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4. EOPs > E-1 Daily Quiz > Flashcards

E-1 Daily Quiz Flashcards

1
Q

List the four phases of a LBLOCA?

A

Blowdown
Refill
Reflood
Long Term Recirc

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2
Q

When does ECCS injection reach the intact loops?

A

Reflood Phase

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3
Q

What does the accident analysis 10.CFR.50.59 state?

A

Some fuel damage may occur

None of the ECCS acceptance criteria will be exceeded

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4
Q

Why is the TCA for transfer to cold leg recirc 5 min?

A

Ensure Peak Clad Temp not exceeded

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5
Q

How much time must pass prior to placing RHR Spray in service?

A

50 Min to ensure decay heat can be removed from CCPs and SI pps

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6
Q

What is the threshold for a SBLOCA?

A

Greater than the capacity of the charging system

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7
Q

What is the threshold for a LBLOCA?

A

Below shutoff head of RHR pumps (>400gpm)

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8
Q

Why are RCps tripped during a LBLOCA?

A

Loss of CCW on Phase B

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9
Q

Three phases of SBLOCA?

A

blowdown
reflood
long term recirc

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10
Q

What must be done if a SG is found to be depressurizing during E-1 step 2 and cannot be isolated due to equipment failures?

A

Consider it isolated and move on in E-1

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11
Q

What is the purpose of checking any SG pressure lowering or RCS pressure rising in E-1 Step 9?

A

To determine if faulted SG is still blowing down and loop through procedure again to determine if SI can be terminated

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12
Q

What is the basis for accumulator isolation with RCS pressure <150psig?

A

Accumulator water has already injected and all that remains is N2

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13
Q

What must the crew do if a Red path is identified while transferring to ES-1.3?

A

Complete portions of ES-1.3 until it tells you to begin monitoring status trees again

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14
Q

While responding to a LOCA RCS pressure is above RHR pump head but lowering. Should the RHR pups be stopped?

A

No, pressure may lower below their shutoff head at some point

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15
Q

While performing E-1 what conditions must be satisfied to allow CTS pumps to be stopped?

A

Ctmnt pressure <2psig

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16
Q

When would hot leg recirc be utilized following a SBLOCA and why would it not normally be used?

A

If sub cooling was not restored use it

If sub cooling is restored concentrated boric acid in the core would not occur

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17
Q

Why must SI pumps be stopped during alignment to hot leg recirc?

A

Dead head the pump, mini flows closed during cold leg recirc alignment

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18
Q

Where do the ECCS pumps discharge during hot let recirc?

A

RHR and SI to hot legs

CCP to cold legs

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19
Q

What must be done if only one SI pump recirc valve will close while swapping to cold leg recirc?

A

Only one required they are in series

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20
Q

What is the basis for splitting CCW trains in ES-1.3?

A

Prevent pump runout if one were to trip

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21
Q

Under what conditions would the SI pumps not be aligned for cold leg recirc?

A

If RCS pressure is above their shutoff head

22
Q

What are the restrictions for placing hydrogen recombiners in service?

A

6 hours after event with hydrogen concentration between 0.5 and 4%

23
Q

Requirements for SI termination

A

Subcooling >40
Heat Sink
RCS Pressure stable or rising
PRZ level

24
Q

Why is RCS pressure checked after stopping a CCP during SI termination?

A

To detect a SBLOCA

25
Q

What must you do if PRZ level cannot me maintained after establishing normal Charging in SI termination?

A

Realign the BIT and go to ES-1.2 Post LOCA cooldown

26
Q

What happens during a SBLOCA that causes the core to recover after being uncovered for a period of time?

A

Loop seal clears

27
Q

What are the two heat removal methods during a SBLOCA? Which one is also effective during a LBLOCA?

A

ECCS/Break flow and SGs

ECCS flow, SG are a heat source

28
Q

When does natural circ stop and reflux cooling begin?

A

When the steam generation rate in the core exceeds the condensing capacity of the SGs

29
Q

What is reflux cooling?

A

Condensed steam flows back the hot legs to the core

30
Q

Affects of leaving the RCPs running during a SBLOCA

A

Increased mass loss keeping two phase mixture at the break.

Increased heat transfer until shutdown

31
Q

Why do we trip RCPs at 1300psig?

A

Prior to break uncovery if done afterwards would not prevent the increased mass loss

32
Q

What makes a SBLOCA in the cold leg worse?

A

Loop seal must clear before steam can be vented from the break

33
Q

What indication is unique to a PRZ steam space break

A

PRZ level rising

34
Q

When does the 1300psig RCP trip not apply?

A

Operator induced cooldown
Following direction to start RCP
SI from non power condition

35
Q

When is PRZ level not a valid indication of RCS inventory?

A

When subcooling doesn’t exist because of head voiding

36
Q

Conditions that would force you to ES-1.2 from E-1 and ES-1.1?

A

No RHR injection
Pressure lowering following stop of first CCP
PRZ level cannot be maintained with normal charging
RCS Pressure less than SI Pump shutoff head

37
Q

What conditions will allow stopping an ECCS Pump during flow reduction of ES-1.2 when only PRZ level requirements are met?

A

Hot leg temps less than 340 F and RHR in service

38
Q

If RCS pressure drops to just above RHR head following a LOCA can the cooldown be initiated in ES-1.2 at the first encounter?

A

No, cool down must remain less than 100 degrees in any 60 min period

39
Q

In ES-1.2 why do we continue to monitor subcooling greater than 40 degrees?

A

To determine if ECCS flow reductions can be performed

40
Q

What is the subcooling trend following stopping of one ECCS pump during flow reduction?

A

Sub cooling will lower but should remain above minimum. It will then increase due to the cooldown.

41
Q

Preferred RCP to restart during ES-1.2? What effects spray flow?

A

3

Highest DP
PRZ level
Coolant velocity

42
Q

Adverse conditions from depressurizing RCS to refill the PRZ with no RCPs running?

A

Voiding in the head

43
Q

Major action categories of ECA-1.1?

A

Attempt to restore equipment
Conserve RWST
Cooldown
Minimum Subcooling

44
Q

What actions are performed to minimize break flow?

A

Depressurize to minimum subcooling

45
Q

What is the basis for depressurizing the SGs to 670psig in ECA-1.1?

A

Perform a controlled injection of accumulators to keep the core covered

46
Q

What conditions must exists for operators to leave the loop of the first 25 steps of ECA-1.1?

A

RWST <11% stop and lockout RHR/CTS pumps

47
Q

What must be performed if recirc equipment is restored in ECA-1.1?

A

Return to procedure step in affect

48
Q

E-Plan classification for ECA-1.2 Loca Outside Containment?

A

SAE

49
Q

How do we determine if ECA-1.2 LOCA Outside containment efforts were successful?

A

RCS Pressure Rising

50
Q

How many CTS pumps are required in ECA-1.1 based on containment pressures?

A

<8 psig none
>8 psig one
>12 psig two

4. EOPs (10 decks)

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