FIELD: physics, atomic power.
SUBSTANCE: invention relates to controlling reactivity in a nuclear reactor. Illustrated versions describe a reactivity control system for a nuclear fission reactor, having a fast neutron spectrum, particularly for a travelling wave nuclear fission reactor. The system employs a controlled movable rod, which includes neutron absorbent material and nuclear fuel fertile material. Different parts of the rod differ on concentration of the absorbent and fertile material.
EFFECT: enabling fine control of reactivity in response to change in one of parameters thereof.
69 cl, 162 dwg
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