GB/T 11809-2021 in English
VALIDTest method of weld of fuel rod for PWR—Metallographic examination and radiographic testing
- Issued on:2021-10-11
- Implemented on:2022-05-01
- File Format:PDF
- Delivery:Via email within 5 business days
$418.00
《GB/T 11809-2021压水堆燃料棒焊缝检验方法 金相检验和X射线照相检验》由TC58（全国核能标准化技术委员会）归口，TC58SC5（全国核能标准化技术委员会核燃料技术分会）执行，主管部门为国家标准化管理委员会。
Introduction
Core changes in the standard revision
| Revision dimensions | 2008 version | 2021 version |
|---|---|---|
| Terminology | Five terms such as girth weld penetration | Eight new terms such as Dense zone length and V-groove |
| Inspection method | Only electron beam/TIG welding | Added metallographic inspection of pressure resistance welding (4.5.2.3) |
| Equipment requirements | Sandpaper specifications are unclear | Limited grit size to P120~P2400 (4.2.6) |
Key technical requirements
1. Metallographic inspection upgrade
Special inspection for pressure resistance welding: Added longitudinal/cross-section sample preparation method (Appendix B), requiring the inspection of dense area length (Figure 3) and V-groove defects (Figure 4), with the inspection multiple not less than 100× (Appendix D).
2. Improvement of X-ray Photography
- Semi-compensation photography method: Added the minimum penetration thickness calculation formula (Appendix F), the residual thickness of the compensation block ≥ wmin
- Transmission parameters: The geometric unsharpness formula is adjusted to Ug=d×b/(ffd-b) (5.5.5)
- Image quality meter sensitivity: According to the penetration thickness classification requirements (Table 2)
Implementation suggestions
Case: Pressure resistance welding inspection process
- According to Appendix B.5, cut the cross-section sample (l=1.6~1.8mm)
- Mechanical polishing to remove the bond line (4.5.3.1)
- Chemical etching (oxalic acid solution 20s)
- Measure the length of the dense zone under a 100× microscope (Figure 3)
Notes on the transition period between the old and new standards
- The old version can be implemented before May 1, 2022
- The temperature of the thermal dyeing method is adjusted from 400-500℃ to 450℃±50℃ (Table C.1)
- Delete the single pore penetration measurement diagram (2008 version C.4-C.6)
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