Noritaka Yusa
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View article: Probabilistic detection assessment based on one-dimensional signal distribution in eddy current testing under low signal-to-noise ratio
Probabilistic detection assessment based on one-dimensional signal distribution in eddy current testing under low signal-to-noise ratio Open
View article: The applicability of high-frequency ultrasonic testing for the inspection of the bonded interface between a divertor's mono-block and screw pipe
The applicability of high-frequency ultrasonic testing for the inspection of the bonded interface between a divertor's mono-block and screw pipe Open
View article: Numerical prediction of the heat transfer properties of Flinabe molten salt as a coolant in a nuclear system
Numerical prediction of the heat transfer properties of Flinabe molten salt as a coolant in a nuclear system Open
In this study, we evaluated the dependence of the heat transfer properties of a molten salt mixture (LiF–NaF–BeF2—Flinabe) on its composition ratio to determine its applicability as a coolant in a nuclear system. Specifically, we evaluated…
View article: Signal-Distribution-Based Crack Detection for Divertor Monoblock Inspection Using Eddy Current Testing
Signal-Distribution-Based Crack Detection for Divertor Monoblock Inspection Using Eddy Current Testing Open
View article: The Effect of the Grain Size of Divertor’s Cooling Pipe on the Capability of High-Frequency Ultrasonic Tests to Evaluate the Quality of the Bond between Divertor’s Cooling Pipe and Armor
The Effect of the Grain Size of Divertor’s Cooling Pipe on the Capability of High-Frequency Ultrasonic Tests to Evaluate the Quality of the Bond between Divertor’s Cooling Pipe and Armor Open
This study evaluated the effect of the grain size of the divertor's cooling pipe on the capability of high-frequency ultrasonic tests to evaluate the quality of the bonded interface between the divertor's cooling pipe and armor. First, sim…
View article: Board Game Design to Understand the National Power Mix
Board Game Design to Understand the National Power Mix Open
This study reports a board game design that would be an effective tool for teaching and learning the best mix of national power sources in a class concerning energy and sustainability in higher education courses. A board game was developed…
View article: Reliability Analysis of Pipe Wall Thinning based on Quantification of Ultrasonic Testing
Reliability Analysis of Pipe Wall Thinning based on Quantification of Ultrasonic Testing Open
Piping in nuclear power plants is subject to corrosion and erosion caused by the interaction with fluids it carries. In order to prevent accidents such as pipe rupture, it is necessary to non-destructively inspect the thickness of the pipe…
View article: Design of a simple side-incident TE<sub>11</sub> mode microwave probe for nondestructive pipe inspection
Design of a simple side-incident TE<sub>11</sub> mode microwave probe for nondestructive pipe inspection Open
This study proposed a simple side-incident TE 11 mode microwave probe for the rapid and long-range inspection of cracks in metallic pipes. The probe feeds the microwaves to a metallic pipe, which works as a waveguide; the reflection signal…
View article: Numerical Prediction of Heat Transfer Properties of Molten Salt Flinabe for a Coolant in a Nuclear System
Numerical Prediction of Heat Transfer Properties of Molten Salt Flinabe for a Coolant in a Nuclear System Open
View article: Development of signal processing method to measure wall thickness of corrosion specimens by electromagnetic acoustic resonance method
Development of signal processing method to measure wall thickness of corrosion specimens by electromagnetic acoustic resonance method Open
Electromagnetic acoustic resonance method (EMAR) is promising for online monitoring of pipes wall thinning with corrosion during operation. However, the improvement of measurement accuracy is one of issues to be solved, although some signa…
View article: Probe Design for the Eddy Current Inspection of Cooling Tubes in the Blanket of a Fusion DEMO Reactor
Probe Design for the Eddy Current Inspection of Cooling Tubes in the Blanket of a Fusion DEMO Reactor Open
This study investigated the applicability of eddy current testing (ECT) to the non-destructive inspection of cooling tubes in the blanket of a fusion DEMO reactor. Pipes made of F82H steel with inner and outer diameters of 9.0 and 11.0 mm,…
View article: Application of High-Frequency Ultrasonic Test to the Non-Destructive Inspection of W-Cu Bonded Interface
Application of High-Frequency Ultrasonic Test to the Non-Destructive Inspection of W-Cu Bonded Interface Open
This study evaluated the applicability of high-frequency ultrasonic tests to the non-destructive inspection of the bonded interface between a cooling pipe and a divertor monoblock. Samples prepared in this study were an ITER-grade tungsten…
View article: Whether “Rich in Frequency” Means “Rich in Information” in Pulsed Eddy Current Testing to Evaluate Plate Thickness: Numerical Investigation
Whether “Rich in Frequency” Means “Rich in Information” in Pulsed Eddy Current Testing to Evaluate Plate Thickness: Numerical Investigation Open
This study investigated whether it is really reasonable to insist that being "rich in frequency" represents an advantage of pulsed eddy current testing when compared with conventional eddy current testing. More specifically, this study com…
View article: An Eddy Current Method to Evaluate Local Wall Thinning of Carbon Steel Pipe
An Eddy Current Method to Evaluate Local Wall Thinning of Carbon Steel Pipe Open
This paper proposes to evaluate the local wall thinning of carbon steel pipe using an eddy current method. Firstly, the feature signals are determined by correlation analysis of the signals and the wall thinning sizes. Subsequently, the mo…
View article: Investigation for Contact Interface of Mechanical Lap Joint Fabricated with High-Temperature Superconducting Conductor Using X-Ray Microtomography
Investigation for Contact Interface of Mechanical Lap Joint Fabricated with High-Temperature Superconducting Conductor Using X-Ray Microtomography Open
Joint winding of high-temperature superconducting (HTS) helical coil with conductor segments that are connected using bridge-type mechanical lap joints is considered as a promising method of fabricating magnet for a FFHR heliotron-type fus…
View article: Probabilistic analysis of electromagnetic acoustic resonance signals for the detection of pipe wall thinning
Probabilistic analysis of electromagnetic acoustic resonance signals for the detection of pipe wall thinning Open
This study proposes a probability of detection (POD) model for the probabilistic analysis of the detectability of electromagnetic acoustic resonance (EMAR) method for the detection and evaluation of pipe wall thinning. Forty-one carbon ste…
View article: Low Frequency Electromagnetic Testing for Evaluating Wall Thinning in Carbon Steel Pipe
Low Frequency Electromagnetic Testing for Evaluating Wall Thinning in Carbon Steel Pipe Open
This study proposes an inverse algorithm to evaluate the depth of full circumferential wall thinning from low-frequency electromagnetic field signals. Finite element simulations were performed and revealed that normalizing the magnetic fie…
View article: Development of long-range inspection using TE mode microwaves for detecting axial cracks
Development of long-range inspection using TE mode microwaves for detecting axial cracks Open
This study proposes nondestructive long-range inspection for axial cracks appearing at the inner surface of a metal pipe using microwave. Numerical simulations were conducted to design a mode converter that converts TEM into TE mode that i…
View article: Making Research Paper
Making Research Paper Open
This study proposes to introduce a fusion reactor with an MA transmutation system into the nuclear fuel cycle. In this study, the effects of the coolants (molten salts, liquid metal, water, He gas) on the MA transmutation were evaluated. N…
View article: Development of a nondestructive testing method using low-frequency electromagnetic fields for the detection of corrosion at the bottom of double-tank in a reprocessing plant
Development of a nondestructive testing method using low-frequency electromagnetic fields for the detection of corrosion at the bottom of double-tank in a reprocessing plant Open
This study proposes a low-frequency eddy current testing method, using an exciter coil with a large diameter attached at the bottom of the tank, to inspect a double-walled tank in a reprocessing plant. Finite element simulations were perfo…
View article: Probability of detection model for the non-destructive inspection of steam generator tubes of PWRs
Probability of detection model for the non-destructive inspection of steam generator tubes of PWRs Open
This study proposes a probability of detection (POD) model to discuss the capability of non-destructive testing methods for the detection of stress corrosion cracks appearing in the steam generator tubes of pressurized water reactors. Thre…
View article: Long-Range Inspection of a Pipe Using a Microwave Emitted by a Probe Attached to the Pipe Wall
Long-Range Inspection of a Pipe Using a Microwave Emitted by a Probe Attached to the Pipe Wall Open
This study proposes long-range nondestructive inspection of the inner surface of a pipe without open end using microwave emitted by a probe attached to the pipe wall. Three-dimensional finite element simulations were conducted to evaluate …
View article: Demonstration of the Applicability of Nondestructive Microwave Testing to the Long-Range Inspection of Inner-Surface Cracks in Tubes
Demonstration of the Applicability of Nondestructive Microwave Testing to the Long-Range Inspection of Inner-Surface Cracks in Tubes Open
This study evaluated the applicability of nondestructive microwave testing method for the long-range detection of inner-surface cracks in metallic tubes. Two seamless straight tubes 7 m in length and 23.0 mm in inner diameter were prepared…
View article: Fabrication of imitative cracks by 3D printing for electromagnetic nondestructive testing and evaluations
Fabrication of imitative cracks by 3D printing for electromagnetic nondestructive testing and evaluations Open
This study demonstrates that 3D printing technology offers a simple, easy, and cost-effective method to fabricate artificial flaws simulating real cracks from the viewpoint of eddy current testing. The method does not attempt to produce a …
View article: Evaluation of probability of detection (POD) studies with multiple explanatory variables
Evaluation of probability of detection (POD) studies with multiple explanatory variables Open
This study proposes a new method to evaluate a probability of detection (POD) as a function of more than one flaw parameter. The main idea of the method is to assume that signals due to flaws described with a given parameter x→ have a norm…
View article: A214 Evaluation of Applicability of Extremely Low Frequency Eddy Current Testing for Monitoring Pipe Wall Thinning
A214 Evaluation of Applicability of Extremely Low Frequency Eddy Current Testing for Monitoring Pipe Wall Thinning Open
This paper evaluates the applicability of the extremely low frequency eddy current testing to the monitoring of wall thinning appearing on the inner surface of pipes. Magneto-Impedance sensor arrays are used to detect signals due to wall t…