- 166 - In its CSA reports, EDF describes the site emergency organisation planned to respond to incident, accident or severe accident (SA) situations. This organisation is described in the site On-Site Emergency Plan (PUI), which is required by the regulations and devised to cover situations presenting a significant risk for the safety of the facilities, and which can lead to the release of radioactive, chemical or toxic substances into the environment. The PUI covers the management of SAs. It also describes the measures designed to aid and protect the persons present on the site, preserve or restore the safety of the facilities and limit the consequences of accidents for the public and the environment. The PUI defines the functions necessary for managing the emergency and the conditions of shift relief. EDF also describes the diverse provisions of the PUI to ensure optimised personnel intervention: Personnel safety: the staff shall be grouped at assembly stations in order to count and inform them. EDF indicates that the means implemented in normal operation to monitor radiological conditions on the site and to monitor the personnel remain operational and adapted to the conditions that can exist in SA situations, except in the event of total loss of electrical power. Lastly, if the site is contaminated, control room ventilation is switched to iodine traps to prevent it being contaminated by radioactive iodine; Emergency team preparation and speed of response: immediate action shall be taken following occurrence of the SA, in direct application of the operating procedure documents; Intervention: the mobile devices implemented under the PUI are stored and routed so as to limit personnel exposure during assembly and utilisation of the devices in an accident situation. The outside technical support resources the sites can call upon is also described in the CSA reports. They can for example be provided by Intersite Assistance, AMT-C (EDF's Thermal Maintenance Agency - Centre), Groupe INTRA, etc. The conditions of mobilisation and intervention of these resources form the subject of agreements between the sites and the entities on which they depend. The procedures implemented in the management of SAs, the training and exercise drills are also detailed in the CSA reports. These three points form part of the GIAG (Severe Accident Intervention Guide) and the sites' PUI baseline. In practice the initial operator training syllabus presented by EDF already includes a part devoted to "Severe Accidents", and exercises simulating SA situations are held regularly. Certain national PUI exercises can therefore be based on scenarios simulating entry into the SA domain. The internal PUI exercises held by EDF cover all the domains, design accidents, fuel building (BK) incidents and severe accidents. EDF moreover indicates that it has analysed the sizing of the operating teams for application of the current severe accident management procedures, particularly for events affecting several reactors. EDF indicates that in this context it has postulated the situation where it is impossible for the on-call teams to reach the site for the first 24 hours following an unpredictable large-scale hazard affecting the entire site. EDF concludes from these analyses that the sizing of the operating teams, in conformity with the current baseline, does not always allow application of the SPE (permanent surveillance document), and notably the surveillance of the criterion for opening the pressuriser relief lines (LDP) in the event of a severe accident affecting two reactors. This finding led EDF to study the appropriateness of the human and material resources for the deployment of the hard core equipment items (including the immediate measures specified in the GIAG) and the additional equipment proposed further to the CSAs. The main steps involved in this study, the conclusions of which are scheduled for the end of 2012, are: listing of the duties to accomplish (emergency management, control of the facilities, etc.) on all the reactors of a site; listing of the activities to carry out with their main characteristics, such as duration, conditions of interventions, etc.; identification of the additional material resources to be implemented, taking their utilisation constraints into account from the design stage; final verification of the suitability of the human resources (numbers and skills) for all the activities to be carried out; identification of any additional training needs.
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