- 255 - On completion of the verification of conformity of the facility with the design requirements, the licensee confirms: the good general condition of the civil engineering structures; the satisfactory behaviour of the mechanical equipment, particularly with regard to the aging mechanisms (ionising radiation, fatigue, corrosion); the adaptation of the maintenance programme to the monitoring of equipment conformity relative to the ventilation systems; that this approach has enabled the robustness of the provisions associated with control of the criticality risk to be improved. Regarding equipment aging and obsolescence, the licensee has upgraded its monitoring procedure by instituting a global cross-facility process covering all the facilities in the plant. The licensee indicates that the deviations found when verifying conformity of the operating practices with the applicable frame of reference were systematically analysed. The large majority of them were dealt with immediately. The remaining deviations were entered in the plan of actions resulting from the review. These elements will nevertheless be included, along with the review file, in the scope of the appraisal that ASN will demand of the advisory committee of experts for laboratories and plants. The analyses carried out to verify the conformity of operating practices with respect to the applicable frame of reference enabled: the understanding and applicability of the operating instructions to be improved, the operating documentation to be simplified. The safety re-evaluation The re-evaluation of safety carried out during the period safety review was based on: the main regulatory changes occurring over the 1999-2009 period; the operating and monitoring results for the facility (production balance, discharge balance, waste balance, accumulated dose) and the results of the modifications made to the facility over the 19992009 period; the results of internal deviations concerning safety occurring over the 1999- 2009 period and the corresponding experience feedback, particularly the significant events notified to ASN; the national and international experience feedback (REX) acquired on facilities other than Mélox); the development of the state of the art, knowledge and analysis methodologies (criticality, thermal design, organisational and human factors); the conclusions of the conformity review; the foreseeable changes on the facility; the requests formulated by ASN. According to the licensee, this work does not call into question the safety and operating provisions in effect, but enabled it to identify a series of improvements whose application should help reinforce the lines of defence. On completion of the ongoing review, ASN will give its opinion on the results of the periodic safety review at the beginning of 2013. Furthermore, ASN has inspected the facility on the theme of conformity. This inspection revealed no major deviation from the safety frame of reference applicable to the facility. Assessment of the safety margins The facility robustness analysis focused on the civil engineering of the buildings that enabled static containment to be obtained on the buildings 500, extension 500 and 501, and guaranteeing the stability of buildings 504 and 506, and the sensitive equipment necessary for placing the facility in a safe state.
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