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Calculations taking into account the activation and contamination of the components of large Fast Breeder Reactors (types SPX1/SPX2) have been performed. The decay time influence has been studied for some representative structures of the reactor block. The main radionuclides are: - Fe-55 and Co-60 for short-term decay (activation), - Ni-63 and Nb-94 for long-term decay (activation), - Cs-137 and Na-22 for contamination. From these elements, the phases of final shutdown and decommissioning to be followed according to the different AIEA levels have been estimated. The benefit and the possibility of reducing the cobalt content has been examined, and the possibility of substitution of the cobalt-base hard coating. The proposed modifications for the internal structures design and the superior closing (roof, plugs) will improve the decommissioning procedures. The last point examined concerns the overall plant layout. Several improvements, connected to the means of handling, the packing and the conditioning area of the reactor block structures, are proposed: it is particularly necessary to provide a multi-purpose handling device for decommissioning, and to make provision for the future use of certain equipment (cell and fuel storage tank).

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Authors: FOURNIE J L, Novatome, Lyon (FR);ALARY C, Novatome, Lyon (FR);JEAN M, Novatome, Lyon (FR);MAIRE D, Novatome, Lyon (FR);PEYRARD G, Novatome, Lyon (FR)
Bibliographic Reference: EUR 12991 FR (1990) 69 pp., FS, ECU 7.50
Availability: (2)
ISBN: ISBN 92-826-1744-0
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