EO1 B2 SEAL OIL Flashcards
The Main Generator has been purged and contains air. Which ONE of the following describes how
Hydrogen is normally prevented from entering the casing under these conditions?
A. The casing is kept pressurized to 100 psig to preclude a b.P for entry of Hydrogen.
B. The Hydrogen line is disconnected and vented at its supply at the Hydrogen trailer.
C. The spool piece is removed from the Hydrogen supply line and the supply line is blank flanged.
D. A freeze seal is placed on the Hydrogen supply line to prevent leakage of Hydrogen into the
casing.
C
The system prevents hydrogen leakage to the atmosphere and exciter housing.
A. Turbine Building Ventilation
B. CO₂ storage
C. Seal Oil
D. lsophase Bus Cooling
C
The purpose of the Seal Oil system is to prevent leakage to the atmosphere or to the
A. hydrogen; exciter housing
B. CO2; generator casing
C. nitrogen; generator casing
D. CO2; exciter housing
A
The Main Seal Oil Pump NORMAL pressure regulator is set such that oil pressure is psig
than generator hydrogen gas pressure.
A. 8, less
B. 5, less
C. 8, greater
D. 5, greater
C
Which ONE of the following describes the source of oil supply to the Seal Oil Vacuum Tank during
NORMAL power operations?
A. Air detraining tank
B. Seal Oil Makeup Pump
C. Hydrogen detraining tank
D. Turbine Lube Oil Bearing supply header
D
The plant is operating at 100% power.
The ZONE 2 Operator calls to report that there is no oil level indicated in the Hydrogen Detraining
Section Float Trap sightglass.
Which ONE of the following describes the effect of operating with this condition present?
A. This is a normal condition
The Seal Oil system will operate normally
B. The Generator will rapidly depressurize through the Seal Oil system A Control Room annunciator
will alarm
C. The Generator will rapidly pressurize due to direct connection to the Seal Oil supply header A
Control Room annunciator will alarm
D. The Generator will reach equilibrium pressure at approximately 55 psig due to holes drilled in
the Seal Oil supply valves, H22 and H46
B
The Main Seal Oil Pump NORMAL pressure regulator is set such that oil pressure is psig
than generator hydrogen gas pressure.
A. 8, less
B. 5, less
C. 8, greater
D. 5, greater
C
Which ONE of the following describes the source of oil supply to the Seal Oil Vacuum Tank during
NORMAL power operations?
A. Air detraining tank
B. Seal Oil Makeup Pump
C. Hydrogen detraining tank
D. Turbine Lube Oil Bearing supply header
D
Which ONE of the following indications is displayed in the Control Room? (DO NOT consider computer
points.)
A. Pl 2517, Seal Oil Filter outlet pressure
B. Pl 2458, Seal Oil Vacuum Tank pressure
C. Pl 2397, Main Seal Oil Pump discharge pressure
D. Pl 2466, Generator End Seal Oil supply pressure
A
The pressure indicators for the Turbine End and Generator End Seal Oil supply are located
A. in the Seal Oil room.
B. in the Control Room.
C. in the Exciter Cabinet area.
D. in the Turbine Generator skirt.
D
At 90 psig decreasing on the discharge of the Main Seal Oil pump, the Seal Oil Pump will
automatically start.
A. Auxiliary
B. Back Up
C. Emergency
D. Recirculating
C
The plant is operating at full power when the following annunciators alarm:
- 16-1-H, ESOP ON
- 16-2-H, SEAL OIL L’:.P LO
- 16-4-H, SEAL OIL VAC TK LVL
Which ONE of the following would be a correct cause for this combination of LIT alarms?
A. Float trap H58 failed OPEN
B. Recirculating Seal Oil pump shaft seizure
C. Pipe break between H18, Normal Seal Oil Regulator Inlet Isa, and Pl2397, Main Seal Oil Disch
Pressure indicator
D. H22, Seal Oil Supply to Turbine End Seal, and/or H46, Seal Oil Supply to Generator End Seal are
manually CLOSED
C
Match the Seal Oil System component listed in the left column with its corresponding statement from
the right column.
- Hydrogen Detraining Section
- Seal Oil Vacuum Tank
- Recirculating Seal Oil Pump
- Main Seal Oil Pump
A. Auto start at 90 psig decreasing.
B. Relief valve provided at 105 psig back to the seal oil vacuum tank.
C. Drains directly to the turbine bearing oil drain header.
D. An attached liquid detector provides an alarm in the CTRM.
E. Provided with a spray manifold.
F. Provides motive force for stripping vapors from the seal oil.
1/D
2/E
3/F
4/B
The plant is in a startup at 20% power with 50 MWe being generated.
BOTH the Main and Emergency Seal Oil pumps have been damaged by a dropped piece of angle iron. Seal
Oil can
A. be supplied from the Turbine Bearing Oil supply header but NO MWe can be generated due to the
low supply pressure.
B. be supplied from the Recirculating Seal Oil pump but NO MWe can be generated due to the low
supply pressure.
C. be supplied from the Recirculating Seal Oil pump and power escalation may continue.
D. be supplied from the Turbine Bearing Oil supply header and power escalation may continue.
A
