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    Rapid Digital Nuclear Reactor Design Using Machine Learning
    31.
    发明公开
    Rapid Digital Nuclear Reactor Design Using Machine Learning 审中-公开

    公开(公告)号：US20230237226A1

    公开(公告)日：2023-07-27

    申请号：US18106056

    申请日：2023-02-06

    申请人： BWXT Advanced Technologies LLC

    发明人： Ross Evan PIVOVAR ,  Ryan Trigg SWANSON

    IPC分类号： G06F30/27 ,  G06N20/00

    CPC分类号： G06F30/27 ,  G06N20/00

    摘要： A method designs nuclear reactors using design variables and metric variables. A user specifies ranges for the design variables and threshold values for the metric variables and selects design parameter samples. For each sample, the method runs three processes, which compute metric variables for thermal-hydraulics, neutronics, and stress. The method applies a cost function to compute an aggregate residual of the metric variables compared to the threshold values. The method deploys optimization methods, either training a machine learning model using the samples and computed aggregate residuals, or using genetic algorithms, simulated annealing, or differential evolution. When using Bayesian optimization, the method shrinks the range for each design variable according to correlation between the respective design variable and estimated residuals using the machine learning model. These steps are repeated until a sample having a smallest residual is unchanged for multiple iterations. The final model assesses relative importance of each design variable.

    Space reactor gas assist control rod release mechanism
    33.
    发明授权
    Space reactor gas assist control rod release mechanism 有权

    公开(公告)号：US11469004B2

    公开(公告)日：2022-10-11

    申请号：US16880364

    申请日：2020-05-21

    申请人： BWXT Advanced Technologies, LLC

    发明人： James Brian Inman ,  Gary W. Neeley

    IPC分类号： G21C7/16 ,  G21C7/10

    摘要： A control rod assembly for a nuclear reactor having a reactor core and a pressurized fluid source, including a control rod disposed within a control rod sleeve, a lead screw that is selectively secured to the control rod, a trip latch that is secured to a bottom end of the lead screw, the trip latch being selectively securable to a top end of the control rod, a control rod drive motor that is operably connected to the lead screw, and a valve that is in fluid communication with the pressurized fluid source of the nuclear reactor and is movable between a first position and a second position, wherein in the second position of the gas valve the trip latch is in an open position.

    PHOTON PROPAGATION MODIFIED ADDITIVE MANUFACTURING COMPOSITIONS AND METHODS OF ADDITIVE MANUFACTURING USING SAME
    34.
    发明申请
    PHOTON PROPAGATION MODIFIED ADDITIVE MANUFACTURING COMPOSITIONS AND METHODS OF ADDITIVE MANUFACTURING USING SAME 有权

    公开(公告)号：US20220134650A1

    公开(公告)日：2022-05-05

    申请号：US17515625

    申请日：2021-11-01

    申请人： BWXT Advanced Technologies LLC

    发明人： John R. SALASIN ,  Benjamin D. FISHER

    IPC分类号： B29C64/165 ,  G21C3/50 ,  C08K3/22 ,  C08K3/08 ,  C08F2/46 ,  C08F22/10 ,  B33Y10/00 ,  B33Y70/10 ,  B33Y80/00 ,  C08F2/08

    摘要： Additive manufacturing compositions include low-absorbing particles or non-absorbing particles that have an absorbance for wavelengths of 300 nm to 700 nm that is equal to or greater than 0 Au and is less 1.0 Au, such as 0.001 Au≤absorbance≤0.7 Au. Slurries including such particles and an uranium-containing particle and that are used in additive manufacturing processes have an increased penetration depth for curative radiation. Removal of low-absorbing particles or non-absorbing particles during post-processing of as-manufactured products results in pores that create porosity in the as-manufactured product that provide a volume accommodating fission gases and/or can enhance wicking of certain heat pipe coolant liquids. Low-absorbing particles or non-absorbing particles can be functionalized for improved properties, for example, with fissionable material for improved ceramic yields, with burnable poisons or stabilizers for increased homogeneity, with stabilizers for localized delivery of the stabilizer, or with combinations thereof.

    Control rod drive mechanism with separate latch and drive coils
    35.
    发明授权
    Control rod drive mechanism with separate latch and drive coils 有权

    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.

    FISSION REACTOR WITH SEGMENTED CLADDING BODIES HAVING CLADDING ARMS WITH INVOLUTE CURVE SHAPE
    36.
    发明申请
    FISSION REACTOR WITH SEGMENTED CLADDING BODIES HAVING CLADDING ARMS WITH INVOLUTE CURVE SHAPE 有权

    公开(公告)号：US20210202122A1

    公开(公告)日：2021-07-01

    申请号：US17032007

    申请日：2020-09-25

    申请人： BWXT Advanced Technologies LLC

    发明人： James B. INMAN ,  Josh J. BERGMAN

    IPC分类号： G21C21/02 ,  G21C3/04 ,  G21C3/36

    摘要： Plurality of layers form a nuclear fission reactor structure, each layer having an inner segment body, an intermediate segment body, and an outer segment body (each segment body separated by an interface). The layers include a plurality of cladding arms having involute curve shapes that spirally radiate outward from a radially inner end to a radially outer end. Chambers in the involute curve shaped cladding arm contain fuel compositions (and/or other materials such as moderators and poisons). The design of the involute curve shaped cladding arms and the composition of the materials conform to neutronic and thermal management requirements for the nuclear fission reactor and are of sufficiently common design and/or have sufficiently few variations as to reduce manufacturing complexity and manufacturing variability.

    SMALL MODULAR MOBILE FISSION REACTOR
    37.
    发明申请
    SMALL MODULAR MOBILE FISSION REACTOR 审中-公开

    公开(公告)号：US20200373027A1

    公开(公告)日：2020-11-26

    申请号：US16864178

    申请日：2020-05-01

    申请人： BWXT Advanced Technologies LLC

    发明人： Craig D. GRAMLICH ,  William E. RUSSELL, II

    IPC分类号： G21C7/12 ,  G21F5/06

    摘要： A mobile modular reactor, in particular, a graphite-moderated fission reactor, has an active core region and at least a portion of control region(s) that are located within an interior volume of a pressure vessel. Flow annulus features located in the flow annulus between an outer surface of the control rod/fuel rod and an inner surface of the cladding of the channel in which the rod is located stabilizes the flow annulus and maintains a reliable concentricity between the inner and outer claddings that envelope the flow annulus. Flow annulus features are equally circumferentially spaced at longitudinally separated locations and the flow annulus features at successive, longitudinally separated locations are rotationally offset relative to each other. For purposes of transportability, the pressure vessel is sized for mobile transport using a ship, train or truck, for example, by fitting within a shipping container.