Office for Nuclear Regulation

Hinkley Point B site 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 Civil Nuclear Reactor Programme (CNRP) 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 an Electrical Technical Specialist from AMEC Foster Wheeler carried out a System Based Inspection (SBI) on No‑break electrical supplies.  I subsequently:

Explanation of Judgement if Safety System Not Judged to be Adequate

Not applicable – the system was judged to be adequate.

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

From the system based inspection on the No-break electrical supplies we concluded that:

Overall, we concluded that the arrangements and their implementation on the No‑break electrical supplies met the requirements of the safety case and were deemed to be adequate.

I (the nominated site inspector) carried out the following inspections:

For licence condition 25 (operational records) - I was satisfied that site had developed adequate procedures and facilities for the making and retention of records relating to operations on the site.  I therefore assigned an IIS rating of 3, (adequate) to this inspection.

I met with the Independent Nuclear Assurance (INA) Inspector on site to review recent events including proposed changes to INA representation on site, ONR inspection plans and outcomes, fuel route improvements, decommissioning plans, radioactive transport matters, the recent reactor 3 trip and emergent issues on the site.  I intend to meet routinely with INA when I am on site.

I was satisfied with the information exchanged during meetings with NGL staff on a range of topics including the recent trip of Reactor 3 and a variety of permissioning activities relating to a number of safety enhancements (eg new Nitrogen plant, kerosene storage tanks, Reactor 3 operational period, Boiler Tube Failure Safety Case, and boiler inspections.  I also discussed progress with the third Periodic Safety Review which was on course to be delivered at the end of the year.

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.