Section 3.7.7 Component Cooling Water (CCW) System

Question 1

What is 3.7.7 Component Cooling Water (CCW) System?

Answer 1

During Modes 1, 2, 3 and 4

Two CCW trains shall be OPERABLE

Question 2

What is the Left Train of CCW?

Answer 2

A train is equipment connected to a common safety bus used to transfer heat from loads to SWS via CCW.

LEFT TRAIN

• ‘A’ CCW Pump
• ‘B’ CCW Heat Exchanger
• CV-0911, CCW from Containment
• CV-0938 CCW to Shutdown Cooling Heat Exchangers
• CV-0946, B CCW Heat Exchanger Inlet

Common

• CCW Surge Tank
• CV-0910, CCW to Containment
• CV-0913, CCW to ESS Pumps
• CV-0944, CCW to Radwaste Evaps
• CV-0950, CCW from ESS Pumps
• CV-0977B, CCW from Radwaste Evaps

Question 3

What is Right Train CCW?

Answer 3

A train is equipment connected to a common safety bus used to transfer heat from loads to SWS via CCW.

RIGHT TRAIN

• ‘B’ CCW Pump
• ‘A’ CCW Heat Exchanger
• CV-0940, CCW from Containment
• CV-0937 CCW to Shutdown Cooling Heat Exchangers
• CV-0945, A CCW Heat Exchanger Inlet

Common

• CCW Surge Tank
• CV-0910, CCW to Containment
• CV-0913, CCW to ESS Pumps
• CV-0944, CCW to Radwaste Evaps
• CV-0950, CCW from ESS Pumps
• CV-0977B, CCW from Radwaste Evaps

Question 4

What makes a CCW train operable?

Answer 4

• Its pump must be operable.
• Its Heat Exchanger must be operable
• Its piping, valves, and instrumentation and controls
• required to perform the safety related function are OPERABLE
• T-3 Surge tank and other common components are OPERABLE.

Left Train

• P-52A and E-54B

Right Train

• P-52B and E-54A

Question 5

What happens when one or more trains are inoperable?

Answer 5

72 hours to Restore train(s) to OPERABLE status.

Failure of a common component could render both trains inoperable, yet 100% cooling capable could still be met with no other failures.

i.e. SV-910 can’t be energized, renders both trains inoperable, but with two pumps you can still isolated Evap/SFP loads to feed Safety Loads.

Question 6

When must the shell side of the CCW heat exchangers be in service and why?

Answer 6

Modes 1-4. Shell side in service prevents vibration from excessive flow.

If shell side is isolated to either Heat Exchanger, then both are inoperable.

Question 7

What is the minimum requirement for 100% cooling?

Answer 7

One train supplying only Safety Related loads (ESS Pumps/SDC HT EXCH).

Requires Operable:

• 1 Pump
• Both Heat Exchangers
• CV-911, 910 or 940 (Containment Isolation)
• CV-944A (SFP isolation)
• CV-0944 or 0977B (Evap Isolation)

Question 8

When can SW be isolated to a CCW heat exchanger and 100% cooling still be met?

Answer 8

Required Operable

• CAC 1-3
• 2 spray pumps
• P-52A/B
• 2 SW pumps
• Both SDC Heat Exchangers

AND

• CV-0910, CV-0911 or CV-940 (containment isolation)

AND

• CV-0944A (sfp isolation)

AND

• CV-0944 OR CV-0977B (evap isolation)

Question 9

When can two pumps meet 100% required cooling capability?

Answer 9

Both Heat Exchangers Operable

AND

• One of either CV-0910, CV-0911 or CV-0940

OR

• CV-0944A and CV-0944 or CV-0977B operable

Question 10

What is required with less than 100% required cooling?

Answer 10

LCO 3.0.3