Patent ID: 9583226
Date: 2017-02-28
CPC Classifications: G21C,Y02E

Claim:
1. A cooling duct assembly for a control element drive mechanism that is installed on an upper assembly of a nuclear reactor that comprises a control element drive mechanism that is disposed above a reactor head; a cable tray disposed above the control element drive mechanism, and a cooling air handling device that is disposed above the cable tray, the cooling duct assembly comprising: a cylindrical skirt that is combined on a circumference of the reactor head and has first air channels in an inner side thereof; a lower duct that is combined with an upper side of the skirt, has second air channels connected to the first air channels, is disposed to surround a circumference of the control element drive mechanism, and has flow spaces for allowing air around the reactor head to flow towards the control element drive mechanism, an upper duct, one edge of which is combined with the cooling air handling device, and another edge of which is detachably combined with the lower duct; and a lifting rig that moves the upper duct up and down, wherein the lifting rig comprises a guide rail that extends in upper and lower directions of the upper duct and is combined with an outer surface of the upper duct, a guiding block that supports the guide rail by being attached to the cable tray or the cooling air handling device , a wire having an edge fixed on a lower edge of the upper duct, a winch that lifts and descends the upper duct by winding or unwinding the wire, and a pulley that is disposed between the edge of the wire and the winch to guide the wire, wherein air that cools the control element drive mechanism is discharged to the outside after sequentially passing through the first air channels of the skirt, the second air channels of the lower duct, the upper duct, and the cooling air handling device, and the upper duct separated from the lower duct is lifted together with the cooling air handling device, and the edge of the upper duct is detachably combined with the cooling air handling device.