Abstract: A contact ultrasonic transducer head assembly. A stationary housing is adapted to be fitted to a remotely operated manipulator. A movable assembly slidably received by the stationary housing has a plurality of independently suspended ultrasonic transducers mounted thereon. A position encoder mounted in the movable assembly monitors movement within the stationary housing. A limit switch is used to electrically disable the remotely operated manipulator when the movable assembly slides a predetermined distance into the stationary housing to prevent damage to the transducers or the surface being inspected.

Abstract: A remotely installed, operated and removed manipulator for steam generator includes a mast, an articulating arm attached to the mast, capable of operating in the bottom or top head of a once through steam generator or the head of a recirculating steam generator. Each embodiment can be remotely installed and removed. The manipulator provides precise access to tubes and can sustain substantial loads, so the apparatus can perform much of the tube work that must be performed inside a steam generator.

Abstract: A sludge lance wand for cleaning once through steam generator tubes. A curved high pressure fluid feed tube has a plurality of feed tube extensions attached at one end and a first nozzle brace attached at the other end and in fluid communication with the feed tube. A second nozzle brace bolted to the first nozzle brace retains nozzle blocks in position between the two braces. The nozzle blocks are in fluid communication with the first nozzle brace and are provided with nozzle openings angled for cleaning the triangular-pitch positioned tubes in a once through steam generator. O-ring seals on each end of the nozzle blocks press fit against the braces to prevent leakage and insure that full fluid flow is directed through the nozzle openings.

Abstract: A typical embodiment of the invention provides a combination feedwater and "cooldown" water spray head that is centrally disposed in the lower portion of a nuclear power plant steam drum. This structure not only discharges the feedwater in the hottest part of the steam drum, but also increases the time required for the feedwater to reach the steam drum shell, thereby further increasing the feedwater temperature before it contacts the shell surface, thus reducing thermal shock to the steam drum structure.