GB/T 38980-2020 in English
VALIDTest method for artificial defect sizes of zirconium tube flaw detection comparison samples
- Issued on:2020-07-21
- Implemented on:2021-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$97.00
《GB/T 38980-2020锆管探伤对比试样人工缺陷尺寸测量方法》由TC243（全国有色金属标准化技术委员会）归口，TC243SC3（全国有色金属标准化技术委员会稀有金属分会）执行，主管部门为中国有色金属工业协会。
Introduction
Analysis of the core content of the standard
This standard specifies two precision measurement methods for artificial groove/through hole defects in comparison samples for zirconium tube flaw detection: replica measurement method and microscopic measurement method. The microscopic measurement method is suitable for measuring defects with a length of ≤5mm and a depth of ≤0.2mm, while the replica measurement method is suitable for defects of larger sizes.
Comparison of measurement methods
| Dimension | Replica measurement method | Microscopic measurement method |
|---|---|---|
| Applicable defect size | Length>5mm or depth/width>0.2mm | Length≤5mm and depth/width≤0.2mm |
| Measurement accuracy | ±0.01mm (vernier caliper) | ≤Tolerance 1/10 (200× magnification) |
| Operation complexity | Sample preparation, solidification and other processes are required | Direct optical measurement |
Key points of technical implementation
Operation specifications of microscopic measurement method
Take the three-dimensional reading microscope as an example:
- Sample pretreatment: fix in 20±5℃ environment after alcohol cleaning
- Optical adjustment: 100× magnification to locate defects, 200× magnification to measure depth
- Coordinate measurement: calculate size by X/Y/Z axis displacement
Typical application: A nuclear fuel element plant uses this method to measure the V-groove (0.15mm deep × 0.1mm wide) of the Zr-4 alloy tube, with a measurement uncertainty of ≤±2μm.
Background of Standard Evolution
This standard fills the gap in the quantitative measurement of defects in nuclear-grade zirconium tube flaw detection specimens. Compared with the YB/T145 steel tube standard:
- A new microscopic measurement method is added to meet the needs of small defect detection
- The calibration cycle (annual inspection) of three-dimensional measurement equipment is clarified
- The classification of artificial groove morphology is refined (U/V/rectangular groove)
Implementation Suggestions
1. Equipment selection:Preferably use a microscopic measurement system with automatic edge recognition function
2. Quality control:Establish a defect measurement database for trend analysis
3. Staff training:Focus on training GB/T8170 numerical rounding rules
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