VM-4 reactor
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The VM-4 reactor is the nuclear fission reactor used singly to power the Soviet Navy's Project 670 Скат and Чайка-Б (Charlie) submarines, and in pairs to power the Project 671 Ёрш and Щука (Victor), Project 667 Мурена, Кальмар, and Дельфин (Delta), and Project 667 Навага, Налим, Груша, and Андромеда (Yankee) second-generation submarines. It is a pressurized water reactor (PWR), using 20% enriched uranium-235 fuel to produce 70-90 MWt of power.