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SGLM 201K™

Steam Generator Leak Rate Monitor

The SGLM 201K monitors steam generator leak rate in PWR nuclear power plants by measuring 16N volume activity.

Tag Features

  • 16N monitoring when reactor power exceeds 25%
  • Gross gamma energy monitoring when reactor power < 25%
  • Spectrum stabilization against temperature and aging drifts
  • 16 configurable windows over the measurement range
  • 1024 channels analysis
  • Available with or without display and local signaling
  • Seismically qualified
  • More than 800 SGLM channels in operation worldwide
  • Defined for mild environment conditions


The SGLM 201K monitor forms part of the RAMSYS™ product line. It has been developed for steam generator leak rate monitoring. The 16N count rate is measured by a scintillation detector (NaI). The detector is installed in close proximity to the main steam line and it is thermally insulated to protect it from sharp temperature transients. The conversion from 16N count rate to volumetric activity is done utilizing coefficient established through Monte Carlo analysis. The conversion from 16N volumetric activity to leak rate (in GPD) is calculated using four correlations. The correlations are derived by thermohydraulic transport analysis based upon data provided by the user.

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