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5. NRC Prep > 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?

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?

24
Q

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

25
In the Control Air Malfunction AOP, there is a caution about an inadvertent SI. What could this be caused by?
Uneven cooling of the SGs causing steamline dP SI
26
During a spurious phase A, why would the PRT parameters change?
Seal return isolates
27
What is expected to happen when you reset phase A?
CUVs start
28
What happens to rods if MPC-253 fails height?
Rods step out
29
What happens if MPC-253 fails low?
Rods step in
30
What happens if Tave Fails high?
Rods step in
31
What happens if PR Fails High?
Rods step in , but C2 prevents rods from stepping back out due to temp error
32
What happens if PR fails low or Tave fails low?
NO Rod motion
33
If 1 control rod falls into the core, what is affected?
Radial Power distribution. NOT SDM
34
If there is a dropped rod indicated, how should power reduction be made? And why?
Boration only to prevent exaggerating any existing flux tilts
35
What must you do if you have a dropped or misaligned rod?
SDM within 1 hour
36
While in Malfunction of a RCP, what is total # 1 seal flow?
Sum of #1 and #2 (RCDT In-Leakage)
37
Which CRID loss is the most survivable?
CRID 3
38
If Train A 250 VD is loss, does the Generator Trip in U1?
NO! Train A supplies 33 VED, so it doesn’t energize
39
Will a single ground on the generator field cause any harm?
No. However, a second groups could cause excessive field current and cause extensive damage
40
Why do we want to keep the generator connected to the grid until the turbine stop valves are closed?
So we don’t Overspeed the turbine
41
With a loss of CCW, the unaffected Unit will be needed to cross tie a system. Which system and why?
CVCS to maintain seal injection flow to the RCPs
42
If a PRZ Level channel fails high, what does QRV-251 do assuming no operator action?
Throttles to LESS than minimum charging, supply approximately 19 gpm seal injection flow
43
The Reactor should be trippped immediately if frequency falls belo:
58.2 Hz
44
If in M3 and there is a Loss of NESW, what is the required action and impact?
Stop ALL but 1 RCP and perform a pressure relief, containment chillers have lost cooling water
45
What is the RCP Trip Criteria per the RCP Malfunction FOP?
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
What is the RCP Malfunction criteria requiring a plant shutdown and stopping RCPs in < 8 hrs
#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
While at midloop, what must be done if RHR pump shows fluctuating amps and flow?
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
For a leaky PORV, what are the big pic procedure steps to identify which one?
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

5. NRC Prep (10 decks)

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