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ILT Systems > Permissives / Control Interlocks > Flashcards

Permissives / Control Interlocks Flashcards

1
Q
  • Permissives / Control Interlocks*
    • *

What is the P-4 Permissive?

A

P-4 (Reactor Trip)
Rx Trip AND Bypass Breakers Open

Functions:

  • Trips Main Turbine
  • Feedline Isolation (w/ Tavg LO [564 °F])
  • Prevents SI re-actuation after SI reset
  • Transfers steam dumps from load rejection to plant trip
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2
Q
  • Permissives / Control Interlocks*
    • *

What is the P-6 Permissive?

A

P-6 (Source Range)
IR > 1x10-10 amps [1/2]

Function: Allows MANUAL block of SR Neutron Flux-HI Rx Trip (1x105 CPS [1/2])

  • Note: AUTO Block of SR Neutron Flux-HI occurs at P-10 (PR > 10%) [2/4].*
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3
Q
  • Permissives / Control Interlocks*
    • *

What is the P-7 Permissive?

A

P-7 (At Power Permissive)
P-10 or P-13 [1/2]

Functions: AUTO unblocks the following Rx Trips:

  • Pressurizer Pressure- LO (1885 PSIG [2/4])
  • Pressurizer Level-HI (92%) [2/3]
  • RCP UV (10584 VAC) [1/2 RCPs on 2/2 Buses]
  • RCP UF (57.2 HZ) [1/2 RCPs on 2/2 Buses]
  • RCS Flow-LO (90%)
    ​[2/3 on (2/4 < P-8) OR (1/4 > P-8)]
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4
Q
  • Permissives / Control Interlocks*
    • *

What is the P-8 Permissive?

A
  • *P-8 (Loop Flow Permissive)**
  • *PR > 48% [2/4]**

Functions: AUTO changes coincidence of RCS Flow-LO (90%)

  • > P-8 [2/3 on 1/4]
  • < P-8 [2/3 on 2/4]
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5
Q
  • Permissives / Control Interlocks*
    • *

What is the P-9 Permissive?

A

P-9 ( Turbine Trip / Rx Trip)
PR > 50% [2/4]

Function: AUTO unblocks Rx Trip on Turbine Trip

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6
Q
  • Permissives / Control Interlocks*
    • *

What is the P-10 Permissive?

A
  • *P-10 (Nuclear at Power Permissive)**
  • *PR > 10% [2/4]**

Functions:

  • Input to P-7
  • AUTO blocks SR Neutron Flux-HI (1x105 CPS) [1/2]
  • Allows MANUAL block:
    • IR Neutron Flux-HI (25%) [1/2]
    • PR Neutron Flux-LO (25%) [2/4]
    • C-1 (20%) [1/2]
  • Note: MANUAL Block of SR Neutron Flux-HI performed at P-6 (IR > 1x10-10 AMPS) [1/2].*
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7
Q
  • Permissives / Control Interlocks*
    • *

What is the P-11 Permissive?

A

P-11 (Pressure SI Permissive)
< 1970 PSIG [2/3]

Functions:

Allows MANUAL Block:

  • PZR Pressure-LO (1885 PSIG) [2/4]
  • (Rx Trip)*
  • MSL Pressure-LO (615 PSIG) [2/3 on 1/4]
  • (SI / SLIS)*
  • ​Note: > P-11 AUTO unblocks PZR Pressure-LO and MSL Pressure-LO*
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8
Q
  • Permissives / Control Interlocks*
    • *

What is the P-12 Permissive?

A
  • *P-12 (Tavg LO-LO Permissive)**
  • *550ºF [2/4]**

Function: Blocks Steam Dumps

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9
Q
  • Permissives / Control Interlocks*
    • *

What is the P-13 Permissive?

A

P-13 (Turbine at Power Permissive)
P<span>imp</span> > 10% [1/2]

Function: Input to P-7

  • Note: OTO-SA-00001 lists P<span>imp</span> > 60 psig [1/2]*
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10
Q
  • Permissives / Control Interlocks*
    • *

What is the P-14 Permissive?

A

P-14 (S/G Level HI Permissive)
SG NR Level > 91% [2/4 on 1/4]

Functions:

  • FWIS
  • Trips Main Turbine
  • Trips MFPs
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11
Q
  • Permissives / Control Interlocks*
    • *

What is the C-1 Control Interlock?

A

C-1 (IR Rod Stop)
20% IR amps [1/2]

Function: Prevents MANUAL rod withdrawal.

  • Note: MANUAL rod insertion and AUTO rod withdrawal / insertion are not effected.*
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12
Q
  • Permissives / Control Interlocks*
    • *

What is the C-2 Control Interlock?

A

C-2 (PR Rod Stop)
103% [1/4]

Function: Prevents MANUAL rod withdrawal.

  • Note: MANUAL rod insertion and AUTO rod withdrawal / insertion are not effected.*
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13
Q
  • Permissives / Control Interlocks*
    • *

What is the C-3 Control Interlock?

A

C-3 (OTΔT Rod Stop)
OTΔT Setpoint -2% [2/4]

Function:

  • Prevents MANUAL rod withdrawal.
  • Causes main turbine runback
  • Note: MANUAL rod insertion and AUTO rod withdrawal / insertion are not effected.*
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14
Q
  • Permissives / Control Interlocks*
    • *

What is the C-4 Control Interlock?

A

C-4 (OPΔT Rod Stop)
OPΔT Setpoint -2% [2/4]

Function:

  • Prevents MANUAL rod withdrawal.
  • Causes main turbine runback
  • Note: MANUAL rod insertion and AUTO rod withdrawal / insertion are not effected.*
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15
Q
  • Permissives / Control Interlocks*
    • *

What is the C-5 Control Interlock?

A

C-5 (Low Power Interlock)
P<span>imp</span> < 15% [1/1]

Function: Original plant design stopped AUTO rod withdrawal.

  • Note:*
  • PT-0505 only
  • Removed by CMP 95-1008.
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16
Q
  • Permissives / Control Interlocks*
    • *

What is the C-7 Control Interlock?

A

C-7 (Loss of Load Interlock)
P<span>imp</span> 10% Step [1/1]
OR
P<span>imp</span> 5%/min decrease [1/1]

Function: Arms steam dumps in Tavg mode after a load rejection.

  • Note: PT-0506 only*
17
Q
  • Permissives / Control Interlocks*
    • *

What is the C-9 Control Interlock?

A

C-9 (Condenser Interlock)
Condenser Pressure < 6.0” Hg Abs [2/2 per shell]

Function: Condenser available for steam dump.

18
Q
  • Permissives / Control Interlocks*
    • *

What is the C-11 Control Interlock?

A

C-11 (Control Bank D Rod Withdrawal Limit)
223 Steps

Function: Original plant design stopped AUTO rod withdrawal.

  • Note:* Removed by CMP 95-1008.
19
Q
  • Permissives / Control Interlocks*
    • *

What is the C-20 Control Interlock?

A

C-20 (AMSAC)
Pimp ≥ 40% [2/2]

Function: AUTO arms AMSAC

  • Notes:*
  • PT-0505 and PT-0506
  • Following Rx Trip (Pimp < 40%) there is a 360 sec TD for AMSAC to clear.

ILT Systems (3 decks)

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