Evaluation of the eddy-current method for the inspection of steam generator tubingdenting
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Dept. of Energy, Brookhaven National Laboratory, Dept. of Nuclear Energy, Corrosion Group, for sale by the National Technical Information Service , Upton, N.Y, Springfield, Va
Eddy currents (Electric), Steam-boilers -- Corr
|Statement||S.D. Brown and J.H. Flora, Battelle Columbus Laboratories|
|Series||BNL-NUREG ; 50743|
|Contributions||Flora, J. H., joint author, U.S. Nuclear Regulatory Commission. Division of Engineering Standards, Battelle Memorial Institute. Columbus Laboratories, Brookhaven National Laboratory. Dept. of Nuclear Energy. Corrosion Science Group|
|The Physical Object|
|Pagination||viii, 39 :|
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Evaluation of the eddy-current method for the inspection of steam generator tubing: denting. [PWR]. Evaluation of th eddy-current method for the inspection of steam generator tubing: denting Author: S D Brown ; J H Flora ; U.S.
Nuclear Regulatory Commission. The objective of the Improved Eddy-Current ISI for Steam Generator Tubing program is to upgrade and validate eddy-current inspections, including probes, instrumentation, and data processing techniques for inservice inspection of new, used, and repaired steam generator tubes; to improve defect detection, classification, and characterization as affected by diameter and thickness variations, denting, probe wobble, tube sheet, tube supports, copper and sludge deposits Author: C.V.
Dodd, J.R. Pate. Eddy current results have been compared to metallographic analysis results afterwards. 1 Introduction Eddy current testing method is the main method for steam generator tubes inspection on the present.
The main objective of inspection is to detect the target form of degradation of all, or at least of most of the damaged tubes. Eddy current (EC) testing is the conventional method for inservice inspection (ISI) of steam generator (SG) tubing that is exposed to corrosive, high-pressure, and temperature environments.
This nondestructive evaluation (NDE) method has advanced significantly over the years in all areas associated with probe design,Cited by: 2. Developmentof a Multi-Channel Eddy Current Examination System for Automated Inspection of Steam Generator Tubing R. Werner, L. Bernus and H.
Jacob Krañwerk Union AG, Hammerbacherstraße West Germany 12+14, Erlangen, ABSTRACT A segmented absolute 8-coil probe for inspection of heat exchanger tubing has been developed together with the appropriate multi-channel eddy current Author: R.
Werner, L.v. Bernus, H. Jacob. In general, most eddy current examinations of steam generator tubing are performed during refueling outages. Additional mid-cycle inspections are, however, being performed at certain plants where significant steam generators tubing degradation has been identified.
Eddy current (EC) testing is currently the primary nondestructive evaluation (NDE) method used for in-service inspection (ISI) of steam generator (SG) tubes during plant outages.
Inspection 1) Existing eddy current techniques do not adequately account for all steam generator tubing variables, including tube material, wall thickness, and cable length. Technique extension without technically sound qualification could lead to less accurate tube integrity inputs; 2) For many degrada.
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Inspection and monitoring aimed at timely detection and characterization of the degradation is a key element for ensuring tube integrity.
Up to the early’s, the in-service inspection of SG tubing was carried out using single-frequency eddy current testing (ET) bobbin coils, which were adequate. In this paper we report on the experimental results demonstrating the potential of using cylindrical guided waves (CGW) for inspection of steam generator tubing (SGT).
The CGW ultrasonic technique is intended to complement the present eddy current (EC) practice for in-service inspection as well as to provide an alternative tool for pre-service inspection.
Takagi et al.,ECT research activities in JSAEM—Benchmark models of eddy current testing for steam generator tube (Part 1), in NDT of Materials,R. Collins et al., eds. (IOS Press, ), pp. – Techniques which have been employed to increase eddy current inspection speed of steam generator tubes, have involved multiplexing, simultaneous injection, or employment of eddy current arrays [ At the in – service inspection of the steam generator (SG) tubings in PWR plants, eddy current testing (ECT) has been widely used at each outage.
At present, ECT data evaluation is mainly performed by ECT data analyst, therefore it has the following problems. Only ECT signal configuration on the impedance trajectory is used in the evaluation.
As an example, let’s examine eddy current testing equipment. Eddy current testing equipment uses magnetic fields to detect anomalies near the surface of conductive materials. This allows companies to test the integrity of everything from tubing to turbines, in situ, without needing to destroy them.
planned inspections. One of the main inspection methods of steam generator tubes has been eddy current method (ET). It is a method with high inspection speed. Eddy current method is sensitive to inner surface (ID) and outer surface (OD) defects like cracks, pits, wastages and wearing. One of the concerns in the field of steam generator tubing is magnetite deposits accumulating on the secondary side of the.
Details Evaluation of the eddy-current method for the inspection of steam generator tubing FB2
Degradation of nuclear steam generator (SG) tubes and support structures can result in a loss of reactor efficiency. Regular in-service inspection, by conventional eddy current testing (ECT), permits detection of cracks, measurement of wall loss, and identification of other SG tube degradation modes.
However, ECT is challenged by overlapping degradation modes such as might occur for SG tube. The eddy current test method and the related remote field testing method provide high-speed inspection techniques for these applications.
A technique that is often used involves feeding a differential bobbin probe into the individual tube of the heat exchanger. Eddy current testing is a widely used nondestructive testing (NDT) method, particularly for inspecting the heat-exchanger tubes in steam generators.
In various NDT methods, eddy current testing (ECT) technique is widely used for surface and near surface defect inspection, and characterization of electrical conductive materials. This chapter gives brief introduction of theories and applications of advanced ECT, with emphases on the probe design and numerical simulation methods.
Tubing inspection is generally limited to non-ferromagnetic tubing and is known as conventional eddy current testing. Conventional ECT is used for inspecting steam generator tubing in nuclear plants and heat exchangers tubing in power and petrochemical industries.
Description Evaluation of the eddy-current method for the inspection of steam generator tubing PDF
The technique is. Hence there is a strong economic incentive to develop reliable nondestructive evaluation (NDE) methods for steam generator tube inspection. Eddy current (EC) inspection has proved to be both fast and effective in detecting and sizing most of the degradation mechanisms that.
Evaluation of multiparameter eddy current technology for inspection of steam generator tubing. [S D Brown; Brookhaven National Laboratory. Department of Nuclear Energy. Evaluation of multiparameter eddy current technology for inspection of steam generator tubing (OCoLC) recorded eddy current data, with the exception of ASME Section XI examination of steam generator tubing, is included in eddy current testing.
Evaluation of steam generator examination data requires an additional Eddy Current Analyst (ET-A) certification. I Maanetic Particle Testinn (MT) - A method of examination of ferromagnetic. eddy current inspection strategy and practice as well as in the approach to steam generator heat exchanger tube structural integrity assessment (plugging criteria for defective tubes vary from 40 to 90 % wall thickness degradation).
Abstract Degradation of nuclear steam generator (SG) tubes and support structures can result in a loss of reactor efficiency. Regular in-service inspection, by conventional eddy current testing (ECT), permits detection of cracks, measurement of wall loss, and identification of other SG tube degradation modes.
CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Eddy current testing (ECT) is a conventional inspection method of heat exchanger tubes.
Many types of probes have been developed depending on such tube conditions as tube shapes and materials. However, the vicinity of a tube expansion is still a difficult area to inspect. An advanced course on the eddy current testing of steam generator and heat exchanger tubing or aircraft structures.
It follows ASNT SNT-TC-1A guidelines and ATA /FAR requirements. Emphasis is on advanced single- and multi-frequency eddy current techniques. Basic data evaluation is covered. The course will teach you principles of eddy current theory and practical eddy current examination of tubing as found in condensers, heat exchangers and air conditioning units.
The training is in accordance with BS EN ISO and covers the techniques of surface inspection and/or internal bore inspection and is supported by examinations. To detect degradation in steam generator (SG) tubes, periodic inspection using nondestructive examination techniques, such as an eddy current testing, is a common practice.
Therefore, it is critical to evaluate and validate the reliability of the eddy current technique for. In MarchPalo Verde Nuclear Generating Station`s Unit 2 sustained a tube rupture within steam generator A search for the root cause of failure identified intergranular stress corrosion cracking (IGSCC) in the hot leg upper bundle.
Subsequent eddy current inspections and tube pull evaluations supported this conclusion.In-line Inspection of Tubing. External eddy current encircling test coils are commonly used for inspecting high quality metal tubing of wall thicknesses less than 6 mm. When the tube is made of a magnetic material there are two main problems.4.
Eddy current data are recorded as the probe is withdrawn, and then interpreted to determine the depth of flaws located in the tube. Typical sup port plates through which the tubes pass are made from mild steel with thicknesses up to 3/4 inch.
Fig. 3. Eddy current probes tor steam generator tubing inspection.
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