Abstract: A method of producing a light water reactor fuel assembly may include: setting conditions at least concerning an operation cycle period and burnup; setting an initial enrichment of enriched uranium; calculating excess reactivity of a light water reactor core where light water reactor fuel assemblies including the enriched uranium are burned until an end stage of a final operation cycle; determining whether a condition where excess reactivity at an end of a first operation cycle in the burnup calculation step is close to a predetermined positive value is true or not; and returning to the setting of the initial enrichment, when it is determined at the determining that the situation is not true, or deciding an enrichment of the enriched uranium when it is determined that the situation is true.

Abstract: According to an embodiment, a design method for a light-water reactor fuel assembly comprises: accumulating a determined fuel data, showing that each of a combination of p·n/N and e is feasible as the core or not, wherein N is a number of the fuel rods in the fuel assembly, n is a number of the fuel rods containing the burnable poison, p is a ratio wt % of the burnable poison in the fuel, and e is an enrichment wt % of the uranium 235 contained in the fuel assembly; formulating a criterion formula which determines whether a combination of p·n/N and e is feasible as a core or not and is formulated based on the determined fuel data; and determining whether a temporarily set composition of the fuel assembly is approved as a core or not based on the criterion formula.

Abstract: According to an embodiment, a design method for a light-water reactor fuel assembly comprises: accumulating a determined fuel data, showing that each of a combination of p·n/N and e is feasible as the core or not, wherein N is a number of the fuel rods in the fuel assembly, n is a number of the fuel rods containing the burnable poison, p is a ratio wt % of the burnable poison in the fuel, and e is an enrichment wt % of the uranium 235 contained in the fuel assembly; formulating a criterion formula which determines whether a combination of p·n/N and e is feasible as a core or not and is formulated based on the determined fuel data; and determining whether a temporarily set composition of the fuel assembly is approved as a core or not based on the criterion formula.

Abstract: Light water reactor fuel assemblies each comprises: light water reactor fuel rods that extend longitudinally, contain nuclear fuel materials including enriched uranium, and are arranged parallel to each other; and burnable poison containing fuel rods that extend longitudinally, contain nuclear fuel materials whose main component is uranium that is lower in enrichment than the enriched uranium of the light water reactor fuel rods, and burnable poison, and are arranged in a lattice pattern together with the light water reactor fuel rods. The assemblies are arranged parallel to each other and in a lattice pattern. An initial value of a first enrichment of the enriched uranium is set in such a way that the first enrichment of the enriched uranium at an end of each operation cycle is greater than a predetermined value.

Abstract: Provided, in parallel to an electromagnetic pump in a power supply system, is an electromagnetic pump compensation power supply mechanism (10) that will perform a power-factor improving function as a synchronous machine during normal operation of a plant. The electromagnetic pump compensation power supply mechanism (10) is provided with an exciter stator permanent magnetic apparatus (45) that can switch an exciter between a non-excited state and an excited state. The exciter stator permanent magnet apparatus (45) comprises exciter stator permanent magnets (15a), springs (16) that apply force to the exciter stator permanent magnets (15a) towards positions facing an exciter rotor winding (15b), and electromagnetic solenoids (20) that make the exciter stator permanent magnets (15a) move to positions not facing the exciter rotor winding (15b) in resistance to the force applied by the springs (16).

Abstract: Provided, in parallel to an electromagnetic pump in a power supply system, is an electromagnetic pump compensation power supply mechanism (10) that will perform a power-factor improving function as a synchronous machine during normal operation of a plant. The electromagnetic pump compensation power supply mechanism (10) is provided with an exciter stator permanent magnetic apparatus (45) that can switch an exciter between a non-excited state and an excited state. The exciter stator permanent magnet apparatus (45) comprises exciter stator permanent magnets (15a), springs (16) that apply force to the exciter stator permanent magnets (15a) towards positions facing an exciter rotor winding (15b), and electromagnetic solenoids (20) that make the exciter stator permanent magnets (15a) move to positions not facing the exciter rotor winding (15b) in resistance to the force applied by the springs (16).

Abstract: An image forming system including: an image reading portion which reads an image of an original; an image forming portion which forms the image on a sheet based on image information read by the image reading portion; and a storing device which stores the original before the image is read, the original after the image is read, and the sheet on which the image has been formed based on the image information, wherein the storing device is detachable from the image forming system.

Abstract: An image forming system including: an image reading portion which reads an image of an original; an image forming portion which forms the image on a sheet based on image information read by the image reading portion; and a storing device which stores the original before the image is read, the original after the image is read, and the sheet on which the image has been formed based on the image information, wherein the storing device is detachable from the image forming system.

Abstract: A high temperature steam electrolyzing device has: an electrolyzing cell section that includes a hydrogen electrode and an oxygen electrode arranged at mutually opposite sides of a solid oxide electrolyte operating as intermediate layer and electrolyzes steam to generate hydrogen; fixing flanges for fixing end sections of the solid oxide electrolyte of the electrolyzing cell section; a unit support member for supporting the fixing flanges; fitting flanges arranged at mutually opposite surfaces of the fixing flanges and the unit support member; gaskets made of metal or a mineral-based material and interposed between the fixing flanges and the fitting flanges and between the unit support member and the fitting flanges; and fastening members for separably fastening the fitting flanges.

Abstract: An electromagnetic flowmeter designed to use a smaller excitation device and applicable to measurement on tubular channels of various sectional shapes. The electromagnetic flowmeter includes an excitation device for forming a magnetic field perpendicular to an outer wall of a tubular channel, and a pair of electrodes for measuring an electromotive force generated by the movement of the electroconductive fluid across the magnetic field. The electrodes and two magnetic poles of the excitation device are collectively placed on the outer wall at one side of the tubular channel.

Abstract: An object of the present invention is to provide an electromagnetic flowmeter designed to use a smaller excitation device and applicable to measurement on tubular channels of various sectional shapes. The electromagnetic flowmeter 10 includes an excitation device 11 for forming a magnetic field perpendicular to an outer wall 11b of a tubular channel 1, and a pair of electrodes 2a and 2b for measuring an electromotive force generated by the movement of the electroconductive fluid across the magnetic field. The electrodes 2a and 2b and two magnetic poles of the excitation device 11 are collectively placed on the outer wall 1b at one side of the tubular channel 1.

Abstract: A soldering machine includes a solder vessel, an electromagnetic pump, and a nozzle. The solder vessel stores molten solder, and the electromagnetic pump moves the solder by generating electromagnetic force. The electromagnetic pump is submerged below the liquid surface of the solder. The nozzle ejects the solder in the solder vessel onto an object, such as a printed circuit board. Accordingly, the generated heat from the electromagnetic pump is conducted to the solder in the solder vessel, and the solder can be heated to a higher temperature than in the conventional soldering machine.

Abstract: A soldering machine includes a solder vessel, an electromagnetic pump, and a nozzle. The solder vessel stores molten solder, and the electromagnetic pump moves the solder by generating electromagnetic force. The electromagnetic pump is submerged below the liquid surface of the solder. The nozzle ejects the solder in the solder vessel onto an object, such as a printed circuit board. Accordingly, the generated heat from the electromagnetic pump is conducted to the solder in the solder vessel, and the solder can be heated to a higher temperature than in the conventional soldering machine.

Abstract: A soldering machine includes a solder vessel, an electromagnetic pump, and a nozzle. The solder vessel stores molten solder, and the electromagnetic pump moves the solder by generating electromagnetic force. The electromagnetic pump is submerged below the liquid surface of the solder. The nozzle ejects the solder in the solder vessel onto an object, such as a printed circuit board. Accordingly, the generated heat from the electromagnetic pump is conducted to the solder in the solder vessel, and the solder can be heated to a higher temperature than in the conventional soldering machine.