The management of the Penly power station, in Petit-Caux, declared, on May 28, to the Nuclear Safety Authority (ASN), a level 1 incident on the Ines scale, which has 7. It s ” is the malfunction of one of the four monitoring sensors at the heart of reactor 1.
“On May 16, the operating teams shut down reactor n ° 1 for its scheduled partial visit, EDF reports in a press release. When the reactor power drops, one of the four intermediate detectors displays a measurement offset from the other three. A first analysis decrees the functional detector, diagnosis refuted in second analysis finalized on May 25. Repair of the offending detector is in progress. “
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“Diagnostic error”
The driving teams constantly monitor the flow of neutrons emitted by the reactor core to control any variation in power, specifies EDF. They have means of measurement: detectors used in normal operation (CNP), detectors used during start-up or shutdown of the reactor (CNI), and detectors capable of measuring very low fluxes when the reactor is stopped ( CNS). These detectors are used in the development of alarms and automatic protection actions in the event of an abnormal rise in neutron flux.
EDF ensures: “At all times, the other three detectors remained functional, the monitoring of the heart remained effective. However, due to a false initial analysis, management has declared this event. ” The nuclear power network analyzed the event and summarized it: “Problem on a reactor 1 power sensor, EDF does not see the failure.” And believes that this is a “Diagnostic error on essential equipment, repair of the sensor is in progress. Hopefully it will be of better quality than the first analysis. “
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