Mn Gen H2 and CO2

Question 1

Why use H2 gas to cool Generator?

Answer 1

Low windage losses - less friction => less heat generated High thermal conductivity - transfers heat well Cheap

Question 2

How many different sources can we supply H2 and CO2 to Generator?

What does H2 system provide gas to?

Answer 2

H2- two, bulk supply, H2 bottles

CO2- two, cardox, CO2 bottles

Generator and cover gas to SCCW head tank

Question 3

Major components and purposes of Generator H2 and CO2 system?

Answer 3

PGA(Generator auxiliary panel)- monitors H2 purity, pressure, flow

GCM(Generator condition monitor)- monitors for insulation breakdown inside Generator

Gas dryer- drys H2 gas to minimize, insulation contamination, shorts, corrosion

Level switches- check for accumulation of liquid in Generator (oil HSS operated incorrectly), leaks in H2 coolers

Question 4

What do you do if you have excess H2 leakage from Main Generator?

What must Generator H2 pressure always be above?

Answer 4

• excess H2 leak-> Trip unit, purge Generator w/CO2
• Generator H2 Press > SCCW Press by 5 #

Question 5

What manifold used to fill Generator with H2? CO2?

Answer 5

H2- filled from top, CO2 drains from bottom, purity measured from bottom CO2- filled from bottom, H2 drains from top, purity measured from top

Question 6

What promotes the H2 gas to flow past the gas dryer?

Answer 6

The d/p caused by the internal fans inside the Generator assisted by gas dryer blowers