The French nuclear security authority ASN (Autorité de Sécurité Nucléaire), examined the info offered by EDF (Electricité de France) to exhibit the seismic resistance of the Donzère-Mondragon canal embankment which protects the Tricastin NPP. ASN considers that, following the investigations and repairs carried out by EDF, the situation of the embankment permits the restart of the EDF reactors and gave its consent for the restart of reactors 2, three and four.
On 27 September 2017, ASN ordered momentary shutdown of the Tricastin NPP as a result of threat of failure of a 400 metre lengthy portion of the Donzère-Mondragon embankment within the occasion of an earthquake. The assessments carried out confirmed that the flooding that may outcome from failure of the embankment would have triggered a nuclear gas soften accident within the 4 reactors of the Tricastin NPP and would have made deployment of the on-site and off-site emergency administration assets significantly troublesome.
EDF strengthened the portion of the embankment involved, after having carried out geotechnical surveys to acquire a extra detailed characterisation of its composition. The evaluation carried out by IRSN on the request of ASN on the strengthened embankment confirms that there can be no failure within the occasion of a secure shutdown earthquake (SSE), which is the biggest earthquake studied within the nuclear security case. It nonetheless revealed that, in sure circumstances, there’s a threat of localised landslips which, with out compromising the soundness of the embankment, would require restore work to be carried out subsequent to an earthquake. EDF has subsequently pre-positioned tools within the neighborhood of the embankment, so as to have the ability to perform these obligatory works to restore any landslips noticed following an earthquake.
EDF has undertaken to implement enhanced monitoring of the embankment and has outlined the related measures. Finally, EDF intends to additional strengthen the embankment in order that it may possibly face up to the acute earthquake outlined within the stress exams carried out within the wake of the Fukushima Daiichi accident.
The Tricastin Nuclear Power Plant is a nuclear energy plant consisting of four pressurized water reactors with 915 MW electrical energy output every. The energy plant is positioned within the south of France (Drôme and Vaucluse Department) on the Canal de Donzère-Mondragon close to the Donzère-Mondragon Dam and the commune of Pierrelatte. (Source: ASN)

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