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CCW Flashcards

(39 cards)

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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?

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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?

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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?

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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?

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A

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

20
Q

What controls CV-0821/0822?

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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?

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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?

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A

CV-0944A

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

What is CV-0944?

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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

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A

CV-0977B

  • CCW return from Radwaste Evaps.
  • Fail closed on loss of air.
25
What are CV-0913 and CV-0950?
CV-0913 and CV-0950 * CCW supply & return from ESS pump coolers. * Fail open on loss of air. * Get open signal on SIAS
26
What are CV-0947, CV-0948 and CV-0949?
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
What are CV-0910 and CC-0910?
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
What are CV-0911 and CV-0940.
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
What is CV-0918?
CV-0918 T-3, CCW Surge Tank Fill. * Opens at 47% and closes at 74%. * Indication only in CR. No switches.
30
What is CV-0915?
CV-0915 * T-3, CCW Surge Tank Vent. * Indication only in CR.
31
What are the optimum CCW HX dp readings for 1 and 2 pumps operating?
1 pump - 6-8 psid 2 pumps - 12-16 psid
32
What CCW controls are on C-33?
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
What is Left Train CCW?
* P-54A * E-54B * T-3 * CV-0911 * CV-0938 * CV-0946
34
What is Right Train CCW?
* P-52B * E-54A * T-3 * CV-0937 * CV-0940 * CV-0945
35
When is CCW required to be operable?
Modes 1-4 Others per equipment needs.
36
What is the operability status if CCW is isolated to one CCW heat exchanger?
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
What is required to provide 100% Cooling if one CCW Heat Exchanger has service water isolated?
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
When can 100% cooling be met with one CCW pump?
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
When can two CCW pumps meet 100% cooling requirements?
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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