A close look at a few BNIs undergoing decommissioning The installations vary widely and the decommissioning constraints may differ from one BNI* to another. Installation: 70 MWe CO2-cooled heavy water reactor in Brennilis (Finistère département) Licensees: CEA, then EDF Commissioned: 1967 Final shutdown: 1985 Decommissioning phases n The fuel is removed, and decommissioning is completed for the buildings “outside the reactor block” (exchangers, effluent treatment station, waste hangar, etc.). n Since 2018, a new file has been under review for management of the reactor block decommissioning operations. n End of decommissioning envisaged by EDF: in the 2040s. Decommissioning challenges Decommissioning of this unique reactor in a confined space, which notably requires the use of remote-operated resources. Brennilis Installation: two 500 MWe GCR type reactors in Saint-Laurent-Nouan (Loir-et-Cher département) Licensee: EDF Commissioned: 1969 and 1971 Final shutdown: 1990 and 1992 Decommissioning phases n The fuel is removed and some of the equipment “outside the reactor vessel” is being dismantled (spent fuel pool, etc.). n Dismantling, initially planned to be “under water*” will now be performed “in air*”. n New decommissioning file planned for the end of 2022. n End of decommissioning envisaged by EDF: end of the century. Decommissioning challenges The licensee must ensure that management solutions are available for the graphite components and reduce the overall decommissioning time-frame. Saint-Laurent A * See glossary page 30 16 • Les cahiers de l’ASN • June 2022 BNIs BEING DECOMMISSIONED
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