Patent ID: 9190177
Filing Date: 2015-11-17
Classification: G21C,Y02E

Abstract:
1. A reactivity control assembly for a nuclear fission reactor, the reactivity control assembly comprising: a reactivity control rod including neutron absorbing material configured to absorb neutrons, at least a portion of the neutron absorbing material including fertile nuclear fission fuel material and a neutron absorbing poison, the reactivity control rod has a first region and a second region; a first concentration of the neutron absorbing poison and a third concentration of the fertile nuclear fission fuel material are disposed in the first region of the reactivity control rod, and a second concentration of the neutron absorbing poison and a fourth concentration of the fertile nuclear fission fuel material are disposed in the second region of the reactivity control rod; and wherein a reactivity effect of the first concentration of the neutron absorbing poison is substantially equalized with a reactivity effect of the fourth concentration of the fertile nuclear fission fuel material; and at least one sensor associated with the reactivity control rod, the at least one sensor being configured to sense status of at least one reactivity parameter associated with the reactivity control rod.