- 220 - The main risks intrinsic to this facility are the toxic and radiological risks associated with the use of uraniferous, fluorinated, chlorinated and nitrated products. Between 2013 and 2015 these units will be progressively replaced by those of the Comurhex II project currently under construction, a facility that will be subject to the legislation governing ICPEs (installations classified on environmental protection grounds). The Socatri plant The Socatri plant repairs, decontaminates and decommissions industrial and nuclear equipment, and treats the effluents resulting from these activities and the uraniferous effluents produced on the Tricastin site. It was licensed by a decree of 22 June 1984. It comprises: an effluent preparation shop for the dissolution of deposits; stations for treating effluents containing uranium; washing facilities for decontaminating material; related storage activities, including for third parties: Andra (low-level and long-life radioactive waste) and EDF (contaminated material). The main risks in this facility are exposure to ionising radiation and contamination from effluents containing uranium and radioactive waste, as well as the chemical and inflammability risks inherent to certain substances. The AREVA NC plant in Pierrelatte (TU5 W) The TU5 facility transforms by defluoridation the depleted uranium resulting from the enrichment operations and by denitration the uranium recovered from the spent fuel reprocessing on the La Hague site, into uranium sesquioxide (U3O8). This BNI, licensed by a decree of 7 July 1992, comprises: the TU5 unit which transforms the uranyl nitrate produced during spent fuel reprocessing into U3O8 by denitration; the storage yard (P18) of 213 litre drums containing the U3O8 powder produced. The plant also includes an ICPE, the W plant, which converts the depleted UF6 into U3O8 and a BNIS corresponding to the CEA's former military gaseous diffusion plants, currently in the decommissioning phase. The main risks inherent to this facility are the risks of explosion associated with the inflammable substances (hydrogen), operation of the conversion furnace of the W plant, chemical risks associated with hydrofluoric acid in particular, and radiological risks. The Georges Besse II plant The Georges Besse II (GB II) uranium enrichment plant operated by the Société dEnrichissement du Tricastin (SET), uses the gas ultra centrifuge process. It will ultimately replace the Eurodif plant that uses the gaseous diffusion process. Creation of the Georges Besse II (GB II) plant was authorised by a decree of 27 April 2007. It comprises: two enrichment units (North and South) containing batteries of centrifuges in a cascade arrangement; facilities for the maintenance of the centrifuges and the supply of the inputs necessary for the enrichment units, the electrical power supply, etc.; the REC II unit for the transfer, sampling and inspection of the UF6 containers; interim storage yards. The main intrinsic risks result from the handling and storage of UF6, particularly within the REC II unit, where the UF6 will also be used in liquid form. At present only two modules (i.e. two times eight cascades) in the South unit have been put into service.
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