Rod Control Flashcards

1
Q

Design basis of Rod Control

A
  • 10% step, 5%/min and maintain Tave w/in 5 deg of Tref (not challenge protection system)
  • 95% LR, w/ SDCS (power in house loads w/o trip)
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2
Q

Safety functions of Rod Control

A
  • operate w/ speed low enough ensure reactivity addition rate limited upon failure
  • maintain RCS integrity (CRDMs part of RCS Press boundary)
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3
Q

Withdrawal sequence of CRDM

A
0- sc-energized,   mc/lc-de energized 
1- mc-energizes
2- sc-de energizes
3- lc-energizes (Rod moves 5/8")
4- sc-energizes
5- mc-de energizes
6- lc-de energizes
0- sc-energized, mc/lc-de energized
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4
Q

primary purpose of RCU(Rod Control unit)

Logic cabinets

Power cabinets

A

Determine the speed and direction signals of automatic Rod movement

Sends appropriate current order to power cab

Takes current order to cause rods to move

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5
Q

What are two sections that RCU breaks its logic into?

A

Demand- Tave vs. Tref

Anticipatory- Prx vs. Pturb (rate)

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6
Q

What are the inputs to RCU?

A

Auctioneered high Ni’s (N41-N44)=> Prx

MSS Impulse pressure (PT-505A, 506A, 8)=>Pturb & Tref

Auctioneered high Tave

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7
Q

Total error summer/ speed & direction programmer layout

A
  • starts movement @ +/- 1.5 deg
  • stops movement @ +/- 1 deg

1-3 deg error -> 8 steps/min
3-5 deg error -> 8-72 steps/min
>5 deg error -> 72 steps/ min

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8
Q

Power supplies to Rod Control

A

13 D ( mg11)

13 E (mg12)

PJ-13 (lighting panel)

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9
Q

What is done with Rod Control and rods themselves to minimize wear of control rods when operating ARO

A

Full out position is varied from 225 to 231 steps over life of control rods

During refueling rods are rotated 90 or 270 deg periodically

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10
Q

Purpose of P to A converter?

A

Count CB D up and down steps to feed into C-11 Rod stop at > 220 steps

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11
Q

Describe inputs and set points of RIL monitor

A

Inputs- auctioneered hi delta T( ind of power)
- bank demand

Compares what power is and what the RIL is for that power to bank demand

RIL- Lo ( RIL + 10 steps)

RIL- Lo-Lo (RIL)

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12
Q

What can give you non-urgent failure alarm?

Is Rod movement still possible?

A

Loss of either power supply to Rod Control

Yes

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13
Q

What can give you urgent failure in power cabinet?

Is Rod movement still possible?

A

Regulation failure- demand current not equal act current
Phase failure- one phase to coils failed
Logic error- 0 demand to s.c. and m.c.
Multiplex error- no demand and act current

Only individual bank control is available on non-affected cabinets

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14
Q

What can give you urgent failure in logic cabinet?

Is Rod movement still possible?

A

Pulses/oscillator failure-
Slave cycles failure-

All modes of Rod movement prevented
(Except SCD, b/c separate pulses)

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