This paper deals with a recovery method of a crack shape for preventive maintenance of power plant. In order to detect a crack and recover of its shap e automatically, we develop a mobile robot with ECT (Eddy Current Testing) sensor composed of a transmitter-receiver coil probe. ECT is a major techn ique for detection of surface and subsurface cracks found out in structures of the power plant. The robot detects a crack by ECT sensor signals, local izes the crack and recover its shape by rough and fine insp...
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Development of Crack Shape Inspection System with ECT Sensor Robot

BWR owners and plant fabricators have been making efforts to decrease the ISI parts where UT is difficult to be conducted. For that purpose, UT verification test for both detection and sizing qualification through deposit of pipe weld joint started in 2009 and will last until 2011. In 2009, UT verification test for stainless steel pipe weld joint has been performed. Test samples are stainless steel pipes with welds and sizes are 600A.350A.150A with EDM notches and/or SCC cracks. Angle beam methods and...
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Result of UT verification test for Stainless Steel through weld deposit

BWR owners and plant fabricators have been making efforts to decrease the ISI parts where UT is difficult to be cond ucted. For that purpose, UT verification test for both detection and sizing qualification through deposit of pipe wel d joint started in 2009 and will last until 2011. In 2009, UT verification test for stainless steel pipe weld joint has been performed. Test samples are stainless steel pipes with welds and sizes are 600A.350A.150A with EDM notches a nd/or SCCs. Angle beam methods and phased...
英字タイトル:
Result of UT verification test for Stainless Steel through weld deposit

This paper deals with an ECT diagnosis system using network communication. This system consists of an inspection module, a computational m odule and a communication interface module which can visualize some inspection results from the inspection module with ECT and some analys is results from the computation module. Here, three modules are connected through network architecture and communicated each other. Moreov er, an operator can control interactively the inspection and computational modules in order to...
英字タイトル:
Development of ECT Diagnosis System with Network Communication

New technique has been examined for polyethylene r od. This technique has been observed microwave die lectric absorption in polymeric material. The reso nance frequency has a peak at about 200kGy at 300K...
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Evaluation of Polymeric Materials Aged Deterioration by MicrowaveDielectric Absorption Technique

We verified that the eddy current testing (ECT) has the enough detectability for defects on the heat affected zone (HAZ) in welding of in-core monitor (ICM) housing inner surfaces for a special inspection involved in long-term operation. It is presumed that a detectability of ECT is decreased because a HAZ of ICM housing inner surfaces is deformed by welding. We conducted full-scale defect detection tests using the simulated ICM housing specimen with the welded part, the rotational ECT probe and the probe m...
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Verification of Eddy Current Testing for In-Core Monitor Housing

This study deals with a crack detection method with a mobile robot for preventive maintenance of power plant. Eddy current testing (ECT) is a major technique for detection of c racks found out in structures of the power plant. In this paper, we develop a mobile robot with ECT sensor composed of a transmitter-receiver coil probe. The robot detects a cr ack by ECT sensor signals and localizes the crack by the position of the robot. Then, the robot traces the crack and reconstructs the shape of the crack. By ...
英字タイトル:
Development of Mobile Inspection Robot in Eddy Current Testing

The guideline committee for the inspection and evaluation of Reactor Vessel Internals of JANSI (Japan Nuclear Safety Institute) has been developing many guidelines based on principle which the conservative methodology, and covered both individual inspection method of reactor internals and application of repair methods for reactor internals. In this paper, some aspects of the JANSI-VIP-21 (Guidelines for the inspection and evaluation of Reactor Vessel Internals, revised Mar.2017) which is summary document o...
英字タイトル:
Outlines of Guidelines for the Inspection and Evaluation of Reactor Vessel Internals

“The guideline committee for the inspection and evaluation of Reactor Vessel Internals” of JANSI (Japan Nuclear Safety Institute) has been developing many guidelines based on principle which the conservative methodology, and covered both individual inspection method of reactor internals and application of repair methods for reactor internals. In this paper, some aspects of the JANSI-VIP-03 (Guidelines for the inspection and evaluation of Reactor Vessel Internals, revised Dec.2013) which is summary docu...
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Outlines of Guidelines for the Inspection and Evaluation of Reactor Vessel Internals

Recently, the number of aged traffic structures is increasing in Japan. Most of them require constant maintenance to prevent an accident. Kobe city has a lot of aged illumination pillars and had two fall accidents, unfortunately. To detect an illumination pillar with a defect quickly, we apply a guided wave excited by electromagnetic acoustic transducers to a nondestructive testing system. This method has the potential for low-cost and efficient testing. When testing buried illumination pillars, it is neces...
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Attenuation of Guided Wave by Buried Part on Nondestructive Testing of Illumination Pillar