Emergency cut-off device for a steam generator tube in case of leakage

摘要

the invention relates to a sealing device for backup in the event of a leak, a tube of a steam generator where the heat of vaporization is supplied by a liquid metal flowing in contact with the outer surface of the tube.;the system includes the terminal portion of the tube (6) connected to the water supply device (10), a tubular casing (18) interposed in the path of the feed water. the casing includes a valve (26) connected to the casing (18) by a piece of fracture (27).the failure of the coin (27) under the effect of an increased flow of water in the event of a leak, closes the outlet (25) of the casing (18). the device also includes, on the terminal portion of the tube (6) connected to the collector of a casing containing a steam valve to close the outlet free steam in the event of a leak in the tube (6).;the invention applies in particular to the steam generators of nuclear reactors cooled by liquid sodium fast reactors.