Office for Nuclear Regulation

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Planned Licence Condition Compliance Inspection

Executive summary

Purpose of intervention

Planned intervention at Magnox Ltd’s Wylfa licensed site, undertaken as part of a series of planned interventions outlined in the ONR Integrated Intervention Strategy (IIS) Plan Wylfa Power Station 2014/2015.

Interventions Carried Out by ONR

Planned compliance inspections of Licence Condition 7 ‘Incidents on Site’, 22 ‘Modification or Experiment on Existing Plant’ and 15 ‘Periodic Review’ were undertaken. In addition a number of liaison meetings were held to progress general matters of interest and review of progress with regulatory issues.

Explanation of Judgement if Safety System Not Judged to be Adequate

No safety system based inspections were undertaken during this intervention.

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

Inspection of Licence Condition 22 found that arrangements appear to be implemented to a good standard. Documented arrangements are adequate and a number of opportunities have been identified that could provide opportunities for improvement under ALARP.  A sample of lower safety significant modifications indicates some further clarification on the basis for categorisation would be beneficial to the regulator to provide assurance that they are appropriately categorised.

Inspection of the Wylfa 2014-2024 Periodic Safety Review (PSR) (Licence Condition 15) confirms  that progress with MxL findings, work arising and ONR findings are demonstrably adequate. Committed dates for delivery of close out for these have been provided by MxL and appear reasonable and consistent with regulatory expectations. MxL are advised that any threat to these commitments should be brought to ONR's attention as early as possible. It was agreed that quarterly progress review meetings with ONR should continue. MxL will ensure that closure statements and supporting evidence are provided proactively to ONR as findings and work arising is addressed.

Inspection of Licence Condition 7 confirms that Wylfa has mature arrangements that are demonstrably adequate. Investigation reports sampled are produced to a good standard. Investigations appear thorough and provided a suitable basis to deliver improvements. Whilst the fundamental requirements of the licence condition and arrangements appear to be met the robustness of the implementation appears weak in the setting of corrective actions, close out of actions and effectiveness review. ONR will seek commitments from MxL to undertake a rigorous and comprehensive inspection of this element of its procedures and provide conclusions to the ONR site inspector within a suitable timescale.

Examination of aspects of task observations in support of OEF has also identified apparent weaknesses indicating that performance indicators are driving delivery of observation rather than quality of information. ONR will seek MxL commitment to review its approach to task observations and explore whether a change in approach may be necessary to ensure the process provides real benefit.

Liaison meetings covered the following topics:

For each of the topics covered suitable responses by either Magnox Ltd or ONR were identified to progress matters towards adequate conclusions.

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

There are no findings from this inspection that could significantly undermine nuclear safety and no change to the planned interventions and inspections of Wylfa power station.