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17 Cards in this Set
- Front
- Back
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1. Why is cooling necessary for the Turbine-Generator Bearings?
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Answer: The lubrication minimizes friction, but does not eliminate the friction altogether, therefore some heat is still generated by friction.
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2. How are the torque requirements of the turning gear motor reduced to an acceptable level?
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Answer: The Turbine Bearing Lift Oil System reduces the friction and thereby the torque requirements.
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3. What portion of the Main Turbine Lube Oil System provides for storage and transfer of both clean and dirty lube oil?
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Answer: The Lube Oil Storage, Transfer, and Purification System.
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1. What is the arrangement of the mesh screens in the Lube Oil Reservoir? Why?
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Answer: There are four removable mesh screens. Two screens can be removed for cleaning while the other two screens are left in place. This allows for the screens to be removed and cleaned during Lube Oil System operation.
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2. What method is used to reduce the risk of spraying high-pressure oil onto hot turbine parts?
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Answer: Guard piping, the supply line is contained within the return line as a "pipe-in-a-pipe".
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1. What type of driver provides motive force for the Booster Lubricating Oil Pump?
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Answer: An oil turbine provides the motive force for the Booster Pump.
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1. When performing STN AC-004, Attachment B, to test a Lift Pump, why is it necessary to "arm" the Lift Pump after depressing the test pushbutton?
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Answer: The test pushbutton operates a solenoid valve that physically bleeds pressure from the pressure switch at the suction of the Lift Pump. Suction pressure must be maintained greater than 1 psig in order for the Lift Pump to remain "armed".
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2. Once a Lift Pump has been "armed", what will cause the Lift Pump to "dis-arm"?
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Answer: Any of the following things will cause a Lift Pump to "dis-arm": opening of the associated pump's breaker, control power fuses, thermal overload contacts, or the Lift Pump's low suction pressure.
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1. During cold weather conditions, why is it especially important to monitor lube oil temperatures?
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Answer: Because the Service Water System provides the cooling medium for the Main Lube Oil. During cold weather conditions the Service Water temperature is relatively low, such that slight changes in the position of the temperature control valve could cause rapid changes in the lube oil temperature.
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2. What is the power supply to the Emergency Bearing Oil Pump (DPCB05)?
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Answer: PJ0104.
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1. If the Lube Oil Vapor Extractor Blower trips on high temperature of 150 degrees Celsius, how does one reset it?
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Answer: The temperature switch should reset automatically when it drops down to 135 degrees Celsius, and the blower should re-start, assuming the handswitch has been left in "RUN".
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1. Assuming that you are the Turbine Watch on rounds in the Condenser Pit, when you notice a small stream of oil running down the east side of the Main Condenser, what actions should you take?
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Answer: Immediately notify the Shift Manager and then, if it is safe to do so, try to determine the source of the leak and whether it can be isolated.
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2. What are the possible sources of lube oil in the Turbine Building that could pose a risk of a large leak or spill?
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Answer: Main Lube Oil Reservoir, Clean Oil Storage Tank, Dirty Oil Storage Tank, SGFWP Lube Oil System.
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1. What risk could develop as a result of water accumulation in the Main Lube Oil System?
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Answer: Water in oil can cause formation of sludge, which can clog flow paths in a lubricating system. This could result in inadequate lubrication and destruction of bearing surfaces or moving parts.
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2. How can you, as a Turbine Building Watch, reduce the chances of a high vibration, induced turbine trip, as related to the Main Lube Oil System?
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Answer: As the Turbine Building Watch, one must be constantly aware of the lube oil temperature to the bearings. One must also remember factors that can affect said temperature, such as Service Water temperature (lake temperature), position of temperature control valve, load on the turbine, and ventilation line-up.
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3. What tools and/or techniques are available for use at WCGS to prevent these type events?
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Answer: QV&V, Peer Checking, Self-Checking, etc.
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4. How could there be water intrusion into the Main Lube Oil System?
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Answer: Steam and water could enter at the seals and gain access to the Lube Oil System. Other sources include contamination by tube leakage in an oil cooler.
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