Office for Nuclear Regulation

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Control of Radiation Exposure (CORE) inspection at Hunterston B

Executive summary

Purpose of intervention

This report describes an inspection of the EDF Hunterston B Power Station, undertaken as part of the planned ONR cross sites intervention, which is looking at Control of Radiation Exposure (CORE) across all GB nuclear sites.

Interventions Carried Out by ONR

The intervention was conducted principally under regulation 8, ‘Restriction of Exposure’, of the Ionising Radiations Regulations 1999. To ensure consistency with previous inspections at other nuclear sites, the inspection was conducted using a standard questionnaire and follow up face-to-face question and answer session with representatives at Hunterston B. During the intervention a number of areas on site were inspected, to provide assurance that the arrangements are being applied at the point of work, including the gas circulator hall, Chargehall and Irradiated Fuel Dismantling cell control room.   

Explanation of Judgement if Safety System Not Judged to be Adequate

This intervention did not include a safety system based inspection.

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

Compliance with the requirements of the IRR99 was judged overall to be adequate. ONR noted that in relation to the control of occupational radiation exposure, Hunterston is performing at a similar standard to other reactors within the Fleet and that EDF is effectively leading the industry in the standards it adopts.  

ONR advised on a number of areas for improvement in order to achieve a better alignment with relevant good practice. These include:

A more detailed set of ratings for each of the eight CORE criterions is also presented in this report.

Conclusion of Intervention

In conclusion, it was considered that a Green IIS rating was appropriate for the CORE inspection with some opportunities for further improvement identified which were discussed and agreed with the licensee.