VM reactor
The VM reactor is type of various series of nuclear pressurized [water reactor]s. They were used singly or in pairs to power the Soviet Navy's submarines.
It was developed by .
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 Кит first-generation submarines. It was a pressurized water reactor, 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 Скат and Чайка-Б submarines
- * in pairs to power the Project 671 Ёрш and Щука, Project 667 Мурена, Кальмар, and Дельфин, and Project 667 Навага, Налим, Груша, and Андромеда second-generation submarines.
- The VM-5 reactor was the nuclear fission reactor used in a pair to power the Soviet Navy's Project 661 Анчар - Anchar second-generation submarine K-222. It was a pressurized water reactor using enriched uranium-235 fuel to produce of power.