Self Study (EFW, Condenser, Generator)

Question 1

What are entry conditions for EFW actuation with Low OTSG Pressure?

Answer 1

EFW feed is required due to Loss of DH, Loss of OTSG feed or Loss of all RCPs with pressures below 900 psig

or

Any automatic EFW actuation with OTSG Pressure below 900 psig

Question 2

What are the major actions performed in EFW Actuation with Low OTSG Pressure?

Answer 2

• If automatic EFW actuation occurs with EFW flow oscillations then place EFW control valves in hand and throttle to stop oscillations and maintain total flow to either SG below 1800 gpm.

If manual control of EFW required then ensure all EFW Isol valves open and place all EFW control valves in hand and close, start EFW pumps and maintain total flow < 1800 gpm to either SG.

Question 3

What are entry conditions for Exceeding thermal limits on condenser?

Answer 3

Instantaneous Max - Condenser CW outlet temp or avg circ water outlet temp > 110 deg greater than 1 hour

Max Daily Avg - Condenser outlet temp > 105 deg F for greater than 48 hours

Question 4

What actions are taken if instantaneous max condenser outlet temp reached?

Answer 4

Prior to daily avg of circ water temp outlet reaching 110 deg F conduct bridge call and if necessary reduce plant load.

Question 5

What actions are taken if instantaneous max daily average reached?

Answer 5

Initiate steps to determine and correct cause, and initiate CR to document and aid in determination of need to reduce load if daily avg exceeds 105 deg F for 7 days in calendar month.

Question 6

What are entry conditions for main generator winding trouble?

Answer 6

Question 7

What actions are taken in main gen winding trouble if a generator problem is confirmed by 2 or more indications (other than gen radio requency arc monitor)?

Answer 7

Perform RPSD to gradually reduce load to return within limits and record readings on att A (Gen vibration log) hourly untial all readings ar ewithin limits and stable.

Question 8

What does the radio frequency arc monitor look for?

Answer 8

provides indication of arcing from the neutral of the main turbine generator to the low voltage windings on the main or Unit Aux Transofmers. Due to the nautre of the signals, an inherent limitation of this device is it cannot distinguish the origin of the RF signal and will also respond to background noise.

Question 9

Which instrument should the most confidence be put in when evaluating the possibility of generator damage and what indications should be present for field grounds?

Answer 9

TR-9001

An occurrence of field grounds would cause localized heating of the rotor due to greater thermal imbalance resulting in higher rotor viration and greater heat load on the generator H2 gas system.