Office for Nuclear Regulation

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Sizewell B Power Station – Licence Condition Compliance Inspection of LC14, IAEA OSART mission and ONR board member visit

Executive summary

Purpose of intervention

The purpose of this intervention was to undertake licence condition (LC) compliance inspections at EDF Energy Nuclear Generation Limited (NGL) Sizewell B power station in line with the inspection programme contained in the Sizewell B integrated intervention strategy (IIS) for 2015/16.

Interventions Carried Out by ONR

As part of this intervention, I carried out a compliance inspection against licence condition LC 14: Safety documentation.  The inspection was based on sampling the implementation of the arrangements in place at the station against the licence condition and ONR inspection guidance.  This intervention report also records a number of regulatory information exchanges with the site and an ONR board member and the IAEA Operational Safety Review Team (OSART) mission.

Explanation of Judgement if Safety System Not Judged to be Adequate

Not applicable to this intervention.

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

The Licensee has defined primary implementation and secondary supporting documents for compliance with LC 14.  The station has some areas of good practice for safety case management which include nuclear safety operational review committee, for high category cases and independent nuclear assurance review.  From the evidence seen and the discussion held with station personnel, I consider that the arrangements sampled for compliance with LC14 are good; with no regulatory issues being raised.

The IAEA is undertaking an OSART mission at the station.  The mission is at week two of three and during this visit I met with the IAEA OSART team leader and assessors to discuss progress of the mission, initial findings and the regulators interface with the site.  The mission outlined the development of initial areas for suggested improvement and good practice.  The review is still progressing and these initial areas will be concluded and fed back at the end of visit, followed by a report.

An ONR board member visited the station, hosted by the plant manager and security manager.  A general presentation was provided of the site security arrangements and plant operation followed by a site tour and visit to the off-site emergency response centre.  The board member found the visit informative and supportive of ONR’s mission.

I had a general information exchange with the technical safety support manager.  I was provided with an update of the recent incident during commissioning of dry fuel store equipment.  The incident involved activation of a bursting disc on a helium line.  There were no immediate nuclear or radiological consequences however the station embargoed operation and started an investigation. I am satisfied with the initial actions and response taken by the station and will monitor developments under normal site intervention.

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 significant impact on nuclear safety on the station at this time. Therefore we consider that no additional regulatory action arising from this visit is necessary currently, and the interventions for Sizewell B power station, set out in the integrated intervention strategy, should continue to be implemented as planned.