Power Range Channel:

The outcome of each power range channel is directly proportional to reactor power and classically covers a range from 0 percent to 125 percent of full power, other than varies along with each reactor. The outcome of each channel is displayed on a meter in terms of power level in percent of full rated power. The increment of  each  instrument  is  adjustable  that  gives  a  means  for  calibrating  the  outcome. This adjustment is generally determined through using a plant heat balance.  Protective actions might be initiated through high power level on any two channels; this is termed coincidence operation.

Figure displays a typical power range channel.

Figure: Power Range Channel

Two detectors in every channel are functionally linked in parallel so in which the measured signal is the sum of the two detectors.  This outcome drives a linear amplifier that amplifies the signal to a meaningful level.

The reactor protective interface gives signals for protective actions.  Instances of protective action signals given through the power range involve:

1.  A signal to the reactor protection system at a selected value (generally 10 percent reactor power) to disable the high startup rate reactor trip

2.  A signal to protective systems which reactor power level exceeds predetermined values

3.  A signal for use in the reactor control system

4.  A signal to the power-to-flow circuit