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Weeks 3+4 Systems > CRD > Flashcards

CRD Flashcards

1
Q

How are regulating rods sequenced?

A

The top and bottom 20% of groups 5,6,7 are overlapped.

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2
Q

What are the main and secondary power supplies for CRD Rod Groups?

A

A (Main): B631

B (Secondary): A-501/ X-8

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3
Q

What phases are used to ‘Hold’ a CRDM?

A

‘A’ and ‘CC’

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4
Q

How many phases are needed to ‘Hold’ a CRDM?

A

1, but we provide 2 for redundancy

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5
Q

What is the purpose of the ball check valves on the motor tube?

A

Ball check valves are only with the control rods (Safeties, and Control Groups 1-7) Required
for water volume replacement during a reactor trip.

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6
Q

What is the purpose of the synchronizing bearing?

A

Ensures the segment arms are equally pulled apart

for magnetic coupling and full engagement of the roller nuts.

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7
Q

What is the purpose of the torque taker?

A

Prevents the Leadscrew from rotating to provide

linear motion in and out of the core.

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8
Q

What is the order for rotating the CRDM to generate IN or OUT rod motion?

A

3-2-3-2 (2-3-2-3)

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9
Q

What is CRDM max stator temp?

A

180F

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10
Q

What is max cooling water temp entering the CRD?

A

120F

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11
Q

What is the min allowable cooling water temp?

A

60F

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12
Q

What is allowed max CRD travel? (hi temp implications)

A

420”/hr

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13
Q

What is allowed max CRD run time? (hi temp implications)

A

30min/hr

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14
Q

What is the CRDM Stator Hi Temp Computer Alarm setpoint?

A

113F

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15
Q

How many CRD Stator Group temperatures above 180F require tripping the reactor?

A

> 1

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16
Q

What are the 2 rod speeds?

A

“RUN” is 30”/minute

“JOG” is 3”/minute

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17
Q

What would happen if rod control receives simultaneous IN and OUT commands?

A

IN commands override OUT commands

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18
Q

What would happen if rod control receives simultaneous commands for 2 different rod speeds?

A

HOLD command

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19
Q

When will Diverse Reactor Overpressure Prevention System (DROPS) de-energize the CRDM gate drives?

A

RCS pressure >2430psig

20
Q

To ensure all Control Rod Drives are de-energized on a reactor trip, what are all of the possible combinations of CRD breaker/electronic positions to remove all power from the CRDM’s?

A 
A and B
or
C&E and D&F
or 
A and D&F
or 
B and C&E
21
Q

What are 2 separate means of tripping a CRDM breaker?

A

UV and Shunt

22
Q

What are 2 separate means of tripping a CRDM breaker?

A

UV and Shunt

23
Q

How many rod position indications are required to be operable per Tech Specs?

A

1 of 3
API
RPI
Zone

24
Q

What conditions generate an ‘OUT’ Inhibit?

A
  • Loss of System Power (24VDC, 15VDC, 5VDC: Comes from RS-3, RS-4)
  • Loss of power to DC Hold
  • Loss of air flow in the DC hold cabinets
  • Overheat of the 480VAC Voltage Regulator
25
Q

What conditions generate ‘Sequence’ Inhibit?

A 
GR6>5% AND GR5<80%
GR7>5% AND GR5<80%
G7>5% AND GR5<95%
GR6<95% AND G7>20%
GR5<95% AND GR6>20%
26
Q

What will prevent the Diamond Panel from going to AUTO?

A
  • Auto Inhibit
  • Sequence Inhibit
  • Reactor Trip Confirmed
27
Q

What will reject the Diamond Panel to MANUAL?

A

Loss of ICS Power

28
Q

What condition will light up the APSR OVERLAP Light?

A

Group 6 within 2% of the top of the poison section of Group 8 (Power Peaking Concern)

29
Q

What interlocks are the Safety Rods Out Limits tied to?

A
  • Asymmetric Rod Runback
  • Auto Inhibit
  • Out Inhibit
  • Feed and Bleed
  • Sequence Enable
  • Out Command
30
Q

How many rod out limits are needed to stop outward rod motion of that group?

A

1 (Out Limit Light on the Diamond and PI panel)

31
Q

What does it mean when the CONTROL ON Light is illuminated on the Diamond Panel?

A

Command Enabled or Selected for Transfer

32
Q

What is the purpose of the IN LIMIT BYPASS (LATCH) Switch on the Diamond Panel?

A

Bypasses IN LIMITS for latching (Groups 1-7)

33
Q

After transferring a rod group back to the group power supply from the aux power supply, what completes the logic to allow another rod group to be selected?

A

Transfer Reset (TR CF light must go out)

34
Q

How do you know there are no rods or rod groups on the Aux Power Supply?

A

TR CF light will be out

35
Q

FAULT RESET will reset what faults?

A
  • Asymmetric Rod Fault
  • Out Inhibit
  • System Power
  • Motor Power
36
Q

TRIP RESET resets the CRD trip condition and energizes rod motors if what conditions are met?

A
  • GR 1-7 In Limits
  • RPS Reset
  • CRDM Cooling Flow
37
Q

What is required to bypass Safety Group Out Limit interlocks with GR 5-7 for an OUT command or SEQ?

A

Keyswitch upstairs in the Comp Room

38
Q

What does MAN TRANS accomplish on the Diamond Panel?

A

Pulses the rod transfer switches to change power supplies

39
Q

What does the SY light being illuminated mean?

A

Phases between the Aux Supply and Group Supply match

40
Q

What is the purpose of the SEQ OR button?

A

Enables rotary selector switches (excl. GR8)

41
Q

What is the purpose of the GROUP/ AUXIL button?

A

Refers to the Group or Aux Power Supplies

42
Q

What will cause Auto Inhibit if ICS is in Manual?

A
  • > +-1% Neutron Error
  • Loss of ICS Power
  • Loss of Safety Group Out Limit
43
Q

What causes the Fault Light on the PI Panel?

A

5% Asymmetric Alarm

44
Q

As indicated in the CRD system logic cabinets, each CRDM has ________ absolute zone reference switches, NOT counting the “out limit” and an “in limit” switches

A

5

45
Q

If breaker B631 opened while operating at 100% power, the response of the Control Rod Drive system would be:

A

No effect on regulating rods, safety rods held by a single phase (CC)

Weeks 3+4 Systems (5 decks)

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