Process and device for replacing heater in PWR pressurizer. Procede et dispositif de remplacement d'une canne chauffante d'un pressuriseur d'un reacteur nucleaire a eau sous pression

To assure the tight fixation of replacing heater on a pressurizer penetration sleeve, a gas metal-arc welding single pass is executed. A tubular shaft is fixed over end of heater projecting from penetration sleeve. Over shaft is fixed tubular support for the torch which can rotate about axis of support axis heater. Welding torch and welding wire feeder roll are rotated in synchronisation by appropriate motors. Weld is made in single pass round periphery of heater and penetration sleeve.