GSC

Question 1

State normal GSC flow to stator and HV bushing

Answer 1

700 GPM to stator

85 GPM to HV bushing

Question 2

State purpose of Pressure Control valve CV-Y-63

Answer 2

Maintains GSC pressure 3# less than H2 pressure

Question 3

State what will auto start standby GSC pump

Answer 3

A pressure switch senses when GSC pump discharge pressure is less than 10# of normal
Another pressure switch will activate at 20# less than normal

Question 4

State GSC runbacks

Answer 4

Stator return temperature high - 80C
Stator supply low inlet pressure - 50#
Stator Coolant flow low - 586GPM
High Voltage bushing flow low - 47GPM

Question 5

State response time and rate of runback

Answer 5

There is a 15 sec TD before initiation

Runback at a rate of 30%/min

Question 6

State Turbine Trip on GSC runback

Answer 6

If after 2 minutes Amps are not <25,000 then Turbine trip

If after 3.5 minutes Amps are not <7,000 then Turbine Trip

Question 7

State action on high-high conductivity

Answer 7

At 9.9 mhos/cm VAS states to trip turbine