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30 Cards in this Set
- Front
- Back
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Narrow Range Level
Range and Calibration |
Reactor Safeguard and Feedwater control inputs
– 0 to + 60, Calibrated 1045psig and 135°F in Drywell |
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Wide Range Level
Range and Calibration |
Level indication for loss of FW, RPV inventory loss, and ECCS initiation
-150 to +60, Calibrated 1045psig and 135°F in Drywell |
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Upset Range Level
Range and Calibration |
to follow abnormal rises in RPV level
0 to +180 for normal operation, rescaled 0 to +500 for refueling, Calibrated 1045psig and 117/135°F in Drywell. |
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Shutdown Range Level
Range and Calibration |
Level indication when reactor is shutdown in a COLD condition
0 to 370 rescaled 0 to +500 for refueling, calibrated for 0 psig and 120°F in RPV and 80°F in Drywell. |
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Fuel Zone Range Level
Range and Calibration |
LOCA level indication
-100 to -350, calibrated for 212°F in RPV and Drywell. |
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Non-Calibrated Jet Pump Flow
Range |
All Jet Pumps have a pressure tap on the throat which is compared to the Below Plate Core Pressure to provide a DP, the square root of this DP gives a signal that represents flow.
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Calibrated Jet Pump Flow
Range & Failure Modes |
#5, #10, #16(Unit 1)/#15(Unit 2), #20
Flow is measured from pressure taps at the Jet Pump throat and diffuser sections Calibrated pump flow is displayed in MCR and used to calibrate other Jet Pumps |
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Jet Pump Loop Flow
Range |
All 10 Jet pump flows are are summed together to provide a Recirc Loop flow signal.
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Core Flow
Range |
0 to 100 Mlb/hr
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Core Plate Differential Pressure (DP)
Range |
0 to 30 psid
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Wide Range Pressure
Range |
0 to 1200 psig
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Wide Range (PAMS)
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0 to 1500 psig
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Narrow Range
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900 to 1100 psig
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Narrow Range RPV Level
Normal Full Power Values |
+35"
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Wide Range RPV Level
Normal Full Power Values |
+ 35"
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Upset Range RPV Level
Normal Full Power Values |
+ 40"
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Shutdown Range RPV Level
Normal Full Power Values |
Low
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Fuel Zone Range RPV Level
Normal Full Power Values |
Off scale - high
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RPV Pressure
Normal Full Power Values |
1045 psi
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Jet Pump Loop Flow
Normal Full Power Values |
50 Mlbm/hr
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Core Flow
Normal Full Power Values |
100 Mlbm/hr
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Calibrated Jet Pump Flow
Normal Full Power Values |
5 Mlbm/hr
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Core plate Differential Pressure (DP)
Normal Full Power Values |
16 psid
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Leak in reference leg
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Weight of fluid in reference leg drops due to reduction in water density.
Transmitters "sees" lower DP (variable leg versus reference leg). Indicated RPV level goes up. |
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Leak in variable leg
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Excess flow check valve closes
Variable leg drains Indicated level lowers |
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Equalizing valve open
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Equalizes pressure across transmitter
Reference leg level will drain down to variable leg level Indicated level rises |
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Hole in detector diaphragm
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Diaphragm no longer senses DP
Indicated level rises |
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Operation at low Reactor Vessel temperatures on instruments calibrated hot
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Narrow, Wide, and Upset Ranges are calibrated for Hot conditions.
At lower temperatures, water is more dense. A set column of cold water will yield a higher DP as the same column of hot water. If indicated RPV level remains constant as temperature drops: Actual RPV level must have lowered In Cold Shutdown, an actual RPV level of +45 inches will read +60 inches on Narrow Range instruments. |
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Operation at high Reactor Vessel temperatures on instruments calibrated cold
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Shutdown Range is calibrated for cold conditions.
Effects are opposite those for Narrow Range. Shutdown Range will indicate a lower than actual RPV level during hot conditions. |
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Elevated Drywell temperatures
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Effects are similar to reference leg flash.
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