VT-1 reactor

It is a liquid metal cooled reactor (LMR), using highly enriched uranium-235 fuel to produce 73 MW of power.

K-27 was a November-class first generation nuclear submarine, and the only one of its class fitted with liquid metal cooled reactors.

However the seven-member Alfa class were subsequently fitted with liquid metal cooled reactors.

Its usage in the K-27 led to a nuclear incident with 9 fatalities.

[1] It was developed by OKB Gidropress in cooperation with IPPE.