CFCU

Question 1

Auto start signal to CFCU

Answer 1

SI
Xfr to S/U
Xfr to diesel

All to slow speed

Question 2

How does leak detection feature in CFCU’s work?

Answer 2

Fan must be in slow, only select one fan at time

• once selected solenoid valve closes on vert run
• when hi lvl alarm comes in start timer
• when hi-hi lvl alarm comes in stop timer and quantify leak rate (<6 min=> …..LR > 0.25 gpm)

Question 3

Purpose of ARRD’s

Answer 3

Backdraft dampers leaked by, allowing fans to rotate in reverse (higher starting current), and robbed important loads cooling====>ARRD installed to prevent fans from rotating in reverse (on motor coupling)

Question 4

How does CCW interface with CFCU’s?

Answer 4

1950 gpm to cooling coils(ATM cooling)

50 gpm to motor cooler (sealed casing to protect and cool motor from harsh environment(accident))

Question 5

Design features/ functions of CFCU’s

Answer 5

Mix CNMT air(H2….radioiodine)( normal vent)
Maintain CNMT air<120 deg(won’t ovrprs cnmt or Damage elec equip)(personnel protection)
Limit Pcnmt < 47 psig(2 CFCU’s & one spray train)
Provide leak indication

Question 6

P.S. to CFCU’s

Answer 6

1-F
2-F
3-G
4-H
5-G