Abstract: A replacement guide pin assembly is provided for aligning a nuclear fuel assembly with an upper core plate of a nuclear reactor core. One embodiment of the guide pin assembly includes an elongated guide pin body, a ferrule, and a lock screw. The guide pin body has a lower expandable base insertable within a hole in the top nozzle, and capable of expanding radially outwardly relative to a longitudinal axis of the guide pin body to provide an interference fit with the top nozzle. The ferrule is insertable within the top nozzle hole, interfitted with the guide pin body, and capable of imparting a radially and outwardly directed force on its lower expandable base to expand it within the hole of the top nozzle and thereby secure the guide pin body to the top nozzle in response to a predetermined displacement of the ferrule relative to the guide pin body along its longitudinal axis.

Abstract: An electronic board game comprising a flat horizontal translucent surface with a light source, a plurality of playing pieces and a hand held mover object. The translucent surface has an array of playing positions located on it's top surface and a plurality of light sources located thereunder. The light source consists of a bulb in series with a reed switch and energy source. The playing pieces consist of a magnetic pawn type object, with all pawns having the same polarity at their tops. The hand held mover object contains a magnet having the same polarity at it's top as the playing pieces, therefore, when the mover object is placed in close proximity to a playing piece it will repel it along the board's surface across the plurality of playing positions. The mover object can take the form of a ring, pistol, finger or any other shape, depending on the game logo. The light source is activated by the magnetic flux of the playing piece as it advances over a playing position having a reed switch located thereunder.