ERFDADS

Question 1

What do the following colors mean on ERFDADS:
Green
Magenta
White
Orange
Yellow
Red
Cyan

Answer 1

Data is displayed in the P&ID screens using the following format:
* Green Good value
* Magenta Bad value (loss of data link, out of range)
* White Suspect data (failed a data validity check)
* Orange Exceeded a rate of change setpoint
* Yellow Exceeded a high or low setpoint (level 2)
* Red Exceeded a high-high or low-low setpoint (level 1)
* Cyan Data manually inputted

Question 2

How will a constant leak rate display on ERFDADS?

Answer 2

Conclusion
Assuming that SPDS1737 (linear regression time) is set for 450 seconds, a constant leak rate will
display as follows during the first 7.5 minutes on SPDS5047:
* Actual leak rate will exceed indicated leak rate.
* The slope of indicated leak rate vs. time on SPDS5047 trend will be almost constant (leak
rate trend resembles a straight line).
* 7.5 minutes later, indicated leak rate will level out.

Question 3

How will a degrading leak rate display on ERFDADS?

Answer 3

A degrading leak rate will display as follows on SPDS5047:
* Actual leak rate will exceed indicated leak rate.
* If the leak stabilizes and then indicated leak rate will level out 7.5 minutes after stabilization.
* The slope of indicated leak rate vs. time on SPDS5047 trend will be constantly increasing
(leak rate trend resembles an exponential).

Question 4

How long does the on-shift STA have to activate Emergency Response Data Systems (ERDS)?

What level of classificaiton requires ERDS activation?

Answer 4

It is activated within 1 hour after declaring an Alert or higher Emergency classification.

Question 5

Following a Reactor Trip, how long will ERFDADS alarms be silenced?

Answer 5

Following a Reactor trip, all alarms will be disabled for 2 minutes. After this time, any points still in an alarm condition will begin to alarm and will require silencing.