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PRM 502™

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Local and Average Power Range Monitor (In-Core Neutron Flux Instrumentation for BWR Applications)

Prm502 001

Power range channel used with fission chambers for in-core neutron flux monitoring.

Tag Features

  • Qualified to perform category A functions
  • Up to 4 in-core fission chambers per DSK 250™ channel
  • Up to 64 LPRM signals (16 DSK 250 channels) can be connected to the DMK 250™ processing unit for average power range monitoring
  • Compatible with in-core fission chambers of various sensitivities
  • Fission chambers for extreme environmental conditions (temperature, pressure, radiation,...)
  • Individual adjustable detector supply
  • No preamplifier required between detector and DSK 250 channel
  • Signal filtering with adjustable time constant
  • Neutron flux signal for each detector
  • 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 502™ monitor forms part of the digital Neutron Flux Monitoring Systems (NFMS) proTK™ product line.

It is used in BWR type reactors in combination with fission chambers for in-core neutron flux monitoring in the power range and the signal processing units DSK 250 and DMK 250 channels.

The DSK 250 processing unit has been designed and is qualified (hardware and software) to provide the flux density for each detector position, i.e. perform the functions of a “Local Power Range Monitor” (LPRM).

The associated DMK 250 processing unit calculates the average and flow related flux signal, i.e. functions as an “Average Power Range Monitor” (APRM).

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