Office for Nuclear Regulation

Licence Condition Compliance Inspection of LCs 11, 22 and 23

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 conditions:

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 attendance at the Sizewell Stakeholder Group meeting.

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

A team of ONR inspectors observed an exercise of the site’s emergency arrangements for dealing with any accident or emergency arising on the site and their effects.  The exercise scenario, presented an appropriate challenge to the sites’ emergency arrangements and the incident was brought under control in a reasonable timescale.  A number of good points and areas for improvement were identified by ONR and through the licensee’s exercise assessment. These will be taken forward through the emergency arrangements improvement programme.  The ONR assessment team considered the exercise to be an adequate demonstration of Sizewell B’s emergency arrangements under LC11.

The Licensee has well defined arrangements for supporting modifications on existing plant through the engineering change (EC) process.  The station has some areas of good practice for EC management which includes the training department’s quarterly EC review meeting and major project training requirements workshop.  From the evidence sampled and discussion with station personnel, I consider that the arrangements for compliance with LC22 are adequate, with no regulatory issues being raised.

The limits and conditions necessary in the interests of safety have been derived from the Sizewell B safety case and are reflected in the station procedures, primarily through Technical Specifications (TS), to provide the means by which the significant limits and conditions are implemented in accordance with LC 23.  The station has some areas of good practice for operating rules such as explicit review of international operating experience during the periodic and systematic review of safety cases through Licence Condition 15.  I consider that the arrangements sampled for compliance with LC23 are adequate, with no regulatory issues being raised.

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.