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In post-accident situations such as a loss-of-coolant accident (LOCA) or loss of secondary feedwater, core coverage is necessary to assure continuity of cooling.


The Reactor Pressure Vessel Level Measurement System (RPVL) provides information on the coolant inventory to enable counter measures to be taken if necessary, for example, primary pressure relief, start and stop of coolant injection. The basic principle used by RPVL is the change in heat transfer between water in a liquid and gaseous phase. For this reason a sensor comprises a heated and an unheated thermocouple. The level monitoring is based on the difference in temperature between the two thermocouples, which is higher when water is in a gaseous rather than liquid state. 

Your Benefits

  • Excellent reliability and availability thanks to wellestablished components providing robust signals
  • Low operating costs thanks to a low level of maintenance based on standard test equipment
  • Self monitoring with fast response and clear indication facilitates troubleshooting


RPVL is currently installed in 20 reactors worldwide (EPR reactors, Russian-type VVER reactors, KWU plants, and pressurized heavy water reactors).

Interested in Reactor Pressure Vessel Level Measurement System – RPVL ?

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