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ATR SRO Level of Knowledge > Regulating Rod Control System > Flashcards

Regulating Rod Control System Flashcards

TRA00087

1
Q

What are the basic functions of the Reg Rod Control System?

A
  1. Control and maintain power between NL and NF
  2. Provide ability to change reactor power at a controlled rate.
  3. Provide mechanism for the reactor slow setback power reduction.
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2
Q

How does Reg Rod Control measure reactor power?

A

Via Ion Chamber instruments.

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3
Q

Describe ATR Ion Chambers.

A

Saturation region operation.
Argon/Nitrogen filled pressurized to 1 atm
1 inch in diameter
Boron lined to detect thermal neutrons

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4
Q

Where are the regulating rod ion chambers located in the thimbles?

A

T-3 and T-10 instrument thimbles

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5
Q

List limit switches associated with reg rods.

A

0 inches - lower limit of travel stops servo drive
12 inches - initiates auto insert of oscc
20 inches - auto insert oscc stops. withdraw permit locked out
42 inches - enables interlock for servo control to enter AUTO
48 inches - upper limit of travel stops servo drive

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6
Q

What is the approximate worth of an operating reg rod?

A

~0.25$ (0.01$ per inch)

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7
Q

What is the max rate of travel for a reg rod?

A

up to 50 inches/second

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8
Q

What parameter controls reg rod position when system is selected to MANUAL?

A

Controller moves the rod to match demand.

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9
Q

What determines the speed at which the reg rod moves?

A

Determined by degree of mismatch from controller to rod position (0.8 inches per second to 50 inches per second.)

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10
Q

What are the different functions of the reg rod control system?

A

Controls and maintains power
Provides mechanism for slow setback

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11
Q

What characteristic of the ATR allows control of total power by a single control rod?

A

ATR reactor is tightly coupled

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12
Q

What parameter controls reg rod position when control is in auto?

A

Controller positions the reg rod to maintain selected power.

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13
Q

How would the reg rod respond to a PALM experiment that added 0.1$ when inserted?

A

Inserting approximately 10 inches every time the PALM experiment moved in core.

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14
Q

How would the reg rod respond to a slow steady increase in PCS temp?

A

Slowly withdraw due to the negative temp coefficient of the reactor.

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15
Q

Where in ATR would the reg rod controller be found?

A

Two separate units for each reg rod system:
1. Dist Processor instrument rack in RCR behind uprights
2. Dist Processor located in the South 2nd basement

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16
Q

What components are located in the Distributed Processor Instrument Rack?

A

Ether net hub, controller, HMI, Ion Chamber chassis

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17
Q

What components are located in the Motor Driver/Brake Interface Chassis?

A

Circuit breaker panel, Termination panel, Reg Rod Brake Power Supply, Reg Rod Motor Driver

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18
Q

Where is the motor driver/brake interface chassis located?

A

South 2nd basement next to stairs to Rod Access

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19
Q

What is the function of the motor driver?

A

Provides input signals to the reg rod motor in response to velocity demand and direction signals from the controller.

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20
Q

What conditions will cause the motor driver’s protective circuitry to disable itself?

A

Short circuit, excess current, excess voltage

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21
Q

How does the Reg Rod Motor Brake operate?

A

Must be energized for brake to release.
Power causes it to release.
Interruption of voltage causes it to lock.

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22
Q

Reg Rod Brake will lock after a 1-5 second time delay following what?

A

Any Fatal Failure
Controller selected to HOT STANDBY
Controller in MANUAL with no insert or withdraw signal

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23
Q

What is the power supply to Reg Rod 1?

A

E-117 Instrument UPS to E-82

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24
Q

What is the power supply to Reg Rod 2?

A

E-117 Instrument UPS to E-83

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25
Q

Where are E-82/83 located?

A

Behind amplifier cabinets in the ATR RCR

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26
Q

What are the functions of the Ion Chamber interface chassis?

A

HV PS
Preamp
Pulse emitter
Output analog to digital converter

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27
Q

What reg rod info is sent to RDAS?

A

Rod position
Reactor power
Controller demand
Controller status

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28
Q

What is the function of the Relay Interface Panel?

A

Isolation between power and Reg Rod System
Communicate permissives and interlocks
Provides controller info to permissive bus.

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29
Q

What affect does Slow Setback have on selected reg rod system in AUTO?

A

Power reduced from Nf to Nl over 480 seconds

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30
Q

What is the effect of a slow setback signal on selected reg rod system in MANUAL?

A

Slow setback converted to a reverse and all OSCC and neck shims insert.

31
Q

What is the effect of Run Relay lost on reg rods if in AUTO?

A

Reg Rod will enter MANUAL mode
Brake locks
RO controls power with OSCCs

32
Q

How would reg rod system react if the operator entered a command for which the prerequisites were not met?

A

Controller would do nothing.

33
Q

Where can the position of selected reg rod be viewed?

A

Reactor uprights, control console

34
Q

System #1 controls the reg rod in what core position?

A

Southeast

35
Q

How is the desired reg rod control system selected?

A

System 1/2 selected on two-position switch

36
Q

What different modes of Reg Rod operation are available?

A

AUTO/MANUAL/HOT STANDBY

37
Q

What thimble is the ion chamber for Reg Rod 2?

A

Thimble 10

38
Q

How does reg rod position bar graph change color for position?

A

<12 or >42 inches - RED
12-20 inches - YELLOW
20-42 inches - GREEN

39
Q

What determines what control pop-ups appear in the aux display/entry area?

A

Controller mode change commands
Selected actions

40
Q

How to determine if reg rod CPU is active and working correctly?

A

Atom animation (disappears and red circle appears on failure)

41
Q

Define normalized power

A

Power assigned to the operator that relates ion chamber output to a percent of Nf

42
Q

Define demand power

A

Power the controller is presently calling for

43
Q

Define target power

A

Desired power level assigned by the operator

44
Q

Unselected Reg Rod controller can operate in what modes?

A

Hot Standby or Manual

45
Q

Reg rod controller in AUTO will change to what mode when deselected?

A

Manual

46
Q

Unselected reg rod controller in hot standby will change to what mode if selected?

A

Manual

47
Q

Can both reg rod controllers be set to Manual at the same time?

A

Yes

48
Q

How fast in the reg rod driven when manual motion switch is toggled if selected to hot standby?

A

Won’t move.

49
Q

What limitation are placed on magnitude of power normalized changes?

A

Done in steps of a factor of 5 or less.

50
Q

What is indicated by mode change select button for AUTO grayed out?

A

Prerequisites are not met.

51
Q

How does the operator know when the reg rod controller has changed modes?

A

Display changes

52
Q

What conditions must be met to enter AUTO mode?

A

Reactor power 1E-3 Nf
Selected reg rod >42 inches
Run permissive relay energized
Neck shim shutdown test block installed
No fatal or non-fatal failures

53
Q

Rate of change is linear or exponential?

A

Exponential

54
Q

While positioned within its operating range the reg rod is considered to be worth…

A

0.01$/inch

55
Q

What are the two general types of reg rod control system failures?

A

Fatal, non-fatal

56
Q

What is the basic difference between the two failure types?

A

Manual control still possible in non-fatal.

57
Q

How does reg rod system react to a non-fatal error?

A

Transfer to Manual, lock the brake

58
Q

What is the RO’s primary responsibility following a fatal or non-fatal failure?

A

Control power.

59
Q

What is required after a fatal failure to withdraw reg rod?

A

Management Approval

60
Q

How does the reg rod in AUTO respond to a scram.

A

Withdraws fully. At 1E-3 Nf Run relay is lost, reg rod goes to MANUAL and the brake locks

61
Q

How would the Regulating Rod Control system in AUTO respond to a reverse?

A

Controller goes to MANUAL and the brake locks

62
Q

How does reg rod in manual react to scram?

A

No change

63
Q

How does reg rod in Manual react to slow setback?

A

No change to controller mode or reg rod position. Setback would convert to a reverse and insert OSCC and neck shims.

64
Q

How would reg rod in AUTO react to slow setback?

A

Lower power at slow rate until the cause of the setback clears

65
Q

If the origin of a setback originated from experiment loops how would this change the response?

A

Auto power reduction would terminate at 3 Nl

66
Q

Expected response to reg rod controller failure?

A

Deselect failed channel.
Select alt channel in AUTO

67
Q

Threshold for abnormal reg rod movement?

A

3 inches or more abrupt, unexplained and sustained movement
Greater than 10 inches during insertion of HSIS

68
Q

What is the expected response to abnormal regulation rod movement?

A

Reduce power to <90% in 30 minutes

69
Q

What is expected operator response to a 16 inch or greater sustained and unexplained reg rod movement?

A

SCRAM immediately

70
Q

Two types of power variation surveillances at ATR?

A

Brush recording power variation checks
Power spectral density measurements

71
Q

What prevents manual reg rod withdrawal?

A

START
Safety rods or test block out
No fission chamber motion
Reverse
48 inch limit switch

72
Q

What kicks you out of AUTO?

A

Loss of RUN
Reverse
Fatal/non-fatal

73
Q
A

ATR SRO Level of Knowledge (17 decks)

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