FIELD: nuclear reactors. SUBSTANCE: device has case 1, actuator 2, rack gear 3 which is in mesh with external rack 4 whose lower part carries bushing 5 with gear 6. Internal rack 7 is mounted inside external one 4 and is joined with control rod 8. Fixed rack 9 is secured to inner wall of case 1. Gear 9 is in permanent mesh with fixed rack 9 and with internal movable rack 7. EFFECT: reduced actuator size and improved reliability. 3 dwg
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