Abstract: A fuel assembly has a fuel spacer consisting of a water rod having an outer diameter greater than that of fuel rods and a large number of circular sleeves into which the fuel rods are inserted. The fuel spacer has four bridge members. Both ends of these bridge members are fitted to two of eight circular sleeves which are adjacent one another in the diagonal direction of the fuel spacer. Both ends of each bridge member are bent so that its center projects outwardly away from the water rod.

Abstract: A lighting and signaling device is provided which is capable of both lighting and signaling intermittent signals such as Morse code signals. The lighting and signaling device has a switch for selecting among an unlit mode, a continuous lighting mode, and an intermittent lighting mode; a clock circuit for oscillating at a single frequency in the intermittent lighting mode; a plurality of decade counters responsive to the clock circuit; and a driver for outputting periodic signals from outputs from the decade counters. The decade counters are arranged so as to output a series of dot and dash signals according to a predetermined program. The circuitry is housed within a portable flashlight.