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PDM 502™

Power Distribution Monitor

Power distribution monitor used with SPN detectors for in-core neutron flux distribution monitoring in the power range.

Tag Features

  • Up to six in-core SPND per DLK 250™ channel
  • Compatible with in-core SPND of various sensitivities and response times
  • High reliability of SPND for severe environmental conditions (temperature, pressure...)
  • Differential current amplifier for dynamic signal compensation
  • Signal filtering with adaptive time constant
  • Neutron flux signal for each detector
  • Digital calibration and offset compensation for each detector signal
  • Calculation of the mean value and generation of a substitute signal for a faulty detector
  • Linear analog outputs
  • Generation of analog and binary outputs for the reactor protection system
  • Built-in test signal generators (remote activation possible)
  • Option: integrated transmitter for fuel temperature monitoring
  • Option: fast isolated outputs for noise analysis


The power distribution monitor PDM 502 monitor forms part of the digital Neutron Flux Monitoring Systems (NFMS) proTK™ product line. It is used, in combination with Self Powered Neutron Detectors (SPND), for in-core neutron flux distribution monitoring in the power range.

The associated DLK 250 processing unit has been designed and is qualified (in hardware and software) to meet requirements applicable at the level of the reactor protection system.

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