In-loop oxygen reduction in HLM thermal-hydraulic facility NACIE-UP

The sensor showed that a deep oxygen reduction in the LBE was successfully obtained, even if the optimal working concentration for the operation of a HLM nuclear system was not achieved. The oxygen concentration was globally reduced from 10−6 to 10−12% in weight at around 250 °C. Furthermore, the sensor revealed the establishment of M/MxOy equilibria in the expansion vessel, indicating that metal impurities dissolving from loop steel walls were here collected and influenced the electric potential of the sensor.