- 327 - powering, by a diesel generator set, a fan for the PuO2 storage pits. As the diesel generator sets have an autonomy of several hours, the licensee plans refuelling them with diesel fuel brought in transportable tanks from the site's safeguard fuel stock. Loss of rotation of the DPCs in units T1 and R1: Assuming the loss of the electrical power supply to the pendulum-type centrifugal decanters (DPC), including the backup supply in an aggravated scenario, return to the ultimate safe condition involves unclogging amalgamated solid particles to cool them down, which requires: manually rotating the decanter bowl; then injecting water under pressure from a tank provided for that purpose. These operations are planned for in the emergency organisation in place on the La Hague site. Loss of dilution of hydrogen generated from radiolysis: For the management of a severe accident associated with the loss of dilution of radiolytic hydrogen, the licensee plans supplying air from compressed air cylinders. The connections between the tank sweeping pipes can be made with connecting hoses. Measures envisaged to reinforce the existing measures and proposed studies Loss of cooling: In addition to the means existing on the site, the licensee plans studying: installing quick-fitting couplings on certain internal loops of the cooling systems of equipment requiring remedial action within 48 hours; increasing the inventory of motor-driven pumps and associated accessories in order to cater for the compounded nature of the scenario and distribute the water necessary for the facilities to attain the ultimate safe condition; adapting the ventilation systems of the BSI and BST1 storage areas to allow a minimum level of passive cooling. The licensee also envisages drilling wells to establish a water supply from the water table. Loss of dilution of radiolytic hydrogen: In addition to the means already present on the site, the licensee plans studying the installation of compressed air cylinder racks in certain buildings were remedial action with respect to radiolytic hydrogen sweeping is required within less than 48 hours. Proposed studies to complete the procedure: The licensee has undertaken to submit a cross-site emergency management study (coordination and intervention means), integrating: the consideration of potential compounding factors (fire, explosion, load fall, criticality, hazardous substances, installations classified on environmental protection grounds (ICPEs)) that could speed up the occurrence of feared situations or disturb remediation actions; assurance of the operability of the emergency means in the context of an overall assessment of the status of the site and its environment, for all the hazards considered in the CSAs, including those associated with the communication routes and the industrial environment, induced effects included; the impact of potential transport accidents on the La Hague site on the feasibility of the emergency management actions.
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