Tome Architecture and management of a geological repository - Andra

5 – B waste repository zoneFigure 5.1.5Non-alloy steel container used as over-drum for 1000-litre concrete containersA second subset of packages, from the COGEMA La Hague site, contains technological or pulverulentwaste consisting of a mixture of resins, zeolites, diatoms and graphite, conditioned in a cement matrixinside cylindrical fibre-reinforced concrete containers, known as CBF-C’2 (see Figure 5.1.6).It should be noted that technological waste was conditioned between 1990 and 1994 in asbestoscementcontainers, which were replaced from 1994 onwards by fibre-reinforced concrete containers.Both types of container have the same geometry. The weight of the finished containers varies from 1.5to 3 metric tons, with an average of around 2.4 metric tons. The technological waste is made up ofmetal or organic materials. The equivalent ß-γ dose rate in pseudo-contact (5 cm) with the packages isaround 0.5 Sv/h, for the packages releasing the most radiation. For these packages, production ofhydrogen by radiolysis of the organic matter and cement matrix water is taken into account; thisproduction is from 1 to 2 litres 26 a year.Figure 5.1.6Cylindrical fibre concrete containers (CSF-C’2)A third subset of packages, manufactured by the CEA, consists of 1800-litre concrete containers filledwith various metallic and organic waste conditioned in a cement-bitumen matrix or in mortar. All ofthese packages were produced between 1964 and 1987: 25% of the concrete containers have been26At atmospheric pressure.Dossier 2005 Granite - ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL REPOSITORY101/228