Office for Nuclear Regulation

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Harwell Planned Inspection

Executive summary

Purpose of intervention

This was a planned inspection at Magnox Limited’s (MXL’s) Harwell site, undertaken as part of the planned intervention strategy for the Harwell site for 2015/16.

Interventions Carried Out by ONR

On 30 June 2015 an ONR team consisting of the outgoing nuclear safety site inspector for Harwell, the incoming nuclear safety site inspector for Harwell and a project inspector assessed Level 1 emergency exercise “FOXGLOVE”.  This emergency exercise was intended to demonstrate the site's arrangements, under Licence Condition 11 (LC11) “emergency arrangements”, for dealing with any accident or emergency arising on the site and their effects.

As part of the handover between the outgoing and incoming ONR nuclear safety site inspectors for Harwell and Winfrith, we (incoming and outgoing site inspectors) undertook a review of relevant issues in the ONR issues database with MXL.

Explanation of Judgement if Safety System Not Judged to be Adequate

Not applicable.

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

In relation to LC11, I (outgoing nuclear safety site inspector for Harwell) considered that the planning for the exercise was thorough, and that the scenario was proportionate to the hazards remaining on site whilst remaining challenging of the emergency arrangements.  During its observations of the emergency exercise, the ONR team identified a number of good points and a number of areas for improvement.  Three areas for improvement were identified.  ONR will write to site providing all its observations.  This letter will request a reply which provides a review of the three areas for improvement and the site’s proposed corrective actions.  Taking into account the exercise planning/ scenario and all the ONR team’s exercise observations we considered the emergency exercise to be an adequate demonstration of the site’s emergency arrangements.  Taking all these factors into account we assigned an Integrated Intervention Strategy (IIS) rating of 3 (adequate) to LC11.

In relation to relevant issues in the ONR issues database I (outgoing site inspector) considered that overall, adequate progress is being made.  I have updated all issues owned by myself and these issues will now be transferred to the incoming site inspector.

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, no matters have been identified that are likely to have a significant impact on nuclear safety on the site at this time.  Therefore, no additional regulator action arising from this visit is considered necessary at this time.