Why must hydrogen pressure be less than 8 PSIG in this lineup?
prevents hydrogen from escaping through the seals
When generator hydrogen is less than 5 psig, and the gen seal oil system is operating, what occurs?
seal oil float trap bypass must be opened to prevent flooding the main generator internals with oil
Plant at 30%
Gen core mon level hi
Reads 35%
Depress “Filter” PB
What action is the crew required to take?
manually trip turbine if reading returns to normal when the “FILTER” button is pressed
Identify what would likely cause a high level in the hydrogen detraining tank.
drain side float trap is stuck closed
How should you re-initiate TPCCW flow to the coolers as you start up the system?
initiate flow slowly. Prevent thermal cycling of HX components
Main seal oil pump and emergency seal oil pump have tripped. What is the max allowed hydrogen pressure in the generator?
8 psig
When purging the main generator of hydrogen, why is CO2 used as an intermediate gas, instead of purging directly with air?
hydrogen and CO2 do not create an explosive mixture
At what main seal oil pump discharge pressure will the generator emergency seal oil pump auto start?
105 psig
What statement best defines the purpose of the main generator seal oil system?
maintains main generator hydrogen pressure and purity by keeping hydrogen from leaking out and air from leaking in
Why is there a CO2 connection into the main generator machine gas supply headers?
to provide for purging out the air or hydrogen within the generator casing to prevent combustible mixture from existing in the generator
What function does the emergency seal oil pump have?
provides emergency backup to supply oil to the main generator seals on a loss of main seal oil pump discharge pressure
What would cause the emergency seal oil pump to auto start?
main seal oil pump stopped or low main seal oil pump discharge pressure
The main generator core monitor:
provides indication of main generator overheating by monitoring for products of decomposition
The seal oil float trap is bypassed to prevent which of the following?
flooding the main generator internals with lube oil
What is the purpose of the aux detraining section of the turbine lube oil system?
remove hydrogen from the oil prior to its return to the turbine lube oil reservoir
100% power
GEN CORE MONITOR LEVEL HI alarm
local trace shows rapid drop from 90% to 5%
PEO presses “FILTER”
Reports trace returned to 90%
What action is required to take?
trip reactor and go to E-0 since indication of generator overheating exists
