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...
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Survey on the Knowledge of Laotian High School Students on Nuclear Energy

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...
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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...
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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...
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Questionnaire survey of the attitude of Laotian students aiming at the discussion on the factors affecting the public attitudes toward energy

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...
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Applicability of eddy current inversion techniques to the sizing of defects in Inconel welds of BWR internals

This study evaluates stress corrosion cracks appearing in austenitic sta inless steel from the viewpoint of its resistance to eddy currents. Edd y current signals due to artificially introduced stress corrosion cracks are analyzed using finite element simulators to discuss its resistance . The results showed that the width and conductivity to model a stress corrosion crack vary significantly and furthermore depend on exciting f requency adopted. In contrast, however, the resistance of a crack, which is de...
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Discussion on the Minimum Resistance of Stress Corrosion Cracking From the Viewpoint of EddyCurrent Nondestructive Evaluation

Abstract: This study evaluates the applicability of eddy current testing to the detection and sizing of fatigue cracks embedded in Inconel weld overlay. Welded plate specimens, which model head penetration welds and their weld overlay, are fabricated, and fatigue cracks are artificially introduced into the specimens. Eddy current inspections are performed using a uniform eddy current probe driven with 10 kH z, and all of the fatigue cracks are detected with clear signals. Subsequent numerical inversions ...
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Detection of embedded fatigue cracks in weld overlay and evaluation of minimum thickness of the weld by means of eddy current testing

Abstract. This study discusses a suitable numerical modeling of a thermal fatigue crack from the viewpoint of eddy current testing. Five artificial thermal fatigue cracks, introduced into type 304L austenitic stainless steel plates with a thickness of 25 mm, are prepared; and eddy current inspections are carried out to gather signals using an absolute type pancake probe and a differential type plus point probe. Finite element simulations are then carried out to evaluate a proper numerical model of the...
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Numerical modeling of thermal fatigue cracks from the viewpoint of eddy current testing

This study discusses the stress corrosion cracking (SCC) model which improves accuracy of depth sizing of SCCs with eddy current testing (ECT). For this purpose, the factors that influence ECT for SCCs are evaluated. In this study, the crack morpholog y and oxide fillings in SCCs are evaluated. As a first step, SCCs introduced at room temperature and fatigue cracks with oxide fillings are evaluated. To discuss the EC signals of SCCs, SCCs are artificially introduced and their ECT signals are obtain ed. The...
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Evaluation of the influence of crack branching structure and oxide fillings of stress corrosion cracking for depth sizing based on eddy current testing

study evaluates the probability of the errors in evaluation of length and depth of ly current testing signals measured in inspections of a steam g enerator tubes in lants. Numerous numerical simulations are performed to establish database e number of defect profiles and corresponding eddy cur rent signals; then the or is calculated as a function of the difference in signals using the databases. is study clarify that the eddy current inv ersion in the configuration is not so Abstract This study evaluates t...
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Probabilistic Evaluation of Eddy Current Inverse Analyses