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WRM 501™

Wide Range Monitor

Wide range monitor used with fission chamber for ex-core neutron flux monitoring in the start-up range.

Tag Features

  • Qualified to perform safety functions
  • Seismic qualification
  • Available with fission chambers of various sensitivities
  • High longevity due to the robustness of fission chambers
  • LOCA proof fission chambers are available
  • Wide measurement range (combined pulse + Campbell (AC) mode) up to 12 decades
  • Signal filtering with adaptive time constant
  • Calibration to neutron flux signal or reactor power (nv, %FP)
  • Calculation of the relative flux change rate (reciprocal of the reactor period) or rate of change of reactor power (in decade/min)
  • Linear and/or logarithmic analog outputs
  • Generation of analog and binary outputs for the reactor protection system
  • Built in test signal generators (remote activation possible)


The wide range WRM 501 monitor forms part of the digital Neutron Flux Monitoring Systems (NFMS) proTK™ product line. It is used, in combination with fission chamber, for ex-core neutron flux monitoring in the start-up range.

The associated DWK 250™ processing unit has been designed and is qualified (in hardware and software). It provides functions that can be used at the level of the reactor protection system.

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