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Systems > P & C Signals, Trips & SI's > Flashcards

P & C Signals, Trips & SI's Flashcards

1
Q

P-4

coincidence

inputs

A

Rx trip and associated bypass breaker open

RTA + BYA (P-4a) 2/2 per train

RTB + BYB (P-4b) 2/2 per train

  • trips turbine
  • closes FRV & bypass w/ Tave < 554 F
  • seal in SI reset
  • steam dumps to Rx trip mode (B)
  • blocks stm dumps 3/4, arms 1/2 (A)
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2
Q

P-6

coincidence

inputs

A

IR permissive > 10-10 ica

1/2

  • permits manual blocking of SR trip (105 cps)
  • allows de-energizing of SR Ni’s

(provides one decade of overlap between SR and IR)

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3
Q

P-7

coincidence

inputs

A

P-10 met ( > 10% PR)

or

P-13 met ( >10% Pimp)

1/2

enables trips:

  • Pzr low pressure
  • Pzr high level
  • RCP bkr open
  • RCP bus UF or UV
  • RCS loop low flow

(should not operate above 10% w/ these conditions)

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4
Q

P-8

coincidence

inputs

A

PR > 35%

2/4

Changes loss flow Trip 2/4 loops -> 1/4 loops

DNB protection

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5
Q

P-9

coincidence

inputs

A

PR > 50%

2/4

Activates Rx Trip on every turbine Trip > 50%

protects against major LR

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6
Q

P-10

coincidence

inputs

A

PR > 10%

2/4

Allows blocking:

  • PR flux Trip (low) 25%
  • IR flux Trip (hi) 25% equivalent
  • IR Rod stop 20% (C-1)

Blocks:

  • Subcooling monitor alarm

Inputs:

  • P-7 (low power permissive)
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7
Q

P-11

coincidence

inputs

A

Pzr Press >/= 1915 psig

2/3

below:

  • allows blocking of Low Ppzr SI
  • allows blocking of Low Pstmln SI and SLI
  • allows enabling of Hi rate SLI

above:

  • enables Low PPzr SI
  • enables Low Pstmln SI and SLI
  • disables Hi rate SLI
  • sends open signal to Accum isolation valves
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8
Q

P-12

coincidence

inputs

A

Tave < 543 F

2/4

Blocks all steam dump valves

(protects against uncontrolled cooldown)

(Group 1 is bypassable)

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9
Q

P-13

coincidence

inputs

A

Pimp > 10% (turbine power equivalent)

1/2

Provides input to P-7

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10
Q

P-14

coincidence

inputs

A

L S/G > 90% NR

2/3 sensors 1/4 S/G

  • trips Main turbine
  • trips FWP turbines
  • closes FWI valves
  • closes FW control and bypass valves
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11
Q

C-1

coincidence

inputs

A

IR rod stop > 20% (current equiv)

1/2

stops outward rod motion (auto and manual)

can be blocked at P-10

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12
Q

C-2

coincidence

inputs

A

PR Rod stop @ 103%

1/4

Blocks Auto & Manual outward Rod motion

Can be bypassed for testing or failed channel

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13
Q

C-3

coincidnence

inputs

A

OTAT Rod stop and runback

1% below trip setpoint

2/4

blocks auto and manual rod withdrawl

runback = 10% / min

(2400 MW/ min for 1.5 sec…..wait 28.5 sec)

(target is 203 MW, runback clears when cond clears)

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14
Q

C-4

coincidnence

inputs

A

OPAT Rod stop and runback

1% below trip setpoint

2/4

blocks auto and manual rod withdrawl

runback = 10% / min

(2400 MW/ min for 1.5 sec…..wait 28.5 sec)

(target is 203 MW, runback clears when cond clears)

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15
Q

C-5

coincidnence

inputs

A

Turbine low power < 15 % Pimp (PT-505)

1/1

Stops auto outward rod motion

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16
Q

C-7A

coincidnence

inputs

A

10% loss of load/ 140 sec

Pimp (PT-505a, 506a, PT-8)(MSS)

arms group 1 and 2 steam dumps (40%’s)

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17
Q

C-7B

coincidnence

inputs

A

50% loss of load / 140 sec

Pimp (PT-505a, 506a, PT-8)(MSS)

arms group 3 and 4 steam dumps (35%’s and 10%’s)

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18
Q

C-9

coincidnence

inputs

A

condensor available

Vacuum > 20” Hg + CWP running (bkr closed)

2/2 (Pcond) + bkr

permissive for steam dump groups 1 and 2 (40%’s)

19
Q

C-11

coincidnence

inputs

A

Control Bank D Rod stop

CB D > 220 steps

stops automatic outward rod motion

20
Q

C-20

coincidnence

inputs

A

PT-505/ 506 > 40% Core thermal power (equiv.)

2/2

Arms AMSAC

21
Q

SR hi flux trip

coincidence

interlock

purpose

A

> 105 cps

1/2

blockable > P-6, when blocked SR de-energizes

S/U rod withdrawl accident

22
Q

IR hi flux trip

coincidence

interlock

purpose

A

> 25% (current equiv)

1/2

blockable > P-10

S/U rod withdrawl accident

23
Q

PR hi flux Trip (low)

coincidence

purpose

interlock

A

PR > 25%, trips Rx

2/4

Startup accident

Can be blocked > P-10 (2/2 switches)

24
Q

PR hi flux Trip (hi)

coincidence

interlock

purpose

A

PR > 109%

2/4

Unblockable

Overpower (kw/ft), positive reactivity excursion

25
Q

Hi flux rate Trip

coincidence

interlock

purpose

A

PR >/= +5% / 2 sec

2/4

seals in, must be reset @ Ni cabinet

ejected rod

26
Q

OT delta T trip

coincidence

interlock

purpose

A

> 120% +/- penalties (bonus/penalties)

2/4

none

DNBR > 1.17

27
Q

OP delta T trip

coincidence

parameter change setpoint

purpose

A

> 107.2% - penalties

2/4

Tave

kw/ ft

28
Q

Loop low flow trip

coincidence

interlock

purpose

A

< 90%

2/3 sensors 1/4 loops (> P-8)

2/3 sensors 2/4 loops (< P-8)

< P-7 trip deactivated (10%)

P-8 changes coincidence (35%)

DNBR > 1.17

(< P-8, 1 low flow and 1 bkr open will initiate Rx trip)

29
Q

RCP Bkr open trip

coincidence

interlock

purpose

A

bkr open

2/4

trip deactivated < P-7 (10%)

DNBR > 1.17

(< P-8, 1 low flow and 1 bkr open will initiate Rx trip)

30
Q

RCP Bus UV trip

coincidence

interlock

purpose

A

8050 volts

1/2 sensors, 2/2 Buses (12kv D, E)

trip deactivated < P-7 (10%)

DNBR >1.17

31
Q

RCP Bus UF

coincidence

interlock

purpose

A

54 Hz

2/3 sensors, 1/2 busses (12kv D, E)

trip deactivated < P-7 (10%), also trips RCP’s

DNBR > 1.17

32
Q

Low Pressure Trip

Coincidence

interlock

purpose

A

Ppzr < 1950 psig (rate sensitive)

2/4

trip deactivated < P-7 (10%)

DNBR limit

33
Q

High Pressure trip

coincidence

interlock

purpose

A

Ppzr > 2385 psig

2/4

none

RCS integrity

34
Q

Hi Lpzr Rx trip

coincidence

interlock

purpose

A

Lpzr > 90%

2/3

trip deactivated < P-7 (10%)

B/U to Hi Ppzr/ prevent water out safties/ RCS integrity

35
Q

L S/G low-low

coincidence

interlock

purpose

A

L S/G < 15%

2/3 sensors, 1/4 loops

delay time to trip: (Pwr < 50%, varies with delta T)

0% time delay ~ 500 sec

50% time delay ~ 30 sec

loss of heat sink

36
Q

Turbine trip - Rx trip

coincidence

interlock

purpose

A

Low PAST < 50psig OR SV closed

AST 2/3 OR SV 4/4

trip deactivated < P-9 (50%)

limit temp/ Press transients in RCS

37
Q

Manual Rx trip

coincidence

interlock

purpose

A

switch

1/2

none

operator judgement

38
Q

SI Rx trip

coincidence

interlock

purpose

A

SI

any “S” signal

none

limits consequence of accident

39
Q

Seismic Rx trip

coincidence

interlock

purpose

A

0.30 g

2/3 sensors in same direction (x, y, z)

none

Seismic B/U trip

40
Q

SSPS General Warning Rx trip

coincidence

interlock

purpose

A

Train A & B SSPS simultanious GW

2/2 (1 train A + 1 train B)

none

Trip Rx if failure of protection system

41
Q

Manual SI

coincidence

interlock

purpose

A

switch

1/2

none

operator judgement

42
Q

CNMT Hi Press SI

coincidence

interlock

purpose

A

PCNMT > 3 psig

2/3

none

Hi energy line break inside CNMT

43
Q

Low Ppzr SI

coincidence

interlock

purpose

A

Ppzr < 1850 psig

2/4

blockable < P-11 (auto unblock > P-11, (1915 psig))

LOCA

44
Q

Low Pstm line SI

coincidence

interlock

purpose

A

Pstm line < 600 psig (lead-lag)

2/3 sensors, 1/4 loops

also actuates SLI, blockable < P-11 (1915 psig), when blocked actuates hi rate SLI

Steam line break

Systems (89 decks)

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