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Pirtle NRC PREP Group Study > AOP > Flashcards

AOP Flashcards

1
Q

What are the immediate actions for LD Temp / Pressure Failure?

A

Take controller to manual

If doesn’t work, Isolate Letdown and Minimize Charging

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2
Q

What are the immediate actions for unexpected operation of steam dumps?

A

Take controller to manual and close

If open due to control failure, place selector switch in OFF

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3
Q

What are the immediate actions for FW Htr Level Control?

A

Place control in manual

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4
Q

What are the immediate actions for a LO Temperature controller failure?

A

Place affected controller in hand and stabilize

If AOV doesn’t maintain, use MOV

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5
Q

What happens if the PRZ reference leg develops a leak on the controlling channel?

A

That channels level will rise, causing actual level to go down due to QRV-251 closing

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6
Q

When temperature drops rapidly during a secondary transient, what don’t you do?

A

Use rods to restore. The lowering temp and the rod withdrawal both add positive reactivity.

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7
Q

Does MPC-254 affect rod control?

A

NO

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8
Q

What are the effects if a Tcold instrument fails high?

A

OPDT and OTDT lower

DT is smaller

Tavg is larger

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9
Q

What will happen if a controlling FF instrument fails low til no operator action?

A

Turbine / Rx trip on High High SG Level and FWI

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10
Q

For a load rejection, are LONG TERM effects worse at BOL or EO? And Why?

A

EOL bc of Xenon Oscillations

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11
Q

For a load rejection, are SHORT TERM effects worse at BOL or EO? And Why?

A

BOL bc not as much temperature feedback.

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12
Q

What are the immediate actions for loss of CCW?

A
  1. Check Unit Status - M1 or M2
  2. Trip Rx and verify tripped
  3. Trip RCPs
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13
Q

What do you do on a loss of CCW with both charging pumps running?

A

Run 1 to failures, place the other in PTL

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14
Q

What do you do on a loss of CCW with only 1 CCP available?

A

Place C/S in PTL. SAVE THE PUMP!

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15
Q

What do you do with the CCPs in Modes 5 or 6 if CCW is lost?

A

Stop both CCPs and place PTL

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16
Q

Why would you not cross-tie CCW if the failure is due to a hydraulic condition?

A

Could cause air binding in the pump

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17
Q

What is the most probably source of CCW out leakage?

A

RCP Seal Return Hx

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18
Q

What is the assumed LD flow for the XS Letdown Hx?

A

20 gpm

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19
Q

What is the first thing you do if you have a suspected RCS Leak?

A

Place XS LD I/S and isolate normal letdown

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20
Q

When do you trip the reactor and enter E-0 during an RCS Leak?

A

When the leak exceeds the capacity of 2 CCPs

If containment pressure approaches 1 psig

VCT Level cannot be maintained

21
Q

What is the E-Plan limit for RCS Leakage?

A

10 gpm

22
Q

How do you identify a leaking in core detector thimble tube?

A

Measure thimble tube temps 6” above tube Isolation valves

23
Q

For a SG Tube leak, what is the leakage for a Rx Trip?

A

> 50 gpm

24
Q

For a SG Tube lark, what is the leakage for a Rx Trip and SI?

A

> 100 gpm

25
Q

In the Control Air Malfunction AOP, there is a caution about an inadvertent SI. What could this be caused by?

A

Uneven cooling of the SGs causing steamline dP SI

26
Q

During a spurious phase A, why would the PRT parameters change?

A

Seal return isolates

27
Q

What is expected to happen when you reset phase A?

A

CUVs start

28
Q

What happens to rods if MPC-253 fails height?

A

Rods step out

29
Q

What happens if MPC-253 fails low?

A

Rods step in

30
Q

What happens if Tave Fails high?

A

Rods step in

31
Q

What happens if PR Fails High?

A

Rods step in , but C2 prevents rods from stepping back out due to temp error

32
Q

What happens if PR fails low or Tave fails low?

A

NO Rod motion

33
Q

If 1 control rod falls into the core, what is affected?

A

Radial Power distribution.

NOT SDM

34
Q

If there is a dropped rod indicated, how should power reduction be made? And why?

A

Boration only to prevent exaggerating any existing flux tilts

35
Q

What must you do if you have a dropped or misaligned rod?

A

SDM within 1 hour

36
Q

While in Malfunction of a RCP, what is total # 1 seal flow?

A

Sum of #1 and #2 (RCDT In-Leakage)

37
Q

Which CRID loss is the most survivable?

A

CRID 3

38
Q

If Train A 250 VD is loss, does the Generator Trip in U1?

A

NO! Train A supplies 33 VED, so it doesn’t energize

39
Q

Will a single ground on the generator field cause any harm?

A

No. However, a second groups could cause excessive field current and cause extensive damage

40
Q

Why do we want to keep the generator connected to the grid until the turbine stop valves are closed?

A

So we don’t Overspeed the turbine

41
Q

With a loss of CCW, the unaffected Unit will be needed to cross tie a system. Which system and why?

A

CVCS to maintain seal injection flow to the RCPs

42
Q

If a PRZ Level channel fails high, what does QRV-251 do assuming no operator action?

A

Throttles to LESS than minimum charging, supply approximately 19 gpm seal injection flow

43
Q

The Reactor should be trippped immediately if frequency falls belo:

A

58.2 Hz

44
Q

If in M3 and there is a Loss of NESW, what is the required action and impact?

A

Stop ALL but 1 RCP and perform a pressure relief, containment chillers have lost cooling water

45
Q

What is the RCP Trip Criteria per the RCP Malfunction FOP?

A
  1. Complete Loss of RCP Seal Cooling
  2. # 1 Seal Leakoff Temp > 200*F
  3. # 1 Seal Leakoff Temp > 185*F AND Loss of Seal Injection
  4. RCP Lower Bearing Water Temp > 225*F
  5. RCP Upper Motor Bearing Temp > 200*F
  6. RCP Vibes > 20 mils
  7. # 1 Seal Leakoff > 6 gpm
  8. # 1 Seal Leakoff < 1 gpm AND Temp rising on lower bearing water OR #1 Seal Leak Off
46
Q

What is the RCP Malfunction criteria requiring a plant shutdown and stopping RCPs in < 8 hrs

A

1 Seal Leakoff > 5.4 gpm

RCP Motor temp > 145*F

Seal Leakoff flow different than expected range and can’t be restored or # 2 seal high standpipe level

47
Q

While at midloop, what must be done if RHR pump shows fluctuating amps and flow?

A

Boh RHR pumps are placed in PTL if indications of cavitation are experienced. Starting the other RHR pump could cause air entrainment in the other pump and a complete loss of RHR could occur

48
Q

For a leaky PORV, what are the big pic procedure steps to identify which one?

A

Close ALL PORV block valves to lower tailpipe temp

Open 1 PORV block valve at a time

Leakage is determined by a rise in tailpipe temp as each is opened

Pirtle NRC PREP Group Study (10 decks)

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