Office for Nuclear Regulation

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Wylfa - Planned Licence Condition compliance inspection and Defuel information gathering

Executive summary

Purpose of Intervention

This inspection was one of a series of planned inspections for 2019/20, which are informed by the ONR Decommissioning Fuel and Waste (DFW) sub-division strategy.  The inspections focused on aspects of the Site’s transition from defueling to care and maintenance (C&M) preparations.

Interventions Carried Out by ONR

This inspection examined the adequacy of Magnox Limited’s (ML) arrangements and their implementation on the Wylfa site for compliance with Licence Conditions (LC): LC7 (incidents on the site) and LC26 (control and supervision of operations). I also held meetings to discuss Wylfa’s transition programme, examined defueling records and conducted a site walk-down with employee safety representatives. 

For LC 7, I focused on the licensee’s arrangements to ensure that incidents are notified, recorded, investigated, reported and learning takes place.  For LC26, I focussed on the control and supervision of operations at Wylfa; this was with focus on the Wylfa transition from defueling to C&M preparations.  This is currently the subject of a Management of Change (MoC) proposal and is programmed to be completed in November 2019. 

The key activity for moving to C&M preparations at Wylfa is the completion of defueling and verification that the site is fuel free. Therefore, I inspected the process for fuel free verification and reviewed supporting documentation.

I met with licensee staff to discuss the site’s transition programme that will result in changed emergency arrangements and a revised organisational structure when all fuel has been removed from the site.  I discussed the cultural changes that will be required from the staff in the C&M preparations phase.

Explanation of Judgement if Safety System Not Judged to be Adequate

Not applicable.

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

Based on the evidence examined it is my judgement that ML is effectively implementing arrangements for complying with LC 7 and 26 at Wylfa.  I identified areas of good practice and some areas where ML could improve.

Conclusion of Intervention

I identified no matters that in my opinion could adversely affect nuclear safety. My findings were shared with and accepted by the licensee.