Office for Nuclear Regulation

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Sizewell B Power Station - Licence Condition Compliance Inspection of LC2 and LC11

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 for 2016/17.

Interventions Carried Out by ONR

As part of this intervention a team of six ONR inspectors observed exercise 'Scafell', the site's level 1 emergency exercise. The nominated site inspector, the ONR security inspector and a project inspector (herein, I) also conducted a licence condition compliance inspection. Compliance inspections were carried out 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.

Explanation of Judgement if Safety System Not Judged to be Adequate

No system based inspection was undertaken, hence not applicable to this intervention.

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

I judged, from the evidence presented that the site arrangements for compliance with LC 2 are adequate. The inspection primarily focussed on the licensee's arrangements for compliance with LC 2(1) and LC 2(4), covering prevention of unauthorised entry onto site, and marking of the properly maintained licensed site boundary by fences or other appropriate means. A sample of the implementation of the licensee's arrangements was carried out which included walking parts of the site boundary, inspection of boundary signage and reviewing the site security arrangements and documentation. I noted during the site boundary walk-round that a small number of signs were either incorrectly located or obscured from site due to foliage growth. These minor issues were accepted by site with corresponding action requests to deal with them; an ONR issue was raised to track rectification. I judged that an inspection rating of Green was appropriate, on the basis that relevant good practice was generally met and identified deficiencies in compliance arrangements were relatively minor.

The scenario for the level 1 demonstration exercise had been previously agreed with ONR. The exercise scenario was an appropriately challenging test of the site arrangements and the incident was dealt with and brought under control within a suitable timescale. A number of good points and areas for improvement were identified by ONR as well as through the licensee's own exercise assessment. These will be taken forward through the site's emergency arrangements improvement programme. The ONR assessment team considered the demonstration exercise of Sizewell B's emergency arrangements, in support of LC 11, to be of a good standard and gave it an inspection rating of Green as relevant good practice was met.

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 I 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.