PPS: Plant Protection System Flashcards Preview

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Flashcards in PPS: Plant Protection System Deck (80)
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1

What is the PPS setpoint for the VOPT? What happens when this setpoint is reached?

110% Max
9.7% > steady state power (Band Function)
10.6%/min rate of change

Actuation: Reactor Trip

2

What is the PPS setpoint for the High Log Power?What happens when this setpoint is reached?

> .01% power
- used while shutdown

Actuation: Reactor Trip

3

What is the PPS setpoint for the High Local Power Density (LPD) Trip? What happens when this setpoint is reached?

> 21 kw/ft

Actuation: Reactor Trip

4

What is the PPS setpoint for the Low DNBR Trip? What happens when this setpoint is reached?

< 1.34

Actuation: Reactor Trip

5

What is the PPS setpoint for the High Pressurizer Pressure Trip? What happens when this setpoint is reached?

> 2383 psia

Actuation: Reactor Trip

6

What is the PPS setpoint for the Low Pressurizer Pressure Trip? What happens when this setpoint is reached?

< 1837 psia (variable)

Actuation: Reactor Trip, SIAS, CIAS

7

What is the PPS setpoint for the Low SG Pressure Trip? What happens when this setpoint is reached?

< 960 psia (variable)

Actuation: Reactor Trip, MSIS

SG lockout at > 185 psid

8

What is the PPS setpoint for the Low SGWL Trip? Any other actuations with setpoints?

< 44.3 % - Reactor Trip
< 25.8 % - AFAS
< 20.3 % - DAFAS

9

What is the PPS setpoint for the High SGWL Trip?

> 91%

Actuation: Reactor Trip, MSIS

10

What is the PPS setpoint for the High Containment Pressure Trip? What happens when this setpoint is reached?

> 3 psig

Actuation: Reactor Trip, MSIS, CIAS, SIAS

11

What is the PPS setpoint for the High-High Containment Pressure Trip? What happens when this setpoint is reached?

> 8.5 psig

Actuation: CSAS

12

What is the PPS setpoint for the Low Reactor Coolant Flow Trip? What happens when this setpoint is reached?

Variable

Actuation: Reactor Trip

13

What is the PPS setpoint for the Low Refueling Water Tank Level? What happens when this setpoint is reached?

< 9.4%

Actuation: RAS

14

What is the basis for the VOPT?

Protects the reactor core during positive reactivity addition excursion (Uncontrolled CEA Withdrawal, CEA Ejection)

15

What is the basis for the High Log Power Trip?

Protects the integrity of the fuel cladding and helps protect the Reactor Coolant Pressure Boundary in the event of an unplanned criticality from a shutdown condition.

16

What is the basis for the High Pressurizer Pressure Trip?

Protects against the possibility of exceeding the RCS pressure safety limit during these postulated events:
- Loss of Vacuum
- CEA Withdrawal from Low Power Conditions
- CVCS Malfunction
- Main Feedwater Line Break

17

What is the basis for the Low Pressurizer Pressure Trip?

This is designed to trip the reactor to assist the ESF System in the event of a LOCA.

18

What is the basis for the High Containment Pressure Trip?

Prevents exceeding the containment design pressure during design basis LOCA or MSLB.

19

What is the basis for the Low Steam Generator Pressure Trip?

Provides protection against an excessive rate of heat extraction from the SGs and resulting rapid, uncontrolled cooldown of the RCS. This trip is needed to trip the reactor in the event of a MSLB or MFLB.

20

What is the basis for the Low Steam Generator Level Trip?

Ensures that the reactor is tripped to ensure the design pressure of the RCS is not exceeded during these events:
- Inadvertent opening of an ADV
- Loss of Vacuum
- Loss of Feed
- MFLB
- Single RCP Rotor Seizure

21

What is the basis for the High Steam Generator Level Trip?

Provided to protect the turbine from moisture carryover in case of a steam generator overfill event.

22

What is the basis for the Low Reactor Coolant Flow Trip?

Provides protection against a RCP Sheared Shaft Event

23

What is the basis for the High Local Power Density Trip?

Provides protection against fuel centerline melting due to the occurrence of excessive LDP peaks during the following events (things that add positive reactivity):
- Decrease in Feedwater Temperature
- Increase in Feedwater Flow
- Increase in SD (not MSLR) with no Turbine Trip
- Uncontrolled CEA withdrawal at low power
- Uncontrolled CEA withdrawal at power
- CEA misoperation (excluding a dropped 4 finger CEA)

24

What is the basis for the Low DNBR Trip?

Provides protection against core damage due to the occurrence of locally saturated conditions in the hot channel during [events that add positive reactivity] and is the primary reactor trip.

25

What PPS trips come from NI inputs?

VOPT
Hi Log Power
DNBR
LPD

26

What components make up PPS?

RPS
ESFAS
SPS
DAFAS

27

What two major PPS trips are input directly from CPCs?

Low DNBR
High LPD

28

What PPS trips are receive their inputs from NI's?

VOPT
Low DNBR
High Log Power
High LPD

29

What happens to the PPS if a single power supply to a Logic Matrix is lost?

2 RTCBs Open

30

What happens to the PPS if a single power supply to a Logic Matrix is lost with a trip in on the opposite channel?

2 RTCBs open
- even though one of the logic matrix power supplies is gone, the contacts for the individual trips that lost power remain closed, creating a path for the remaining power supply to provide power its associated relays, keeping those relays energized which keeps its RTCBs closed.