摘要:
A fiberscope inspection system for a nuclear steam generating plant includes an optical unit and a transport unit respectively coupled to opposite ends of the fiberoptic cable and mounted at space-apart points on a trolley beneath the tube sheet, with the fiberoptic cable hanging freely in a catenary between the two units, both of which are coupled by cable to a remote control station. The optical unit is self-contained and includes a light source, a video camera and a focusing mechanism and chain and sprocket remotely- controlled drive means for controlling the focusing mechanism. The transport unit includes a cartridge comprising a coil of a steel drive tape, the leading end of which is welded to a split-sleeve coupling disposed in clamping engagement with the leading end of the fiberoptic cable, the tape being engageable by a drive sprocket for driving same to feed and retract the fiberoptic cable. Position sensing means are provided for monitoring the position of the fiberscope probe.
摘要:
A sleeving method wherein a metal sleeve (16) is inserted into a tube (10) so as to bridge a defective region of the tube (10). The sleeve (16) has teeth (40) on the outside thereof which tightly contact the inside surface of the defective tube (10) and create a labyrinth-type seal. The sleeve (16) is then internally pressurized in the area where the teeth (40) are located. This expansion of the sleeve (16) causes the teeth (40) to engage the tube (10). The other end of the sleeve (16) can then be either similarly attached to the tube (10) or welded to the tube (10). Next, the remainder of the sleeve (16) is expanded which causes the sleeve (16) to shrink in length which results in the teeth slightly penetrating the inside surface of the tube thereby creating a leak tight seal therebetween.
摘要:
Apparatus that may be assembled inside the head of a steam generator and can perform various repair and inspection operations on the steam generator's tubes and tubesheet. Selective engagement of an included tool holder (102) and associated tools with the tube (18) and tubesheet (14) is provided by a gear train which has a portion which houses a tool drive motor (78). The drive motor (78) provides power to a tool holder-mounted tool chuck (104) for driving the various tools insertable therein, the drive motor (78) being disposed within a hollow lead screw (96) of the tool holder (102). The apparatus is compact and easily insertable into, and remotely operable in, the limited space in the steam generator head.
摘要:
During a sleeving operation, to limit the exposure of personnel to radioactivity within the channel head of a nuclear steam generator, a cartridge sleeve-blank loader (21) for automatically sleeving a plurality of linear tubes is provided. The loader includes a removable turret (25) of drum which carries a plurality of preloaded slightly bowed and indexed sleeve blanks (27) to be inserted by a lifter (29) into selected tubes (31). The tube receiving the sleeve holds the sleeve in the tube when the lifter is retracted. In inserting the sleeve blank, the lifter moves at a low speed until the leading end of the sleeve enters a tube, and then moves faster. An operator briefly enters the manway of the channel head and replaces the unloaded turret with a preloaded turret.
摘要:
During a sleeving operation, to limit the exposure of personnel to radioactivity within the channel head of a nuclear steam generator, a cartridge sleeve-blank loader for automatically sleeving a plurality of linear tubes is provided. The loader includes a removable turret or drum which carries a plurality of preloaded slightly bowed and indexed sleeve blanks to be inserted by a lifter into selected tubes. The tube receiving the sleeve holds the sleeve in the tube when the lifter is retracted. In Inserting the sleeve blank, the lifter moves at a low speed until the leading end of the sleeve enters a tube, and then moves faster. An operator briefly enters the manway of the channel head and replaces the unloaded turret with a preloaded turret..
摘要:
During a sleeving operation, to limit the exposure of personnel to radioactivity within the channel head of a nuclear steam generator, a cartridge sleeve-blank loader for automatically sleeving a plurality of linear tubes is provided. The loader includes a removable turret or drum which carries a plurality of preloaded slightly bowed and indexed sleeve blanks to be inserted by a lifter into selected tubes. The tube receiving the sleeve holds the sleeve in the tube when the lifter is retracted. In Inserting the sleeve blank, the lifter moves at a low speed until the leading end of the sleeve enters a tube, and then moves faster. An operator briefly enters the manway of the channel head and replaces the unloaded turret with a preloaded turret..