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Advanced Systems > Service Water > Flashcards

Service Water Flashcards

1
Q

LCO 3.7.8 “Service Water System” requirements

A

2 SWS trains shall be operable

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2
Q

LCO 3.7.9 “Ultimate Heat Sink” requirements

A

The Ultimate Heat Sink shall be operable

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3
Q

“A” critical service water header loads

A 
CCW
EESG cooler
EDG 1-2
VC-10
ESS seals cooling backup
AFW P-8C suction backup
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4
Q

“B” critical service water header loads

A 
CAC
Containment fire water
WESG cooler
EDG 1-1
VC-11
ESS seals cooling backup
AFW P-8C suction backup
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5
Q

Ultimate heat sink operability

A

<=85 F

>=568.25 ft

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6
Q

Traveling screens power supplies

A

F-4B - MCC 6

F-4C - MCC 5

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7
Q

Traveling screens auto backwash setpoint

A

Every 8 hours

Differential level of 6” (alarms at 9”)

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8
Q

Service water pumps power supplies

A

P-7A/C - D bus

P-7B - C bus

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9
Q

Service water pumps capacities

A

8000 gpm @ 70-80 psi

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10
Q

Service water pump auto start

A

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

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11
Q

Basket strainer DP setpoints

A

Alarms at 7 psid

Inoperable at 12 psid

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12
Q

Filtered service water loads

A

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

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13
Q

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

A

Timer - 4x/day

High DP - 1.5 psid, alarms locally @ 3.5 psid

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14
Q

P-5 Warm Water Recirc Pump suction and discharge

A

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

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15
Q

P-5 power supply

A

LCC-13

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16
Q

P-5 use

A

De-icing traveling screens

17
Q

Service water response on SIS

A

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

18
Q

Service water response on RAS

A

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

19
Q

Service water response to loss of offsite power

A

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

20
Q

Service water response to loss of offsite power with SIS

A

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

21
Q

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

A

Could exceed NPDES limits

22
Q

Precaution while CCW valves to ESS coolers are open

A

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

23
Q

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

A

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

24
Q

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

A

Will take the pump out of standby

25
Q

LCO 3.7.8 “Service Water System” applicability

A

Modes 1-4

26
Q

LCO 3.7.9 “Ultimate Heat Sink” applicability

A

Modes 1-4

27
Q

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

A

Enter LCO 3.0.3 IMMEDIATELY

28
Q

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

A

CV-1359, non-critical sw header isolation, operable

                                AND

Either CV-0824, SW return from containment, or CV-0847, SW supply to containment, operable

29
Q

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

A

CV-1359, non-critical sw header isolation, operable

                                OR

Either CV-0824, SW return from containment, or CV-0847, SW supply to containment, operable

30
Q

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

A

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

31
Q

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

A

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.

32
Q

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

A

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

33
Q

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?

A

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.

Advanced Systems (36 decks)

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