Office for Nuclear Regulation

Magnox Ltd - Wylfa Power Station - Planned Intervention

Executive summary

Purpose of intervention

This was a planned inspection of Magnox Ltd’s Wylfa power station, undertaken as part of the planned intervention strategy for the Civil Nuclear Reactor Programme (CNRP) of the Office for Nuclear Regulation (ONR).

The work was carried out in line with the planned inspection programme contained in the Wylfa Integrated Intervention Strategy (IIS).

Interventions Carried Out by ONR

This inspection bounded planned compliance inspections against the following Licence Conditions (LCs):

Licence Conditions 10, 23, 24, 27 & 28 were covered as the safety system inspection of the Wylfa power station arrangements for the High Voltage (HV) systems.

In addition to the inspections identified above a number of liaison meetings were attended to monitor progress with current activities and maintain awareness of any matters of regulatory interest. These included the following topic:

Explanation of Judgement if Safety System Not Judged to be Adequate

Not applicable – the system was judged to be adequate.

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

From the system based inspection on the HV Systems we concluded that:

Overall, we concluded that the arrangements and their implementation on the HV Systems met the requirements of the safety case and were deemed to be adequate.

The various liaison meetings undertaken provided useful updates on matters of regulatory interest and confirmed adequate progress is being made by Magnox Ltd in delivering against the topics discussed.

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 were no findings from this inspection that could significantly undermine nuclear safety.  At present, no additional regulatory action is needed over and above the planned interventions of Wylfa power station as set out in the Integrated Intervention Strategy, which will continue as planned.