GB/T 25450-2010Eddy current testing of fuel element end cap weld for PHWR (English PDF)
重水堆核电厂燃料元件端塞焊缝涡流检测
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
November 10, 2010
Implementation date
May 1, 2011
Scope
GB/T 25450-2010 is the English-translated version of 重水堆核电厂燃料元件端塞焊缝涡流检测.
GB/T 25450-2010 is the Chinese standard "Eddy current testing of fuel element end cap weld for PHWR". Its scope clause reads: 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. Its clauses include terms and definitions; principle of the method; standard injury.
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Document preview — GB/T 25450-2010
National Standard of the People's Republic of China
- ICS
- 27.120
- Classification
- F 48
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Terms and definitions
- 3 PRINCIPLE OF THE METHOD
- 4 Standard injury
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
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
Eddy current testing system used to test the sensitivity of the standard injury.
2.3 Compare Standard injury
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.
GB/T 10266-2008 | GB/T 11813-2026 | GB/T 25451-2010 | GB/T 25448-2010 | […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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