Non-essential service water

Question 1

Purpose of WS system

Answer 1

Provides cooling water loads which are not safety related and not essential to the safe shutdown of the plant. Also supplies water for chem add system, CW pump seals and CW pump oil coolers.

Question 2

Main generator load limit:
Hydrogen cooler OOS
GC cooler OOS

Answer 2

With 1 hydrogen cooler OOS, limit load to 80% of rated.

With 1 GC cooler OOS, limit load to 75% of rated.

Generator rated at 31, 431 amps.

Question 3

WS pumps are placed in _______ if the _______ bus is to be re-energized from ESF bus.

Answer 3

PTL; non-ESF

Question 4

If there are no WS pumps running ______

Answer 4

Trip both units.

Question 5

Power supplies:
0A
0B
0C

Answer 5

143, 144, 243

Question 6

WS pump trips (4)

Answer 6

Phase overcurrent
Ground OC
Low bus voltage
Emergency trip PB on MCB

Question 7

Auto start of WS pump occurs at _____ and header pressure low alarm at ____. Header pressure is normally _____.

Answer 7

75 psig; 80 psig; 100 psig

Question 8

Strainer delta P high alarm, after a backwash, if the CS is in _____ and delta P is still ______, the ________ alarm will actuate. Will also alarm when ______ of backwash.

Answer 8

Auto
11 psid
WS STRN DELTA P HIGH alarm
4 minutes

Question 9

Capacity of the WS pumps is _______.

Answer 9

35,000 GPM each

Question 10

Main turbine bearing lower temperature limit ______

Answer 10

70F

Question 11

Loads on the WS system: (24)

Answer 11

Heating steam boiler pumps
Sec sample cooler
Main turbine oil coolers
Heater drain pumps
Cond pump oil cooler A, B, C, D
Cond booster pump oil cooler A, B, C, D
Gear pump oil cooler A, B, C, D
Aux building HVAC refrig 0A, B, C
Computer room HVAC
Blowdown condenser
SD sample coolers
Aux steam vent condenser
Stator coolers
ASSO cooler
HSSO cooler
Bus duct coolers
Exciter coolers
Generator hydrogen cooler package
EH fluid coolers
Turbine FWP oil coolers
Motor FWP oil coolers
SU FWP oil coolers
Primary vacuum pump coolers
Hogging vacuum pump coolers