Plant Monitoring System (RJ)

Question 1

What is the power supply of the Plant Monitoring System?

Answer 1

PMS UPS (NQ)
* 120 Vac Computer Distribution Panel (NQN-D01)
* DC source:
o** NKN-M45** through 120 Vac static inverter to static transfer switch.
* AC Sources (480/120V XFMR VR):
o Normal - NHN-M08
o Backup - NHN-M72 (B train – SIAS load shed)
o Manually transfer the 480V source to VR

• Static transfer switch normally aligned to DC source
• Auto transfers to AC source

Question 2

How is decay accounted for in the Incore instruments?

Answer 2

• PMS compensates incores for rhodium decay
• PMS compensates for background detector (cancels noise)

Question 3

How does the plant respond to a loss of the Plant Computer?

Answer 3

PC Failure:
* PC COLSS lost
* CEAs cannot move in AS or MS.
o Can be moved in MG or MI.
* Cannot determine alarms on PC (obtain at RK cabinets)

Question 4

How does the plant respond to a loss of the Plant Computer and the Core Monitoring Computer?

Answer 4

PC and CMC Failure (PMS):
* CEAs could not be moved in MS or AS.
o Able to be moved in Manual Group or Manual Individual.
* Cannot determine alarms on PC (obtain at RK cabinets)
* Loss of COLSS and PDIL Alarm Circuit.

Question 5

What do the following colors mean in the Plant Monitoring System:
Green on Black
White on Red
Black on Cyan
White on Magenta

Answer 5

Computer Points Display Info
* **Normal status: Green on Black **Background
* **Alarm: White on Red **Background
* Manually Inserted value: Black on Cyan Background
* Bad data: White on Magenta Background

Question 6

What are the NSSS programs run on the Plant Monitoring System?

Answer 6

NSSS programs
* In-core detector processing and tests
* CEA programs
* COLSS
* Xe reactivity balance program
* Post-Trip Review Program
* Sequence-of-Events Program (SOE)
* CECOR data collector