Office for Nuclear Regulation

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Sizewell B - SBI03 and 06 - Mid Cycle Review

Executive summary

Purpose of intervention

The main purpose of this intervention was to undertake a system based inspection (SBI) at EdF Energy Nuclear Generation Ltd's (EdF NGL) Sizewell B (SZB) power station. The system inspected combined system 03 - Reactor Coolant System - RCS (System BB) and system 06 - Emergency Boration System - EBS (System BR). The inspection was conducted in line with the inspection programme contained in the SZB SBI plan for 2016/17.

Interventions Carried Out by ONR

The ONR Site Inspector and two specialist inspectors, referred to as "we" within this report, conducted a SBI of System 03 and 06 (RCS and EBS) at SZB nuclear power station. Through examination of this system, we performed compliance inspections against the following licence conditions of the Nuclear Site Licence i.e. LC 10: Training; LC23: Operating Rules; LC24: Operating Instructions; LC27: Safety Mechanisms, Devices and Circuits; LC28: Examination, Inspection, Maintenance and Testing and LC34: Leakage and Escape of Radioactive Material. The inspection was based on sampling the implementation of the arrangements in place at the station against each licence condition.

During this intervention the Site Inspector also continued hand over to the succeeding Site Inspector, with a Mid-Cycle Review also undertaken.

Explanation of Judgement if Safety System Not Judged to be Adequate

From the inspection we judged that overall the RCS and EBS system met the requirements of the safety case and are adequate.

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

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

After considering all the evidence examined during the inspection, we considered that the Reactor Coolant System and Emergency Boration System met the requirements of the safety case.

From the information gathered and evidence obtained during this intervention a minor area for improvement was raised with the licensee in regards to training, which is covered by the current ONR fleet wide level 3 issue. However, no matters were 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 SZB power station, set out in the integrated intervention strategy, should continue to be implemented as planned.