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GB/T 25450-2010: Eddy current testing of fuel element end cap weld for PHWR
Status: Valid
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 25450-2010 | English | 139 |
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Eddy current testing of fuel element end cap weld for PHWR
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GB/T 25450-2010
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Basic data | Standard ID | GB/T 25450-2010 (GB/T25450-2010) | | Description (Translated English) | Eddy current testing of fuel element end cap weld for PHWR | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | F48 | | Classification of International Standard | 27.120 | | Word Count Estimation | 6,617 | | Date of Issue | 2010-11-10 | | Date of Implementation | 2011-05-01 | | Regulation (derived from) | Announcement of Newly Approved National Standards 2010 No. 8 (No. 163 overall) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the CANDU nuclear power plant fuel element end plug welds principle of eddy current testing methods, standards, injury, equipment, testing procedures and so on. This standard applies to CANDU nuclear power plant fuel elements weld seam after processing NDT. | GB/T 25450-2010: Eddy current testing of fuel element end cap weld for PHWR---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Eddy current testing of fuel element end cap weld for PHWR
ICS 27.120
F48
National Standards of People's Republic of China
CANDU nuclear power plant fuel element
End plug welds Eddy Current Testing
Issued on. 2010-11-10
2011-05-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
The standard proposed by China National Nuclear Corporation.
This standard by the National Standardization Technical Committee of nuclear energy.
This standard was drafted. China North Nuclear Fuel Limited.
The main drafters. Zhang Junjie, Li Aijun, Wang Jun, Zhang Jie, Han Ping Shan.
CANDU nuclear power plant fuel element
End plug welds Eddy Current Testing
1 Scope
This standard specifies the principle of the method CANDU nuclear power plant fuel element end plug welds eddy current testing, standards injuries, equipment, testing and other steps
content.
This standard applies to CANDU nuclear power plant fuel elements processed seam weld NDT.
2 Terms and definitions
The following terms and definitions apply to this standard.
2.1
Standard injury standardflaw
In the end plug welds artificial surface tapered blind hole making, including contrast sensitivity testing standards and standard wound injury.
2.2
Sensitivity testing standards injury sensitivestandardflaw
Eddy current testing system used to test the sensitivity of the standard injury.
2.3
Compare Standard injury referencestandardflaw
Whether or not qualified to evaluate the element of injury standard.
3 PRINCIPLE OF THE METHOD
According to the principle of electromagnetic induction law, a certain frequency of current excitation coil so that the coil produces an alternating current, the alternating current generated post
Varying magnetic field, thereby generating eddy currents in the workpiece, the alternating magnetic field induced eddy currents generated by the detection coil, an induced electromotive force in the detecting coil and
Induced current. When the subject of the workpiece surface or near surface defects detection coil impedance changes can be detected by measuring the coil resistance
Anti or a change in voltage detected defect.
4 Standard injury
4.1 Dimensions
Sensitivity testing standards injury. a taper of 60 ° ± 1 °, the depth of the blind hole of 0.15mm ± 0.01mm.
Contrast injury criteria. a taper of 60 ° ± 1 °, a depth of 0.20mm ± 0.01mm blind hole.
4.2 Production
Select the weld defect-free element in end plug welding the normal production process, with the taper indenter 60 ° ± 1 ° of welding at the end plug
Production standards injury, or other equivalent method of production standards to meet the requirements of the injury.
4.3 Evaluation
Taper and depth of the standard has been set with injuries tapered head pressure control, therefore, with the projector measuring head taper measuring microscopic
Measuring mirror blind hole depth, taper and depth as long as requirements are met, in line with the requirements of the standard injury.
4.4 Save
Save standard injury should be avoided bump end plug welds and components bending.
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