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CCW Flashcards

1
Q

What are CCW design temperatures and pressures?

A
  • 140F - Max
  • 65F - Min
  • 150 psig
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2
Q

What is the functional requirement of CCW post-DBA?

A

Cooling to SDC system to have within 24 hours a containment pressure 50% or less of the design pressure.

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3
Q

What removes heat from the CCW Heat Exchangers?

A

‘A’ Critical Service Water Header

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4
Q

What are the CCW Temperature Control Valves?

A
  • CV-0821/CV-0822, E-54A and E-54B TCV
  • Maintains CCW 72ºF to 88ºF.
    • For PCP seal stability
  • Fail Closed on Loss of Air
  • Fail Closed on Loss of D-11-2
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5
Q

What is the purpose, design and capacity of T-3, CCW Surge Tank?

A
  • Surge volume based on CCW temperature rise from 60F to 140F
  • NPSH for CCW pumps.
  • Holds 1,230 gallons.
  • Design pressure 25 psig.
  • P-79A/B makeup capacity of 300 gpm.
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6
Q

What is normal operating level of T-3?

A

47% - 74%

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7
Q

Where is T-3, CCW Surge Tank vented?

A
  • To aux building via CV-0915.
  • Alarm on RE-0915, SV-0915 de-energizes and venting is to waste gas collection header.
  • Indicating lights only in CR. No controls.
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8
Q

At what pressure does T-3, CCW Surge Tank relieve?

A

20 psi lifts RV-0915 - goes to waste gas collection header.

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9
Q

What supplies T-3, CCW Surge Tank?

A

T-81, Primary System Makeup Storage Tank.

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10
Q

What are CCW Heat Exchanger DP limits?

A

Maximum allowable flow through the shell side of the CCWHX is 4700 gpm each.

This corresponds to a ΔP across the CCWHX of:

  • 24.1 psid for E-54A
  • 22.0 psid for E-54B
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11
Q

What are the CCW pump minimum discharge pressure limits with one pump operating and one heat exchanger?

A

115 psig

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12
Q

What are the CCW pump minimum discharge pressure limits with one pump operating and two heat exchangers?

A

102 psig

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13
Q

What are the CCW pump minimum discharge pressure limits with two pumps operating and two heat exchangers?

A

115 psig

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14
Q

What are the CCW pump minimum discharge pressure limits with three pumps operating and two heat exchangers?

A

129 psig

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15
Q

What happens to CCW on SIAS?

A
  • All three pumps start.
  • CV-0944, 0944A and 0977B close.
  • SD Cooling Inlet CV-0937/0938 open
  • CV-0913 and CV-0950 ESS Pump Seal & Bearing Cooling inlet/outlet get open signals.
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16
Q

What happens to CCW pumps on SIAS with loss of offsite power?

A
  • P-52A and P-52B start within 23 seconds of EDG start
  • P-52C gets standby signal at 40 seconds and will start if low pressure signal is present from 40 to 42 seconds after EDG start.
  • Same as Loss of Offsite Power without SIAS.
17
Q

What happens to CCW on CHP?

A

CV-0910 CCW to Containment and CV-0911/CV-0940 CCW from Containment get a close signal.

Will Close if in AUTO

Will remain open if in OPEN

Will open if in AUTO and CHP reset

18
Q

What happens to CCW on RAS?

A
  • CV-0945/0946 CCW inlets get open signal
  • CV-0823/0826 SW High Caps go full open
  • SW TCV valves CV-0821/0822 go closed.
19
Q

On loss of DC to SV-0945/0946 what happens?

A

CV-0945/0946 CCW inlets fail open on loss of air.

20
Q

What controls CV-0821/0822?

A
  • TIC-0821 normally operated with output air at 5-13 psig.
  • 3 psig is full closed. 15 psig is full open.
  • Fails Closed on loss of Air
  • Fails Closed on Loss of D-11-2
21
Q

What are CV-0937 & CV-0938?

A

CV-0937 & CV-0938

  • SDC HT Exchanger Inlets.
    • Right Channel SIAS opens CV-0937
    • Left Channel SIAS opens CV-0938
    • Situated in parallel.
    • Open on loss of air.
22
Q

What is CV-0944A?

A

CV-0944A

  • CCW to SFP and RW Evaps.
  • Fails closed on loss of air.
23
Q

What is CV-0944?

A

CV-0944

  • CCW to Radwaste Evaps.
  • Fails closed on loss of air.
  • Cannot be reopened until SIAS reset.
24
Q

What is CV-0977B

A

CV-0977B

  • CCW return from Radwaste Evaps.
  • Fail closed on loss of air.
25
Q

What are CV-0913 and CV-0950?

A

CV-0913 and CV-0950

  • CCW supply & return from ESS pump coolers.
  • Fail open on loss of air.
  • Get open signal on SIAS
26
Q

What are CV-0947, CV-0948 and CV-0949?

A

CCW supply to B ESS pumps (0947)

CCW supply to A ESS pumps (0948)

CCW supply to ESS pumps (0949)

Fail open on loss of air.

27
Q

What are CV-0910 and CC-0910?

A

CV-0910 and CC-0910

CCW supply to containment and its check valve.

  • Fail open on loss of air.
  • Closed on CHP.

Handswitch

  • Close - remains closed as long as power and air.
  • Open - valve will remain open under all circumstances (including CHP)
  • Auto - valve will open and remain open unless a CHP signal is received by the valve to go closed. (If valves are in AUTO and a CHP signal is present) (then if the CHP is RESET, the valves will OPEN)
28
Q

What are CV-0911 and CV-0940.

A

CV-0911 and CV-0940

CCW from containment.

  • Fail open on loss of air.
  • Closed on CHP.
  • Accumulators present to maintain closed in event of CHP with loss of air.
29
Q

What is CV-0918?

A

CV-0918

T-3, CCW Surge Tank Fill.

  • Opens at 47% and closes at 74%.
  • Indication only in CR. No switches.
30
Q

What is CV-0915?

A

CV-0915

  • T-3, CCW Surge Tank Vent.
  • Indication only in CR.
31
Q

What are the optimum CCW HX dp readings for 1 and 2 pumps operating?

A

1 pump - 6-8 psid

2 pumps - 12-16 psid

32
Q

What CCW controls are on C-33?

A

CV-0946/0945 – CCW HX inlets

CV-0937/0938 – SDC HX Cooling inlets

CV-0913/0950 – ESS Pumps CCW supply/Return

CV-0947/0948/0949 – ESS A/B train Pumps supplies and ESS Pumps supplies

33
Q

What is Left Train CCW?

A
  • P-54A
  • E-54B
  • T-3
  • CV-0911
  • CV-0938
  • CV-0946
34
Q

What is Right Train CCW?

A
  • P-52B
  • E-54A
  • T-3
  • CV-0937
  • CV-0940
  • CV-0945
35
Q

When is CCW required to be operable?

A

Modes 1-4

Others per equipment needs.

36
Q

What is the operability status if CCW is isolated to one CCW heat exchanger?

A

If the CCW side (shell side) of either CCW heat exchanger is out of service,
100% of the required CCW post accident cooling capability cannot be
assured.

37
Q

What is required to provide 100% Cooling if one CCW Heat Exchanger has service water isolated?

A

100% Cooling - SWS side to one CCW Heat Exchanger Isolated

  • 3 safety related Containment Air Coolers
  • 2 Containment Spray Pumps
  • 2 CCW pumps P-52A and P-52B
  • 2 SWS pumps
  • Both Shutdown Cooling Heat Exchangers

PLUS

One CCW Containment header valve, CV-0910, CV-0911, or CV-0940, is OPERABLE

AND

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

38
Q

When can 100% cooling be met with one CCW pump?

A

One Pump Cooling

Both CCW heat exchangers are available

One CCW Containment header valve, CV-0910, CV-0911, or CV-0940, is OPERABLE,

AND

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

39
Q

When can two CCW pumps meet 100% cooling requirements?

A

Two pump cooling

Both CCW heat exchangers are available

One CCW Containment header valve, CV-0910, CV-0911, or CV-0940, is OPERABLE

OR

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

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