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CRDM Flashcards

1
Q

LCO 3.1.4 “Control Rod Alignment” requirement

A

All control rods, including their position indication channels, shall be operable and aligned to within 8” of all other rods in their respective group, and the control rod position deviation alarm shall be operable.

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2
Q

LCO 3.1.4 “Control Rod Alignment” applicability

A

Modes 1-2

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3
Q

LCO 3.1.4 “Control Rod Alignment” required action if 1 channel of rod position indication is inoperable for 1 or more control rods.

A

ONCE WITHIN 15 MINUTES FOLLOWING ANY ROD MOTION IN THAT GROUP, perform rod position verification (verification that rods are within 8” of each other for their group).

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4
Q

LCO 3.1.4 “Control Rod Alignment” required action if rod position deviation alarm is inoperable.

A

ONCE WITHIN 15 MINUTES OF MOVEMENT OF ANY CONTROL ROD, perform rod position verification (verification that rods are within 8” of each other for their group).

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5
Q

LCO 3.1.5 “Shutdown and Part-Length Control Rod Group Insertion Limits” requirement

A

All shutdown and part-length rod groups shall be withdrawn to >= 128”

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6
Q

LCO 3.1.5 “Shutdown and Part-Length Control Rod Group Insertion Limits” applicability

A

Mode 1
Mode 2 with any regulating rod withdrawn above 5”
Not applicable while performing rod exercise test

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7
Q

LCO 3.1.5 “Shutdown and Part-Length Control Rod Group Insertion Limits” required action if 1 or more shutdown or part-length rods not within limit

A

IMMEDIATELY declare affected control rod(s) inoperable and enter the applicable conditions and required actions of LCO 3.1.4

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8
Q

LCO 3.1.6 “Regulating Rod Group Position Limits” requirement

A

The PDIL alarm circuit and the CROOS alarm circuit shall be operable, and the regulating rod groups shall be limited to the withdrawal sequence, overlap, and insertion limits specified in the COLR.

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9
Q

LCO 3.1.6 “Regulating Rod Group Position Limits” applicability

A

Modes 1-2

Not applicable while performing rod exercise test

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10
Q

LCO 3.1.6 “Regulating Rod Group Position Limits” required action if PDIL or CROOS alarm circuit inoperable

A

ONCE WITHIN 15 MINUTES FOLLOWING ANY ROD MOTION, perform group position verification (verify each reg rod group is within its withdrawal sequence, overlap, and insertion limits).

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11
Q

How many control rods do we have?

A

45

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12
Q

How many shutdown rods do we have?

A

20 rods in 2 groups
Rods 1-12 in Group A
Rods 13-20 in Group B

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13
Q

How many reg rods do we have?

A 
21 rods in 4 groups
Rods 21-28 in Group 1
Rods 29-32 in Group 2
Rods 33-37 in Group 3
Rods 38-41 in Group 4
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14
Q

How many part-length rods do we have?

A

4 rods in 1 group (rods 41-45)

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15
Q

What is the normal rod withdrawal sequence?

A
  • All 4 groups start at 3”
  • Group 1 rods start moving first.
  • When Group 1 gets to 83”, Group 2 starts moving.
  • Once Group 1 is full out, Group 2 is moving alone from 51” to 83”.
  • When Group 2 gets to 83”, Group 3 starts moving.
  • Once Group 2 is full out, Group 3 is moving alone from 51” to 83”.
  • When Group 3 gets to 83”, Group 4 starts moving.
  • Once Group 3 is full out, Group 4 is moving alone from 51” to full out.
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16
Q

What condition(s) must be met for Group 1 rods to be sequenced either in or out?

A

Group 2 must be < 52”

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17
Q

What condition(s) must be met for Group 2 rods to be sequenced either in or out?

A
  • Group 1 must be > 80”

- Group 3 must be < 52”

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18
Q

What condition(s) must be met for Group 3 rods to be sequenced either in or out?

A
  • Group 2 must be > 80”

- Group 4 must be < 52”

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19
Q

What condition(s) must be met for Group 4 rods to be sequenced either in or out?

A

Group 3 must be > 80”

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20
Q

What are the 4 positions of the Rod Mode Selector Switch?

A

Manual Individual
Manual Group
Emergency Off
Manual Sequential

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21
Q

What is the function of the Manual Individual mode of operation?

A
  • Allows an individual rod to be selected for movement.
  • If moving part-length rods in Manual Individual and the individual rod selector switch for the part-length rods is in the “GR” position, then all part-length rods will move.
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22
Q

What is the function of the Manual Group mode of operation?

A

Select a single group of rods for movement

23
Q

What is the function of the Emergency Off mode of operation?

A
  • De-energizes all CRDM motors and brakes

- Give “Emergency Rod Drive Power Interrupt” alarm and “Rod Withdraw Prohibit” alarm

24
Q

What is the function of the Manual Sequential mode of operation?

A

Moves reg rods sequentially, when joystick is in the UP or DOWN position, with the rod program.

25
Q

What is the function of the Rod Group Selector Switch?

A

Selects which group of rods will be moved when in the Manual Group mode.

26
Q

What is the function of the Individual Rod Selector Switch(es)?

A
  • Selects which individual rod will move when in the Manual Individual mode, and its group is selected by the Rod Group Select Switch.
  • Selects the “target rod”, which is the rod that is displayed on the LED display, and is used for rod sequencing by PIP.
27
Q

What are the 3 control rod position indication systems?

A

PIP
SPI
Limit Switches

28
Q

What is the power supply for PIP?

A

Y-20

29
Q

What is the function of PIP?

A
  • Synchro-transmitter
  • inputs into the PIP Node
  • Displays on LED display
  • Displays on PPC
  • Inputs into the Rod Matrix Display
  • Used for rod sequencing
  • Accuracy is +/- 0.5”
30
Q

How does PIP input into the Rod Matrix Display?

A

PIP is used for the Upper and Lower Rod Stops, which feed indications on the Rod Matrix.

31
Q

What is the power supply for SPI?

A

Y-40

32
Q

What is the function of SPI?

A
  • Reed switches
  • Displays on PPC
  • Inputs in the Rod Matrix Display
  • Inputs to SPI Node
  • Accuracy is +/- 1.5”
33
Q

What happens to the control rods position indication on the PPC if PIP fails?

A

“RODMON” makes SPI the default PPC indication

34
Q

Why does SPI have a “dead band”?

A

Dead band around 9-16” due to structural support of the SPI.

35
Q

What is the function of the limit switches?

A
  • driven by the shaft that feeds PIP, but the shaft is a cam shaft that makes up 6 limit switches.
  • inputs into the shutdown and reg rods insertion and withdraw interlocks.
  • inputs to the Rod Matrix Display.
36
Q

What is the power supply for the Rod Matrix Display?

A

Y-01

37
Q

What are the rod matrix lights for the shutdown rods?

A
  • Green light - rod is withdrawn < 3” (comes from limit switch)
  • White light - rod is withdrawn > 3”, but < 122” (comes from limit switch)
  • Blue light - rod is withdrawn > 122” (PIP only)
  • Red light - rod is withdrawn > 131” (comes from PIP and SPI)
  • Both red and blue lights are on when rod is withdrawn > 131”
38
Q

What are the rod matrix lights for the regulating rods?

A
  • Green light - rod is withdrawn < 3”
  • White light - rod is withdrawn > 3”, but < 130”
  • Amber light - rod is withdrawn > 130”, but < 131”
  • Red light - rod is withdrawn > 131”
39
Q

What are the rod matrix lights for the part-length rods?

A
  • Green light - rod is withdrawn < 3”
  • White light - only on when rod is moving
  • Amber light - rod is withdrawn > 130”, but < 131”
  • Red light - rod is withdrawn > 131”
40
Q

What is the interlock between reg rods and shutdown rods?

A
  • Reg rods can’t be withdrawn until shutdown rods > 122” withdrawn (Tech Spec limit is 128” so interlock won’t prevent exceeding Tech Specs).
  • Shutdown rods can’t be inserted below 122” when any reg rod is > 6”.
  • Interlocks are bypassed when rods are operated in Manual Individual mode.
41
Q

What is the Lower Rod Stop?

A
  • Stops inward rod motion at 4” for reg rods and part-length rods.
  • Bypassed when rods are operated in Manual Individual mode.
42
Q

What is the Lower Electrical Limit?

A
  • Stops inward motion of shutdown and reg rods at 3”

- Stops inward motion of part-length rods at 0.5”

43
Q

What is the Upper Rod Stop?

A
  • Stops outward motion of reg rods and part-length rods at 130”
  • To get rods to 131” (full out), rods must be operated in Manual Individual mode
44
Q

What is the Upper Electrical Limit?

A

Stops all outward rod motion at 131”

45
Q

What is the function of Rod Withdraw Prohibit?

A

-Stops all rod motion

46
Q

What causes Rod Withdraw Prohibit?

A
  • High Power Rate Pre-Trip (1.5 DPM with power between 10E-4% and 15%)
  • Variable High Power Pre-Trip (2/4 logic)
  • Removal/failure of RPS Bistable High Power Rate Pre-Trip
  • Rod Mode Select Switch in EM OFF position
47
Q

What causes a “SPI Trouble” alarm?

A

Loss of SPI indication

48
Q

What causes a “Emergency Rod Drive Power Interrupt” alarm?

A

Rod Mode Selector Switch is in the EM OFF position

49
Q

What causes a “Shutdown Rod Position Abnormal” alarm?

A
  • Shutdown rod < 120”

- This is an indication the reg rods can’t be withdrawn due to the 122” interlock.

50
Q

What causes a “Rod Position 4 Inch Deviation” alarm?

A

4” difference between the highest and lowest rod in the group

51
Q

What causes a “Rod Position 8 Inch Deviation” alarm?

A

8” difference between the highest and lowest rod in the group.
This is the Tech Spec limit

52
Q

What causes a “Control Rod Out of Sequence” alarm?

A

Overlap is not within 78.5” to 81.5” band

53
Q

What causes a “PIP Trouble” alarm?

A

-Loss of PIP indications
This causes Rod Matrix lights to be unreliable, RODMON makes SPI the default indication on PPC, and a loss of sequencing for rods. LEDs will display -199.9.

54
Q

What causes a “Rod Drive Seal High Temperature” alarm?

A
  • Seal leakoff temperature > 200 F

- Indication of high CRD seal leakage.

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