Circ Water

Question 1

How is CW used as a backup for Fire Protection

Answer 1

• Fire truck or pump skid
• Suction hose dropped into canal
• Pump to fire header

Question 2

What is drained/ returned to the CW Canal

Answer 2

• Cond Demins Lo TDS Sump
• SP Filter backwash sumps
• Yard Area Sump
• TB roof drains

Question 3

Where is CW Makeup and Blowdown controlled from

Answer 3

• WRF control room

Question 4

What is the makeup rate to the CW canal

Answer 4

• 18,000 gpm from evaporation
• 2,000 gpm for blowdown
• 20,000 gpm total

Question 5

What is the blowdown rate for CW, why do we blowdown, and where is it sent

Answer 5

• 2000 gpm
• Prevent excessive accumulation of solids
• Evap ponds

Question 6

How many Fans are there per cooling tower

Answer 6

16

Question 7

How are cooling tower fans Indicated, how are they controlled

Answer 7

Indicated - PMUX

Controlled - PMUX, can operate brkrs locally

Question 8

Which Cooling Tower fan trip is bypassed while starting

Answer 8

• High Vibration trip

- Bypassed for 30 seconds

Question 9

How do you determined if a cooling tower fan tripped due to high vibration

Answer 9

• Locally checked at breaker

- Blue light indicates vibe trip

Question 10

What are the power supplies for the CW pumps

Answer 10

A & B - NAN-S01

C & C - NAN-S02

Question 11

What permissives does a running CW pump provide

Answer 11

• Acid Injection
• Chlorine Injection
• Tower Blowdown vlvs

Question 12

What are the CW pump Start Interlocks

Answer 12

• Water Box outlet MOV Open

- Pump disch MOV Closed

Question 13

How long does it take vlvs to cycle in the CW system

Answer 13

Pump Disch. - 30 Seconds

Water Box Outlet - 60 Seconds

Question 14

What is CW vlv logic for starting the First CW pump in a loop

Answer 14

• Pump starts

- MOV opens to 44%

Question 15

What is CW vlv logic for starting the Second CW pump in a loop

Answer 15

• Pump starts
• Associated MOV goes to 44%
• 3 minute delay
• associated MOV goes full open
• 1st MOV goes full open

Question 16

What is CW vlv logic for stopping the First CW pump in a loop

Answer 16

• Disch MOV goes to 8%
• Pump Trips
• Disch MOV goes fully closed
• 2 Minute interlock prevents restart
• IF x-tie not open OR only 1 pump in opposite loop 2nd
  disch MOV will go to 44%

Question 17

What is CW canal level Normal, Min levels and why

Answer 17

CW pump minimum - 18’
PW pump minimum - 19’
Normal level - 22’3” - 23’3”

• Prevents short circuiting tower air flow

Question 18

What are the CW pump limits for CW towers in/out of service

Answer 18

3 Towers - 4 pumps running
2 Towers - 2 pumps running
1 Tower - 1 pump running

Question 19

What off normal condition other than normal trouble alarm conditions will also cause a CW Sys Trouble alarm

Answer 19

CW-UV-11 x-tie vlv not in AUTO