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The SGLM 202K monitors steam generator leak rate in VVER nuclear power plants by measuring 16N volume activity. The NaI scintillator is embedded in a 2 π 2’’ lead shield.
The SGLM 202K monitor from the RAMSYS™ product line has been developed for steam generator leak rate monitoring in WWER nuclear power plants.
The 16N volume activity (in counts per second/Cps) measured by a NaI scintillation detector inside a lead shielding facing the live steam line is converted to Bq/m3 (or μci/cc) through a coefficient calculated from Monte Carlo analysis on the basis of relevant data provided by the user. An algorithm which is based upon thermal hydraulic transport phenomena modeling uses the measured 16N activity, the reactor power, the steam flow rate and the transport time (in the primary and in the secondary loop) to assess the steam generator leak rate.
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