NB/T 20424-2017Setting requirements for flow restrictors in nuclear power plant (English PDF)
核电厂限流孔板设置要求
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Issued by
NEA
Level / Type
Industry · Recommended
Issue date
February 10, 2017
Implementation date
July 1, 2017
Scope
NB/T 20424-2017 is the English-translated version of 核电厂限流孔板设置要求.
NB/T 20424-2017 is the recommended Chinese energy industry standard that fixes the setting requirements for flow restrictors in nuclear power plants. It specifies those requirements for restrictor orifice plates used in pressurized water reactor plants, together with the methods by which the pressure drop across them is calculated.
Its field of application is the setting of orifice plates in the process system piping of a pressurized water reactor nuclear power plant. It quotes GB/T 2624.2-2006.
It carries the Chinese classification F65 and the international classification 27.120.20. Issued on 10 February 2017, it has applied since 1 July 2017.
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Document preview — NB/T 20424-2017
National Standard of the People's Republic of China
- ICS
- 27.120.20
Issued by: National Energy Administration of the People's Republic of China
Contents
- [Preview only]
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Technical requirements
- 4.1 Environmental conditions
- 4.2 Operating conditions during on-grid operation
- 4.3 Wind turbine conditions during off-grid power supply
- 4.4 Bearing current
- 4.5 Isolation insulation resistance
- 4.6 Performance requirements
- 4.7 Sensors
- 4.8 Electromagnetic compatibility requirements
- 4.9 Human-machine interaction
- 5 Test methods
- 5.1 Test requirements
- 5.2 Test principles and methods
- 6.1 Samples and interfaces
- 6.2 Technical requirements for test items
- 7 Inspection rules
- 7.1 Basic function test
- 7.2 Touch current test
- 7.3 Loading test
- 7.4 Braking test
- 7.5 Machine-side differential mode voltage dU/dt value
- 7.6 Temperature rise test
- 7.7 Converter module current sharing test
- 7.8 Filter capacitor switching current test
- 7.9 Filter capacitor operating current test
- 8 Product nameplate, marking, packaging, transportation and storage
- 9 Assembly alignment of weldments
1 Foreword
NB/T 20424-2017 was issued by National Energy Administration of the People's Republic of China on 10 February 2017 and has been in force since 1 July 2017.
The NB/T prefix marks a recommended standard. It is not law in itself: it becomes binding when a contract names it, when a regulation or a mandatory standard refers to it, or when a producer declares conformity with it.
The document runs to 15 pages in English translation.
2 Scope Preview
This standard is the recommended Chinese energy industry standard that fixes the setting requirements for flow restrictors in nuclear power plants. It specifies those requirements for restrictor orifice plates used in pressurized water reactor plants, together with the methods by which the pressure drop across them is calculated. Its field of application is the setting of orifice plates in the process system piping of a pressurized water reactor nuclear power plant. It quotes GB/T 2624.2-2006. It carries the Chinese classification F65 and the international classification 27.120.20.
NB/T 20424-2017 falls under ICS 27.120.20, in the field of energy and heat transfer engineering.
This catalogue holds 1,264 other NB/T standards in that field.
In this catalogue, NB/T standards carry edition years from 2009 to 2026.
3 Normative references
GB/T 2624.2-2006 — Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - Part 2: Orifice plates
4 About this standard
Issued by: National Energy Administration of the People's Republic of China
English translation: about 15 pages
5 Related standards
Standards on related subjects:
NB/T 20015-2021 — Nuclear power plant simulators for use in operator training and examination
NB/T 20332-2015 — Construction requirements for prestressed concrete containments for pressurized water reactor nuclear power plants
NB/T 20325.1-2014 — Prestressing technology specification for safety containment of PWR nuclear power plants - Part 1: Material
NB/T 20419-2017 — Design criteria for containment filtration and exhaust system of pressurized water reactor nuclear power plant
NB/T 20415-2017 — Technical specification of secondary design of steel structure in nuclear power plant
NB/T 20414-2017 — Technical requirements for post-installed components of nuclear safety related concrete structures in nuclear power plants
6 Classification and status
International classification (ICS): 27.120.20
Chinese Standard Classification (CCS): F 65
Prefix NB/T: recommended standard.
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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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Related Standards
GB/T 2624.2-2006 — Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - Part 2: Orifice plates
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