Office for Nuclear Regulation

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Hinkley Point B (EDF Energy), Seawater Systems - Planned System Based Inspection (SBI 05)

Executive summary

Purpose of intervention

This was a planned inspection of EDF Energy Nuclear Generation Ltd's (NGL's) Hinkley Point B power station, undertaken as part of the planned intervention strategy for the Operating Facilities Programme (OFP) of the Office for Nuclear Regulation (ONR).

Interventions Carried Out by ONR

I (the nominated site inspector for Hinkley Point B) with support from the incoming nominated site inspector for Hinkley Point B and an ONR structural integrity specialist inspector:

The system based inspection of the reactor seawater systems was conducted against compliance with the following licence conditions:

The intervention was performed in line with ONR's guidance requirements (as described in our technical inspection guides) in the areas inspected.

The intervention was performed in line with ONR's guidance requirements (as described in our technical inspection guides, which can be found at ( in the areas inspected.

Explanation of Judgement if Safety System Not Judged to be Adequate

Based on the inspection of the selected sample, we judged that the reactor seawater system met the requirements of the safety case and was adequate.

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

From the System Based Inspection on the seawater system, we concluded that:

The system based inspection requires an assessment of the plant condition, which was based on discussions with the System Engineer and a walk down of the plant. The systems reflected the state of the plant described by the System Engineer, with areas of positive operational experience demonstrated. Overall the plant condition was judged to be acceptable.

To support the handover of site inspection duties (of the nominated site inspector), we held discussions with senior management, Independent Nuclear Assurance, visited a number of plant areas including the Emergency Control Centre (whilst a shift training exercise was ongoing).

Conclusion of Intervention

There were no findings from this inspection that could significantly undermine nuclear safety. At present, no additional regulatory action is needed over and above the planned interventions of Hinkley Point B power station as set out in the integrated intervention strategy, which will continue as planned.