TheBM-40A reactor is thenuclear fissionreactor used to power four 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.
It was developed byOKB Gidropress in cooperation withIPPE.
BM-40A has two steam circulation loops.
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