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Advanced Systems > CCW > Flashcards

CCW Flashcards

1
Q

LCO 3.7.7 “CCW System” requirements

A

2 CCW trains shall be operable

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2
Q

CCW safety related loads

A

SDC HX

ESS seal cooling

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3
Q

CCW non-safety related loads

A 
PCP leak off and oil coolers
Letdown HX
SFP HX
Evaps
Waste gas compressors
CRDM seals
Charging pump oil coolers
P-55A fluid drive
Vac degas pumps seal cooling
Shield cooling HX
PCS sample coolers
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4
Q

General CCW temp/press ratings

A

65-140 F

150 psi

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5
Q

CCW flow requirements

A

Normal - 4367 gpm
SDC - 7179 gpm
SIS - 1697 gpm
CHP/RAS - 4573 gpm

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6
Q

Normal CCW operation

A

1 pump running, 2 in standby
2 HX’s in service
Normal TCV’s throttle service water flow to control CCW temp 72-88 F

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7
Q

SDC CCW operation

A

2 pumps running, 1 in standby
2 HX’s in service
Placed in service when PCS <265 psi and 300 F

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8
Q

CCW pump power supplies

A

P-52A/C - C bus

P-52B - D bus

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9
Q

CCW pump flow capacity

A

6000 gpm

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10
Q

CCW pump auto starts

A

Low header pressure - 80 psi with pump in standby
SIS
NSD sequencer
DBA sequencer

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11
Q

CCW pump auto stops

A

Load shed

Overcurrent

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12
Q

CCW pump CR controls

A

Close - starts pump, takes it out of standby

Trip - stops pump, takes it out of standby

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13
Q

CCW pump standby feature

A

Push button

Allows auto start at 80 psi header pressure

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14
Q

How can CCW pump standby be disabled

A

Take pump hand switch to trip
Pump start
Undervoltage on pump’s respective bus

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15
Q

CCW HX max flow

A

4700 gpm corresponds to DP of:
E-54A - 24.1 psid
E-54B - 22.0 psid

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16
Q

CCW HX preferred DP

A

1 pump - 6-8 psid

2 pumps - 12-16 psid

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17
Q

RIA-0915 CCW rad monitor function

A

Monitors CCW pump discharge

Swaps CCW surge tank vent from atmosphere to VGCH when high rad is detected

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18
Q

Where can CCW HX inlet CV-0945/0946 be operated from and how do they fail

A

Fail open

Operated from CR or C-33

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19
Q

CCW HX TCV CV-0821/0822 function

A

Control SW flow through CCW HX to control CCW temp

Fail closed

20
Q

CCW HX temp alarm set points

21
Q

Where can SDC HX inlet CV-0937/0938 be operated from and how do they fail

A

Fail open
Operated from CR or C-33
Open on SIS, and can’t be closed until SIS is reset

22
Q

How does CCW to SFP and Evaps CV-0944A fail and how does it respond on SIS

A

Fails closed
Closes on SIS
Stays closed until SIS is reset, or handswitch is taken to bypass to allow cooling of SFP

23
Q

CV-0944A control switch positions

A

Open - opens valve unless SIS is present
Close - closes valve
Bypass - Opens valve if SIS is present, closes valve if SIS isn’t present

24
Q

CCW to Rad Waste Evaporators CV-0944/CV-0977B function

A

Fails closed
No indication of valve position in CR, only indication is on C-105
Closes on SIS to isolate CCW flow to non-essential loads

25
Q

ESS Pumps CCW Supply/Return CV-0913/CV-0950 function

A

Fails open
Operated from CR or C-33
Normally open, causing locked in alarm in the CR

26
Q

ESS Pumps CCW Supply CV-0949/CV-0948/CV-0947 function

A

Fails open
Operated from CR or C-33
Normally electrically locked open

27
Q

ESS pumps CCW low flow alarm setpoints

A

WESG - 9-11 gpm
EESG - 4-6 gpm
Indicates loss of cooling water flow from either CCW or SW depending on which one is aligned.
WESG is higher than EESG because there are more pumps in WESG

28
Q

CCW to and from Containment CV-0910/CV-0911/CV-0940 function

A 
Fails open to ensure loss of air/power won't isolate CCW to CTMT
Closes on CHP
Right channel - 0940
Left channel - 0911
Either channel - 0910
29
Q

Differences between CV-0910 CCW to CTMT and CV-0911/0940 CCW from CTMT

A

CCW to CTMT has a check valve, so no accumulator

CCW from CTMT valves have accumulators good to hold valve closed for 4 hours with a loss of air

30
Q

CCW to/from CTMT control switches

A

Close - Valve closes as long as no loss of air/power
Open - Valve opens regardless of CHP signal
Auto - Valve is open until CHP signal present, then valve will close until CHP signal is clear

31
Q

T-3, CCW Surge Tank, normal operating range

A

47-74%

Tank is big enough so a CCW temp increase from 60 F to 140 F won’t cause a high level alarm

32
Q

T-3, CCW Surge Tank, alarm setpoints

33
Q

T-3, CCW Surge Tank, sources of inleakage

A 
SDC HX
SFP HX
Letdown HX
PCP seals
CRD seals
34
Q

T-3, CCW Surge Tank, sources of out leakage

A 
Evaps
Charging pumps lube oil coolers
P-55A fluid drive
Vac Degas Pumps
Shield cooling HX
PCP lube oil coolers
Waste gas compressors
PCS sample cooler
ESS pump seals
35
Q

CCW surge tank fill CV-0918 function

A

No Handswitch, only indication
Opens at 47% to fill tank from T-81
Closes at 74%
Fails closed

36
Q

CCW surge tank vent CV-0915 function

A

No Handswitch, only indication
Fails to VGCH
Normally aligned to atmosphere, re-aligns to VGCH on high rad signal

37
Q

CCW response to SIS with offsite power

A

All 3 pumps start
OPEN:
• CV-0937/CV-0938, SDC HX Cooling Inlets
• CV-0913, ESS Pumps CCW Supply (normally open)
• CV-0950, ESS Pumps CCW Return (normally open)
Close:
• CV-0944A, CCW to SFP & RW Evaporators
• CV-0944, CCW to Rad Waste Evaporators
• CV-0977B, CCW Return From Rad Waste Evaporators

38
Q

CCW response to SIS with loss of offsite power

A

P-52A & B start after 23 seconds
P-52C starts after 40 seconds if low pressure condition
OPEN:
• CV-0937/CV-0938, SDC HX Cooling Inlets
• CV-0913, ESS Pumps CCW Supply (normally open)
• CV-0950, ESS Pumps CCW Return (normally open)
Close:
• CV-0944A, CCW to SFP & RW Evaporators
• CV-0944, CCW to Rad Waste Evaporators
• CV-0977B, CCW Return From Rad Waste Evaporators

39
Q

CCW response to a loss of offsite power

A

P-52A & B start after 23 seconds

P-52C starts after 40 seconds if low pressure condition

40
Q

CCW response to CHP

A

All 3 pumps start
OPEN:
• CV-0937/CV-0938, SDC HX Cooling Inlets
• CV-0913, ESS Pumps CCW Supply (normally open)
• CV-0950, ESS Pumps CCW Return (normally open)
Close:
• CV-0944A, CCW to SFP & RW Evaporators
• CV-0944, CCW to Rad Waste Evaporators
• CV-0977B, CCW Return From Rad Waste Evaporators
• CV-0910, CCW to CTMT
• CV-0911, CCW from CTMT
• CV-0940, CCW from CTMT

41
Q

LCO 3.7.7 “CCW System” applicability

42
Q

LCO 3.7.7 “CCW System” required actions if less than 100% of the required post accident CCW cooling capability available

A

Enter LCO 3.0.3 IMMEDIATELY

43
Q

What are the requirements for 100% required CCW post accident cooling with only 1 CCW pump?

A

1 CCW containment header valve, CV-0910, CV-0911, or CV-0940, operable

                                AND

2 CCW isolation valves for non-safety related loads outside containment, CV-0944A and CV-0944 or (CV-0977B)

44
Q

What are the requirements for 100% required CCW post accident cooling with only 2 CCW pumps?

A

1 CCW containment header valve, CV-0910, CV-0911, or CV-0940, operable

                                OR

2 CCW isolation valves for non-safety related loads outside containment, CV-0944A and CV-0944 or (CV-0977B)

45
Q

What are the consequences of having CCW to/from containment isolation valves (CV-0910, CV-0911, and CV-0940) in open position instead of auto?

A

Valves will not close on CHP

46
Q

What are the consequences of not having 2 CCW pumps in service when stroking open SDC heat exchanger inlet valves?

A

Standby CCW pump could start

47
Q

What are the consequences if CCW heat exchanger outlet temperatures get too high?

A

PCP seal temperatures will elevate

Advanced Systems (36 decks)

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