Office for Nuclear Regulation

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Planned intervention at Magnox Ltd's Wylfa licensed site, undertaken as part of a series of planned interventions outlined in the ONR integrated Strategy (IIS) Plan Wylfa Power Station 2015/2016

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 2015/2016.

Interventions Carried Out by ONR

Planned compliance inspection of Licence Conditions 32 and 34 was carried out as part of a joint regulatory intervention with the Environment Agency and Magnox Ltd internal site inspector. This inspection included a reactive inspection of compliance with Licence Condition 4(2) in relation to the storage of nuclear matter following the issue of an enforcement letter on this topic in May 2015.

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

No safety system based inspections were undertaken during this intervention.

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

Radioactive Waste Management Inspection

Inspection of the 69’ Level waste transit store confirmed that significant improvements had been made in response to the recent ONR enforcement letter. A number of improvements are still being undertaken and the Wylfa Waste Manager confirmed that he would write to ONR confirming status of any outstanding improvements at the end of July 2015.

A review of the actions, and supporting inspections, arising from inspections undertaken by ONR in 2013 confirmed that the majority of these have been adequately addressed. A few remain to be completed and these will be reviewed with ONR radioactive waste specialists to determine whether any further advice is necessary to ensure timely closure.

The inspection confirmed that assessment of the consolidated radioactive waste safety case by ONR/EA would be beneficial. The outcome of this assessment and the review of findings from this inspection, will be communicated by ONR and EA in written advice to Magnox Ltd suggesting areas for consideration to enhance current arrangements to ensure that they are robust for future operational phases (defueling/care and maintenance preparations) and sufficient to meet regulatory expectations at that time.

In conclusion, there are no fundamental concerns regarding relevant arrangements and subsequent implementation for the current phase of operation and initial stages of defueling operations. Consequently compliance with licence conditions 4(2), 32 and 34 are judged to be adequate and IIS ratings of 3 are assigned.

Other Interactions on Site

The site visit by the Programme Director for ONR’s DF&W programme  was valuable for him to see the scope of operations facing Magnox Ltd at Wylfa while Reactor 1 completes its final period of generation and the site transitions into defueling. It was reassuring to hear that managers and supervisors always respect safety challenge by staff and ONR commends Wylfa staff in establishing a healthy safety culture that respects challenge and promotes learning that is vital to effective safety improvement.

The 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

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.