There are three extant specifications (No's 324, 325 and 326) relating to Intermediate Level Waste stored in facilities in legacy ponds and silos at the Sellafield site.
The specifications are worded in such a way that they require radioactive wastes to be removed from their current locations and placed in safer storage conditions by particular dates. HSE is monitoring progress towards these dates and its Nuclear Installations Inspectorate wrote to Sellafield Ltd. on 29 September 2008 seeking information to inform future enforcement decisions should the work not be completed by the due dates.