Nuclear reactor control bar drive device

Details Nuclear reactor control bar drive device Nuclear reactor control bar drive device

G - Physics

21

C

359/33, 359/50

G21C 7/12 (2006.01)

Patent

CA 1261979

ABSTRACT OF THE DISCLOSURE A nuclear reactor control bar drive device with mobile valve is provided, comprising a cluster guide placed above the core, a casing containing a drive mechanism connected to the inside of the reactor by a sheath passing sealingly through the lid of a vessel containing the core, a control shaft movable vertically in the sheath, connecting the mechanism to the bar and passing, with radial clearance, through an upper plate for closing the guide, as well as a thermal protection sleeve interposed radially between the shaft and the sheath and able to bear by an end piece on said upper plate. The sleeve is pierced, below the sheath, with a calibrated passage for intake of fluid into the guide through the clearance and a non return valve is disposed between the sleeve and the sheath, is movable vertically with respect thereto and co-operates with a seat of the sheath for allowing the fluid to flow only towards the drive mechanism.

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