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Whilst other suppliers may possess different scheduling or cost modelling tools, such alternatives would not constitute a reasonable substitute because:\nResults would not be directly comparable with existing LEOPARD models and datasets previously provided by Orano during the life of the previous contract;\nIt will create a material risk of inconsistency in assumptions, methodologies and outputs.\nMigration to an alternative platform would require significant redevelopment, including reconstruction of established models, data structures, assumptions and validation processes.\nAlternative software would not replicate LEOPARD's proprietary algorithms, modelling architecture and decommissioning-specific functionality. As a result, NRS Dounreay considers that no reasonable alternative exists that would meet the operational requirement. 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