Setpoints

Question 1

Variable Over Power

Answer 1

Instrument: Safety Channel NIs

Set points:
Fixed Setpoint at 110% power.
Rate of change at 10.6% per minute
Variable setpoint at 9.7% above steady-state power.

Actuation: Reactor Trip

Question 2

High Log Power

Answer 2

Instrument: Log signal from middle detector of each Safety Channel NI

Set point:
>.01% Power…
(Bypassed on power increase)

Actuation: Reactor Trip
(Note: In order to BYPASS TRIP power has to be >1 E-4% and bypass is RE-MOVED <1 E-4%.)

Question 3

High Local Power Density (LPD)

Answer 3

Instrument: Originating in CPCs

Setpoint: >21 kw/ft.

Actuation: Reactor Trip

Question 4

Loss DNBR

Answer 4

Instrument: Originating in CPCs

Set point: <1.34

Actuation: Reactor Trip

(Note: 1.0 is when DNBR is happening)

Question 5

High Pressurizer Pressure

Answer 5

Instrument: PT-101A-D (NARROW Range PZR Pressure)

Set point: >2383 PSIA

Actuation: Reactor Trip

Question 6

Low Pressurizer Pressure

Answer 6

Instrument: PT-102 A-D (WIDE range PZR pressure)

Set point: <1837 psia (Variable)

Actuation: Reactor Trip, SIAS, CIAS

Question 7

Low Steam Generator Pressure

Answer 7

Instrument:
PT-1013 A-D (SG-1)
PT-1023 A-D (SG-2)

Set Point: Actuation:
<960 psia (Variable) Reactor Trip, MSIS
SG-1 and SG-2 (Difference >185psi) AFAS Lockout to SG w/lowest pressure

Question 8

Low Steam Generator Water Level

Answer 8

Instrument:
LT-1113 A-D (SG-1)
LT-1123 A-D (SG-2)
(Wide Ranges)

Set point: Actuation:
<44.3% Reactor Trip
<25.8% AFAS Initiation

Question 9

High Steam Generator Water Level

Answer 9

Instrument:
LT-1114 A-D (SG-1)
LT-1124 A-D (SG-2)
(Narrow Ranges)

Set point: >91%

Actuation: Reactor Trip, MSIS

Question 10

High Containment Pressure

Answer 10

Instrument: PT-351 A-D (Narrow Ranges)

Set point: >3 psig

Actuation: Reactor Trip, SIAS, CIAS, MSIS

Question 11

High-High Containment Pressure

Answer 11

Instrument: PT-352 A-D (Wide Range)

Set point: >8.5 psig

Actuation: CSAS

Question 12

Low Reactor Coolant Flow (SG D/P)

Answer 12

Instrument:
PD-115 A-D (SG-1)
PD-125 A-D (SG-2)

Set point: Variable

Actuation: Reactor Trip

Question 13

Low RWT Level

Answer 13

Instrument: LT-203 A-D

Set point: <9.4%

Actuation: RAS

Question 14

LO SG Level (DAFAS)

Answer 14

Instrument:
LT-1113 A-D (SG-1)
LT-1123 A-D (SG-2)
(Wide Ranges)

Set point: <20.3% (Needs SPS (Supplementary Protection System) > 2409 PSIA, NO AFAS, and NO MSIS)

Actuation: DAFAS Initiation input