NB/T 20318-2014 PDF English
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NB/T 20318-2014: Pressure transmitter important to safety in nuclear power plants---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/NBT20318-2014
ENERGY INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 27.120.20
F 83
Filing number. 47837-2015
Pressure transmitter important to safety in nuclear
power plants
Issued on. OCTOBER 15, 2014
Implemented on. MARCH 01, 2015
Issued by. National Energy Administration
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 5
4 Transmitter type and electrical parameters... 7
5 Transmitter’s function and operating conditions... 8
6 Technical requirements... 9
7 Inspection and test... 17
8 Marking, packaging, transportation and storage... 24
9 Documentation... 24
Appendix A (Informative) Environmental conditions of pressure transmitters in
the containment of nuclear power plants... 26
1 Scope
This standard specifies the basic requirements for the design, manufacture,
qualification, testing and documentation of pressure transmitters important to
the safety of nuclear power plants.
This standard applies to pressure transmitters important to the safety for
continuous monitoring of process variables (pressure, flow, differential pressure,
level) in nuclear power plants.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB 4208-2008 Degrees of protection provided by enclosure (IP code)
GB/T 12727-1991 Qualification of electrical items of the safety systems for
nuclear power generating stations
GB/T 13625-1992 Seismic qualification of electrical equipment of the safety
system for nuclear power plants
GB/T 17626.2-2006 Electromagnetic compatibility (EMC) - Testing and
measurement techniques - Electrostatic discharge immunity test
GB/T 17626.3-2006 Electromagnetic compatibility - Testing and
measurement techniques - Radiated radio-frequency electromagnetic field
immunity test
GB/T 17626.4-2008 Electromagnetic compatibility - Testing and
measurement techniques - Electrical fast transient/burst immunity test
GB/T 18271.2-2000 Process measurement and control devices - General
methods and procedures for evaluating performance - Part 2.Tests under
reference conditions
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Error
The algebraic difference between the measured value and the true value of
the measured variable.
Note. When the measured value is greater than the true value, the error is a
positive value. The error is usually expressed as a percentage of the
corresponding ideal range.
[GB/T 18271.1-2000, definition 3.8]
3.8
Repeatability error
The algebraic difference between the limit values obtained by continuously
measuring and outputting the same input value for multiple times in a short
time when making a full range movement from the same direction under the
same working conditions.
Note. Repeatability errors are usually expressed as a percentage of range
and do not include hysteresis and drift.
[GB/T 17212-1998, P2.2.2.29]
3.9
Span shift
Set the range again according to the measurement needs.
3.10
Zero adjustment
Adjust the zero point of the meter to the specified value.
4 Transmitter type and electrical parameters
4.1 Transmitter type
A pressure transmitter is an instrument that converts a pressure variable into a
standardized output signal that can be transmitted, meanwhile there is a given
continuous functional relationship between the output signal and the pressure
variable (usually a linear function).
4.2 Electrical parameters
See Table 1 for detailed electrical parameters of the transmitter.
5 Transmitter’s function and operating conditions
5.1 Functions important to safety
The pressure transmitters important to safety are mainly used to detect the
pressure, flow rate and liquid level of the process system; provide necessary
signals for the protection systems and post-accident monitoring systems of
nuclear power plant, which is very important for ensuring the safe and reliable
operation of nuclear power plants.
6 Technical requirements
6.1 General performance requirements
6.1.1 Basic performance
6.1.1.1 Basic error
The basic error of the transmitter shall include the hysteresis and dead band
under certain conditions, which shall be at least grade 0.5.The test method is
carried out in accordance with the requirements of 7.3.1.
6.1.1.4 Response time
The response time required by the pressure transmitter shall be determined
according to the system function requirements. Except for special requirements
from users, it shall not be greater than 1.2s (at 90%).
6.1.2 Electrical performance
6.1.2.1 Insulation resistance
The insulation resistance between the output terminal of the transmitter and the
housing shall not be less than 100 MΩ. The test method is carried out in
accordance with the requirements of 7.3.12.
6.1.3 Immunity
6.1.3.1 Impact of power changes
When the power supply voltage (DC) changes between 12 V to 45 V, the output
signal’s change amount shall not be greater than 0.005% / V of the range. The
test method is carried out in accordance with the requirements of 7.3.7.
6.1.3.6 Impact of static pressure
When the static pressure of the differential pressure transmitter increases from
zero to the maximum working pressure, the static pressure will affect the output
signal of the transmitter; the change of the output signal shall not exceed ±
0.25%/6.9 MPa of the range. The test method is carried out according to the
requirements of 7.3.9.
6.1.3.10 Impact of output load
When the load resistance changes from the minimum value to the maximum
value as specified by the manufacturer, the change of its output signal shall not
exceed one half of the basic error. The test method is carried out in accordance
with the requirements of 7.3.8.
6.1.3.11 Impact of mechanical vibration
Except for the special requirements of the user, under the mechanical vibration
of the frequency range of the transmitter of 10 Hz ~ 60 Hz, the peak amplitude
of 0.07 mm, the frequency range of 60 Hz ~ 150 Hz, the acceleration of 9.8
m/s2, the change of output signal shall not exceed 1/2 of the basic error.
The test is carried out at 50% of the maximum range according to the
requirements of Chapter 7 of GB/T 18271.3-2000.
6.2 Nuclear safety-related performance requirements
6.2.1 Aging impact
The transmitter shall be subjected to aging test according to NB/T 20149-2012.
After the test, it shall be adjusted to meet the basic error requirements.
6.2.2 Irradiation impact
For the transmitters important to safety installed in a containment, they shall be
able to withstand a radiation test with a cumulative dose of 6 x 105 Gy in an
accident environment. Except for the special requirements of the user, the
maximum allowable error during and after the test shall not exceed ± 8% of the
maximum range.
6.2.3 Resistance to earthquake impact
According to the requirements of GB/T 13625-1992, the transmitter shall be
able to withstand three-axis earthquake test, at a vibration frequency of 2 Hz ~
35 Hz and zero-cycle acceleration of 4 x 9.8 m/s2.Except for the special
requirements of the user, the maximum allowable error during and after the test
shall not exceed ± 1% (grade 0.25) or ± 1.5% (grade 0.5) of the maximum range.
The test method is carried out according to the requirements of NB/T 20149-
2012.
7 Inspection and test
7.1 Inspection and test requirements
Inspection and test requirements shall include at least the following.
7.2 Test conditions
7.2.1 Environmental conditions
7.2.3 General requirements for testing
7.2.3.1 Except for the test of impact from the installation position, the transmitter
shall be in the normal working position during the test, that is, the detection
diaphragm is perpendicular to the horizontal plane.
7.2.3.2 Adjustments are allowed before each test; but adjustments are not
allowed during each test.
7.3 Basic performance test
7.3.1 Basic error test
The basic error test shall be carried out within the range. The test points shall
be equally distributed and not less than 5 points, but including 2 points equal to
or close to the upper and lower limits. Before the test, the transmitter shall move
up and down three rounds within the range;
7.4 Type test
7.4.1 Conventional test
For each type of transmitter, at least 3 transmitters of the same product are
used as samples to perform the test of the following items.
8 Marking, packaging, transportation and storage
8.1 Marking
The transmitter shall be marked of the following in a prominent position.
8.2 Packaging, transportation and storage
Unless the user has special requirements, the packaging of the transmitter shall
comply with the requirements of grade B packaging in 5.2.3 of EJ/T 564-2006.
The transport of the transmitter shall comply with the provisions of 6.1 of EJ/T
564-2006.
9 Documentation
During the design, manufacture, qualification, acceptance, use of pressure
transmitter important to safety, it shall retain the necessary documents and
inspection and test reports, including factory tests and type tests.
NB/T 20318-2014
ENERGY INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 27.120.20
F 83
Filing number. 47837-2015
Pressure transmitter important to safety in nuclear
power plants
Issued on. OCTOBER 15, 2014
Implemented on. MARCH 01, 2015
Issued by. National Energy Administration
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 5
4 Transmitter type and electrical parameters... 7
5 Transmitter’s function and operating conditions... 8
6 Technical requirements... 9
7 Inspection and test... 17
8 Marking, packaging, transportation and storage... 24
9 Documentation... 24
Appendix A (Informative) Environmental conditions of pressure transmitters in
the containment of nuclear power plants... 26
1 Scope
This standard specifies the basic requirements for the design, manufacture,
qualification, testing and documentation of pressure transmitters important to
the safety of nuclear power plants.
This standard applies to pressure transmitters important to the safety for
continuous monitoring of process variables (pressure, flow, differential pressure,
level) in nuclear power plants.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB 4208-2008 Degrees of protection provided by enclosure (IP code)
GB/T 12727-1991 Qualification of electrical items of the safety systems for
nuclear power generating stations
GB/T 13625-1992 Seismic qualification of electrical equipment of the safety
system for nuclear power plants
GB/T 17626.2-2006 Electromagnetic compatibility (EMC) - Testing and
measurement techniques - Electrostatic discharge immunity test
GB/T 17626.3-2006 Electromagnetic compatibility - Testing and
measurement techniques - Radiated radio-frequency electromagnetic field
immunity test
GB/T 17626.4-2008 Electromagnetic compatibility - Testing and
measurement techniques - Electrical fast transient/burst immunity test
GB/T 18271.2-2000 Process measurement and control devices - General
methods and procedures for evaluating performance - Part 2.Tests under
reference conditions
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Error
The algebraic difference between the measured value and the true value of
the measured variable.
Note. When the measured value is greater than the true value, the error is a
positive value. The error is usually expressed as a percentage of the
corresponding ideal range.
[GB/T 18271.1-2000, definition 3.8]
3.8
Repeatability error
The algebraic difference between the limit values obtained by continuously
measuring and outputting the same input value for multiple times in a short
time when making a full range movement from the same direction under the
same working conditions.
Note. Repeatability errors are usually expressed as a percentage of range
and do not include hysteresis and drift.
[GB/T 17212-1998, P2.2.2.29]
3.9
Span shift
Set the range again according to the measurement needs.
3.10
Zero adjustment
Adjust the zero point of the meter to the specified value.
4 Transmitter type and electrical parameters
4.1 Transmitter type
A pressure transmitter is an instrument that converts a pressure variable into a
standardized output signal that can be transmitted, meanwhile there is a given
continuous functional relationship between the output signal and the pressure
variable (usually a linear function).
4.2 Electrical parameters
See Table 1 for detailed electrical parameters of the transmitter.
5 Transmitter’s function and operating conditions
5.1 Functions important to safety
The pressure transmitters important to safety are mainly used to detect the
pressure, flow rate and liquid level of the process system; provide necessary
signals for the protection systems and post-accident monitoring systems of
nuclear power plant, which is very important for ensuring the safe and reliable
operation of nuclear power plants.
6 Technical requirements
6.1 General performance requirements
6.1.1 Basic performance
6.1.1.1 Basic error
The basic error of the transmitter shall include the hysteresis and dead band
under certain conditions, which shall be at least grade 0.5.The test method is
carried out in accordance with the requirements of 7.3.1.
6.1.1.4 Response time
The response time required by the pressure transmitter shall be determined
according to the system function requirements. Except for special requirements
from users, it shall not be greater than 1.2s (at 90%).
6.1.2 Electrical performance
6.1.2.1 Insulation resistance
The insulation resistance between the output terminal of the transmitter and the
housing shall not be less than 100 MΩ. The test method is carried out in
accordance with the requirements of 7.3.12.
6.1.3 Immunity
6.1.3.1 Impact of power changes
When the power supply voltage (DC) changes between 12 V to 45 V, the output
signal’s change amount shall not be greater than 0.005% / V of the range. The
test method is carried out in accordance with the requirements of 7.3.7.
6.1.3.6 Impact of static pressure
When the static pressure of the differential pressure transmitter increases from
zero to the maximum working pressure, the static pressure will affect the output
signal of the transmitter; the change of the output signal shall not exceed ±
0.25%/6.9 MPa of the range. The test method is carried out according to the
requirements of 7.3.9.
6.1.3.10 Impact of output load
When the load resistance changes from the minimum value to the maximum
value as specified by the manufacturer, the change of its output signal shall not
exceed one half of the basic error. The test method is carried out in accordance
with the requirements of 7.3.8.
6.1.3.11 Impact of mechanical vibration
Except for the special requirements of the user, under the mechanical vibration
of the frequency range of the transmitter of 10 Hz ~ 60 Hz, the peak amplitude
of 0.07 mm, the frequency range of 60 Hz ~ 150 Hz, the acceleration of 9.8
m/s2, the change of output signal shall not exceed 1/2 of the basic error.
The test is carried out at 50% of the maximum range according to the
requirements of Chapter 7 of GB/T 18271.3-2000.
6.2 Nuclear safety-related performance requirements
6.2.1 Aging impact
The transmitter shall be subjected to aging test according to NB/T 20149-2012.
After the test, it shall be adjusted to meet the basic error requirements.
6.2.2 Irradiation impact
For the transmitters important to safety installed in a containment, they shall be
able to withstand a radiation test with a cumulative dose of 6 x 105 Gy in an
accident environment. Except for the special requirements of the user, the
maximum allowable error during and after the test shall not exceed ± 8% of the
maximum range.
6.2.3 Resistance to earthquake impact
According to the requirements of GB/T 13625-1992, the transmitter shall be
able to withstand three-axis earthquake test, at a vibration frequency of 2 Hz ~
35 Hz and zero-cycle acceleration of 4 x 9.8 m/s2.Except for the special
requirements of the user, the maximum allowable error during and after the test
shall not exceed ± 1% (grade 0.25) or ± 1.5% (grade 0.5) of the maximum range.
The test method is carried out according to the requirements of NB/T 20149-
2012.
7 Inspection and test
7.1 Inspection and test requirements
Inspection and test requirements shall include at least the following.
7.2 Test conditions
7.2.1 Environmental conditions
7.2.3 General requirements for testing
7.2.3.1 Except for the test of impact from the installation position, the transmitter
shall be in the normal working position during the test, that is, the detection
diaphragm is perpendicular to the horizontal plane.
7.2.3.2 Adjustments are allowed before each test; but adjustments are not
allowed during each test.
7.3 Basic performance test
7.3.1 Basic error test
The basic error test shall be carried out within the range. The test points shall
be equally distributed and not less than 5 points, but including 2 points equal to
or close to the upper and lower limits. Before the test, the transmitter shall move
up and down three rounds within the range;
7.4 Type test
7.4.1 Conventional test
For each type of transmitter, at least 3 transmitters of the same product are
used as samples to perform the test of the following items.
8 Marking, packaging, transportation and storage
8.1 Marking
The transmitter shall be marked of the following in a prominent position.
8.2 Packaging, transportation and storage
Unless the user has special requirements, the packaging of the transmitter shall
comply with the requirements of grade B packaging in 5.2.3 of EJ/T 564-2006.
The transport of the transmitter shall comply with the provisions of 6.1 of EJ/T
564-2006.
9 Documentation
During the design, manufacture, qualification, acceptance, use of pressure
transmitter important to safety, it shall retain the necessary documents and
inspection and test reports, including factory tests and type tests.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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