Office for Nuclear Regulation

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Hinkley Point B - Planned Intervention

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).

The work was carried out in-line with the planned inspection programme contained in the Hinkley Point B Integrated Intervention Strategy (IIS).

Interventions Carried Out by ONR

I (the nominated site inspector for Hinkley Point B) with support from ONR inspectors:

Explanation of Judgement if Safety System Not Judged to be Adequate

The Data Processing and Control System (station control and instrumentation) was judged to meet 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 DPCS we concluded that:

We carried out an inspection of DPCS plant and equipment and considered them to be in very good condition and well maintained. The housekeeping in the area was excellent.

After considering all of the evidence presented by NGL we concluded that the arrangements and their implementation, associated with the Data Processing and Control System met the requirements of the safety case and were adequate.

For LC2 (Marking of the Site Boundary) - We were satisfied that the site boundaries were adequately marked and that robust arrangements and facilities were in place to prevent unauthorised persons from inadvertently entering the site. We therefore assigned a rating of green (no formal action required) to this inspection.

I attended the Hinkley Point Site Stakeholder Group meeting. I was satisfied with the discussions and behaviours at the meeting which enabled me to interact with stakeholders and clarify ONR's regulatory activities.

I met with an INA evaluator on site to discuss a number of issues and promote effective working interactions. On this occasion we discussed the System Based Inspection that was carried out jointly by ONR and INA, staffing levels on the site and a number of safety initiatives that were being progressed.

Finally I held a number of information exchange meetings with station staff to gather information on the condition of the gas pressure relief valves, the recent manual shutdown of Reactor 4 due to voltage fluctuations on the turbine, the control of laptops on site and progress with arrangements for the next annual review of safety meeting.

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

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.