Abstract: A power supply circuit for use with a power supply system. The power supply circuit can be provided within a power supply module connected with one or more additional power supply modules as part of the power supply system. The power supply circuit includes an optocoupler and a resistor ladder connected to the optocoupler. The circuit asserts a synchronization signal responsive to the optocoupler being energized.

Abstract: A tool measures the force required to move the handle of a railroad track switch between first and second positions that open and close the switch. The tool includes (1) an elongate tool handle; (2) a clamp for clamping the tool handle to the end of the switch handle so the longitudinal axis of the tool handle is parallel to the longitudinal axis of the switch handle and so the tool handle extends a predetermined distance from the switch handle; (3) a grip mounted on the tool handle a fixed distance from the end of the switch handle; and (4) a gauge mounted on the tool handle between the grip and the clamp to measure the maximum force exerted to throw the switch. Another embodiment provides a clamp which fits on standard torque wrenches and mounts on the handle of a railroad track switch to permit the measuring of the force required to open and close the railroad track switch.

Abstract: A method and apparatus for removing from the tube sheet and transfer tubes of a nuclear steam generator sludge deposits which occur from the use of all volatile treatment water chemistry. A continuously activated suction apparatus maintains at a low level the water/sludge inventory on the tube sheet. A high pressure first water lance is oscillated and stepped inwardly along the central tube lane of the generator to dislodge the sludge from the tube plate and heat exchange tubes. After this lance has been stepped inwardly to a predetermined position, a low pressure second water lance is activated and periodically advanced to a position just short of the first lance and functions both to dislodge sludge and to form a water barrier which prevents redeposition of sludge in the clean area.