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The purpose of the present invention is to provide a nondestructive inspection method and nondestructive inspection device for an anchor bolt capable of quantitatively inspecting the health of an anchor bolt fixed to a foundation by a metallic anchor. Provided is a nondestructive anchor-bolt inspection method for inspecting the health of an anchor bolt fixed to a foundation by a metallic anchor, wherein a striking sound is produced through the striking of a portion of the anchor bolt exposed from the surface of the foundation, frequency information is obtained through the reception and frequency analysis of the signal waveform of the striking sound, and the health of the anchor bolt is nondestructively and quantitatively inspected on the basis of the frequency information for the signal waveform. Also provided is a nondestructive inspection device for an anchor bolt.


Patent
University of Tokyo and Nuclear Fuel Industries | Date: 2013-06-07

Provided is a material diagnostic method capable measuring and diagnosing in a nondestructive manner the type, quantity of occurrence, depth distribution, and the like of even very small microstructures of about several tens of m or less with sufficiently good precision. A material diagnostic method for using ultrasonic waves in a nondestructive manner to diagnose microstructures generated in a material, wherein changes in the scattering of ultrasonic waves by crystal grains are captured from bottom face waves and backscattered waves to thereby quantify the amount of change in microstructures, using the fact that changes in the properties of crystal grains produced by microstructures affect the scattering of ultrasonic waves.


Patent
Nuclear Fuel Industries | Date: 2015-06-24

In a method for setting equivalent fissile coefficients used in determining a Pu enrichment corresponding to a Pu isotopic composition to be applied in targeting an MOX fuel assembly as a manufacture object, the method comprises the steps of: selecting multiple Pu isotopic compositions that cover a range of the Pu isotopic compositions to be applied thereto up to a number larger than the total number of the equivalent fissile coefficients; determining an enrichment distribution of each MOX fuel rod that becomes equivalent in arbitrary characteristic to the base design for each of the selected Pu isotopic compositions; and obtaining the equivalent fissile coefficients by calculating an equation obtained by applying a least squares method to an equivalent fissile method using an average Pu enrichment of the MOX fuel rods based on the enrichment distribution and data based on a weight ratio that each isotope occupies in uranium or Pu in each Pu isotopic composition; therefore, it is possible to provide a method capable for setting equivalent fissile coefficients for more efficient design and manufacture of the MOX fuel assembly with a higher accuracy than before.


Patent
Nuclear Fuel Industries | Date: 2011-11-30

This invention provides a device for supplying a feedstock liquid comprising a light irradiator for irradiating with light drops of a feedstock liquid that includes uranyl nitrate, the drops being dripped from a dripping nozzle device wherein the dripping nozzle device comprises dripping nozzles and the drops are dripped from each of the dripping nozzles; and flow regulators, each of which controls an amount of the feedstock liquid to be supplied to each dripping nozzle from a feedstock liquid reservoir in which the feedstock liquid is stored, depending on conditions of the falling of the drops irradiated with the light.


Patent
Nuclear Fuel Industries | Date: 2013-10-09

Disclosed is a debris filter capable of reducing a pressure loss of coolant as it flows and capturing debris in the coolant. The debris filter includes bent plates, first plates, and second plates, all having respective same shapes, wherein each of the bent plates is composed of a first inclined strip-like plate and a second inclined strip-like plate. The bent plates are arranged parallel with each other, the bent plates and the first plates are fixed with each other so that the first plates intersect each first inclined plate, the bent plates and the secondplates are fixed with each other so that the secondplates intersect each second inclined plate, and the first plates does not touch the second plates.


Patent
Nuclear Fuel Industries and University of Tokyo | Date: 2015-04-15

Provided is a material diagnostic method capable measuring and diagnosing in a nondestructive manner the type, quantity of occurrence, depth distribution, and the like of even very small microstructures of about several tens of mum or less with sufficiently good precision. A material diagnostic method for using ultrasonic waves in a nondestructive manner to diagnose microstructures generated in a material, wherein changes in the scattering of ultrasonic waves by crystal grains are captured from bottom face waves and backscattered waves to thereby quantify the amount of change in microstructures, using the fact that changes in the properties of crystal grains produced by microstructures affect the scattering of ultrasonic waves.


Patent
Nuclear Fuel Industries | Date: 2011-11-30

This invention provides a device for solidifying the surfaces of drops, comprising an ammonia gas sprayer with ammonia gas-spraying nozzles, each spraying ammonia gas to each of paths along which drops of the feedstock liquid that includes uranyl nitrate fall to an aqueous ammonia solution stored in an aqueous ammonia solution reservoir, the drops being dripped from a dripping nozzle device wherein the dripping nozzle device comprises nozzles and the drops are dripped from the nozzles, and wherein the distance between the ends of the dripping nozzles and the ends of the ammonia gas spraying nozzles is from 10 mm to 40 mm, the shortest distance between the paths along which the drops dripped from the ends of the dripping nozzles fall and the ends of the ammonia gas spraying nozzles is from 3 mm to 15 mm, and the flow rate of the ammonia gas sprayed from the ammonia gas spraying nozzles is from 3 L/min to 25 L/min.


[PROBLEMS] To provide an apparatus for manufacturing high quality coated fuel particles by optimizing the design of gas inlet channels (4a-c) and nozzle openings (5a-c) 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 (1) at the bottom of the vessel for forming a multilayered coating on each of the surfaces of UO_(2) fuel kernels by introducing a coating material mixed gas containing a coating gas and a fluidizing gas from the gas inlet nozzle (1) to the interior thereof under a heated environment while the fuel kernels are fluidized. The gas inlet nozzle (1) comprises a dish-shaped nozzle body (2) fitted into the bottom of the reaction vessel to constitute at least a part of the bottom centre part of the vessel, a plurality of nozzle openings (5a-c) disposed on the nozzle body (2) at positions allocated along a plurality of circular zones (B,C) which are concentric with each other around the centre axis (A) of said bottom of the reaction vessel, one or more gas inlet channels (4a-c) passing through the nozzle body (2) and communicating with the nozzle openings (5a-c) from the bottom surface side of the vessel, and one or more gas inlet pipes communicating with the one or more gas inlet (3) channels and supplying the coating material mixed gas to the channels (4a-c) from a gas feed system disposed on the outside of the reaction vessel.


[PROBLEMS] To provide an apparatus for manufacturing high quality coated fuel particles by optimizing the design of gas inlet channels (4a-c) and nozzle openings (5a-c) 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 (1) at the bottom of the vessel for forming a multilayered coating on each of the surfaces of UO_(2) fuel kernels by introducing a coating material mixed gas containing a coating gas and a fluidizing gas from the gas inlet nozzle (1) to the interior thereof under a heated environment while the fuel kernels are fluidized. The gas inlet nozzle (1) comprises a dish-shaped nozzle body (2) fitted into the bottom of the reaction vessel to constitute at least a part of the bottom centre part of the vessel, a plurality of nozzle openings (5a-c) disposed on the nozzle body (2) at positions allocated along a plurality of circular zones (B,C) which are concentric with each other around the centre axis (A) of said bottom of the reaction vessel, one or more gas inlet channels (4a-c) passing through the nozzle body (2) and communicating with the nozzle openings (5a-c) from the bottom surface side of the vessel, and one or more gas inlet pipes communicating with the one or more gas inlet (3) channels and supplying the coating material mixed gas to the channels (4a-c) from a gas feed system disposed on the outside of the reaction vessel.


Patent
Nuclear Fuel Industries | Date: 2011-11-25

Disclosed is a debris filter capable of reducing a pressure loss of coolant as it flows and capturing debris in the coolant. The debris filter includes bent plates, first plates, and second plates, all having respective same shapes, wherein each of the bent plates is composed of a first inclined strip-like plate and a second inclined strip-like plate. The bent plates are arranged parallel with each other, the bent plates and the first plates are fixed with each other so that the first plates intersect each first inclined plate, the bent plates and the second plates are fixed with each other so that the second plates intersect each second inclined plate, and the first plates does not touch the second plates.

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