Inspections eddy current testing

The war itself also drove the development of improved and miniaturised electronic components for creating oscillators and amplifiers and, ultimately, semiconductors, which made practical the electronic systems needed in portable eddy current test instruments. The refinement of those systems continues to the present day and advances continue to be triggered by performance improvements of components and systems. In the same way that today s pocket calculator outperforms the large, hot room full of intercormected thermionic valves that I first saw in the 50 s, so it is with eddy current instrumentation. Today s handheld eddy current inspection instrument is a powerful tool which has the capability needed in a crack detector, corrosion detector, metal sorter, conductivity meter, coating thickness meter and so on. 

Identification. Incomplete fusion generally results in discontinuities along the side walls of a joint. When these discontinuities emerge at surfaces, they can be observed visually if accessible (Figs. 15.10 and 15.11). Defects of this type may also be detected by ultrasonics, radiography, magnetic particle inspection, and eddy-current testing. 

Limited at first to the inspection of metallic components, it was later demonstrated that high-frequency magnetic fields causing eddy current production could be applied to the testing of composites containing conductive fibers, or a certain amount of graphite [108.109], Eddy current testing has been successfully applied in the detection and characterization of defects in carbon fiber reinforced plastics (CFRP) panels, helicopter rotor blades, truck tires, and more [110-112]. 

At the tubesheet elevation, two 8 handholes are included to provide access for tubesheet sludge lancing as well as for inspection of the downcomer annulus. These handholes can be used to remotely inspect for, and retrieve, loose parts. Access for eddy current testing is through the primary-side manways. 

Regular inspections of rod cluster control assemblies (RCCAs) are performed during refueling periods by visual examination, eddy current testing and diameter profilometry. Generally, all RCCAs will be inspected within four years period. 

One Spanish PWR, Almaraz-2, has experienced this problem, where visual inspections with baroscope as well as dimensional and corrosion inspections based on eddy current tests and bouldering have been carried out. 

The use of InconeI-600 alloy in German NPPs is very limited compared to other NPPs. Inconel-600 for vessel head penetration nozzles is only used in two German PWRs. The peripherical nozzles were inspected by eddy current tests and no cracks were found. This is explained with different geometric... 

Inspections are performed using the eddy-current testing, which was based on the electromagnetic... 

In order to reduce the occurrence of rail-defect-related failures, various methods are used to detect rail defects. These methods include visual inspection by the track maintenance staff, ultrasonic defect detection, eddy-current testing, ground-penetrating radar, impedance spectroscopy, and electromagnetic acoustic transducers [16,17]. 

Nondestructive examination techniques (ultrasonic testing (UT) and eddy current testing (ET)) shall be used to demonistrate that the reactor tank and the PWS piping will maintain their integrity under the operating conditions. The restart criteria for the reactor tank, based on the UT inspection, will be in accordance with WSRC-RP-89-208, "Tank UT Acceptance Criteria" (Reference 1). 

In addition to the review of general system integrity of the SRS reactors by various review panels, detailed aspects of the UT procedures, inspection work, and examination data have also been reviewed by independent NDE experts. Two recognized experts in the field of nuclear vessel NDE provided independent oversight and conducted random observations of the activities of the UT operation. Both UT and eddy current testing (ET) methods were used for ISI of... 

NDT inspection in the thin-skin regime is well adapted to finding the length of a surface slot or crack from eddy current data. With the electromagnetic skin depth smaller than the slot depth, the interaction between the eddy current induced in the test block and tbe slot is strong at the surface of the block. 

Radiographic inspection is considered as a legal alternative for pressure testing of petrochemical installations. It has the major advantage that it does not require shutdown of the installation. Other NDT techniques such as ultra-sound or eddy-current may be used alternatively or complementary. 

The non destructive department of Laborelec is mainly involved with problems concerning nuclear, thermal and combined cycle power stations. Our inspections are based on eddy current and ultrasonic testing. 

The Dow Freeport in-service inspection procedures are similar to those reported earlier in this chapter. The Dow out-of-service (internal) inspection includes ultrasonic thickness measurements at all benchmark locations. Other test methods include shear wave ultrasonics, eddy current, and radiography. Engineers use ultrasonic thickness readings to project the remaining useful life of the vessel and to determine when the next internal inspection should be scheduled. 

To ensure consistently high quality, the company conducts thorough testing and inspection, using advanced equipment including eddy current, ultrasonic and magna flux devices. 

Eddy current inspection is typically performed in metallic components for cracks or thickness inspections. The method uses a changing magnetic field to create eddy currents in the substrate under test. Those eddy currents create a secondary field back in the eddy current coil. Changes in the substrate that affect the eddy current flow will alter the secondary electromagnetic fields and therefore affect the originating coil... 

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