NB/T 20003.3-2010Non - Destructive testing for mechanical components in nuclear island of nuclear power plants - Part 3: Radiographic testing (English PDF)
核电厂核岛机械设备无损检测 第3部分：射线检测
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Issued by
NEA
Level / Type
Industry · Recommended
Issue date
May 1, 2010
Implementation date
October 1, 2010
Scope
NB/T 20003.3-2010 is the English-translated version of 核电厂核岛机械设备无损检测 第3部分：射线检测.
NB/T 20003.3-2010 is the Chinese standard "Non - Destructive testing for mechanical components in nuclear island of nuclear power plants - Part 3: Radiographic testing".
Its scope clause reads: NB/T 20003 specifies the non-destructive testing method, quality classification of testing results and recommendatory acceptance criteria of mechanical components in nuclear island of nuclear power plants.
This part of NB/T 20003 specifies technical requirements and acceptance criteria with mechanical components in nuclear island of nuclear power plants tested by X-ray and gamma-ray.
This part is applicable to radiographic testing of castings and welded joints in mechanical components in nuclear island of nuclear power plants when in manufacture and assembly processes. Its clauses include terms and definitions.
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Document preview — NB/T 20003.3-2010
National Standard of the People's Republic of China
- Replacing
- EJ/T 1039-1996
Issued by: National Energy Administration of the People's Republic of China
Contents
- Foreword i
- 1 Scope
- 2 Normative References
- 3 Terms and Definitions
- 4 General Requirements
- 4.1 Testing Personnel
- 4.2 Testing Documentation
- 4.3 Reference Negative Film
- 4.4 Testing Range
- 4.5 Radiation Protection
- 5 Equipment and Apparatus
- 5.1 Radiographic Source
- 5.2 Film System
- 5.3 Densitometer and Standard Density Strip
- 5.4 Film Viewing Illuminator
- 6 Testing Conditions
- 6.1 Surface Preparation
- 6.2 Selection of Ray Energy
- 6.3 Geometric Unsharpness
- 6.4 Ratio of Max. and Min. Penetrated Thickness
- 7 Testing Technology
- 7.1 Radiography Arrangement
- 7.2 Image Quality Indicator(IQI)
- 7.3 Cassette Composition
- 7.4 Filter
- 7.5 Masking Board and Protection against Scattered Rays
- 7.6 Mark
- 8 Darkroom Processing of Film
- 9 Film Evaluation Requirements
- 10 Quality of Negative Film
- 10.1 Negative Film Mark
- 10.2 Pseudo-flaw of Negative Film
- 10.3 Density of Negative Film
- 10.4 Image Quality of Negative Film
- 11 Radiographic Testing of Castings
- 11.1 General Requirements
- 11.2 Timing of Testing
- 11.3 Testing Range
- 11.4 Surface Cleaning
- 11.5 Type of Film
- 11.6 Filter
- 11.7 Radiography Mode and Negative Film Evaluation
- 11.8 Image Quality Indicator (IQI)
- 11.9 Radiographing of Rough Castings
- 11.10 Protection against Occultation and Limb Scattering
- 11.11 Small-diameter Pumps and Valves
- 11.12 Radiographing Area
- 11.13 Testing of Repair Welded Areas
- 11.14 Acceptance Criteria
- 12 Radiographic Testing of Welded Joints
- 12.1 General Requirements
- 12.2 Timing of Testing
- 12.3 Testing Area
- 12.4 Surface Preparation
- 12.5 Type of Film
- 12.6 Radiography Mode
- 12.7 Image Quality Indicator
- 12.8 Special Conditions
- 12.9 Marking of Tested Area
- 12.10 Testing of Repair Area
- 12.11 Acceptance Criteria
- 13 Test Report
- Annex A (Normative) Characteristic Indexes of Industrial Radiographic Film System
- Annex B (Normative) Calculation of Effective Focus Size of Radiographic Source
- Annex C (Informative) Schematic Diagrams for Typical Radiography Modes of Welded Joints
- Annex D (Informative) Method for Determining the Minimum Radiography Times of Circumferential Butt Welded Joints
- Annex E (Normative) Placement Position of Overlapping Marks
- Annex F (Informative) Manual Processing of the Film
- Annex G (Informative) Radiographing Area Denotation of Casting
- Annex H (Normative) Radiography Mode for Full Penetration Corner Joints
- Annex I (Normative) Special Image Quality Indicator
1 Scope
NB/T 20003 specifies the non-destructive testing method, quality classification of testing results and recommendatory acceptance criteria of mechanical components in nuclear island of nuclear power plants.
This part of NB/T 20003 specifies technical requirements and acceptance criteria with mechanical components in nuclear island of nuclear power plants tested by X-ray and gamma-ray.
This part is applicable to radiographic testing of castings and welded joints in mechanical components in nuclear island of nuclear power plants when in manufacture and assembly processes.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GBZ 117 Radiological Protection Standards for Industrial X-ray Detection
GBZ 132 Radiological Protection Standards for Industrial Ganna-radiography
GB 11533 Standard for Logarithmic Visual Acuity Charts
GB/T 12604.2 Terminology for Nondestructive Testing Radiographic Testing
GB 18871 Basic Standards for Protection against Lonizing Radiation and for the Safety of Radiation Sources
JB/T 7902 Non-destructive Testing-Image Quality Indicators (Wire Type) for Radiographic Testing
JB/T 7903 Industrial Radiographic Illuminators
NB/T 20003.1 Non-destructive Testing for Mechanical Components in Nuclear Island of Nuclear Power Plants - Part 1: General Requirements
ASTM E186 Standard Reference Radiographs for Heavy-walled (2 to 41/2-in.[51 to 114-m m]) Steel Castings
ASTM E192 Standard Reference Radiographs for Investment Steel Castings for Aerospace Applications
ASTM E280 Standard Reference Radiographs for Heavy-walled (41/2 to 12-in.[114 to 305-mm]) Steel Castings
ASTM E446 Standard Reference Radiographs for Steel Casting up to 2 in.[51mm] in Thickness
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 12604.2 and NB/T 20003.1 and the following apply.
3.1 penetrated thickness
T the nominal thickness of material in the direction of radiography, or the sum of nominal thicknesses of each layer of materials in case of multiple-wall radiography
3.2 object-to-film distance
b the distance between the surface of tested workpiece at the radiographic source side and the film measured along the central axis of the radiation beam
3.3 source-to-object distance
f the distance between the radiographic source and the surface of tested workpiece at the radiographic source side measured along the central axis of the radiation beam
3.4 source-to-film distance
F the distance between the radiographic source and the film measured along the central axis of the radiation beam
3.5 source size
d the effective focal spot size of radioactive isotope source or X-ray tube
3.6 rounded defect
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 38 pages — is available in the English PDF.
Referenced standards
Cited by
- GB/T 16702.6-2025Design specification for mechanical components in nuclear island of pressurized water reactor nuclear power plants - Part 6: Reactor vessel internals
- NB/T 20482-2018Specification for design and construction of steel containment vessel of nuclear power plant of PWR
- NB/T 20009.23-2017Welding material for pressurized water reactor nuclear power plants - Part 23: Stainless steel covered electrodes for safety-related components
- NB/T 20009.27-2017Welding material for pressurized water reactor nuclear power plants - Part 27: Stainless steel wires and filler rods for safety related components
- NB/T 20416-2017Design and manufacture standard for nuclear-grade metal bellows expansion joints for PWR nuclear power plants
- NB/T 20376-2016Installation and acceptance regulation for nuclear island main steam superpiping of PWR nuclear power plant
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Editions of NB/T 20003.3
| Edition | Title | Revision | Status |
|---|---|---|---|
| NB/T 20003.3-2010 | Non - Destructive testing for mechanical components in nuclear island of nuclear power plants - Part 3: Radiographic testing | current edition | Current |
| EJ/T 1039-1996 | Non - Destructive testing for mechanical components in nuclear island of nuclear power plants - Part 3: Radiographic testing | previous edition | Superseded |
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NB/T 20003.4-2021 — Non-destructive testing for mechanical components in nuclear island of nuclear power plants - Part 4: Penetrant testing
NB/T 20003.2-2010 — Non-destructive testing for mechanical components in nuclear island of nuclear power plants - Part 2: Ultrasonic testing
NB/T 20003.4-2010 — Non-destructive testing for mechanical components in nuclear island of nuclear power plants - Part 4: Penetrant testing
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