FIELD: nuclear power engineering. SUBSTANCE: control unit has absorber and at least one internal and one external absorber-holding cartridges. Absorber may be subjected to relative local burnout by more than 90% without ingress of burned material in reactor cooling facility. Control unit has at least three absorber cartridges separated by predetermined gaps so that cartridge exhibits mechanical resistance to respective absorber and can leave initial position in case of absorber expansion. EFFECT: improved design of control unit. 10 cl, 6 dwg
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