公开(公告)号：US11309095B2

公开(公告)日：2022-04-19

申请号：US16831201

申请日：2020-03-26

申请人： BWXT Advanced Technologies LLC

发明人： Earl Brian Barger ,  Scott Lee Fitzner ,  Roger Dale Ridgeway ,  Scott James Shargots

IPC分类号： G21C7/12 ,  G21C7/14 ,  G21C9/02

摘要： A control rod drive mechanism for use in a nuclear reactor including a reactor core disposed in a pressure vessel, including a control rod configured for insertion into the reactor core, a lead screw, the control rod being secured to the bottom end of the lead screw, a drive mechanism including a torque tube having a top end and a bottom end, a pair of segment arms that are pivotably mounted to the torque tube, a pair of roller nuts, each roller nut being rotatably secured to the bottom end of a respective segment arm, and a drive motor including a stator and a rotor secured to the top end of the torque tube that includes a plurality of permanent magnets embedded therein, wherein the stator defines a central bore in which the rotor is disposed, and a latch coil assembly including a latch coil, wherein the latch coil assembly defines a central bore in which the top ends of the segment arms are disposed radially-inwardly of the latch coil.