Office for Nuclear Regulation

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Winfrith – System and Compliance Inspection

Executive summary

Purpose of intervention

This report covers an inspection of Magnox Ltd’s Winfrith nuclear licensed site on 13th – 15th and 21st July 2015. This inspection was undertaken as part of a programme of planned interventions as outlined in the IIS plan for 2015/16.

Interventions Carried Out by ONR

During this intervention, I carried out a system compliance inspection on the Steam Generating Heavy Water Reactor civil structures against the following licence conditions:

I also carried out Licence Condition (LC) compliance inspections to verify compliance with the following Licence Conditions:

My inspections were carried out against the requirements of ONR's published inspection guidance associated with the above Licence Conditions.  The inspection comprised office-based examination of procedures and records and interviews with staff.

Whilst on site I held meetings with the licensee to discuss follow up the status of actions and held meetings to discuss a number of routine matters.

Explanation of Judgement if Safety System Not Judged to be Adequate

The safety system inspected was judged to adequately meet the requirements of the safety case.

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

In relation to the system compliance inspection of the Steam Generating Heavy Water Reactor civil structures, I reviewed the licensee’s safety case and consider that it accurately represent the facility and identifies the associated hazards and risks. I consider the safety case also identified appropriate key safety related equipment.

I reviewed the process, documentation and staff competences used to maintain the civil structures and found evidence of clear maintenance procedures that were capable of being understood by operators.

I reviewed the maintenance that had been carried out and associated records. I consider that the licensee’s arrangements in place to carry out periodic inspection of the civil structures meet the safety case requirements adequately.

Based on the evidence gathered during this inspection, I consider that the licensee has implemented its arrangements adequately to ensure the safety of the Steam Generating Heavy Water Reactor civil structures.

In relation to LC 35 Decommissioning, I considered the licensee’s decommissioning strategy and programme. Despite Magnox Ltd undertaking a major review of decommissioning and that as a consequence the decommissioning plan may change, I consider that for now the licensee had demonstrated that it has implemented its decommissioning arrangements adequately. I consider that this licence condition should be rated 3 (adequate).

In relation to LC 36 Organisational Capability, the licensee was able to demonstrate that it had produced an adequate nuclear baseline that included staff roles and appointments for the management of nuclear safety. I noted that the baselines identified staff vulnerabilities and headcount. I considered that the format of the baseline was clear and easy to understand.

Whilst I note that MxL is undertaking a staff reduction exercise, I consider that for now, and based on the records that I selected, Winfrith has a properly defined nuclear baseline that is adequately resourced in relation to the other activities undertaken in this intervention, no key findings arose.

The intervention was performed in line with ONR’s guidance requirements (as described in our technical inspection guides) in the areas inspected.

Conclusion of Intervention

From the evidence gathered during this intervention, I conclude that there are no matters that may impact significantly on nuclear safety. However a number of improvements have been identified that the licensee has agreed to implement.