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    Mechanical seal assembly and method for sealing an opening in a nuclear power plant
    2.
    发明授权
    Mechanical seal assembly and method for sealing an opening in a nuclear power plant 有权

    公开(公告)号：US10902958B2

    公开(公告)日：2021-01-26

    申请号：US15944430

    申请日：2018-04-03

    Applicant: Framatome Inc.

    Inventor： Lynn Norcutt ,  Wesley Holley ,  Ryan Melcher ,  Timothy Wiger

    IPC: F16L55/162 ,  G21C13/028 ,  F16L41/06 ,  G21C13/036 ,  F16L55/163 ,  F16L55/16 ,  G21C19/20 ,  G21C17/017 ,  G21C19/22 ,  G21C15/18

    Abstract: A method for sealing an opening extending radially from an outer circumferential surface to an inner circumferential surface of a tubular object in a nuclear power plant includes inserting a stopper from outside of the outer circumferential surface through the opening into the tubular object; and actuating a fastener from the outside of the circumferential surface to force the stopper radially outward to seal the opening. A mechanical seal assembly for plugging an opening in a tubular object by contacting an inner circumferential surface of the tubular object includes a stopper configured for insertion into an interior of the tubular object for plugging the opening. The stopper includes a surface configured for matching the inner circumferential surface of the tubular object. The mechanical seal assembly also includes a fastener passing through a hole in the stopper such that the fastener is actuatable from outside of the tubular object to force the surface of the stopper against the inner circumferential surface of the tubular object.

    Lower end replacement of a sleeve that lines a CRDM nozzle in a nuclear reactor
    3.
    发明授权
    Lower end replacement of a sleeve that lines a CRDM nozzle in a nuclear reactor 有权

    公开(公告)号：US12272464B2

    公开(公告)日：2025-04-08

    申请号：US17628501

    申请日：2019-07-22

    Applicant: Framatome Inc.

    Inventor： Ryan Melcher ,  Joseph Gallagher Baier ,  James Andrew Spencer

    IPC: G21C13/036 ,  G21C17/017 ,  G21C19/20 ,  G21C7/12 ,  G21C13/032

    Abstract: A method for replacing a damaged sleeve lining a tube passing through a nuclear reactor pressure vessel. The damaged sleeve has an end including a radially enlarged end portion for resting on a support section of the tube for retaining the damaged sleeve in the tube. The method includes removing the damaged sleeve from a tube; providing a sleeve assembly including a first sleeve with a radially variable end and a retainer; installing the sleeve assembly in the tube so the radially variable end of the first sleeve is received by the support section, the radially variable end being in a radially contracted configuration during installation and being in a radially expanded configuration after the sleeve assembly is installed in the tube; and deforming the retainer from an installation configuration to a retention configuration to retain the radially variable end of the first sleeve in the radially expanded configuration.

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