Office for Nuclear Regulation

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Hinkley Point B - SBI17 Gas Circulators

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 Division (OFD) 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 undertook a System Based Inspection (SBI) on the gas circulators, supported by an ONR Mechanical Engineering specialist Inspector.

In addition to the SBI, the nominated Site Inspector also:

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

From this inspection, I judge that the gas circulators met the requirements of the safety case.

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

From the system based inspection on gas circulators, I concluded that:

Conclusion of Intervention

After considering the evidence presented against, LC23, 24, 27, 28 and 34, I concluded that the licensee complied with its legal duties regarding the gas circulator systems inspected and met the requirements of the safety case and in line with ONR’s Inspection Rating Guide, a rating of Green has been assigned

However in relation to compliance against LC10, I judged that an IIS rating of Amber was proportionate based on the sample observed on the day.

There are no findings from this inspection that could significantly undermine nuclear safety.