Office for Nuclear Regulation

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Wylfa - Planned 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) for Wylfa Power Station 2014/2015.

Interventions Carried Out by ONR

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

Licence Conditions 10, 23, 24, 27, 28 & 34 were covered as part of a system based inspection (SBI) of the Gas Safety Release Valves (GSRVs).

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, Regulatory Review Meeting, Site Stakeholder Group meeting, Internal Regulation, Incidents on Site, Emergency Exercises and a review of ONR issues.

Explanation of Judgement if Safety System Not Judged to be Adequate

From the inspection, I judge that overall the GSRV safety system provisions meet the requirements of the safety case and are adequate.

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

An SBI of the GSRV’s was undertaken to judge the adequacy of the station arrangements made to ensure the system will perform its safety function. In deciding if suitable and sufficient measures have indeed been put in place for the safety system, these inspections consider compliance with a number licence conditions. The standard consideration of LCs during SBIs are LCs 10, 23, 24, 27, 28 & 34.

The system inspection found that the licensee has made arrangements to ensure that the GSRV is maintained and operated in accordance with its safety case, and that on the basis of the inspection sample the arrangements are deemed to be implemented in an adequate manner and in some instances to a good standard. Therefore, an inspection rating of 3 (adequate) is assigned in respect of LCs 10, 23, 24, 34 and an inspection rating of 2 (good standard) for LCs 27 and 28. It is judged that overall the system meets the requirements of its safety case and is adequate. During the inspection, some minor opportunities for improvement were identified that station has agreed to address, and ONR will monitor the action they take during routine inspections at the site. 

The various liaison meetings undertaken provided useful updates on matters of regulatory interest and confirmed adequate progress 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

From the information gathered and evidence obtained during this intervention, no matters have been identified that are likely to have an adverse impact on nuclear safety on the station that are currently not being addressed.  Therefore, I consider that no additional regulatory action arising from this visit is necessary currently, and the interventions for Wylfa power station should continue to be implemented as set out in the IIS.