Office for Nuclear Regulation

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Wylfa - Planned IIS Inspections

Executive summary

Purpose of intervention

This report covers the nuclear safety related inspection of Wylfa power station undertaken as part of a series of interventions including those listed in the Integrated Intervention Strategy (IIS) plan, inspections deemed necessary to cover emergent work, and follow-up of matters carried forward from previous visits.

Interventions Carried Out by ONR

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

Other matters of a routine nature that are deemed unlikely to have a significant effect on nuclear safety, and which are being addressed routinely under the licensee's arrangements, were also covered during the inspections.

Explanation of Judgement if Safety System Not Judged to be Adequate

No system based inspections were conducted during this intervention visit.

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

An inspection was carried out of the arrangements, and their implementation, to comply with LC 36 concerning organisational capability to ensure safe operation of the site. During the inspection a sample of the site licence compliance arrangements documents for LC36 were examined, and while the primary implementation documents are covered by the arrangements it was agreed that they would include more information on the supporting documents within their site licence compliance arrangements. The station also reported that they are working to update aspects of the arrangements that have been affected by changes to the company structure, with the assistance of the Magnox Ltd support centre. On the basis of the areas sampled during the inspection, and the progress made so far to update the current arrangements, I have given this component of my inspection a rating 3 (adequate).

An inspection was carried out of the arrangements to comply with LCs12&26 relating to suitably qualified and experienced persons (SQEP), duly authorised persons, and controlling and supervising persons at Wylfa power station. The inspection confirmed that station is taking steps to improve the extant local arrangements and their implementation. However, further effort is needed to ensure that the status of SQEP training requirements is correctly recorded and visible to staff using the company system, and they have agreed to make improvements in this area. While work remains to embed the system within the station arrangements, the measures in place overall for these licence conditions, together with the station commitment to continue to improve the arrangements, has led me to give an inspection rating 3 (adequate).

Station notified ONR of an event under the arrangements for LC7, where it was necessary for them to respond to circumstances affecting compliance with established arrangements. The event related to them becoming aware that the formal authorisations for some staff performing a role within the site emergency arrangements had lapsed. The matter came to light when they carried out a check of the records they were using, recognised an inconsistency, and took prompt steps to correct a non-compliance. They ensured that the staff member on-duty was correctly authorised and arranged for those whose authorisation had lapsed to receive the training necessary to permit re-authorisation. They are continuing to investigate this matter to help prevent a re-occurrence. While the licensee's response to the incident was appropriate under LC7, the event involved a non-compliance with the station arrangements to ensure that staff are properly authorised for the roles they perform. Therefore, I have given an inspection rating 4 (below standard) to this component of my inspection.

During the intervention visit, opportunity was taken to inspect station's response to incidents on the site, including those notified to ONR, and I consider that the inspections conducted confirm that they have responded adequately to emergent plant conditions. On the basis of the sample inspections, I judge that they have complied with licence condition arrangements in relation to emergent work, which has arisen since the previous inspection visit and is not covered separately in this report; hence I consider their response to this aspect of my inspection is adequate.

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 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 Integrated Intervention Strategy. I judge the corrective action taken by station in response to emergent matters to be appropriate in the prevailing circumstances. The outcome from the inspections has been captured within the station event and action tracking arrangements, in the actions recorded in this intervention report, and in the ONR issues database, as appropriate.