CARDOX

Question 1

When you activate the low pressure CARDOX system locally (break the glass) what are the major drawbacks?

Answer 1

• there is no pre-timer => must ensure no personel are in area because they will have no time to evacuate
• there is no sequence timer => must stay at actuator to turn off CARDOX after appropriate time or whole system will dump into room

Question 2

What are the different ways to actuate the High Press CARDOX system?

Answer 2

• Auto - via temperature switch
• Manual - via control room or remote pushbutton
• Manual - via “grenade” or manual pilot cylinder
• Manual - via local valve manipulation

Question 3

What are some safety concerns of the CARDOX system?

Answer 3

• CO₂ displaces O₂ and can cause suffocation
• CO₂ is very cold and can cause burns

Question 4

What are the areas that the Low Pressure CARDOX system services?

What does the HP CARDOX system service?

Answer 4

• all DG rooms
• Turbine Lube Oil rm
• cable spreading rm
• # 10 Brng
• Generator Purge
• hose reels
• all four CWP

Question 5

A fire occurs in a DG room. The detectors sense the fire and initiate the sequence of events that dump Carbon Dioxide into the room. What is the sequence of events that occur?

Answer 5

The west roll up doors drop and the siren sounds, a time delay occurs, the master actuation valve opens, the local actuation valve opens, CO2 is admitted and the east roll up doors (if open) drop.

Question 6

Which of the following is the correct order to reset the LP Cardox after a D/G room actuation by a local T handle switch?
1) Reset the lockout handle on the main cardox panel
2) Reset the pushbutton inside the main cardox panel
3) Reset the pushbutton at the local fire panel

Answer 6

3,1,2

Question 7

If DC control power is lost to the low pressure cardox system, what is available?

Answer 7

Only manual actuation is available

Question 8

List the sources of CO2 that can be used to purge the main generator

Answer 8

Cardox storage tank(normal supply)
CO2 bottles (emergency supply)

Question 9

Purpose of the HP cardox at intake

Answer 9

To suppress the fire in the CWP to protect atleast one ASW pump and exhaust fan

Question 10

For the HP cardox how many bottles are used in the initial discharge and extended discharge and for how long is the discharge?

Answer 10

Initial discharge is 5 bottles with high flow for 20 seconds
The extended discharge is 6 bottles with low flow for 20 additional minutes

Question 11

ECG 18.5.1 LP CO2 System minimum rank level and pressure

Answer 11

> = 50%
=250psig

Question 12

Actuation reset sequence

Answer 12

Local reset(in area of actuation)
Lockout reset(near the CO2)
Common reset (in lockout panel)
Verify timer reset
Reset pressure alarm(in area of actuation)

Question 13

What happens when a hose is removed from its hose reel cradle?

Answer 13

Red indicating light goes out
Bleeder valves open to vent air from piping
Master valve opens to charge All hose real stations