TheOK-550 reactor is thenuclear fissionreactor used to power three of the seven boats of theSoviet Navy's Project 705 Лира (Lira orAlfa in NATO designation) fourth generation submarines. It is aliquid metal cooled reactor (LMR), usinghighly enricheduranium-235 fuel to produce155 MWt of power.
OK-550 has three separate steam circulation loops, and was used in the boats built atSeverodvinsk.
The reactor was developed byOKBM.
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