NB/T 20073-2012Criterion for Instrumentation and Control Equipment Grounding in Nuclear Power Plants (English PDF)
核电厂仪表和控制设备接地准则
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Issued by
NEA
Level / Type
Industry · Recommended
Issue date
January 6, 2012
Implementation date
April 6, 2012
Scope
NB/T 20073-2012 is the English-translated version of 核电厂仪表和控制设备接地准则.
NB/T 20073-2012 is the Chinese standard "Criterion for Instrumentation and Control Equipment Grounding in Nuclear Power Plants".
Its scope clause reads: This standard specifies the design requirements for isolation, shielding and grounding of instrumentation and control equipment in nuclear power plants and gives out the implementation methods for grounding and shielding.
This standard is applicable to the design, examination, maintenance and operation of grounding and shielding for instrumentation and control equipment in nuclear power plants. Its clauses include terminologies and definitions.
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Document preview — NB/T 20073-2012
National Standard of the People's Republic of China
- ICS
- 27.120.30
- Replacing
- EJ/T 1065-1998
Issued by: National Energy Administration of the People's Republic of China
Contents
- Foreword i
- Introduction ii
- 1 Scope
- 2 Normative References
- 3 Terminologies and Definitions
- 4 Protective Design for Electromagnetic Interference
- 4.1 Safety Objective of Protective Design
- 4.2 Analysis for Interference Source and Mode
- 4.3 Criteria for arranging of Instrumentation and Control Equipment Cable
- 4.4 Criteria for Shielding and Grounding Design
- 5 Shielding Design
- 5.1 General Requirements for Shielding Design
- 5.2 Shielding of Signal Lines
- 5.3 Shielding of Electronic Equipment
- 6 Grounding of the Instrumentation and Control System
- 6.1 General Requirements
- 6.2 Equipment Safety Grounding
- 6.3 Signal Grounding
- 6.4 Signal Cable Shield Grounding
- 6.5 Grounding of Multiple-Channel Data Transmission System
- 6.6 Grounding of Computer System
- 6.7 Grounding of the Central Distribution Frame
- 6.8 Instrumentation Power Supply Grounding
- 7 Tests
- 7.1 Ground Loop Test
- 7.2 Insulation Resistance Test
- Appendix A (Informative) Interference Source and Mode
- Appendix B (Normative) Minimum Section Area of Grounding Conductor
- Appendix C (Informative) Examples of Grounding Methods
- Appendix D (Informative) Ground Loop Test
- References
1 Scope
This standard specifies the design requirements for isolation, shielding and grounding of instrumentation and control equipment in nuclear power plants and gives out the implementation methods for grounding and shielding.
This standard is applicable to the design, examination, maintenance and operation of grounding and shielding for instrumentation and control equipment in nuclear power plants.
2 Normative References
The following documents are indispensable for the application of this document. For dated references, only the dated editions apply. For undated references, the latest edition of the normative document (including any amendments) applies.
GB/T 13286-2008 Criteria for Independence of Class 1E Equipment and Circuits in Nuclear Power Plants
3 Terminologies and Definitions
For the purposes of this document, the following terminologies and definitions apply.
3.1 Electromagnetic noise
A kind of obvious time-varying electromagnetic phenomena without information transmission, which may be superposed or combined with useful signals.
3.2 Differential-mode (DM) noise
The noise voltage or current that appears in the same mode as the signal or power waveform on the disturbed circuit. DM noise is also referred to as transverse noise and normal mode noise.
Note: DM noise may be caused by one or more of the following:
a) Electrostatic fields linking unequally with the distributed capacitance of the distributed signal wires.
b) Magnetic induction linking magnetic fields unequally with the disturbed signal wires.
c) Electromagnetic wave coupling. Electric dipole (or monopole) antennas and/or magnetic loop antennas inadvertently formed in the signal wire or cable can detect electromagnetic wave radiation and cause it to appear as DM noise on the circuit conductors.
d) Junction or thermal potentials due to the use of dissimilar metals in the connection system.
e) CM to DM noise conversion in the disturbed path, particularly via transformer coupling actions.
3.3 Common-mode (CM) noise
The noise voltage and current that appear equally on each signal wire, power wire, control wire and between reference points and system grounding points. CM noise is also referred to as longitudinal-mode noise.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 16 pages — is available in the English PDF.
Referenced standards
Normative references
Similar standards
Editions of NB/T 20073
| Edition | Title | Revision | Status |
|---|---|---|---|
| NB/T 20073-2012 | Criterion for Instrumentation and Control Equipment Grounding in Nuclear Power Plants | current edition | Current |
| EJ/T 1065-1998 | Criterion for Instrumentation and Control Equipment Grounding in Nuclear Power Plants | previous edition | Superseded |
This page sells the current edition, NB/T 20073-2012. Earlier editions are listed for reference only.
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