Office for Nuclear Regulation

Intervention on Control of Occupational Radiation Exposure - IRR99 regulation 8

Executive summary

Purpose of intervention

The intervention was undertaken as part of ONR’s Control of Occupational Radiation Exposure (CORE) project, which assesses compliance with IRR99 regulation 8, which is concerned with the restriction of exposure to ionising radiations so far as is reasonably practicable (SFAIRP).

The standard CORE questionnaire was submitted to, and completed by, the Licensee prior to the site visit.  We then discussed the adequacy of the arrangements described in the response with the Licensee and conducted a plant visit to determine whether these arrangements were being effectively applied at the point of work.

An overall rating for the adequacy of the arrangements is presented within this intervention record, and a more detailed set of ratings for each of the CORE criterion will be presented in a separate CORE assessment report.

Explanation of Judgement if Safety System Not Judged to be Adequate

This intervention did not include a safety system inspection.

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

The Licensee provided its response to the CORE questionnaire prior to the site visit which we reviewed and discussed with the Licensee upon arrival.  We explored the arrangements for restricting worker exposure to ionising radiation at Sizewell B and were provided with sufficient supporting evidence to assess the effectiveness of the Site’s arrangements for compliance with the requirements of IRR99 regulation 8. 

We considered the arrangements for restricting the exposure of workers to ionising radiation at Sizewell B are of a good standard.  The Licensee has mature, effective arrangements in place for planning radiologically significant work and for monitoring and trending worker doses and radiological incidents.  The Licensee also expends significant levels of effort in the identification of relevant good practice from reactor sites in the UK and overseas and provided examples of how this intelligence has been used to improve its own arrangements.

Several areas for improvement were identified and communicated to the Licensee.

Conclusion of Intervention

We consider that the Licensee is complying with IRR99 regulation 8 to restrict operational exposure SFAIRP, and that it demonstrated several areas of good practice, hence the overall rating of ‘good’.