- 61 - the design of the cladding in the cells are sufficient for evacuation of the residual heat from the fissile material and confinement of the material. 1.113.5 Loss of electrical power supplies 3.5.1 Experimental reactors When this point was examined, the inspections showed that the distribution of responsibilities for the upkeep of the facilities (BNI / RTE) was clearly defined. There are agreements between the licensee and RTE and they make provision for priority resupply of the facilities in the event of a power break. The inventory of normal electrical power supplies and emergency backup resources is generally defined in the safety report. However, for the RHF, the safety report is not up-to-date on this point, but its update is scheduled for 2012. Updated plans were however presented on the occasion of the inspection. Only one electricity generator was designated as a safety requirement, given that the RHF is designed to be cooled for several days using natural convection with no circulating pump. With regard to the means for monitoring the operation of the electrical power supplies, a flowchart of the electrical lines was observed in the Phénix control room. This is kept up-to-date by a specific person. Operating memos and operating instructions are defined for each electricity supply source (diesel, normal supply, etc.). The electrical switchboards are also retransmitted to the RHF control room. A backup electrical switchboard is present in the emergency command post, in case the control room systems were to be destroyed by an earthquake (the building which houses it being the only one designed to withstand the earthquake). Generally speaking, the inspectors considered that the normal and backup electricity supply systems were in good condition and regularly monitored, in particular those of the RHF (parameters recorded during the rounds, periodic testing and testing at the beginning of each cycle). However, a number of inspections did show that further information or improvements were required on the performance of maintenance and certain periodic tests on the emergency resources, as well as how these resources are used, particularly with regard to: identification of the battery life safety criteria (RHF); the need to perform endurance tests on the backup generator set GES (RHF); the practicalities of resupplying the RHF's backup electricity generator in the PCS (management of the fuel reserve in particular) and the requirements concerning fuel quality, along with the associated verification methods; traceability of monitoring of first-level maintenance of the electricity generating sets, performed by a contractor (Osiris); qualification retesting of the air tanks, pressure vessels, electricity generating sets (Phénix); the strategy concerning the use of CEA Grenoble's mobile electricity generator for the RHF; the lack of any formal procedure for ranking of priorities concerning deployment of the emergency resources, in particular with regard to the electricity power supplies, especially for Osiris on the CEA Saclay site. During the visits to the facilities, the inspectors observed that for Phénix, the documents available to the personnel on entering the room in the event of intervention on the electricity generating set were in poor condition. One of these documents mentioning the electrical emergency stop position of the electricity generating set was not fully representative of the layout of the existing safety devices. The availability of the access routes necessary for bringing in the emergency resources, especially in the event of earthquake or flooding, needs to be guaranteed. 3.5.2 Nuclear fuel cycle facilities La Hague site The loss of electrical power supplies to the site is an accident that could result from an earthquake, or from flooding, or from loss of the ERDF grid. Electrical power is needed to maintain certain safety functions in the facilities, such as cooling of the pits or fission products, ventilation of the storage areas or
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