Reactor Control Room Electrical Dist Flashcards
TRA00033
What are the purposes of the loop and capsule DCSs?
Monitor, control and protect loops and capsules.
Why are the critical digital functions distributed?
Elimination of single failure points.
What DCSs are part of LOCS DCS?
Loop DCS, Capsule DCS
What is in Safe 1?
Engineering workstation, 6 operator workstations, security network switch, 2 DPU network switches
What are the power supplies to the two ATS in Safe 2?
670-E-455 and 670-E-50
What do loops DCS network switches convert?
Digital electrical signal to a digital optical signal and back.
What components can be found in a loop RPU?
Redundant PSs, DPU pair, I/O Modules, 2 redundant network switches
What is the secondary power supply to all loop DCS RPUs?
670-E-85 LOCS UPS
What are the two types of backplanes?
Hardware and software
Which workstations receive local alarm information immediately from 1D-N primary DPU?
All loop DCS workstations
How can process control be transferred between primary and secondary DPUs?
Automatic (failover) or manual (takeover)
What is the purpose of the reset button on a DPU?
Causes DPU to stop controlling and reset
Backup network switch is blinking yellow on a DPU. What does that mean?
Comms not established to backup DPU
CP LED is blinking yellow/green on a DPU. What does that mean?
Healthy heartbeat
The State LED is solid red on a DPU. What does that mean?
Offline or fatal error.
How is the plant clock connected to loop DCS?
Via 1C-W DPUs only
What passes through loop DCS I/O modules?
All loop data signals and control drive signals.
How do I/O modules fail?
To last known value.
What are the 4 types of I/O modules?
AIs, AOs, DIs, and DOs.
Where are the security servers located?
Safe 2
What loop DCS component compares a setpoint with the current value and determines if an error exists?
The DPU
Draw basic loop DCS diagram.
What types of OS does maxVUE run on?
Microsoft Windows
What is required to raise the security level on DCS?
Password
What kind of problems are related to Priority 5 alarms?
DCS problems
What is the priority of TC alarms?
3
What kind of alarms are Priority 4 alarms?
SAR required instrument
What does forced mode do on a point control?
Forces DCS to see the point as reading a specific number.
What are parameter controllers also called?
Equipment control panels (ECPs)
What symbol indicates manual mode is on for a controller?
Hand symbol.
How can an operator determine if FCV-10 opened?
Change in the IX Fin
What alarm does disabling the SCRAM STATUS button cause?
Loss of Control Power in RCR
What causes UVRs to open?
Low pump voltage
Where are the UVR keyswitches?
SIU cabinets
What are the non-scram power reductions?
Reverse and slow setback.
What is required for a loop to cause a slow setback?
At least one Log-N recorder to be above 3NL, ‘W’ switch in the loop on position in the RCR, Slow Setback relays R3 or R3A to be energized.
Where are the power reduction settings listed?
EOIL
Where are the R3 and R3A relays located?
Back of the SIU
What is the purpose of the ‘W’ switch?
Connects the loop with the X-Y bus
Why are slow setbacks usually on TCs 1-4?
They are processed faster through temp transmitters in the SIU cabinet.
What is the primary power supply for RPU-3?
1C-E-84
What does a # indicate in an EARM?
Immediate actions.
What can cause a loss of capability for all loop scrams except UVRs?
Loss of loop DPUs.
