Permissive / Control Interlocks Flashcards Preview

Review > Permissive / Control Interlocks > Flashcards

Flashcards in Permissive / Control Interlocks Deck (22):
1

Permissive / Control Interlocks


What is the P-6 permissive interlock?

IR NIs ≥ 1x10-10 Amps [1/2]


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

CP005 lampbox light lit when IR NIs ≥ P-6


Functions:

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

Auto Unblock ↓


Note:
Blocking SR Flux - High will de-energize SR NIs.

2

Permissive / Control Interlocks


What is the P-14 permissive interlock?

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

3

Permissive / Control Interlocks


What is the P-16 permissive interlock?

P-4 [1/2]

OR

Rx trip logic signal from SSPS [1/2]


Not on CP005 permissive lampbox.


Function:
Trips Turbine

4

Permissive / Control Interlocks


What is the C-8 control interlock?

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)

5

Permissive / Control Interlocks


What is the C-17 control interlock?

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)

6

Permissive / Control Interlocks


What is the C-20 control interlock?

Impulse Pressure > 30% [2/2]
PT-505 AND PT-506


CP005 lampbox light lit when ≤ C-20.


Function:

Arms AMSAC
(ATWS circuitry)


Note:
30% impulse pressure ≈ 40% NI power

7

Permissive / Control Interlocks


What is the P-4 permissive interlock?

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

A image thumb
8

Permissive / Control Interlocks


What is the P-7 permissive interlock?

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]

A image thumb
9

Permissive / Control Interlocks


What is the P-8 permissive interlock?

PR NIs ≥ 40% [2/4]


CP005 lampbox light lit when < P-8.


Functions:

PR NIs
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]

A image thumb
10

Permissive / Control Interlocks


What is the P-9 permissive interlock?

PR NIs ≥ 50% [2/4]


CP005 lampbox light lit when < P-9.


Function:
Trips the Rx on Turbine Trip

A image thumb
11

Permissive / Control Interlocks


What is the P-10 permissive interlock?

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 - Low (25%) [2/4]

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

Input to P-7

A image thumb
12

Permissive / Control Interlocks


What is the P-11 permissive interlock?

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

A image thumb
13

Permissive / Control Interlocks


What is the P-12 permissive interlock?

Tavg < 563 ˚F [2/4]


CP005 lampbox light lit when < P-12.


Functions:

Blocks Steam Dump Operations

Vents air from steam dump operators

A image thumb
14

Permissive / Control Interlocks


What is the P-13 permissive interlock?

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


CP005 lampbox light lit when < P-13.


Function:

Input to P-7

A image thumb
15

Permissive / Control Interlocks


What is the C-1 control interlock?

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

A image thumb
16

Permissive / Control Interlocks


What is the C-2 control interlock?

PR NIs > 103% [1/4]


Not on CP005 permissive lampbox.


Function:

Stops MANUAL AND AUTO outward rod motion

A image thumb
17

Permissive / Control Interlocks


What is the C-3 control interlock?

OT∆T < 1.5% of setpoint [2/4]


CP005 lampbox light lit when C-3 True.


Function:

Stops MANUAL AND AUTO outward rod motion

A image thumb
18

Permissive / Control Interlocks


What is the C-4 control interlock?

OP∆T < 1.5% of setpoint [2/4]


CP005 lampbox light lit when C-4 True.


Function:

Stops MANUAL AND AUTO outward rod motion

A image thumb
19

Permissive / Control Interlocks


What is the C-5 control interlock?

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


Not on CP005 permissive lampbox.


Function:

Stops AUTO outward rod motion

A image thumb
20

Permissive / Control Interlocks


What is the C-7 control interlock?

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

A image thumb
21

Permissive / Control Interlocks


What is the C-9 control interlock?

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

A image thumb
22

Permissive / Control Interlocks


What is the C-11 control interlock?

Control Bank D ≥ 248 steps


CP005 lampbox light lit when C-11 True.


Function:

Stops AUTO outward rod motion

A image thumb