Misc 126 Flashcards
Why are the H2 coolers on the 176 foot of the turbine building cracked open?
Keep air out since it is the system high point
At what pressure does the standby TCW pump start at?
55 psig on the header
What indications do you expect on the TCW surge tank?
- Level approx. 46-51”
- N2 pressure around 25-30 psig
What is normal instrument air header pressure?
115 psig
When do we get a low IA header pressure alarm?
95 psig
When does the backup N2 align to the IA header?
At approx 85 psig
What cools the IA compressors and service air compressor?
TCW
If TCW is out, what can cool the IA/SA compressors?
DS
What is the H2 storage bank normally maintained at?
Around 2300 psig
When do we get a low H2 storage bank pressure alarm?
200 psig
When does the emergency seal oil pump auto start?
At approx. 110 psig
How much does H2 purity degrade when we lose a main generator seal oil vacuum pump?
around 2% every 8 hours. Air will continually be absorbed by the seal oil system, migrating through the H2 seal and degrading H2 purity.
In all three units which condenser shell expansion joints are wet?
Only unit 3’s ‘B’ expansion joint
At what pressure is the H2 maintained in the Generator at?
75 psig. You can see it on rounds by the seal oil skid.
How is seal oil maintained in regards to H2?
Around 8 psig greater than H2 pressure.
