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NB/T 20149-2012 English PDF (NBT20149-2012)

NB/T 20149-2012 English PDF (NBT20149-2012)

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NB/T 20149-2012: Qualification procedure for pressure transmitter important to safety of nuclear power plants

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.
NB/T 20149-2012
ENERGY INDUSTRY STANDARD OF
THE PEOPLE 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
Qualification procedure for pressure transmitter
important to safety of nuclear power plants
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
GB/T 13625 Seismic qualification of electrical equipment of the safety
system for nuclear power plants
GB/T 15478 Test methods of the performances for pressure
transducer/sensor
GB/T 17626.3 Electromagnetic compatibility - Testing and measurement
techniques - Radiated, radio-frequency, electromagnetic field immunity test GB/T 18271.2 Process measurement and control devices - General methods
and procedures for evaluating performance - Part 2: Tests under reference conditions
GB/T 26168.2 Electrical insulating materials - Determination of the effects of ionizing radiation - Part 2: Procedures for irradiation and test
NB/T 20040 Seismic qualification test rules of safety classified electrical equipment for nuclear power plants
JJG 882 Verification regulation of the pressure transmitter
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
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) .
The qualification test shall also determine the qualification life and end-of-life status indicators of the pressure transmitter that needs to implement safety functions in a harsh environment, as well as the installation method and interface configuration of the pressure transmitter in the field.
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.
The qualification test program shall include at least the requirements of 5.2 ~ 5.12.
h) Input and output signal ratings and operating limits;
i) Electromagnetic interference (EMI), radio frequency interference (RFI), power surges;
j) Software communication logic (only for smart transmitters).
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:
a) The main coolant pipe is broken (LOCA);
b) The main steam pipe in the containment ruptures (MSLB);
c) Other high-energy pipe ruptures (HELB);
d) Safety shutdown earthquake (SSE).
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.
For pressure transmitters in a mild environment, there is no requirement to determine the qualification life target.
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.
If the qualification margin is to increase the severity of the test conditions, the qualification margin is only imposed to the test conditions for design basis accident. The qualification test program shall give the value of the qualification margin. If the equipment?€?s technical specification does not give a qualification margin, it should use following margin values:
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:
- Correspond the zero value of the output signal to the minimum value of the pressure to be measured, or adjust it to the lower limit value of the rated measurement range, meanwhile make it have the same characteristics in
the measurement range (external zero adjustment);
- Adjust the sensitivity to the minimum value given in the technical
specifications.
These adjustments are made under the following circumstances:
- Before each initial test and the influence quantity limit test;
- Before the start of the test to evaluate the performance change of the equipment over time;
- Between two tests used to evaluate the performance change of the
equipment over time and between two tests to simulate DBE, if the pressure transmitter is moved;
- Before the performance test under the condition of thermal power accident. 6.1.2.2 Power supply and load resistance
The power supply voltage used for testing and measurement is equal to the - Test the cold-state pressure transmitter under normal atmospheric
conditions;
- Before the accident irradiation test, measure it at 500 V DC voltage for 1 min after energizing;
- After the accidental irradiation test, measure it at a voltage of 100 V. 6.2.2.2 Test
The voltage application point is the same as in the dielectric strength test. For the two-wire transmitter, it only tests the output terminal against the housing. 6.2.2.3 Acceptance criteria
During measurement, it shall take reading after being stabilized for 5 s. The minimum insulation resistance shall be greater than 100 M???.
6.2.3 Measurement of functional characteristics
6.2.3.1 Accuracy measurement
6.2.3.1.1 Overview
The accuracy of the pressure transmitter under the normal operation, abnormal operation and design basis accident conditions of the power plant shall meet the requirements of the technical specifications.
6.2.3.1.2 Measurement
The accuracy measurement shall be carried out in accordance with the
requirements of the technical specifications. If the technical specification does not give the measurement method, please refer to Appendix B for calculation. 6.2.3.1.3 Acceptance criteria
The acceptance criteria for pressure transmitters after different tests are given in the technical specifications. For example, the acceptance criteria for pressure transmitters in a nuclear power plant are as follows:
- Under reference conditions, the maximum accuracy error shall be less than or equal to 0.5%;
- Under the condition of the influence quantity limit, the maximum accuracy error shall be less than or equal to 2%;
- After all tests to evaluate the performance change of the equipment over time, the maximum accuracy error shall be less than or equal to 1.5%;
For each test, record the response time or time constant. If there is a time lag or overshoot, it shall be included in the report. See GB/T 18271.2 and JJG 882. 6.2.3.3.3 Acceptance criteria
After the initial measurement and evaluation of the performance change of the equipment over time, the response time of the pressure transmitter shall meet the requirements of the technical specifications.
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).
Gradually increase the temperature of the container where the pressure
transmitter is located from the ambient temperature to the maximum
temperature T. After reaching thermal equilibrium, hold the temperature constant at ??. Then gradually lower the temperature until the initial value is restored.
The rate of temperature change is always less than 1 ??C/min.
The absolute humidity shall be kept less than 20 g/m3 water vapor.
If the technical specification does not give a temperature limit, then T is taken as 70 ??C ?? 2 ??C, ?? is 96 h.
6.3.1.3 Measurement
After 4h restoration, it shall carry out the following measurements:
- Insulation resistance (see 62.2):
- Accuracy (see 6.2.3.1).
6.3.1.4 Acceptance criteria
If the technical specifications do not specify clearly, it may adopt the following acceptance criteria:
After the test, the pressure transmitter returns to its normal state; its functional characteristics shall not be affected.
6.3.3 Constant damp heat test
6.3.3.1 Overview
This test is to verify the adaptability of the pressure transmitter to store or operate under damp heat conditions without condensation.
6.3.3.2 Test conditions
This test shall be carried out in accordance with the provisions of GB/T 2423.3. The test conditions are as follows:
- Temperature: 40 ??C ?? 2 ??C;
- Relative humidity: (93 ?? 3)%.
The severity of the test is expressed in test time. The duration of this test is at least 4 days.
6.3.3.3 Measurement
After the test, it shall measure the following:
- Insulation resistance (see 6.2.2)
- Accuracy (see 6.2.3.1).
6.3.3.4 Acceptance criteria
If the technical specifications do not specify clearly, it may adopt the following acceptance criteria:
- Insulation resistance is not less than 10 M???;
- Accuracy is not greater than ?? 2%.
6.3.4 Cyclic damp heat test
6.3.4.1 Overview
This test verifies the adaptability of the pressure transmitter under the conditions of large relative humidity, possible temperature change and
condensation.
6.3.4.2 Test conditions
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.
The severity of the test is expressed by the combination of peak acceleration and the duration of the impact. If the technical specification does not specify it, it shall follow the requirements below:
a) Acceleration: 30 g;
b) Duration of impact: 18 ms;
c) Number of impacts in each direction: 3;
d) Test with sine wave, sawtooth wave or trapezoid wave shock.
6.3.5.3 Measurement
After the test, it shall carry out the following measurements:
- Insulation resistance (see 6.2.2);
- Accuracy (see 6.2.3.1).
6.3.5.4 Acceptance criteria
If the technical specifications do not specify clearly, it may adopt the following acceptance criteria:
During the test:
- Insulation resistance is not less than 100 M???;
- The accuracy is not greater than ?? 2%.
After the test, the pressure transmitter returns to its normal state; its functional characteristics shall not be affected.
6.3.6 Combined influence test of ambient temperature, power supply
voltage, load resistance
6.3.6.1 Overview
The purpose of this test is to determine the deviation of the functional - Static pressure;
- Ambient temperature;
- Power supply voltage.
6.3.7.3 Measurement
Each group of tests shall measure the following:
- Insulation resistance (see 6.2.2);
- Accuracy (see 6.2.3.1).
6.3.7.4 Acceptance criteria
If the technical specifications do not specify clearly, it may adopt the following acceptance criteria:
During the test:
- Insulation resistance is not less than 100 M???;
- The accuracy is not greater than ?? 2%.
After the test, the pressure transmitter returns to its normal state; its functional characteristics shall not be affected.
6.3.8 Over-range test
6.3.8.1 Overview
The purpose of this test is to determine the possible influence of the limited range of tested pressure on accuracy.
6.3.8.2 Test conditions
The influence quantity has its own reference value.
The zero point and sensitivity are adjusted to obtain the maximum operating pressure.
Note: The maximum operating pressure is defined as the maximum pressure that the pressure transmitter can operate after considering the rated zero point and sensitivity adjustment.
6.3.8.3 Test and measurement
According to the different types of pressure transmitters, carry out the following tests, respectively:
6.3.10.1 Overview
This test mainly checks the electromagnetic compatibility (EMC) of the pressure transmitter and electrical connectors during operation through power supply distortion, radio frequency interference, magnetic field interference (see JJG 882). This test does not apply to pneumatic pressure transmitters.
6.3.10.2 Influence of power distortion
6.3.10.2.1 Changes in main power supply
Under the specified load resistance of the pressure transmitter, the power supply makes the following combined changes (that is, 9 sets of measurements for AC power and 3 sets of measurements for DC power), measure the resulting changes in the lower limit and range as follows:
a) Voltage:
1) Nominal value;
2) +10% (or the lower limit as specified in the technical specifications); 3) -15% (or the lower limit as specified in the technical specifications). b) Frequency:
1) Nominal value;
2) +2%, -10% (or the lower limit as specified in the technical specifications). Under low voltage and / or low frequency conditions, it shall carry out one inspection. It shall be determined under the conditions that when the input is the upper limit of the range and the output is not lower than the upper limit of the range.

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