NB/T 20149-2012 PDF English
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NB/T 20149-2012: Qualification procedure for pressure transmitter important to safety of 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/NBT20149-2012
ENERGY INDUSTRY STANDARD OF
THE PEOPLE��S REPUBLIC OF CHINA
ICS 27.120.99
F 82
Filing number. 38339-2013
Qualification procedure for pressure transmitter
important to safety of nuclear power plants
Issued on. OCTOBER 19, 2012
Implemented on. MARCH 01, 2013
Issued by. National Energy Administration
Table of Contents
Foreword... 4
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 6
4 Qualification test requirements... 9
4.1 General requirements... 9
4.2 Basic requirements for qualification tests... 9
4.3 Qualification test documents... 9
5 Program of qualification test... 9
5.1 Basic requirements... 9
5.2 Description of qualification device... 10
5.3 Qualification test conditions... 10
5.4 Qualification life goals... 11
5.5 Qualification margin... 11
5.6 Monitoring of functional characteristics during test... 12
5.7 Selection of test samples... 12
5.8 Evaluation of aging effects... 12
5.9 Maintenance during the test... 13
5.10 Test sequence... 13
5.11 Acceptance criteria... 14
5.12 Evaluation of test process... 14
6 Qualification test... 15
6.1 Compliance inspection and test preparation... 15
6.2 Reference test... 16
6.3 Test of influence quantity limit... 20
6.4 Test for evaluating the performance change of equipment over time... 33
6.5 Simulation test of design basis accident... 39
7 Records and reports... 47
7.1 Qualification test record... 47
7.2 Qualification test report... 47
Appendix A (Informative) Descriptions of pressure transmitter��s characteristics
... 48
Appendix B (Informative) Accuracy calculation... 50
Appendix C (Informative) Typical LOCA test curve... 53
1 Scope
This standard specifies the test methods, test items and sequence, test and
acceptance criteria during the test period for the qualification of the pressure
transmitter important to safety of nuclear power plants (including positive,
negative gauge pressure, differential pressure and absolute pressure).
This standard is applicable to the qualification of pressure transmitters for PWR
nuclear power plants, not to the software qualification of intelligent pressure
transmitters. The pressure transmitter of other types of nuclear power plant may
refer to this standard.
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/T 2423.1 Environmental testing for electric and electronic and electronic
products - Part 2.Test methods - Tests A. Cold
GB/T 2423.2 Environmental testing for electric and electronic products - Part
2.Test methods - Tests B. Dry heat
GB/T 2423.3 Environmental testing - Part 2.Testing method - Test Cab.
Damp heat, steady state
GB/T 2423.4 Environmental testing for electric and electronic products - Part
2.Test method - Test Db. Damp heat, cyclic (12h+12h cycle)
GB/T 2423.5 Environmental testing for electric and electronic products - Part
2.Test methods - Test Ea and guidance. Shock
GB/T 2423.10 Environmental testing for electric and electronic products -
Part 2.Tests methods - Test Fc. Vibration (sinusoidal)
GB/T 29308 Management requirement of ageing of instrumentation and
control systems important to safety for nuclear power plants
GB/T 12727 Qualification of safety class electrical equipment for nuclear
power plants
3 Terms and definitions
The terms and definitions defined in GB/T 12727 as well as the following terms
and definitions apply to this document.
3.1
Pressure transmitter
The instrument that converts the process variables (pressure, pressure
difference, liquid level, flow) into 4 mA ~ 20 mA standard electrical signals
3.2
Gauge pressure (or absolute pressure) transmitter
Transmitter whose output electrical signal is proportional to gauge pressure
(or absolute pressure) applied to the pressure tap.
3.3
Differential pressure transmitter
The transmitter whose output electrical signal is proportional to the pressure
difference between its two pressure taps.
3.4
Static pressure; differential pressure transmitter
Gauge or absolute pressure applied to a pressure tap of the transmitter.
3.5
Gauge pressure; absolute pressure
The pressure applied to the pressure tap of the transmitter for gauge
pressure (or absolute pressure).
3.6
Influence quantities
The quantity that is not measured but can affect the measurement result.
4 Qualification test requirements
4.1 General requirements
The qualification of the pressure transmitter shall prove that during the life of
the qualification, under the environmental conditions of the design basis
accident, the pressure transmitter important for safety has the characteristics of
implementing the safety functions specified in the technical specifications
(including insulation resistance, accuracy, response time).
4.2 Basic requirements for qualification tests
Each qualification test of the pressure transmitter shall be performed on the
same type of pressure transmitter. The test sample shall be consistent with the
actual transmitter in terms of design, material and manufacturing process. The
test conditions shall meet or exceed the most severe environmental and
operating conditions that may actually be experienced.
4.3 Qualification test documents
The qualification test results of the pressure transmitter shall be documented
as evidence that the pressure transmitter can implement its safety function
during the qualification life period and design basis accident period.
5 Program of qualification test
5.1 Basic requirements
The qualification of the pressure transmitter shall first compile the applicable
qualification test program, detailing the inspections, tests, performance
indicators, acceptance criteria, required analysis as required by the test
sample��s qualification test to prove that the pressure transmitter implements its
safety function.
5.2 Description of qualification device
5.2.1 Identification of device
It shall detail the type, manufacturer, procurement technical specifications and
manufacturing related documents of the pressure transmitter to be qualified
(including descriptions of functional and structural characteristics, drawings,
operation and maintenance manuals, material descriptions, relevant standard,
specifications).
5.3 Qualification test conditions
5.3.1 Test conditions during normal and abnormal operation
The qualification test program of the pressure transmitter shall determine the
magnitude of the test conditions (including rated values and limit values) and
their expected duration during normal and abnormal operation of the power
plant. These conditions include at least the following.
5.3.2 Test conditions for design basis accidents
The qualification test program of the pressure transmitter shall determine the
simulation test conditions during and after the following design basis accidents,
as well as the duration required to implement the safety function. These
conditions include changes in temperature, pressure, radiation dose over time,
chemical conditions, seismic loads, power supply surges.
5.4 Qualification life goals
The qualification test program shall, based on the power plant��s management
requirements and the pressure transmitter's technical specification
requirements, determine the target value of pressure transmitter's qualification
life. If the equipment specification does not determine the qualification life target,
the qualification test program shall determine the qualification life target of the
pressure transmitter according to GB/T 12727.
5.5 Qualification margin
In order to ensure that the pressure transmitter has satisfactory performance
under severe environmental and operating conditions, the qualification test
shall consider the qualification margin.
5.6 Monitoring of functional characteristics during test
The qualification test program shall determine the electrical performance and
functional characteristics (insulation resistance, accuracy, and / or response
time) to be measured during each test of the pressure transmitter and at the
end of the test and after the equipment is restored.
5.7 Selection of test samples
Some test items of the pressure transmitter��s qualification test may not be
conducted on the same test sample. The test shall determine the number of
test samples based on the installation location of the pressure transmitter
(inside the containment, in the equipment compartment, in the containment
annular space or outside the containment) as well as the configuration of the
test item.
5.10 Test sequence
The qualification test of the pressure transmitter shall be carried out in
accordance with the test sequence requirements as specified in GB/T 12727.
The test program shall formulate detailed test steps and sequences for
transmitters of different types of qualification requirements; the test sequence��s
configuration shall be such that the test samples are in the most severely
degraded state at the end of the qualification life. Table 1 lists the test
sequences for reference.
5.11 Acceptance criteria
The test program shall determine the acceptance criteria for the electrical
performance and functional characteristics of the test samples at each stage of
the qualification test based on the performance requirements specified in the
technical specifications for equipment purchase.
5.12 Evaluation of test process
The values of functional characteristics monitored by each test during the
qualification test shall be compared with the acceptance criteria. If a deviation
occurs, it shall be based on the analysis and evaluation of the acceptance
criteria to determine whether to continue or abort the test.
6 Qualification test
6.1 Compliance inspection and test preparation
6.1.1 Compliance inspection
Prior to the start of the qualification test, it shall perform the compliance
inspection of the test samples and relevant documents (including material
qualification certificates, strength calculations, etc.), to confirm that the samples
to be tested represent pressure transmitters that require on-site installation (see
Appendix A).
6.1.2 Test preparation
6.1.2.1 Adjustment of pressure transmitter
Each test of the pressure transmitter��s qualification test shall be conducted after
the zero point and sensitivity are adjusted in accordance with the operating
instructions of the pressure transmitter.
Zero point and sensitivity are adjusted as follows.
6.1.2.2 Power supply and load resistance
The power supply voltage used for testing and measurement is equal to the
rated value given in the technical specifications; the ripple factor of the power
supply is less than 0.1% of the power supply voltage; the load resistance value
of the pressure transmitter is equal to the rated value specified in the
identification file.
6.2 Reference test
6.2.1 Dielectric strength measurement
6.2.1.1 Test conditions
The test is conducted by the use of an AC sine wave voltage which has a rated
frequency of 50 Hz. The test voltage is as shown in Table 2.
The test shall be conducted under normal atmospheric conditions, see JJG 882.
The pressure transmitter, together with the electrical connector, is grounded as
follows.
6.2.1.2 Test
Disconnect the power supply of the pressure transmitter. Short-circuit the power
terminal and the output terminal respectively. Measure the dielectric strength
between the power terminal and the ground terminal (housing), the power
terminal and the output terminal, the output terminal and the ground terminal
(housing) on the withstanding voltage tester.
6.2.1.3 Acceptance criteria
There shall be no breakdown or arcing in 1 minute.
6.2.2 Measurement of insulation resistance
6.3 Test of influence quantity limit
6.3.1 Dry heat test
6.3.1.1 Overview
The purpose of this test is to verify the adaptability of the dry heat effect of the
pressure transmitter during transportation and storage.
6.3.1.2 Test conditions
This test shall be carried out in accordance with the provisions of GB/T 2423.2
(Test B).
6.3.1.3 Measurement
After 4h restoration, it shall carry out the following measurements.
6.3.1.4 Acceptance criteria
If the technical specifications do not specify clearly, it may adopt the following
acceptance criteria.
6.3.2 Low temperature test
6.3.2.1 Overview
The purpose of this test is to verify the low temperature adaptability of the
pressure transmitter during transportation and storage.
6.3.2.2 Test conditions
This test shall be carried out in accordance with the provisions of GB/T 2423.1
(Test A).
6.3.5 Mechanical shock resistance test
6.3.5.1 Overview
The purpose of this test is to simulate the random impact adaptability that the
pressure transmitter may be subjected to during use or transportation.
6.3.5.2 Test conditions
This test shall meet the requirements of GB/T 2423.5.
The test is carried out under normal atmospheric conditions. The equipment is
not energized; it is fixed on a rigid bracket according to the on-site fixing method
of the pressure transmitter. The impact force shall be applied vertically on each
plane of the three reference axis of the pressure transmitter.
7 Records and reports
7.1 Qualification test record
Qualification test records shall include at least.
a) The model, identification and number of the device under test;
b) The name, model and number of the test device, equipment and
instruments used;
c) Detailed data and recording curves of test conditions;
d) Record (or record form) of each test;
e) Abnormal conditions that occurred during the test;
f) Tester's signature and date.
7.2 Qualification test report
The qualification test report shall include at least.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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