Service Water

Question 1

LCO 3.7.8 “Service Water System” requirements

Answer 1

2 SWS trains shall be operable

Question 2

LCO 3.7.9 “Ultimate Heat Sink” requirements

Answer 2

The Ultimate Heat Sink shall be operable

Question 3

“A” critical service water header loads

Answer 3

CCW
EESG cooler
EDG 1-2
VC-10
ESS seals cooling backup
AFW P-8C suction backup

Question 4

“B” critical service water header loads

Answer 4

CAC
Containment fire water
WESG cooler
EDG 1-1
VC-11
ESS seals cooling backup
AFW P-8C suction backup

Question 5

Ultimate heat sink operability

Answer 5

<=85 F

>=568.25 ft

Question 6

Traveling screens power supplies

Answer 6

F-4B - MCC 6

F-4C - MCC 5

Question 7

Traveling screens auto backwash setpoint

Answer 7

Every 8 hours

Differential level of 6” (alarms at 9”)

Question 8

Service water pumps power supplies

Answer 8

P-7A/C - D bus

P-7B - C bus

Question 9

Service water pumps capacities

Answer 9

8000 gpm @ 70-80 psi

Question 10

Service water pump auto start

Answer 10

40 psi low discharge pressure of either operating pump
If only 1 pump operating, placing one of the other 2 in standby will cause it to start because it sees discharge pressure @ 0 psi on the other “operating” pump

Question 11

Basket strainer DP setpoints

Answer 11

Alarms at 7 psid

Inoperable at 12 psid

Question 12

Filtered service water loads

Answer 12

Cooling Tower Pumps
P-910 Vacuum Pump
P-25A/B/C SW Booster Pumps
C-16A/B Vacuum Priming Pumps

Question 13

F-13A/B, Seal Water Supply Strainers, auto backwash

Answer 13

Timer - 4x/day

High DP - 1.5 psid, alarms locally @ 3.5 psid

Question 14

P-5 Warm Water Recirc Pump suction and discharge

Answer 14

Suction from cooling tower makeup basin, discharges to service water bays

Question 15

P-5 power supply

Answer 15

LCC-13

Question 16

P-5 use

Answer 16

De-icing traveling screens

Question 17

Service water response on SIS

Answer 17

All 3 pumps start
Non-Crit header isolates (CV-1359)
CAC outlets open
VHX-4 inlet closes

Question 18

Service water response on RAS

Answer 18

CCW service water inlets fail open
CCW high capacity outlets fail open to hard stops
CCW TCV’s close

Question 19

Service water response to loss of offsite power

Answer 19

NSD sequencer starts all 3 pumps:
P-7A/B start 7 seconds after EDG breaker closes
P-7C starts 26 seconds after EDG breaker closes

Question 20

Service water response to loss of offsite power with SIS

Answer 20

DBA sequencer starts all 3 pumps:
P-7A/B start 7 seconds after EDG breaker closes
P-7C starts 26 seconds after EDG breaker closes

Question 21

Precaution for operating all 3 service water pumps and both dilution water pumps with plant offline

Answer 21

Could exceed NPDES limits

Question 22

Precaution while CCW valves to ESS coolers are open

Answer 22

Service water CV’s to ESS coolers and their air supplies shall remain closed to prevent draining CCW to the lake

Question 23

Precaution for operating all 3 service water pumps with high header pressure

Answer 23

> 90 psi, will cause indicated low flow through the system, and could cause damage to piping or pumps

Question 24

Precaution for taking service water pump control switch to either close or trip

Answer 24

Will take the pump out of standby

Question 25

LCO 3.7.8 "Service Water System" applicability

Answer 25

Modes 1-4

Question 26

LCO 3.7.9 "Ultimate Heat Sink" applicability

Answer 26

Modes 1-4

Question 27

LCO 3.7.8 "Service Water System" required actions if less than 100% of the required post accident SW cooling capability available.

Answer 27

Enter LCO 3.0.3 IMMEDIATELY

Question 28

What are the requirements for 100% SWS post accident cooling capability with only 1 service water pump?

Answer 28

CV-1359, non-critical sw header isolation, operable AND Either CV-0824, SW return from containment, or CV-0847, SW supply to containment, operable

Question 29

What are the requirements for 100% SWS post accident cooling capability with only 2 service water pumps?

Answer 29

CV-1359, non-critical sw header isolation, operable OR Either CV-0824, SW return from containment, or CV-0847, SW supply to containment, operable

Question 30

What are the requirements for 100% SWS post accident cooling capability with 3 service water pumps?

Answer 30

No special requirements. With all 3 pumps available, 100% required cooling capability can be provided, even with flow to non-critical header and to containment

Question 31

What is a concern with breaching CV-0824, SW Return From Containment?

Answer 31

Valve is in West Safeguards, so it is at a lower elevation than the SW discharge into the Makeup Basin. Has the potential to drain the Makeup Basin into West Safeguards.

Question 32

What is the Service Water availability in the event of an electrical fire which can start and stop equipment (Appendix R)?

Answer 32

Only P-7B, due to a remote-local transfer switch on its breaker on "C" Bus

Question 33

What are the consequences of engaging the manual operators on CV-0823, CCW Heat Exchanger (E-54A) Outlet, and CV-0826, CCW Hx (E-54B) Outlet?

Answer 33

This defeats the RAS signal feature of opening these valves to their hard stops. Could also open valves past their hard stops when operating manually.