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NRC Review > Permissive / Control Interlocks > Flashcards

Permissive / Control Interlocks Flashcards

1
Q
  • Permissive / Control Interlocks*
    • *

What is the P-6 permissive interlock?

A

IR NIs ≥ 1x10-10 Amps [1/2]

Will auto unblock SR NIs ≤ 5x10-11 Amps [2/2]

CP005 lampbox light lit when IR NIs ≥ P-6

  • Functions:*
  • *Blocking SR Flux - High (1x105 CPS) [1/2]**

Manual Block ↑
Auto Block (P-10) [2/4]

Auto Unblock ↓

  • Note:*
  • Blocking SR Flux - High will de-energize SR NIs.*
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2
Q
  • Permissive / Control Interlocks*
    • *

What is the P-14 permissive interlock?

A

SGNR Level (≥ 87.5%) [2/4 on 1/4]

Not on CP005 permissive lampbox.

Functions:

Trips Turbine

Trips MFPs

Trips SUFP

  • Note:*
  • Can be reset if P-14 clears and P-4 FALSE*
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3
Q
  • Permissive / Control Interlocks*
    • *

What is the P-16 permissive interlock?

A

P-4 [1/2]

OR

Rx trip logic signal from SSPS [1/2]

Not on CP005 permissive lampbox.

Function:
Trips Turbine

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4
Q
  • Permissive / Control Interlocks*
    • *

What is the C-8 control interlock?

A

EH Pressure < 1245.8 psig [2/3]
OR
TV Valves Closed [2/4]

Not on CP005 permissive lampbox.

Functions:

Rx Trip w/ P-9 (PR NIs ≥ 50% [2/4])

MG Trip

Arms Steam Dumps in Trip mode
Tavg mode w/ no load setpoint (567 ˚F)

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5
Q
  • Permissive / Control Interlocks*
    • *

What is the C-17 control interlock?

A
  • *100% Tavg (9.3 ˚F - 20 ˚F) < Tref *****
  • *OR**
  • *Tavg< 563 ˚F**

Not on CP005 permissive lampbox.

Function:

Blocks raising turbine load

Note:

Tavg/Tref setpoint determined on 100% Auctioneered Low Tavg

  • 582.3 ˚F → 9.3 ˚F
  • 593 ˚F → 20 ˚F
  • (Linear Scale)
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6
Q
  • Permissive / Control Interlocks*
    • *

What is the C-20 control interlock?

A
  • *Impulse Pressure > 30% [2/2]**
  • PT-505 AND PT-506*
  • CP005 lampbox light lit when ≤ C-20.
  • Will remain armed for 360 sec after falling below 30% impulse pressure

Function:
Arms AMSAC
(ATWS circuitry)

  • Note:*
  • 30% impulse pressure ≈ 40% NI power*
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7
Q
  • Permissive / Control Interlocks*
    • *

What is the P-4 permissive interlock?

A

Respective Safety Train’s:
Rx Trip Breaker Open
AND
Rx Trip Bypass Breaker Open

Resetting SI:
Rx Trip Breakers Open [2/2]
AND
Rx Trip Bypass Breakers Open [2/2]

CP005 lampbox light lit when P-4 True.

Functions:
Turbine Trip
Isolates S/G BD (if SR Flux trip blocked)
FWI on Tavg - Low (574 ˚F)
Blocks / Reset SI
[2/2 AND 2/2]

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8
Q
  • Permissive / Control Interlocks*
    • *

What is the P-7 permissive interlock?

A

P-10 (PR NI’s ≥ 10%) [2/4]
OR
P-13 (Turbine Impulse Pressure ≥ 10%) [1/2]
PT-505 OR PT-506

CP005 lampbox light lit when < P-10 AND < P-13.

Permissive for Rx Trips:

PZR Pressure - Low (1870 psig) [2/4]

PZR Level - High (92%) [2/4]

RCS Flow - Low (91.8%)

  • w/ P-8 [2/3 on 2/4]*
  • w/o P-8 [2/3 on 1/4]*

RCP UF (57.2 Hz) [2/4]

RCP UV (72.6% for 1.5 sec) [2/4]

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9
Q
  • Permissive / Control Interlocks*
    • *

What is the P-8 permissive interlock?

A

PR NIs ≥ 40% [2/4]

CP005 lampbox light lit when < P-8.

Functions:

PR NIs < 40% [3/4]
Rx Trip: RCS Flow - Low (91.8%) [2/3 on 2/4]

PR NIs ≥ 40% [2/4]
Rx Trip: RCS Flow - Low (91.8%) [2/3 on 1/4]

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10
Q
  • Permissive / Control Interlocks*
    • *

What is the P-9 permissive interlock?

A

PR NIs ≥ 50% [2/4]

CP005 lampbox light lit when < P-9.

Function:
Trips the Rx on Turbine Trip

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11
Q
  • Permissive / Control Interlocks*
    • *

What is the P-10 permissive interlock?

A

PR NIs ≥ 10% [2/4]

CP005 lampbox light lit when ≥ P-10.

Permissive:

Manual Block C-1 (IR NIs >20%) [1/2]
Stops all rod out motion

Manual Block PR Flux High - Low (25%) [2/4]

Manual Block IR Flux - High (25%) [1/2]

Auto Blocks SR Flux - High (1x105 cps) [1/2]

Input to P-7

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12
Q
  • Permissive / Control Interlocks*
    • *

What is the P-11 permissive interlock?

A
  • *PZR Pressure ≥ 1985 psig [2/3]**
  • PT-458 does NOT go into P-11*

CP005 lampbox light lit when < P-11.

PZR Pressure

Blocks SI / SLI Signals
PZR Pressure - Low (1857 psig) [2/4]
Steam Pressure - Low (735 psig) [2/3 on 1/4]

Allows closure of SI Accumulator outlet valves

PZR Pressure ≥ 1985 psig [2/3]

AUTO Opens SI Accumulator outlet valves

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13
Q
  • Permissive / Control Interlocks*
    • *

What is the P-12 permissive interlock?

A

Tavg < 563 ˚F [2/4]

CP005 lampbox light lit when < P-12.

Functions:

Blocks Steam Dump Operations

Vents air from steam dump operators

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14
Q
  • Permissive / Control Interlocks*
    • *

What is the P-13 permissive interlock?

A
  • *Turbine Impulse Pressure ≥ 10% [1/2]**
  • PT-505 OR PT-506*

CP005 lampbox light lit when < P-13.

Function:

Input to P-7

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15
Q
  • Permissive / Control Interlocks*
    • *

What is the C-1 control interlock?

A

IR NIs > 20% [1/2]

Not on CP005 permissive lampbox.

Function:

Stops MANUAL AND AUTO outward rod motion
Manual Blocked > P-10
Auto Unblock ≤ P-10

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16
Q
  • Permissive / Control Interlocks*
    • *

What is the C-2 control interlock?

A

PR NIs > 103% [1/4]

Not on CP005 permissive lampbox.

Function:

Stops MANUAL AND AUTO outward rod motion

17
Q
  • Permissive / Control Interlocks*
    • *

What is the C-3 control interlock?

A

OT∆T < 1.5% of setpoint [2/4]

CP005 lampbox light lit when C-3 True.

Function:

Stops MANUAL AND AUTO outward rod motion

18
Q
  • Permissive / Control Interlocks*
    • *

What is the C-4 control interlock?

A

OP∆T < 1.5% of setpoint [2/4]

CP005 lampbox light lit when C-4 True.

Function:

Stops MANUAL AND AUTO outward rod motion

19
Q
  • Permissive / Control Interlocks*
    • *

What is the C-5 control interlock?

A

Turbine Impulse Pressure < 15% [1/1]
PT-505

Not on CP005 permissive lampbox.

Function:

Stops AUTO outward rod motion

20
Q
  • Permissive / Control Interlocks*
    • *

What is the C-7 control interlock?

A

Impulse Pressure > 10% Step load loss [1/1]
PT-506

OR

Impulse Pressure > 5%/min load loss [1/1]
PT-506

CP005 lampbox light lit when C-7 True.

Functions:

If C-9 TRUE AND Steam dumps in Tavg mode, then arms steam dumps

21
Q
  • Permissive / Control Interlocks*
    • *

What is the C-9 control interlock?

A

Condenser Vacuum > 22” Hg [2/3]
AND
CW Breaker Closed [1/4]

CP005 lampbox light lit when C-9 True.

Function:

Allows Steam dump operation

22
Q
  • Permissive / Control Interlocks*
    • *

What is the C-11 control interlock?

A

Control Bank D ≥ 248 steps

CP005 lampbox light lit when C-11 True.

Function:

Stops AUTO outward rod motion

NRC Review (7 decks)

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