For example,
New incident primary circuit flamanville:
Upon stop until October 1, 2025the EPR of Flamanville (Manche) continues, however, to be talked about.
While the teams are still working to solve the problem of valves – Two of the three valves located at the top of the pressurizer. However, responsible for maintaining water from the primary circuit at a pressure of 155 bars, did not fully meet the expected sealing criteria – a new incident has been reported. Furthermore, On August 12, EDF indeed declared to the ASNR a significant event, occurred a week earlier.
A valve that remained open and no alarm – New incident primary circuit flamanville
Back to August 5. In “the framework of the management of a hazard”. Meanwhile, a pump of the train 4 new incident primary circuit flamanville of the Ris-RA system is disconnected for diagnosis and intervention. Furthermore, As a reminder. this system has a important role Since it ensures the injection of borée water in the primary circuit (in the event of a breach on the primary circuit in particular) or to cool the reactor by allowing to evacuate the residual power released by the fuel still in tank.
Only. at the time of this intervention, in the state of the reactor and therefore with the pump arrested, “a permanent prescription of the STE asks isolation Heat exchanger, ”explains the ASNR in his opinion of incident.
Thus. this allows the cooling part of the pump, and then avoids a dilution Borre not controlled in the primary circuit, and avoid “a controlled chain reaction”.
It is this prescription that has not respected. “The valve guaranteeing isolation has been open several times “, Details the new incident primary circuit flamanville ASNR. But above all. the nuclear gendarme specifies that it was opened “without the alarm in the control room associated with the opening of this valve when the pump is stopped did not trigger ».
Everything is good that ends well …
Fortunately, everything is good that ends well. The gap was detected the next day and “the installation was Building ». Finally, the permanent prescription “was not respected intermittently over a total period of about five hours». But the incident pose question.
On the side of EDF, “the valve was immediately closed. And this event did not lead no consequenceOn the safety of the installations. The circuit concerned was isolated. chemical controls were carried out before the pump is put into service, ”says the operator.
The exact new incident primary circuit flamanville cause of the absence of the alarm trigger is being analyzed.
This is where the incident could question. According to one of our sources, the alarm would have been inhibited.It could then be a Design defect.
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