Setpoints - Circ Wtr

Question 1

After taking to start, when does a Cooling Tower Pump Start?

Answer 1

Condenser Inlet opens to 33%, then pump starts. Discharge valves open to:

P-39A - 43%
P-39B - 39%

Question 2

After taking to Stop, when does a Cooling Tower Pump stop?

Answer 2

Pump discharge valve starts to close.
At 33% open, pump will trip off.
Valve continues to close.

Question 3

Cooling Tower Pump start permissives?

Answer 3

Condenser inlet water box full.
Pump Trips Clear
Emergency Stop pushbutton not pushed.
Lubrication water flow > 8 gpm.
Water box inlet valve closed.
Cooling Tower pump discharge valve closed

Question 4

EK 3501/3502, Clg Twr Pump P-39A (B) Hi Temp or Overload setpoints?

Answer 4

167F for bearing

266F for stator

Question 5

EK-3508, Cooling Tower Pump P 39A Lube Low Flow and EK-3509, Cooling Tower Pump P-39B Lube Low Flow setpoints?

Answer 5

18 GPM

Question 6

EK-3530, Makeup Basin Low Level setpoint?

Answer 6

P-39A Basin: 54%

P-39B Basin: 56%

Question 7

Cooling Tower Pump trips?

Answer 7

Overcurrent
Ground Current
Differential Current
Bus Undervoltage

Question 8

Dilution water pump trips?

Answer 8

Undervoltage
Overcurrent
SIAS Load Shed

Question 9

MO-5313, MO-5314, P-40 Discharge to Cooling Tower overload setpoint?

Answer 9

Times out at 116 seconds.

Full stroke should be 60 seconds.

Question 10

MO-5315, MO-5316, Cooling Tower Fill overload setpoint?

Answer 10

Times out at 116 seconds.

Full stroke should be 60 seconds.

Question 11

Cooling Tower Fan Trips?

Answer 11

1) Turbine trip
2) High vibration (local reset)
3) Deluge activation (drain piping) - B onlye
4) Overload (local reset on breaker)

Question 12

CTCS Master Start Fan Control defeats what?

Answer 12

While starting via the Master switch, fans will not trip on main turbine trip.

Question 13

CTCS Init Reset will do what?

Answer 13

Its a warm reboot. Takes around 2 minutes.

Resets PPC alarms
Lamp Test of CTCS
Re-establishes communication with Cooling Towers

Question 14

EK-3330 Cooling Tower E-30B alarm setpoint?

Answer 14

15 psig N2, indicates deluge actuation and fire.

Question 15

EK-3333 (EK-3334) ‘A’ (‘B’) Cooling Twr Basin Level High/Low setpoints?

Answer 15

‘A’ Cooling Tower: high @ 611.17 ft and low @ 609.8 ft

‘B’ Cooling Tower: high @ 610.17 ft and low @ 608.8 ft)

Question 16

MO-5340, MO-5341, MO-5342 and MO-5343, Cooling Tower Bypass Valve open time?

Answer 16

Cooling Tower Bypass valves have a time delay of 250 seconds at the 16.7% open position. Open/closed commands go thru CTCS Node of PPC. Reason for delay is to avoid excess flow to tower basin in too short a time period which could cause an overflow of tower basin.

Question 17

EK-3532 (Dilution H2O Blo-Down Flo High) setpoint?

Answer 17

43,000 GPM

Question 18

When can shutdown cooling be placed in operation?

Question 19

CCW pumps autostart at what?

Answer 19

In standby and 80 psi on header.

Question 20

TIC-0821 controls CCW at what temperature?

Answer 20

72F to 88F

Question 21

CV-0918, T-3 Surge Tank Fill opens and closes on what?

Answer 21

Opens on 47% in CCW Surge Tank

Closes at 74% in CCW surge Tank

Question 22

What CCW valves can be operated post SIAS?

Answer 22

CV-0944A to bypass to restore cooling to SFP. All others need SIAS reset.