The VM reactor (Russian: ÃÂõðúÃÂþàÃÂÃÂ) is type of various series of nuclear pressurized water reactors (PWR). They were used singly or in pairs to power the Soviet Navy's submarines.
It was developed by NIKIET.
In December 2025, it was reported that a ship called the MV Ursa Major that sunk near Spain in 2024 was carrying two VM-4SG reactors intended for North Korea. North Korea has claimed to be completing a nuclear submarine.
Series
- The VM-A reactor was the nuclear fission reactor used in pairs to power the Soviet Navy's Project 658 and 701 (), Project 659 and 675 (), and Project 627 ÃÂøà() first-generation submarines. It was a pressurized water reactor (PWR), using 21% enriched uranium-235 fuel to produce of power. This is the reactor that powered .
- The VM-4 reactor is a nuclear fission reactor using 20% enriched uranium-235 fuel to produce of power. It is used:
- singly to power the Project 670 áúðàand çðùúð-à() submarines
- in pairs to power the Project 671 ÃÂÃÂàand éÃÂúð (), Project 667 ÃÂÃÂÃÂõýð, ÃÂðûÃÂüðÃÂ, and ÃÂõûÃÂÃÂøý (), and Project 667 ÃÂðòðóð, ÃÂðûøü, ÃÂÃÂÃÂÃÂð, and ÃÂýôÃÂþüõôð () second-generation submarines.
- The VM-5 reactor was the nuclear fission reactor used in a pair to power the Soviet Navy's Project 661 ÃÂýÃÂðà- Anchar () second-generation submarine K-222. It was a pressurized water reactor (PWR) using enriched uranium-235 fuel to produce of power.
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