Office for Nuclear Regulation

Sizewell A System Based Inspection on Grid Building Demolition 

Executive summary

Purpose of Intervention

This inspection was undertaken as part of a planned programme of inspections for 2018/19 at Magnox Ltd.’s Sizewell A licensed nuclear site.

Interventions Carried Out by ONR

During this visit, I undertook a System Based Inspection (SBI) on the preparations for the Grid Building Demolition Project. The inspection was carried out against the requirements of LC’s 10, 23, 24 27, 28 and 34. 

I also undertook a general site walk-down, including a visit to the Cooling Water Pump-house.

I sought information on progress with the decommissioning of the ponds and the FED retrievals plant and aspects of the remote management of the Bradwell site.

I participated in a conventional health and safety inspection targeted at work to remove asbestos contaminated materials from the site.

Explanation of Judgement if Safety System Not Judged to be Adequate

Not applicable.

Key Findings, Inspector's Opinions and Reasons for Judgements Made

I examined a sample of the Site’s management arrangements for handling nuclear matter and for managing operations on the site. There is a clear management structure and process.  An established and effective process for managing the project work for the demolition of the structure is in place. Therefore, I rated compliance with LC’s 10, 23, 24, 27, 28 and 34 as adequate.

The plant and equipment in the cooling water pump-house has been removed and the area is now redundant. It would be a suitable place to dispose of rubble left from the demolition of the remaining facilities.

Conclusion of Intervention

From the evidence gathered during this inspection, in respect of the demolition of the grid building, I concluded that the arrangements are adequate and no matters of significant nuclear safety concern were identified.

Magnox Ltd should give consideration to re-purposing the cooling water pump house as a repository for rubble currently stored above ground when other facilities are demolished.