TheOK-150 reactor (1st generation) and its successor, theOK-900 reactor (2nd generation) areSovietmarine nuclear reactors used to power ships at sea. They arepressurized water reactors (PWRs) that useenricheduranium-235 fuel. They have been used in variousRussiannuclear-powered icebreaker ships. The reactor was developed byOKBM.
OK-150 specifications:
Distilled water was used for heat transfer and as a moderator.The core was 1.6 m high by 1 m diameter. It consisted of 219 fuel assemblies, totalling 7,704 fuel pins. There was a biological shield made ofconcrete mixed with metal shavings.
OK-900A specifications:
Three OK-150s were used to power theSoviet icebreakerLenin at the time of its launch in 1957. Later, after damage caused by nuclear accidents in 1965 and 1967, these were removed and replaced with two OK-900s.
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