Term
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Definition
Forced flow:
•Circulate RCS water transferring heat from Rx core to S/Gs
•Provide energy for RCS heatup to Hot standby
•RCS pressure boundary
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Term
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Definition
•Maintain DNBR during normal ops and transients
Critical Heat Flux
Actual Heat Flux
•Motor Flywheels provide pump coastdown ensuring core cooling during transition to Natural Circulation
•Chemicalmixing maintained during emergency borations
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Term
| Name the Four Major sections of the RCP: |
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Definition
The pump consists of four general areas:
a. Impeller Section
b. Thermal Barrier Section
c. Rotating Assembly and Radial Bearing
d. Seals
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Term
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Definition
Above impeller.
Attached to Thermal Barrier flange.
Turning Vane Diffuser converts velocity head into pressure head.
At the top of the diffuser, the turning vanes direct the upward flow toward the single discharge nozzle.
Diffuser adapter at bottom of impeller prevents back leakage of discharge to pump suction.
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Term
Thermal Barrier
& Heat Exchanger |
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Definition
•Designed to minimize heat transferred to the pump radial bearing and seal package on loss of seal injection.
•40 gpm CCW flow capable of cooling RCS fluid to 140 ˚F
•CCW in this area only really needed on a loss of seal injection
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Term
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Definition
The seal assembly function is to impose pressure breakdown from RCS pressure conditions to ambient, limiting reactor coolant losses to an acceptable minimum.
•CVCS injection
–8 gpm overcomes RCS pressure by 50# at reduced temperature
–
5 gpm flows down along thermal barrier & heat exchanger into RCS.
–Remaining 3 gpm flows upward
•cooling the pump bearing
•then enters #1 seal.
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Term
CONDITIONS REQUIRED TO OPEN 2CV114: |
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Definition
•Seal Outlet Temp approaching 190 ºF AND
All of the following conditions exist:
–RCS 100 – 1000 psig, and
–No. 1 seal leak-off flow rates are < 1 gpm, and
–Seal injection flow to each RCP is ≥ 6 gpm, and
–21-24CV104, Seal Leakoff Valves, are OPEN to prevent seal cocking.
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Term
2CV114 IS TO BE CLOSED WHEN ANY OF THE FOLLOWING CONDITIONS EXIST |
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Definition
–RCS Pressure >1000 psig, or
–RCS Pressure <100 psig, or
–ANY CV104, Seal Leakoff Valve CLOSED, or
–ANY No. 1 Seal Leakoff flow rate is > 1 gpm
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Term
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Definition
NOTE: Excess Letdown Line pressure (PI-121) is indicative of seal leakoff pressure and can help to confirm seal abnormalities
#1 Seal Failure:
Alarms: Seal D/P Low, Stand Pipe Hi, Seal Leakoff Hi/lo
–Lowering seal d/p
–Rising standpipe level (due to increased d/p at #2 seal)
–High seal leakoff flow
–Reduced leakoff for unaffected pumps
–High CC return temperature
–High injection flow
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Term
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Definition
NOTE: Excess Letdown Line pressure (PI-121) is indicative of seal leakoff pressure and can help to confirm seal abnormalities
#2 Seal Failure:
–High standpipe level alarm
–#1 seal leakoff lower
–Increased frequency of RCDT pump runs
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Term
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Definition
NOTE: Excess Letdown Line pressure (PI-121) is indicative of seal leakoff pressure and can help to confirm seal abnormalities
#3 Seal Failure:
–Low standpipe level alarm
–Containment RMS alarms
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Term
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Definition
•6000 HP
–1188 RPM
–Vertical, Air cooled motor
–
Six
pole squirrel-cage induction motor
•Power supplied from: 4 kv Group busses
–11(21)---- ”H”
–12(22)----”E”
–13(23)----”F”
–14(24)----”G”
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Term
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Definition
CVCS water bypass to the #1 Seal:
Provides flow to the bearings when the pressure D/P across seal #1 is too low to provide flow. |
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Term
Where does the CV115 relieve to?
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Definition
| Releaves to the PRT @ 150# to ensure seal return. |
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Term
RCP Start up permissives:
RCP Oil Lift Pumps: |
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Definition
Oil Pump Manual Start: satisfies 28 VDC control circuit
23 RCP started to facilitate RCS pressure control
Need to be in service to start respective RCP
provides >= 500# of pressure to lift the kingsbury thrust bearing. |
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Term
Cause and consequense of loss of cooling to the RCP motor...
Cause and consequense of loss of cooling to the RCP seals... |
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Definition
Motor: Loss of CCW 5 minute shutdown requirement.
Seals: Loss of both seal injection flow and CCW to the thermal barrier results in immediate action to stop the RCP
loss of only one no action needed |
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Term
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Definition
| 4 Pumps = 12.1 MW Thermal |
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