Dismantling nuclear reactor components underwater

    公开(公告)号:FR2743445A1

    公开(公告)日:1997-07-11

    申请号:FR9600226

    申请日:1996-01-10

    Applicant: FRAMATOME SA

    Abstract: The structure (1) of sleeves and plates which encloses the core of a pressurised water-cooled nuclear reactor is dismantled by cutting while immersed in the pond (9) adjoining the reactor vessel (8). The less radioactive sections are placed in containers (27) of the type used to carry reactor guide tubes when these are replaced, and the more radioactive sections are placed in containers (28) of the type used to carry fuel assemblies. Containers (27,28) are removed from the pool separately. Also claimed is the cutting equipment used in the pool.

    2.
    发明专利
    未知

    公开(公告)号:ES2077195T3

    公开(公告)日:1995-11-16

    申请号:ES91402348

    申请日:1991-09-02

    Applicant: FRAMATOME SA

    Abstract: In order to repair the tapping (2b) of a tapped opening (2) of large diameter, a threaded insert is introduced by screwing into the tapped opening. The threaded insert is introduced into the tapped opening (2) wound on a threaded section of the surface of a drum which is screwed inside a tapped centring ring engaged in the entrance section (2a) of the tapped opening (2). The threaded insert is placed firmly against the tapping (2b) and the threaded insert is fixed firmly in place by fitting a pin traversing the threaded insert and engaged in the wall of the tapped opening (2). The invention also relates to tools allowing the use of the method according to the invention. The method according to the invention applies in particular to the repair of tappings in openings (2) machined in the tank flange (1) of a pressurized water nuclear reactor and allowing the sealed fixing of the tank cover by means of studs. … …

    3.
    发明专利
    未知

    公开(公告)号:FR2645328B1

    公开(公告)日:1991-07-19

    申请号:FR8904417

    申请日:1989-04-04

    Applicant: FRAMATOME SA

    Abstract: The centring apparatus comprises a centring plate (23) mounted rotatably on a support element (21) about an axis parallel to the axis of the steam generator tubes, supporting two radial-expansion fixing grippers (39) and a means (22, 27, 28) for motorised orientation of the plate (23) about its axis, the fixing grippers (39) being positioned on the plate in relative positions corresponding to openings for passage of the tubes (13) through the tubular plate (18). … …

    8.
    发明专利
    未知

    公开(公告)号:DE69111364T2

    公开(公告)日:1995-12-07

    申请号:DE69111364

    申请日:1991-09-02

    Applicant: FRAMATOME SA

    Abstract: In order to repair the tapping (2b) of a tapped opening (2) of large diameter, a threaded insert is introduced by screwing into the tapped opening. The threaded insert is introduced into the tapped opening (2) wound on a threaded section of the surface of a drum which is screwed inside a tapped centring ring engaged in the entrance section (2a) of the tapped opening (2). The threaded insert is placed firmly against the tapping (2b) and the threaded insert is fixed firmly in place by fitting a pin traversing the threaded insert and engaged in the wall of the tapped opening (2). The invention also relates to tools allowing the use of the method according to the invention. The method according to the invention applies in particular to the repair of tappings in openings (2) machined in the tank flange (1) of a pressurized water nuclear reactor and allowing the sealed fixing of the tank cover by means of studs. … …

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