Nuclear Fuel Industries

www.nfi.co.jp/e/
Osaka, Japan

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Patent
Nuclear Fuel Industries | Date: 2017-06-07

This invention provides a method and device for nondestructive testing of an anchor bolt. Said method and device make it possible to quantitatively test the soundness of an anchor bolt affixed to a foundation via an adhesive anchor. In this method for nondestructive testing of an anchor bolt, in which the soundness of an anchor bolt affixed to a foundation via an adhesive anchor is tested, a section of the anchor bolt that is exposed from the surface of the foundation is hit so as to produce an impact noise, a signal waveform corresponding to said impact noise is received and subjected to frequency analysis so as to obtain frequency information for said signal waveform, and the soundness of the anchor bolt is nondestructively, quantitatively tested on the basis of said frequency information.


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.


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.


This invention provides a method and device for nondestructive testing of an anchor bolt. Said method and device make it possible to quantitatively test the soundness of an anchor bolt affixed to a foundation via an adhesive anchor. In this method for nondestructive testing of an anchor bolt, in which the soundness of an anchor bolt affixed to a foundation via an adhesive anchor is tested, a section of the anchor bolt that is exposed from the surface of the foundation is hit so as to produce an impact noise, a signal waveform corresponding to said impact noise is received and subjected to frequency analysis so as to obtain frequency information for said signal waveform, and the soundness of the anchor bolt is nondestructively, quantitatively tested on the basis of said frequency information.


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: 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.


[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.

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