LOT 201.12 CCW

Question 1

• LOT 201.12 CCW*
• • *

What systems operate at a higher pressure than CCW?

Answer 1

• *RHR HX**
• *RCP Thermal Barrier**
• *Letdown HX**
• *Excess Letdown HX**
• *RCDT HX**
• *Primary Sample Coolers**
• *SFP HX**

Question 2

• LOT 201.12 CCW*
• • *

What is the temperature band CCW operates in during normal operations?

Answer 2

• *60 ˚F - 105 ˚F**
• MAX DBA: 122.3 ˚F*

60 ˚F Basis:

• Prevents condensate in Lube Oil Coolers
• Prevents thermal shock to RCP thermal barrier

• Note:*
• During C/D CCW Temp may reach 120 ˚F for 4 hrs (RHR cooling req.)*

Question 3

• LOT 201.12 CCW*
• • *

What CCW loads isolate when the CCW Surge tank reaches 64.6%? (1^st Low Level Isolation)

Answer 3

• HXs:*
• *Letdown HX**
• *Excess Letdown HX**
• *RCDT HX**
• Evaporators:*
• *Boron Recycle Evaporator**
• *LWPS Evaporator**
• Sample Coolers:*
• *Boric Acid Sample Cooler**
• *Primary Sample Coolers**
• Radiation Monitors:*
• *S/G Blowdown Rad Monitor**
• *BRS Rad Monitor**

Question 4

• LOT 201.12 CCW*
• • *

What are the important levels in the CCW Surge Tank?

Answer 4

• 83.3%:*
• *High Alarm**
• 74%:*
• *Makeup Valve Closes**
• 68.75%:*
• *Makeup Valve Opens**
• 66.7%:*
• *Low Alarm**
• 64.6%:*
• *1^st Low Level Isolation**
• 61.5%:*
• *2^nd Low Level Isolation**
• 56%:*
• *Baffles Begin**
• 49%:*
• *Compartment Level - Low Alarm**
• 8.3%:*
• *Compartment Level - Low 2 Alarm**

• Demin water normally fills CCW Surge Tank. (Auto)
• RMWST can fill the CCW Surge Tank. (Manual)

Question 5

• LOT 201.12 CCW*
• • *

What will happen in the CCW system during a SI?

Answer 5

• *All 3 CCW pumps start**
• 20 Sec on ESF DG Sequencer*
• Will start even if switches on CP001/CP002 are in off*
• *Opens CCW HX outlet and closes bypass valves**
• Full flow through HX*

Isolates non-ESF loads

• *Aligns CCW to RCFCs**
• Secures RCB Chill Water*
• *Opens RHR HX outlet valves**
• CCW Min Flow requirements*

• Note:*
• Must re-align cooling to SFP HXs in 2.5 hrs.*

Question 6

• LOT 201.12 CCW*
• • *

What will cause the thermal barrier isolation valve to shut?

Answer 6

CCW Flow - High (60 gpm)

CCW Temp - High (187 ˚F)

Protects CCW piping from thermal barrier HX leak.

Switches located on CP004.

Two in-line backpressure sensing valves provide backup

• Start to close at 120 psig
• Full close at 150 psig

• Note:*
• Backpressure sensing valves auto-reset when pressure drops below setpoint*

Question 7

• LOT 201.12 CCW*
• • *

What happens to the CCW system during a LOOP?

Answer 7

• *RHR HX Outlet Valve opens**
• *DWS Makeup to CCW Surge tank closes**
• *RCB Chilled Water Isolates to RCFCs**
• *RCDT HX Isolates**
• *Train “B” / Train “C” CCP X-Conn Closes**
• Supply and Return*
• *One CCW return header isolation closes**

Question 8

• LOT 201.12 CCW*
• • *

What will happen in the CCW system when the CCW Surge tank reaches 61.5%? (2^nd Low Level Isolation)

Answer 8

• *Isolates CCW Header**
• Isolates RCP Upper/Lower Bearing Coolers, Thermal Barrier, RCP Motor Air Coolers, SFP HX, PASS Coolers*

CCW Train “B” → CCP “B” and Seal Water HX

CCW Train “C” → CCP “A” and PDP

• *Opens RHR Outlet Valves for running CCW Pumps ONLY**
• Min flow requirements*

• Note:*
• As soon as CCW common header isolated, standby CCW pump will start on CCW Header Pressure - Low (76 psig)*

Question 9

• LOT 201.12 CCW*
• • *

Where are the CCW components physically located?

Answer 9

• 60’ MAB:*
• *Surge Tank**
• *Chemical Addition Tank**
• 29’ MAB:*
• *HXs**
• 10’ MAB:*
• *CCW Pumps**