Essential Cooling Water (EW)

Question 1

What are the loads EW can carry on a loss of NC?

Answer 1

Priority Heat loads:
-RCP coolers (seal cooler, HP cooler, thrust bearing cooler, motor coolers, motor lube oil coolers)
-CEDM coolers
-Norm Chiller
-Nuclear Sample coolers

Non-Priority Heat loads:
-SFP HXs

Question 2

What is the design basis maximum temperature that EW will maintain ESF system water to during a LOCA?

Answer 2

135*F

Question 3

What will autostart EW pumps?

Answer 3

SLAC-CC

SIAS
LOP
AFAS
CSAS

CREFAS
CRVIAS

Question 4

If EW is isolated from the EC system, which of the two systems is inoperable?

Answer 4

EC only

Question 5

If EW is isolated from the SDC, which of the two systems is inoperable?

Answer 5

Both

EW can’t maintain its acceptable limits

Question 6

Between what levels does the auto makeup maintain EW Surge Tank level?

Answer 6

22” and 26”

Question 7

What are the makeup supply options for EW surge Tank?

Answer 7

Norm - DW
Class ALT - CT
ALT (never use) - Cooling water holdup tank (CM)
Emergency - Fire Protection

Question 8

What level in the EW Surge Tank will auto close the ‘A’ EW to NC cross-tie valves (EWA-UV-65 and EWA-UV-145)?

Answer 8

Lo-Level 17”

Question 9

What is the low-level in the EW Surge Tank will isolate makeup? Why?

Answer 9

14”

prevent feeding a leak

Question 10

What is the purpose of the RHPCV?

Answer 10

prevent stacking

installed at the EW outlet of EC condenser section

closes on low pressure, opens for high pressure

Question 11

What auto closes the ‘A’ MOV, EW -> NC cross-tie valves?

What can be overridden?

Answer 11

SIAS, Lo Tank level (14”)

SIAS ONLY

Question 12

What is required to make EW operable again after EW is cross-tied to the SFP-HX?

Answer 12

flow balance on EW