Abstract: A fuel compact formed by integrally molding coated fuel particles by a press into a cylindrical body and comprising a chamfer having plane or curved surface at its corner to thereby prevent the coated fuel particles from being damaged due to stress on press molding whereby the strength thereof is improved against mechanical contact with a fuel sleeve and a graphite block.

Abstract: This invention provides a dripping nozzle device to produce ADU particles with good sphericity, a device for recovering a feedstock liquid to prepare a uniform feedstock liquid, a device for supplying a feedstock liquid to form drops with a uniform volume, a device for solidifying the surfaces of drops so that the drops will not deform easily when they fall onto and hit the surface of an aqueous ammonia solution, a device for circulating an aqueous ammonia solution so that the uranyl nitrate in the drops can be changed to ammonium diuranate completely, to such an extent that uranyl nitrate in the center of each drop is changed to ammonium diuranate, and an apparatus for producing ammonium diuranate particles with good sphericity. The dripping nozzle device is provided with a single vibrator to vibrate nozzles simultaneously. The device for recovering a feedstock liquid recovers the feedstock liquid remaining in the nozzles and mixes it with a fresh feedstock liquid.

Abstract: In a method for checking for leakage from tubular batteries, when tubular batteries are fed with their respective axial centers aligned in parallel to each other to pass through a leakage check mechanism, a sealed end face of the tubular batteries is irradiated with an X-ray. In accordance with the result of analysis on whether the incident fluorescent X-ray entering a detector contains a fluorescent X-ray associated with an electrolyte component, it is determined whether the tubular batteries have leaked. A length of a detection window of the detector in a direction of feed of the tubular batteries is set to be less than a spacing between the tubular batteries. A length of the detection window oriented orthogonal to the direction of feed is set to be greater than an outer size of the cross-sectional shape of the tubular batteries oriented orthogonal to their axial center.

Abstract: In a method for checking for leakage from tubular batteries, when tubular batteries (Ba) are fed with their respective axial centers aligned in parallel to each other to pass through a leakage check mechanism (12), a sealed end face (33) of the tubular batteries (Ba) is irradiated with an X-ray (34). A fluorescent X-ray (40) coming out of the sealed end face (33) is incident upon a detector (39) through a detection window (35). In accordance with the result of analysis on whether the incident fluorescent X-ray (40) contains a fluorescent X-ray (40) associated with an electrolyte component, it is determined whether leakage has occurred from the tubular batteries (Ba). A length (L1, L3, L5) of the detection window (35) in a direction of feed of the tubular batteries (Ba) is set to be less than a spacing (C1, C2) between the tubular batteries (Ba).

Abstract: [PROBLEMS] To provide an apparatus for manufacturing high quality coated fuel particles by optimizing the design of gas inlet channels and nozzle openings so as to stabilize and uniformize the feeding of a coating material mixed gas into a reaction vessel. [MEANS FOR SOLVING PROBLEMS] The apparatus comprises a fluidized-bed reaction vessel having a gas inlet nozzle at the bottom of the vessel for forming a multilayered coating on each of the surfaces of UO2 fuel kernels by introducing a coating material mixed gas containing a coating gas and a fluidizing gas from the gas inlet nozzle to the interior thereof under a heated environment while the fuel kernels are fluidized.

Abstract: A fuel compact formed by integrally molding coated fuel particles by a press into a cylindrical body and comprising a chamfer having plane or curved surface at its corner to thereby prevent the coated fuel particles from being damaged due to stress on press molding whereby the strength thereof is improved against mechanical contact with a fuel sleeve and a graphite block.

Abstract: This invention provides a dripping nozzle device to produce ADU particles with good sphericity, a device for recovering a feedstock liquid to prepare a uniform feedstock liquid, a device for supplying a feedstock liquid to form drops with a uniform volume, a device for solidifying the surfaces of drops so that the drops will not deform easily when they fall onto and hit the surface of an aqueous ammonia solution, a device for circulating an aqueous ammonia solution so that the uranyl nitrate in the drops can be changed to ammonium diuranate completely, to such an extent that uranyl nitrate in the center of each drop is changed to ammonium diuranate, and an apparatus for producing ammonium diuranate particles with good sphericity. The dripping nozzle device is provided with a single vibrator to vibrate nozzles simultaneously. The device for recovering a feedstock liquid recovers the feedstock liquid remaining in the nozzles and mixes it with a fresh feedstock liquid.

Abstract: The present invention provides an alkaline dry cell which has a negative electrode comprising zinc alloy powders free of mercury as a negative electrode active material and provided in the center portion of the cell, a positive electrode provided around the outer surface of the negative electrode with a separator provided therebetween and a current collector comprising copper or a copper alloy and inserted in the negative electrode and which is inhibited from generation of hydrogen gas and from leakage of liquid. This alkaline dry cell is characterized in that the surface of the current collector is plated with a metal of high hydrogen overvoltage such as tin, lead, copper, zinc or an alloy of two or more of these metals.