Office for Nuclear Regulation

This website uses non-intrusive cookies to improve your user experience. You can visit our cookie privacy page for more information.

Hinkley Point B - Planned intervention

Executive summary

Purpose of intervention

The purpose of this intervention was to conduct a system inspection of the Decay Store at Hinkley Point B power station and to exchange information with site personnel.

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

The following interventions were carried out:

The ONR specialist fuels inspector and I carried out an inspection of the Decay Store. This was based on sampling of the compliance arrangements that were in place, safety case requirements, operational limits, plant & training records, operational experience and a plant inspection. The intervention considered Licence Condition 12 (duly authorised and other suitably qualified and experienced persons), 23 (operating rules), 24 (operating instructions), 27 (safety mechanisms, devices and circuits), 28 (examination, inspection, maintenance and testing) and 34 (leakage and escape of radioactive material and radioactive waste).

I held a series of information exchange meetings with site personnel.

Explanation of judgement if safety system not judged to be adequate.

The safety system (Decay Store) was judged to meet the requirements of the safety case and was adequate.

Key findings, Inspector's opinions and reasons for judgements made

The ONR specialist fuels inspector and I carried out a system inspection on the Decay Store and concluded that:

Overall, we judged that the Decay Store Systems met the requirements of the safety case and were adequate.

Finally I held information exchange meetings with station staff on a range of topics including discussion of some fuel matters on site, an end of year conventional safety and security review, a review of the ONR issues database, progress with the interim outage, lift repairs, Reactor Cooling Water valve misalignment, progress with commissioning of the new Vaporiser Auxillary Boiler Plant and a meeting with the Nuclear Inspection and Oversight team on site.

The licence conditions were inspected against ONR's published guidance requirements (as described in our technical inspection guides).

Conclusion of intervention

There are no findings from this inspection that could significantly undermine nuclear safety. No actions were raised during this inspection.


The planned interventions set out in the Integrated Intervention Strategy for Hinkley Point B remain valid and will be followed for future inspections.