Abstract: A charged particle generating device such as an ion implanter, a secondary ion mass spectrometer having a good mounting operability, a simple construction, good characteristics such as sensitivity, etc., owing to the fact that there is disposed a focusing electrode composed of the cylindrical electrodes disposed coaxially with each other, at least the inner electrode thereof having a plurality of openings.

Abstract: In a secondary charged particle analyzing apparatus such as a secondary ion mass analyzing apparatus, a scanning type electron mass analyzer, etc., in order to obtain a high resolving power and a high sensitivity, trajectories of secondary charged particles are corrected by means of an accelerating lens formed in a secondary charged particle extracting section disposed within the apparatus.

Abstract: Evaluation for deformations of the channel box of a fuel assembly in a nuclear reactor core in which deformations of the channel box which has been used for exposure so as to be deformed are estimated for future exposure through computation and process of data of core characteristics, data of material properties and shapes of channel boxes, data of initial deformations of the channel box, data of loading patterns and the like, thereby to judge whether the estimated deformations are agreeable for reusing the channel box in the future exposure, or not.

Abstract: Provided is a fuel assembly for a boiling water reactor. The fuel assembly comprises fuel rod arranged in an 8-lines/8-columns square lattice, water rod and a channel box surrounding these fuel rods and water rods. A central portion corresponds to 80% of the fuel rod comprises fuel pellet having an outer diameter of 10.31 mm and inner diameter of 5.95 mm.

Abstract: This invention relates to fuel assembly for Fast Breeder Reactor, such as wire spacer fuel assembly, in which the thickness of cladding tubes in the upper end portion of fuel pins positioned in the peripheral region of the assembly is made larger than that of the remaining portion. Thus, according to the present invention, a bundle of the fuel pins can be restrained from displacement in one direction in the assembly when the fuel pins are deformed by heat and neutron radiation in operation of a nuclear reactor, and further the sectional portion of the fuel pins can be prevented from deformation caused by a load externally operated on the fuel pins. Furthermore, the thickness of the cladding tubes can be prevented from reduction caused by fretting corrosion which is caused by the contact of the cladding tubes with a wrapper tube.