Component Cooling Water

Question 1

What is the purpose of CCW?

Answer 1

• Removes heat from various HX’s, pumps, and miscellaneous loads.
• Provides support to ESF systems.
• Serves as an intermediate barrier between the RCS and ESW.

Question 2

What is the corrosion inhibitor used in the CCW system?

Answer 2

Sodium Molybdate

Question 3

What are the CCW Pump Auto-Starts?

Answer 3

• Operating pump discharge # < 80#
• SI sequence
• Load Shed sequence

Question 4

What are the CCW Pump Auto-Starts with the switch in Neutral?

Answer 4

• Load Shed sequence
• SI sequence

Question 5

What are the CCW pump Trips?

Answer 5

• Load Shed
• Overload
• Overcurrent

Question 6

CRV-412 (Surge Tank Vent) Auto Closes on?

Answer 6

High Radiation in the CCW system.

Question 7

What is the normal CCW flow through the RHR HX’s and what does it throttle to on SI?

Answer 7

• Normal: 5000gpm when RCS >200F
• SI: Throttle to 3000gpm

Question 8

When does CRV-470 (CCW from Letdown HX) auto close and what is special about it?

Answer 8

• Auto close on SI
• Once SI is reset, the valve controller must be run to minimum output to reset the valve.

Question 9

What is the sequence loading time for CCW pumps on a LOOP WITHOUT SI?

Answer 9

About 3 seconds after the EDG is ready for loading

Question 10

What is the sequence loading time for CCW pumps on a LOOP WITH SI?

Answer 10

About 15 seconds after the EDG is ready for loading

Question 11

What is the sequence loading time for CCW pumps on SI?

Answer 11

• Running pump stays running.
• Standby pump sequences on the RAT about 15 seconds after SI signal.

Question 12

What are the high and low Surge Tank Level Alarms?

Answer 12

• High: 148in
• Low: 42in

Question 13

What is the correlation in gallons/in for the Surge Tank?

Answer 13

70 gal/in

Question 14

What are the CCW Safeguards Loads?

Answer 14

• RHR HX
• RHR Pump Seal HX
• CTS Pump Seal HX
• SI Pump LO Cooler and Seal HX
• CCP LO Cooler and Speed Increaser

Question 15

What are the CCW Miscellaneous Loads?

Answer 15

• SFP HX
• Letdown HX
• Excess Letdown HX
• RCP LO and Thermal Barrier HX
• RCP Seal Water HX
• CEQ Fan Motor Air Coolers
• WGC
• RX Vessel Support Coolers
• Containment Penetration Coolers
• Sample HX’s
• NBAE
• MS Penetration Coolers
• Reciprocating CCP
• Hydrogen Monitor
• PACHMAS

Question 16

What happens in the CCW system on a Containment Phase A?

Answer 16

• SFP HX isolates
• Excess Letdown HX isolates
• RX Support Cooler Isolates
• NBAE isolates

Question 17

What happens in the CCW system on a Containment Phase B?

Answer 17

• RCP Cooling Isolates (Thermal Barrier and LO Coolers)
• Requires manual trip on the RCP’s in 3 minutes

Question 18

What happens in the CCW system on an SI?

Answer 18

• CCW HX Outlet opens
• CCW Outlet for RHR HX’s throttle to 3000-3500gpm
• ESW to CCW HX throttles to 5000gpm
• Letdown HX Isolates

Question 19

What are the CCW Pump power supplies?

Answer 19

• West CCW Pump: T11(21)A
• East CCW Pump: T11(21)D

Question 20

How tall is the baffle plate in the Surge Tank?

Answer 20

• 5 feet
• 48” indicated

Question 21

What is the purpose of the Surge Tank baffle plate?

Answer 21

Provides train separation and redundancy for passive failure during recirculation phase of a LOCA.

Question 22

What is the fail position for CRV-410/411? (Demin water makeup valves)

Answer 22

Fail Closed on a loss of air and control power

Question 23

What is the purpose of the RCP Thermal Barrier Safety Valve?

Answer 23

Lifts at 2485#
Allows for controlled shutdown.

Question 24

What happens in the CCW system when containment pressure reaches 1#?

Answer 24

CEQ fan motor cooler CIV’s open

Question 25

What does CMO-410/420 (CCW HX Outlet Valves) throttle to on an SI signal?

Answer 25

Full Open

Question 26

Why is there one supply line to the RCP’s from CCW and two return lines from the RCP’s to CCW?

Answer 26

So the thermal barrier can be isolated if it’s leaking from the RCS.

Question 27

Why don’t the Main Steam Penetration Cooler CCW CIV’s close on a Containment Phase A?

Answer 27

The Main Steam Stops don’t close on a Containment Phase A, therefore they still have steam going through them.

Question 28

If a load on the Miscellaneous Header is isolated, is the CCW system still OPERABLE?

Answer 28

• YES
• The CCW system can still perform its safety function.

Question 29

If a load on the Safeguards Header is isolated, is the CCW system still OPERABLE?

Answer 29

• NO
• The equipment on the safeguards header are required safety functions.
• Also (depending on the load) minimum CCW flow may not be achievable during the injection phase.