Abstract: A timing data acquisition device includes a data signal generator, which is configured to generate a plurality of data signals by repeatedly delaying a first periodic timing signal in increments of a first delay value, and a clock signal generator, which is configured to generate a plurality of clock signals by repeatedly delaying a second periodic timing signal in increments of a second delay value exceeding the first delay value. A plurality of D flip-flops are also provided. The flip-flops have: (i) data terminals responsive to respective ones of the plurality of data signals, and (ii) clock terminals responsive to respective ones of the plurality of clock signals.

Abstract: A double strip mixing grid for nuclear reactor fuel assemblies is disclosed. This grid is fabricated by intersecting at right angles a plurality of double strips, each fabricated by welding two thin sheets together into a single structure with coolant channels. The mixing grid, having the channels, effectively mixes low temperature coolant with high temperature coolant within a fuel assembly, thus improving the thermal efficiency of the fuel assemblies. This mixing grid also effectively prevents the coolant from being partially overheated, thus improving the soundness of nuclear reactors. This mixing grid also has swirling flow blades and/or lateral flow blades to further improve the thermal efficiency of the fuel assembly. This mixing grid elastically supports the fuel rods by the sheets of the double strips, collaterally acting as positioning springs.