.
- The MND: By labeling the effort a "national strategy project," the Ministry has positioned itself as architect and steward of both the technical program and its declared non-proliferation and safety frameworks, including an announced plan to coordinate safeguards with the International Atomic Energy Agency Agency.
Seoul's announcement stitches together technical ambition, industrial policy and diplomatic reassurance: a domestically built nuclear-propulsion program, a multi-decade service outlook, and explicit promises about non-proliferation and safety. The roadmap sets firm public milestones — mid-2030s launch and operational service in the latter half of the 2030s or later — while also committing to specific procurement and oversight arrangements with the United States and the International Atomic Energy Agency Agency. The immediate, concrete questions the plan leaves for observers are likewise narrow: will the indigenous reactor and energy-conversion designs meet the program's development schedule, and will the agreed safeguards and LEU procurement arrangements be implemented on the timeline the MND has laid out?
Source: https://breakingdefense.com/2026/05/south-korea-outlines-nuclear-powered-submarine-plan/
