null
US
Sign In
Sign Up for Free
Sign Up
We have detected that Javascript is not enabled in your browser. The dynamic nature of our site means that Javascript must be enabled to function properly. Please read our
terms and conditions
for more information.
Next up
Copy and Edit
You need to log in to complete this action!
Register for Free
6387487
P-Signals
Description
Westinghouse Permissive Signals
No tags specified
ps & cs
ilot
sro
nuclear operations
ps & cs / rx trips
sro
Mind Map by
Lauren Neuburger
, updated more than 1 year ago
More
Less
Created by
Lauren Neuburger
almost 8 years ago
17
0
0
Resource summary
P-Signals
P-4: Reactor Trip
Purpose: Protection Grade Signal
Setpoint: Reactor Trip Breakers Open
Coincidence: Train associated trip breaker and bypass breaker open or not connected.
Notes: Performs the following:
Activates Main Turbine Trip
Will generate FW Isolation signal if Tave below low Tave setpoint of 564 deg F (processed by SSPS)
Blocks auto re-actuation of SI after manually resetting SI (processed by SSPS)
Seals in FW Isolation signal due to SI or HI-HI S/G level (P-14) (processed by SSPS)
Arms Steam Dumps to allow operation in Tave mode from Plant Trip Controller
P-6: SR Rx Trip Block
Setpoint: > 10E-10 amps
Coincidence: 1/2 IR
Notes:
Allows manual block of SR Hi Flux Trip (2/2 block switches)
Block switches also de-energize SR Hi Volts
When <10E-10 amps on 2/2 channels then:
SR Hi Volts re-energized
SR trip and Flux doubling protection re-instated (occurs automatically)
P-7: At Power
Setpoint: None
Coincidence: P-10 or P-13 met
Notes: The following Rx Trips are re-instated with P-7 met (blocked when not met):
PZR Lo Pressure
PZR Hi Level
RCP Undervoltage
RCP Underfrequency
Low Flow in 2 RCS Loops
P-8: 3 Loop Flow
Setpoint: > 48%
Coincidence: 2/4 PR Channels
Notes: Allows Rx trip when low flow condition is sensed
On 2/3 channels for 1 RCS loop
Auto blocked when 2/4 channels < 48%
P-9: Turbine Trip
Setpoint: > 50%
Coincidence: 2/4 PR Channels
Notes: When met, generates RX Trip if Turbine Trip occurs
Auto blocked when < 50% on 3/4 PR channels
P-10: Nuclear At Power
Setpoint: > 10%
Coincidence: 2/4 PR Channels
Notes: When met, it performs the following:
Feeds P-7
Auto blocks SR Trip and de-energizes SR Hi Volts
Allows blocking of IR Trip and C-1
Allows blocking of PR Trip (Low setpoint)
SR Hi Flux at S/D annunciator and CTMT Evacuation alarm defeated
Notes: When 3/4 PR channels < 10% the following are auto re-instated:
IR Trip
C-1
PR Trip (Low setpoint)
Removes permissive to P-7
P-11: PZR SI Block
Setpoint: < 1960 psig
Coincidence: 2/3 PZR Pressure Channels
Notes: When met allows manual blocking of:
Low PZR Pressure SI
Low Steamline Pressure SI, once blocked the Neg Steam Line P Hi Rate is armed
Notes: Once PZR P > 1960 psig on 2/3 channels then:
Low PZR SI blocked, Open signal to SI Accum Isol Valves
Low Steamline P armed, Neg SL P Hi Rate blocked, Open signal to SI Accum Isol Valves
P-12: Lo-Lo Tave
Setpoint: 553 deg F
Coincidence: 2/4 Channels
Notes: When met:
Auto closes all steam dump valves
3 Cooldown steam dump valves may be opened by bypass switch
P-13: Turbine At Power
Setpoint: Turbine PWR > 10% RTP
Coincidence: 1/2 Turbine Impulse P Channels
Notes: When met:
Feeds P-7
Auto removes signal to P-7 when no longer met
P-14: S/G Hi-Hi Level
Purpose: Protection
Setpoint: 84% (U1) / 81.5% (U2)
Coincidence: 2/3 detectors on any 1 S/G
Notes: When met performs the following:
Trips MFPs
Trips Main Turbine
Generates Main FW Isolation signal
Show full summary
Hide full summary
Want to create your own
Mind Maps
for
free
with GoConqr?
Learn more
.
Similar
TRM Important
Lauren Neuburger
Systems 2 - Electrical
Lauren Neuburger
Systems 3 - Secondary
Lauren Neuburger
Systems 4 - Turbine
Lauren Neuburger
The Skeletal System - PE GCSE EdExcel
naomisargent
Of Mice and Men
amyk4321
Maths
Emmet McDonald
Psychology Exam review
emaw757
PSBD TEST # 3
Suleman Shah
The Lymphatic System
james liew
ALL module 5 vocab
Pamela Dentler
Browse Library