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In page Sellafield:

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On 13 January 2015, the NDA announced that NMP would lose the management contract for Sellafield Ltd as the "complexity and technical uncertainties presented significantly greater challenges than other NDA sites", and the site was therefore "less well suited" to the NDA's existing standard management model.[12] The new structure, which came into effect on 1 April 2016, saw Sellafield Ltd. become a subsidiary of the NDA.