Trips

Question 1

• Reactor Trips & SI Initiations*
• • *

What is the coincidence of the manual Rx Trip?

Answer 1

1 of 2 switches

• Note:*
• Switches located on CP005 and CP007*

Question 2

• Reactor Trips & SI Initiations*
• • *

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

Answer 2

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*

Question 3

• Reactor Trips & SI Initiations*
• • *

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

Answer 3

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*

Question 4

• Reactor Trips & SI Initiations*
• • *

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

Answer 4

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*

Question 5

• Reactor Trips & SI Initiations*
• • *

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

Answer 5

109% [2/4]

Question 6

• Reactor Trips & SI Initiations*
• • *

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

Answer 6

5% RTP / 2 sec [2/4]

Question 7

• Reactor Trips & SI Initiations*
• • *

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

Answer 7

• *114% RTP [2/4]**
• (± Penalties)*

Question 8

• Reactor Trips & SI Initiations*
• • *

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

Answer 8

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*

Question 9

• Reactor Trips & SI Initiations*
• • *

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

Answer 9

• 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*

Question 10

• Reactor Trips & SI Initiations*
• • *

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

Answer 10

• *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*

Question 11

• Reactor Trips & SI Initiations*
• • *

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

Answer 11

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*

Question 12

• Reactor Trips & SI Initiations*
• • *

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

Answer 12

• *108% RTP [2/4]**
• (- Penalties)*

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

Question 13

• Reactor Trips & SI Initiations*
• • *

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

Answer 13

2380 psig [2/4]

Question 14

• Reactor Trips & SI Initiations*
• • *

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

Answer 14

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*

Question 15

• Reactor Trips & SI Initiations*
• • *

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

Answer 15

20% [2/4 on 1/4]

Question 16

• Reactor Trips & SI Initiations*
• • *

What will cause a SI Initiation?

Answer 16

• ≥ 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

Question 17

• Reactor Trips & SI Initiations*
• • *

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

Answer 17

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.*

Question 18

• Reactor Trips & SI Initiations*
• • *

What will cause an actuation train urgent alarm Rx trip?

Answer 18

Loss of AC power to safeguards actuation train

Actuation train in test

Safeguards test cabinet in test

Coincidence required is [2/3].

Question 19

• Reactor Trips & SI Initiations*
• • *

What are the SSPS Rx trips?

Answer 19

• *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

Question 20

• Reactor Trips & SI Initiations*
• • *

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

Answer 20

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*

Question 21

• Reactor Trips & SI Initiations*
• • *

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

Answer 21

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*

Question 22

• Reactor Trips & SI Initiations*
• • *

What will cause a logic cabinet urgent alarm Rx trip?

Answer 22

• *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.*