G - Physics – 21 – C
Patent
G - Physics
21
C
359/27
G21C 7/14 (2006.01)
Patent
CA 1253637
ABSTRACT An electromagnetic control bar drive device, with reduced heat losses The electromagnetic device is suitable for use in actuating a pressurized water reactor control bar. It comprises a shaft and a fluid-tight casing in which are movable longitudinally a first and a second sets of grippers for gripping the shaft, staggered in the longitudinal direction. The first set of grippers is associated with a movable pole co-operating with a holding coil, carried by the casing and movable by energization and de-energization of the coil between a position in which the first set of grippers holds the shaft and a position in which it releases it. The second set of grippers is associated with a movable plunger co-operating with a transfer coil and movable by energization and de-energization of the transfer coil to and from a position in abutment against an other pole. The other pole is movable between two positions spaced apart by a given step. The movable pole belongs to a mechanism for cutting off a path coolant fluid constit- uting a thermosiphon causing convection flow between the inside of the vessel and the space defined by the casing.
500540
Le Saulnier Guy
Savary Fernand
Framatome
Robic Robic & Associes/associates
LandOfFree
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