Generator Gas Control - 1.0 Flashcards
How many hydrogen storage banks are in the Generator Gas Control System?
Active supply – 6 bottles
Active Reserve Supply – 3 bottles
Emergency Reserve Supply – 3 bottles
What are the pressure setpoints for the Generator Gas Control System?
Pressure (Norm) 75 psig
Pressure (Alarm) 72 psig
Pressure (Min) 63 psig
What are the purity setpoints for the Generator Gas Control System?
H2 Purity (Norm) 96.5%
H2 Purity (ESOP Band) 90-92%
H2 Purity (Min) 75%
What is the purpose of maintaining H2 purity above the minimum setpoint? What is the minimum setpoint?
H2 Purity is maintained > 75% to ensure it remains above the upper explosive limit
What are the vaporizer trips?
High Temp Cutoff – 300F – Deenergizes heaters
Low Temp Cutoff – 50F – Inlet Closes
What is the order we purge the H2?
H2 > CO2 > Air
the same in reverse for putting H2 back into the generator
What is the purpose of the Generator Core Monitor and what does it do?
Detects Localized Hot spots
Driven by D/P of shaft mounted fans, it activates the pyrolysate collector upon indication of localized generator overheating and collects decomposition products for subsequent analysis.
How does the Generator Gas Control system limit the effects of a H2 pipe break?
Use of an excess flow station
How do you know if there is oil or water intrusion into the Generator Gas Control System?
Liquid detectors fed by low point gravity drains have level switches and sight glasses.
Why is H2 used in the Generator Gas Control System?
It has a much higher thermal conductivity than air.
It is much less dense than air thus reducing frictional losses (less windage).
What are the potential effects of operating with low hydrogen pressure?
Overheating
Water intrusion
Where can we monitor H2 purity in the MCR?
10C650E
