Stator water

Question 1

Auto start setpoint of the standby stator water pump

Answer 1

<20psid across the other pump

Question 2

Power supplies of stator water pumps

Answer 2

1B 134Z

1A 133Y

Question 3

If one GC HX OOS, what actions required?

Answer 3

Reduce turbine power <75%

Question 4

What cools the GC heat exchangers?

Answer 4

WS

Question 5

Stator water DP limits in order

Answer 5

All measured across stator except auto pump start across pump.
32# Hi DP alarm
28#Normal DP
22# Low flow annunciator
20# Gen trip armed no alarm (arms 45 second timer), pump auto start (DP across pump)
18# Lo-2 flow alarm window annunciator
16# Gen trip in 45 sec if connected to grid

Question 6

Stator water conductivity details

Answer 6

High alarm 5.0 umhos
HIHI 9.5 umhos, if confirmed on local panel, manually trip turbine if P-8 trip reactor
If >1.5 umho swap to standby demin

Question 7

What does auto start light mean at pump control switch?

Answer 7

Auto start” signal and status light will energize on the opposite train pump whenever D/P across the respective train pump is < 20 psid

Question 8

Location of temperature, conductivity, pump D/P, other instruments

Answer 8

Inlet and outlet temp alarms of stator, D/P across filter, pumps, stator and demins, Conductivity at outlet of HXs (important one) and after demins.