In this paper, inspection of the wall thinning in pipes with microwave is studied. Experimental v erifications are carried out to demonstrate that the response of microwave, time of flight, enabl es one to locate wall thinning. One of the advantages of this method is that whole pipe is evaluat ed at once Values of time of flight obtained by the experiments agree well with theoretical ones....
英字タイトル:
The basic study of microwave testing for locating wall thinning in pipes

Abstract: This study reports the development of a new microwave probe for the nondestructive testing of a pipe. Three-dimensional finite element simulations are carried out to optimize the profile of a microwave probe, whose results show that a probe with elliptic profile enables smaller reflection at the probes as well as much better single-mode propagation inside the pipe than conventional ones. Experimental validations are carried out using a straight brass pipe with an inner diameter of 39 mm and...
英字タイトル:
Enhancement of microwave nondestructive testing method for the inspection of pipes by optimizing the microwave probe profile

This study conducted a survey to gather information on the knowledge of Laotian high school students on nuclear energy. This study prepared an original 11-pages textbook that briefly introduced nuclear energy and related matters in Lao. One hundred high school students belonging to a public high school with a good reputation in Savannakhet Province were requested to read the textbook approximately in a half day to tell subjective impression on the amount of prior knowledge on the contents of each sect...
英字タイトル:
Survey on the Knowledge of Laotian High School Students on Nuclear Energy

Electromagnetic acoustic resonance (EMAR) method is useful for measuring thickness of pipe. But in the case of thickness changing complicatedly in part of pipe wall thinning for various factor, accurate thickness measurement is difficult. In this study, thickness of specimens of pipe corroded under various conditions is evaluated by EMAR. The error of thickness evaluation is investigated in view of maximum value of spectrum and roughness and curvature of pipe. As a result, it is suggested that signal streng...
英字タイトル:
Evaluation of pipe wall thinning with electromagnetic acoustic resonance method considering effects of roughness and curvature of inner surface.

This study proposes a method to fabricate an artificial defect that is almost identical to stress corrosion cracking from the viewpoint of electromagnetic nondestructive evaluations. The key idea is to realize a region having electrical resistance embedded inside a conductive materials using solid state bonding. A rough region is introduced into the surface of the materials to be bonded so that the region is partially bonded to realize electrical resistance. Experimental demonstrations are carried out...
英字タイトル:
Fabrication of imitative stress corrosion cracking specimens suitable for electromagnetic nondestructive evaluations using solid state bonding

This study proposes a method to fabricate artificial defects that is almost identical to stress corrosion cracking from the viewpoint of electromagnetic nondestructive evalua tions. The key idea is to realize a region having electrical resistance embedded inside a conductive materials using solid state bonding. A rough region is introduced into th e surface of the materials so that the region is partially bonded to realize electrical resistance The validity of the method is demonstrated using type 316L aus...
英字タイトル:
Fabrication of imitative stress corrosion cracking specimens suitable for electromagnetic nondestructive evaluations using solid state bonding

This study reports the results of questionnaire survey to evaluate the attitudes of Laotian students towards energy. The survey was conducted at four high schools in three cities, including Vientiane capital, in Lao PDR in 2017, and also at the Faculty of Engineering, National University of Laos, in 2015-2017. The results of the survey were compared with earlier publications reporting the results of similar surveys targeting Japanese university students. The results revealed that Laotian students plac...
英字タイトル:
Questionnaire survey of the attitude of Laotian students aiming at the discussion on the factors affecting the public attitudes toward energy

This study performed finite element simulations to evaluate the applicability of a low-frequency eddy current nondestructive testing method for the detection of corrosions appearing in a double tank used in a reprocessing plant using a large diameter coil attached to the bottom of the tank. The simulations modeled the tank as an axisymmetric one, and evaluated the effect of various parameters such as frequency, coil radius and the gap between the inner and the outer vessels. The results of the simulations c...
英字タイトル:
Finite Element Evaluation of the Low Frequency Electromagnetic Method using a Large Exciter Coil for Monitoring the Corrosion of Double Tank in a Reprocessing Plant

This study investigated the influence of probe types on the detection capability of eddy current testing technique against the flaws on F82H steel. Three surface slits were fabricated in F82H specimens with a thickness of 10 mm. The slit depth is 0.5, 1, and 3 mm. The slits were detected by pancake probe, vertical pancake probe, uniform probe, and plus point probe. The signal to noise ratio of used probes was calculated and compared. The greatest signal to noise ratio was plus point probe, followed in order...
英字タイトル:
Influence of probe types on detection capability of eddy current testing to blanket cooling tube of fusion prototype reactor

This paper evaluates the applicability of eddy current inversion techniques to the sizing of defects in Inconel welds with rough surfaces. For this purpose, a plate Inconel weld specimen, which models the welding of a stub tube in a boiling water nuclear reactor, is fabricated, and artificial notches machined into the specimen. Eddy current inspections using six probes in weld inspection evaluated. It is revealed that if suitable probes are applied, an Inconel weld does not provide large noise signals in ed...
英字タイトル:
Applicability of eddy current inversion techniques to the sizing of defects in Inconel welds of BWR internals