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Flashcards in Reactor Trips & SI Initiations Deck (22):
1

Reactor Trips & SI Initiations


What is the coincidence of the manual Rx Trip?

1 of 2 switches


Note:
Switches located on CP005 and CP007

2

Reactor Trips & SI Initiations


What is the setpoint of the SR Flux - High Rx Trip?

1x105 cps [1/2]


Manual Block: ≥ P-6 (1x10-10 amps) [1/2]

Auto Block: ≥ P-10 (10%) [2/4]

Auto Unblock: < P-6 (1x10-10 amps) [2/2]


Note:
P-10 driven off PR NIs and NOT RTP

3

Reactor Trips & SI Initiations


What is the setpoint of the IR Flux - High Rx Trip?

25% [1/2]
(IR amps equivalent)


Manual Block: ≥ P-10 (10% PR NIs) [2/4]

Auto Unblock: < P-10 (10% PR NIs) [3/4]


Note:
P-10 driven off PR NIs and NOT RTP

4

Reactor Trips & SI Initiations


What is the setpoint of the PR Flux High - Low Rx Trip?

25% [2/4]


Manual Block: ≥ P-10 (10%) [2/4]

Auto Unblock: < P-10 (10%) [3/4]


Note:
P-10 driven off PR NIs and NOT RTP

5

Reactor Trips & SI Initiations


What is the setpoint of the PR Flux High - High Rx Trip?

109% [2/4]

6

Reactor Trips & SI Initiations


What is the setpoint of the PR Flux Rate - High Rx Trip?

5% RTP / 2 sec [2/4]

7

Reactor Trips & SI Initiations


What is the setpoint of the OT∆T Rx Trip?

114% RTP [2/4]
(± Penalties)

8

Reactor Trips & SI Initiations


What is the setpoint of the PZR Pressure - Low Rx Trip?

1870 psig [2/4]


Auto Blocked: < P-7
(< P-10 (10%) [3/4] AND < P-13 (10% Impulse Pressure) [2/2])

Auto Unblocked: ≥ P-7
(≥ P-10 (10%) [2/4] OR ≥ P-13 (10% Impulse Pressure) [1/2])


Note:
P-10 driven off PR NIs and NOT RTP

9

Reactor Trips & SI Initiations


What is the setpoint of the RCS Flow - Low Rx Trip?

Setpoint:
91.8%

Coincidence:
< P-8: [2/3 on 2/4]
(< 40% PR NIs) [3/4]
≥ P-8: [2/3 on 1/4]
(≥ 40% PR NIs) [2/4]


Auto Blocked: < P-7
(< P-10 (10%) [3/4] AND < P-13 (10% Impulse Pressure) [2/2])

Auto Unblocked: ≥ P-7
(≥ P-10 (10%) [2/4] OR ≥ P-13 (10% Impulse Pressure) [1/2])


Note:
P-10 driven off PR NIs and NOT RTP

10

Reactor Trips & SI Initiations


What is the setpoint of the RCP UV (15 kV cubicle) Rx Trip?

72.6% for 1.5 sec [2/4]
(10,014 VAC)


Auto Blocked: < P-7
(< P-10 (10%) [3/4] AND < P-13 (10% Impulse Pressure) [2/2])

Auto Unblocked: ≥ P-7
(≥ P-10 (10%) [2/4] OR ≥ P-13 (10% Impulse Pressure) [1/2])


Note:
P-10 driven off PR NIs and NOT RTP

11

Reactor Trips & SI Initiations


What is the setpoint of the RCP 15 kV cubicle UF Rx Trip?

57.2 Hz [2/4]


Will also trip ALL RCPs (DNB Protection)


Auto Blocked: < P-7
(< P-10 (10%) [3/4] AND < P-13 (10% Impulse Pressure) [2/2])

Auto Unblocked: ≥ P-7
(≥ P-10 (10%) [2/4] OR ≥ P-13 (10% Impulse Pressure) [1/2])


Note:
P-10 driven off PR NIs and NOT RTP

12

Reactor Trips & SI Initiations


What is the setpoint of the OP∆T Rx Trip?

108% RTP [2/4]
(- Penalties)


Note:
Unlike OT∆T which has ± Penalties, OP∆T only has - Penalties.

13

Reactor Trips & SI Initiations


What is the setpoint of the PZR Pressure - High Rx Trip?

2380 psig [2/4]

14

Reactor Trips & SI Initiations


What is the setpoint of the PZR Level - High Rx Trip?

92% [2/4]


Auto Blocked: < P-7
(< P-10 (10%) [3/4] AND < P-13 (10% Impulse Pressure) [2/2])

Auto Unblocked: ≥ P-7
(≥ P-10 (10%) [2/4] OR ≥ P-13 (10% Impulse Pressure) [1/2])


Note:
P-10 driven off PR NIs and NOT RTP

15

Reactor Trips & SI Initiations


What is the setpoint of the S/G Level - Low 2 Rx Trip?

20% [2/4 on 1/4]

16

Reactor Trips & SI Initiations


What will cause a SI Initiation?

≥ P-11:
PZR Pressure - Low [2/4]
1857 psig
Steam Pressure - Low [2/3 on 1/4]
735 psig

No Permissives:
Containment Pressure - High [2/3]
3.0 psig
Manual [1/2]


Manual Blocked: < P-11: PZR Pressure < 1985 psig [2/3]

Auto Unblocked: ≥ P-11: PZR Pressure ≥ 1985 psig [2/3]


Note:

  • P-11 Block switches located on CP005
  • SI Manual Switches are located on CP001 and CP005

17

Reactor Trips & SI Initiations


What is the setpoint of the PZR Pressure - Low SI Initiation Signal?

1857 psig [2/4]


Manual Blocked: < P-11: PZR Pressure < 1985 psig [2/3]

Auto Unblocked: ≥ P-11: PZR Pressure ≥ 1985 psig [2/3]


Note:
Block switches located on CP005

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18

Reactor Trips & SI Initiations


What is the setpoint of the Steam Pressure - Low SI Initiation Signal?

735 psig [2/3 on 1/4]


Manual Blocked: < P-11: PZR Pressure < 1985 psig [2/3]

Auto Unblocked: ≥ P-11: PZR Pressure ≥ 1985 psig [2/3]


Note:
Block switches located on CP005

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20

Reactor Trips & SI Initiations


What will cause a logic cabinet urgent alarm Rx trip?

Loose / removed circuit card
(any except isolation boards)

Respective actuation train urgent alarm
Actuation Cabinet "A" → Logic Cabinet "R"
Actuation Cabinet "B" → Logic Cabinet "S"

Associated bypass breaker closed AND Racked-In

Input Error Inhibit Sw. in "Inhibit"

Switches NOT in "OFF"
Logic Test Sw. 'A'
Permissive Test Sw.
Memory Test Sw.


Coincidence required is [2/2].


Note:
Do not confuse input error inhibit sw. with multiplexer test sw. Both have an inhibit position.

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22

Reactor Trips & SI Initiations


What is the setpoint of the Containment Pressure - High SI Initiation Signal?

3.0 psig [2/3]


Note:
Unlike PZR Pressure - Low and Steam Pressure - Low which can be blocked on P-11, Containment Pressure - High is active at all times.

24

Reactor Trips & SI Initiations


What will cause an actuation train urgent alarm Rx trip?

Loss of AC power to safeguards actuation train

Actuation train in test

Safeguards test cabinet in test


Coincidence required is [2/3].

25

Reactor Trips & SI Initiations


What are the SSPS Rx trips?

Logic Cabinet Urgent Alarm [2/2]
Actuation Cabinet "A" → Logic Cabinet "R"
Actuation Cabinet "B" → Logic Cabinet "S"

Actuation Train Urgent Alarm [2/3]

Master Relay Defeat Sw.

Loss of both 15 VDC OR both 48 VDC in a logic train