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PRM 501™

Power Range Monitor

Power range monitor used with neutron ionization chamber for ex-core neutron flux monitoring.

Tag Features

  • Qualified to perform category A functions, according to IEC 61226 and KTA 3505 (for safety related instrumentation)
  • Seismic qualification (IEEE 344 and KTA 3505)
  • Two signal paths for two neutron ionization chambers
  • Short response time < 20 ms
  • Calibration to neutron flux signal or reactor power (nv, P/Pn)
  • Calculation of the top flux, bottom flux, flux average value and flux deviation
  • Linear analog outputs
  • Generation of analog and binary outputs for the reactor protection system
  • Built-in test signal generators (remote activation possible)


The power range PRM 501 monitor forms part of the digital Neutron Flux Monitoring Systems (NFMS) proTK™ product line. It is used, in combination with neutron ionization chambers (B-10 detectors) for ex-core neutron flux monitoring in the power range.

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

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