Sensing elements at primary circuits of pressurized water reactors Part 1

The accuracy and reliability of the information received by the operation control systems of nuclear power plants depends on the adaptation of the technology to measuring sys--tem, respectively on the sensing elements beside the signal transmission and data processing. There is dealt with the points of view of choosing the sensing elements of pressurized water nuclear power plants, the requirements raised to these (considering the IAEA specifications), the description and use of the following sensor types set outside the active zone: integrating ionization chambers having gamma-compensation, too; electron impulse ionization chambers; BF3 proportional chambers. The investigations are accomplished on the primary circuit containing the reactor, grouping the measured parameters according to their physical properties, because its units seem to show the greatest deviation from those of the same destinations at the conventional heat power plants according to the technology and measuring engineering. (K.A.)