Office for Nuclear Regulation

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Hinkley Point B - Level 1 demonstration exercise

Executive summary

Purpose of Intervention

The purpose of this intervention was to undertake compliance inspections of EDF Energy Nuclear Generation Ltd.’s (NGL’s) Hinkley Point B Power Station. This was undertaken as part of the planned intervention strategy for the Operating Facilities Division (OFD) of the Office for Nuclear Regulation (ONR).

Interventions Carried Out by ONR

We observed the station’s annual level 1 emergency exercise designed to demonstrate Hinkley Point B capability to deal effectively with any accident or emergency arising on site.

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

Explanation of Judgement if Safety System Not Judged to be Adequate

Not applicable – no system based inspections were completed during this intervention.

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

The exercise scenario involved a large fuel spill from a delivery tanker causing a fire, which has a potential threat to nuclear safety due to the proximity to safety related equipment. The scenario included a significant amount of casualties at different locations and with different injuries. In addition, the scenario involved a failure of the electronic muster system and the loss of the control room supervisor part way through the exercise due to illness.

We judged that in a real event the station would have coped with the incidents; consequently we concluded that the exercise had been an adequate demonstration of the site’s emergency arrangements. Some observations were fed back to the licensee to consider.  We judged that overall the standard of compliance was generally consistent with recognised good practice and an inspection rating of ‘Green’ is appropriate.

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 IIS, which will continue as planned.