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Systems Test 3 > LOT 201.18 Rod Control > Flashcards

LOT 201.18 Rod Control Flashcards

1
Q
  • LOT 201.18 Rod Control*
    • *

How many rods can the DC hold power supply hold?

A

1 Group (4 Rods)

  • Allows for maintenance on control circuits.
  • Powered from load side of RTBs.
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2
Q
  • LOT 201.18 Rod Control*
    • *

When performing a Rx startup, how many steps until bank overlaps begin?

A

137 steps

  • Control Bank A at 137 steps, Control Bank B will begin to lift.
  • Process repeated for control bank C and control bank D.
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3
Q
  • LOT 201.18 Rod Control*
    • *

What is the purpose of the lift coil disconnect switches?

A
  • *Allows disabling of individual rod’s lift coil**
  • Permits re-aligning rod to group*

Located in cabinet behind CP004

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4
Q
  • LOT 201.18 Rod Control*
    • *

How is the Terror signal generated in the Rx Control Unit?

A
  • Terror = (Tref - Tave) + (Turb Load - NI power)*
  • *Tref → Turbine Impulse Pressure (PT-505)**
  • *Tave → Auctioneered High Tave (T-412A/422A/432A/442A)**
  • *Turb Load → Turbine Impulse Pressure (PT-505)**
  • *NI Power → Auctioneered High PR NIs (NI-41/42/43/44)**
  • Turbine Load - NI Power Portion:*
  • *Used for fast response during transients / load stability**
  • *Passes through Rate comparator**
  • Rate of change produces error output*
  • Steady state results in no output*

Note:
Terror meter on CP005

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5
Q
  • LOT 201.18 Rod Control*
    • *

How many control rods are in each bank?

A
  • Control Banks*
  • *A: 8 (4/4)**
  • *B: 8 (4/4)**
  • *C: 8 (4/4)**
  • *D: 5 (2/3)**
  • S/D Banks:*
  • *A: 7 (4/3)**
  • Unit 2: 8 (4/4)*
  • *B: 8 (4/4)**
  • *C: 4**
  • *D: 4**
  • *E: 4**

Rod D-6 in SD Bank A Group 2 was removed for Unit 1

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6
Q
  • LOT 201.18 Rod Control*
    • *

What provides an accurate indication of control rod bank step count positions by counting the up down pulses from the Rx Control Unit?

A

Pulse to Analog Converter

Located in back of DC hold cabinet.

  • Note:*
  • During Rx S/U, resets when operators reset the S/U Switch.
  • During Dropped rod, have to use manual mode to reset bank to height of dropped rod
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7
Q
  • LOT 201.18 Rod Control*
    • *

What are the design transients for the Control Rods?

A
  • 15% - 100% Rx Power:*
  • *± 10% step load change**
  • *± 5% / min load change**
  • *50% Load Reduction**
  • Need steam dumps also*
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8
Q
  • LOT 201.18 Rod Control*
    • *

What is the purpose of using bank overlap?

A

Gives more uniform reactivity rate

  • Used for the control banks ONLY.
  • S/D banks not overlapped b/c they will not be used while critical.
  • Note:*
  • The bank selector switch must be in Auto or manual to maintain bank overlaps during rod movement.*
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9
Q
  • LOT 201.18 Rod Control*
    • *

What causes a rod control power cabinet urgent failure?

A
  • *Logic Error**
  • 0 Current sent to stationary and movable grippers at same time*
  • *Regulation Error**
  • Current doesn’t match order or Full current for too long*
  • *Phase Failure**
  • Excessive voltage ripple*
  • *Multiplex Error**
  • Wrong rod getting current*
  • *Rod Holdout switches out of position**
  • *Loose Circuit Card**
  • Stops Auto/Manual rod motion
  • Individual Bank rod motion will still work
  • Sends reduced current signal to affected group movable/stationary grippers
  • Note:*
  • Non-Urgent is a loss of 1 of the 4 power supplies and will not affect system operation.*
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10
Q
  • LOT 201.18 Rod Control*
    • *

What causes a rod control logic cabinet urgent failure?

A
  • *Pulser Failure**
  • *Slave Cycle Input Failure**
  • Slave receive “Go” signal before last step done*
  • *Loose circuit card**
  • Stops Auto/Manual rod motion
  • Individual Bank rod motion will still work
  • Sends reduced current signal to affected group movable/stationary grippers
  • Note:*
  • Non-Urgent is a loss of 1 of the 6 power supplies and will not affect system operation.*
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11
Q
  • LOT 201.18 Rod Control*
    • *

What is the rod speed for each control rod during auto and manual control?

A

Control Banks:

  • *Terror 1.5 ˚F - 3 ˚F:**
  • *6 steps/min**
  • *Terror 3 ˚F - 5 ˚F:**
  • *Linear slope (6 - 72 steps/min)**
  • *Terror ≥ 5 ˚F:**
  • *72 steps/min**
  • *Manual:**
  • *68.5 steps/min**
  • S/D Banks:*
  • *68.5 steps/min**
    • Terror results in outward rod movement
    • Terrror results in inward rod movement
  • Note:*
  • Once ± 1.5 Terror reached rods with continue to shim until ± 1 Terror reached.*
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12
Q
  • LOT 201.18 Rod Control*
    • *

What is the RDMG’s output voltage and frequency?

A

260 VAC

59 Hz

Prevents alternate power supply connection

  • Note:*
  • Control switches to operate RDMGs are on local control panel only.*
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13
Q
  • LOT 201.18 Rod Control*
    • *

What is the advantage of having a sliding Tave program?

A

Maintains Steam Pressure Constant while:

  • Limiting PZR Size
  • Limiting Reactivity Change
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14
Q
  • LOT 201.18 Rod Control*
    • *

What happens to movable, stationary, and lift coils during a rod withdrawal?

A
  • *Full Current on Stationary**
  • *Energize Movable**
  • *De-energize Stationary**
  • Rod drops slightly (all load on Movable)*
  • *Full Current on Lift**
  • Rod moves 5/8”*
  • *Full Current on Stationary**
  • *Lower Current on Lift**
  • Allow rod to latch properly*
  • *De-energize Movable**
  • *De-energize Lift**
  • Movable will drop to bottom of rod*
  • *Lower Current on Stationary**
  • Rod will drop 1/16”*
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15
Q
  • LOT 201.18 Rod Control*
    • *

What powers the RDMG sets?

A
  • *LC 1K1**
  • Powered from 1G Aux Bus*
  • *LC 1L1**
  • Powered from 1H Aux Bus*

Has heavy flywheel to allow RDMGs to ride through 1 sec loss of power.

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16
Q
  • LOT 201.18 Rod Control*
    • *

What does the Rod Control Startup Switch reset?

A
  • POSSUM:*
  • *P/A Converter**
  • *Bank Overlap Unit**
  • *Step Counters**
  • *Slave Cyclers**
  • *Urgent Failures**
  • *Master Cycler**

Located on CP005.

17
Q
  • LOT 201.18 Rod Control*
    • *

What happens to movable, stationary, and lift coils during a rod instertion?

A
  • *Full Current on Stationary**
  • *Full Current on Lift**
  • Movable Coil moves to top of Rod*
  • Does NOT move rod since de-energized*
  • *Energize Movable**
  • *Lower Current on Lift**
  • Allow rod to latch properly*
  • *​De-energize Stationary**
  • Rod drops slightly (all load on Movable)*
  • *De-energize Lift**
  • *Rod will lower 5/8”**
  • *Full Current on Stationary**
  • *De-energize Movable**
  • *Lower Current on Stationary**
  • Rod will drop 1/16”*

Systems Test 3 (17 decks)

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