Office for Nuclear Regulation

Magnox Ltd Winfrith - Dragon System Based Inspection 

Executive summary

Purpose of Intervention

During this intervention, I carried out a System Based Inspection (SBI) on the Dragon decommissioning project structures to ensure adequate implementation of the following licence conditions:

Whilst on site I held meetings with the safety representative to follow up on the status of actions relating to compliance with the Representatives and Safety Committees Regulations 1977.

My inspections comprised plant inspection, office-based examination of procedures and records and interviews with staff.

Explanation of Judgement if Safety System Not Judged to be Adequate


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

This SBI was targeted at Dragon decommissioning project outer containment structure, the inner containment structure, the bio-shield and the polar crane.

I inspected the training records for the maintenance staff and operators. I found that all such persons had relevant qualifications and current training records for maintenance and operations relating to the structures inspected.

I reviewed the decommissioning safety case documentation, the hazard analyses and the associated management arrangements to ensure that systems, structures and components had been clearly identified and the safety function was in accordance with the appropriate management arrangements.  I found the documentation clear and that safety related equipment was adequately identified.   

I inspected the operating and maintenance instructions for the structures. I found that the instructions that I sampled were clear and concise and clearly identified references to the safety related equipment. The licensee also demonstrated that no operations were undertaken which might affect the structures, unless appropriate safety documentation was issued and that operations were controlled and supervised by appointed suitably qualified and experience persons.

I undertook a plant walk-down. I noted that the building and remaining plant were in a good condition.

I found that the licensee is undertaking suitable examination, inspection, maintenance and testing activities for the structures.  All maintenance records sampled were within date and legible.

Conclusion of Intervention

From the evidence gathered during this SBI, I judge that the licensee has made and implemented its arrangements adequately to ensure the safety of the Dragon decommissioning project systems/structures and that there are no matters that may impact significantly on nuclear safety.