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5/12/2018 7505_H.M. Hashemian_PM - slidepdf.com
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Advanced I&C
On-line Monitoring and Calibration
Techniques in Nuclear Power Plants
Prepared by:
H.M. Hashemian, PresidentAnalysis and Measurement Services Corporation
AMS Technology Center
9119 Cross Park Drive
Knoxville, Tennessee 37923
USA
Presented at:
International Conference onOpportunities and Challenges
for Water Cooled Reactors in 21st Century
Vienna International Centre
International Atomic Energy Agency
Vienna, Austria
27-30 October 2009
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Do Not Forget Sensors and Cables
2H.M. Hashemian
Process
TemperatureSensor
PressureTransmitter
Cables
Cables
Penetration
I&C Cabinets(Analog or Digital)
Control Room Area(Mild Environment)
Containment(Harsh Environment)
~150 meters
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Proper Installation is Critical toTemperature Sensor Performance
3H.M. Hashemian
0
4
8
12
R e s p o n s e T i m e ( s e c )
Thermocouple Tag Number
DWM139B-01A
0
1
0 10 20 30 40 50 60
Time (Sec)
S t e p R e s p o n s e
Fast - Good
Slow - Bad
RTD
Thermocouple
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Nuclear Power Plant Pressure TransmitterFailure Mode Detected by Pure Luck
4H.M. Hashemian
80
90
100
110
120
9:30 AM 10:00 AM 10:30 AM 11:00 AM 11:30 AM 12:00 PM 12:30 PM
R C S F l o w ( % )
Time
JPF025B-04
FT-445
FT-444
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Sensing Lines are Critical to thePerformance of Pressure Transmitters
5H.M. Hashemian
Process Pipe orVessel
CondensatePot
Vent
ThermalInsulation
Rootvalve
Shield Wall
Penetration
AccessibleIsolation Valve
Transmitter
PrimaryContainment
Wall
RestrictionDevice
Check Valve
~ 50 meters
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Cable Diagnostics
1 2 3 4
RTD
-0.5
0
0.5
-200 0 200 400 600 800 1000
1,2
2,3
3,4
Distance (Feet)
6H.M. Hashemian
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Signal Problems are Not Always inCables
CurrentMeter
N e u t r o n s
CurrentVoltageSource
+
NeutronDetector
7H.M. Hashemian
-
I – V Test
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MaintenanceClasses
PredictiveMaintenance
Methods that useData from TestSensors
PredictiveMaintenance
Methods that useData from ExistingProcess Sensors
PredictiveMaintenance
Methods Based onActive MeasurementSignals
Detection ofFouling of
Venturi FlowElements
Detection ofSensing Line
Blockages
InstrumentCalibrationVerification
Loose PartsMonitoring
LeakageMonitoring
VibrationMeasurement
SensorInstallationVerification
SensorResponse Time
Testing
Cable ConditionMonitoring
Conventional and Advanced PredictiveMaintenance Technologies
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Plant Implementation of On-LineCalibration Monitoring
H.M. Hashemian 9
PlantComputer
Data
Status of Plant Instrumentation
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Plant Startup and Shutdown Data
10H.M. Hashemian
0
10
20
30
40
50
60
70
80
90
0 500 1000 1500 2000 2500
P r e s s u r e
Time (Minutes)
Startup Data KDL204A-01
0
10
20
30
40
50
60
70
80
90
0 300 600 900
P r e s s u r e
Time (Minutes)
Shutdown Data KDL204A-02
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On-Line Calibration Monitoring Results Coveringthe Full Operating Range of a Transmitter
11H.M. Hashemian
-1.0
-0.5
0.0
0.5
1.0
7.5 20 30 40 50 60 70
Operating Point (%)
+ (ALLOWABLE CALIBRATION LIMIT)
- (ALLOWABLE CALIBRATION LIMIT)
CRS038B-01
D e v i a t i o n
( % )
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Conclusions and Recommendations
• Do not forget the sensors, process-to-sensors interfaces, cables,connectors, and penetration
• The validity, accuracy, and fidelity of process signals depends onproper installation of sensors and flawless cables and connectors
• On-line monitoring techniques and in-situ test methods are now
mature enough for ready use in nuclear power plants
• Regulators have approved the OLM concept to verify the calibrationof nuclear plant pressure, level, and flow transmitters
• U.S. plants are applying for generic NRC licensing to implement
OLM for online calibration monitoring of pressure, level, and fortransmitters
• Research is needed to establish the uncertainty of modelingtechniques for on-line calibration monitoring applications
H.M. Hashemian 12
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Thank You
13H.M. Hashemian
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