FIELD: nuclear power engineering; nuclear power plants incorporating fast breeder reactors using liquid-metal coolant (sodium). SUBSTANCE: control rod whose absorbing part has neutron moderator and absorber is provided, in addition, with one more neutron moderator placed along rod axis beyond its absorbing part so that it abuts against one of ends of absorbing part. EFFECT: improved operating safety of reactors. 2 cl, 5 dwg
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