US 12,469,611 B2
Reactor control device
Daniel Robertson, Derby (GB); and Brett Longstaffe, Derby (GB)
Assigned to Rolls-Royce SMR Limited, Derby (GB)
Appl. No. 17/913,356
Filed by Rolls-Royce SMR Limited, Derby (GB)
PCT Filed Mar. 26, 2021, PCT No. PCT/EP2021/057873
§ 371(c)(1), (2) Date Sep. 21, 2022,
PCT Pub. No. WO2021/191407, PCT Pub. Date Sep. 30, 2021.
Claims priority of application No. 2004454 (GB), filed on Mar. 27, 2020.
Prior Publication US 2023/0162874 A1, May 25, 2023
Int. Cl. G21C 7/26 (2006.01); G21C 7/06 (2006.01); G21C 9/033 (2006.01)
CPC G21C 7/26 (2013.01) [G21C 7/06 (2013.01); G21C 9/033 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A reactor control system for a nuclear reactor, the reactor control system comprising:
one or more hollow tubes comprising a neutron absorbing material, each of the one or more hollow tubes having a first end and a second end;
a pump connected to the first end of each of the one or more hollow tubes and operable to control an amount of a first fluid within that hollow tube, the first fluid comprising a neutron moderator,
wherein:
the reactor control system is configured to control the pump based on a level of reactivity in the nuclear reactor, and
the second end of each of the one or more hollow tubes is in fluid communication with a second fluid, the second fluid having a neutron moderating capacity lower than 10% of that of the first fluid.