- 214 - 1.2 Overview of the sites and facilities 1.2.1 Experimental reactors Reactors operated by the CEA Osiris The Osiris reactor is situated in the north-east section of the CEA Saclay centre. This centre is situated on the Saclay plateau, about 20 km south-west of Paris. The site accommodates other BNIs operated by the CEA, including the ORPHEE (BNI 101) and ULYSSE (BNI 18 under decommissioning) reactors, the POSEIDON (BNI 77) irradiators, the LHA (BNI 49 under decommissioning) and LECI (BNI 50) laboratories, and another BNI operated by CIS bio International (BNI 29). In addition, the site comprises several activity zones within a 5-km radius (technological domains of Saclay and Saint-Aubin, the "Les Algorithmes" technological park, the SOLEIL facility, etc), university and research organisations (SUPELEC, CETIAT, CNRS, University of Orsay, INRA, etc.) and a large population around the plateau (south-west Paris suburbs, Chevreuse Valley, etc.). The area around the site also features several major communication routes. The Osiris pool-type reactor with a licensed power of 70 MWth, is intended primarily for the technological irradiation of structural materials and fuel for different power reactor processes. It is also used for a few industrial applications, especially the production of medical radionuclides. It is operated by cycles. Its critical mock-up, the 700 kWth ISIS reactor, is today essentially used for training purposes. This reactor is not concerned by the CSA exercise in 2011. These two reactors were licensed by decree of 8 June 1965. ASN Decision No.2008-DC-0113 of 16 September 2008 set the definitive operating shutdown of the Osiris reactor as 2015 at the latest. The facility comprises: the reactor building which constitutes the containment vessel and houses the reactor pool containing the reactor block (70 MWth), a storage and transfer channel and the mechanisms; the peripheral annex buildings containing the hot shops, a truck airlock, the crown gallery with the ventilation/air-conditioning equipment among other things, experimental facilities, storage areas and the SPR (Radiological Protection Service) laboratory; the building containing the ISIS reactor (700 kWth). The facility's last periodic safety review was carried out in 2009. In view of the renovation work finalized at the end of 2010 (Aménophis project), such as the installation of a backup ventilation system, ASN considered at the end of this review that the Osiris reactor could remain in operation until 2015.
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