Office for Nuclear Regulation

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Dungeness B - Control of Occupational Radiation Exposure Project Intervention

Executive summary

Purpose of intervention

This report describes an inspection of the EDF Dungeness 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.

Additional to the CORE inspection was an inspection of the procedures and records associate with sealed source leakage testing and record keeping; Ionising Radiations Regulations 1999 (IRR99) regulations 27(3) and 28.

Interventions Carried Out by ONR

The intervention was conducted principally under IRR99 regulation 8, ‘Restriction of Exposure’.  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 Dungeness B. During the intervention we inspected the arrangements for controlling radiation exposure by inspecting a number of areas including the pile caps, Nitrogen Vapouriser 21 plant, Main Radiation Controlled Area (RCA) Personal Monitoring station, Contamination area level C2 Sub-change barriers, X-Ray Radiography cell, the walkway within Annulus, Neutron Scatter Plug (NSP) Recovery Facility Cell, and the Decontamination Yard.

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 ‘green’ - No Issues. ONR noted that in relation to the control of occupational radiation exposure, Dungeness B 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 are:

The Station needs to carry out a review of the process for ensuring that Radiological Work Permits (RWPs) are suitable and sufficient, each has a robust and proportionate review period, that appropriate review history information is recorded, and that expiry dates are appropriate.  A Level 4 issue has been raised to monitor progress.

The Station should review the provision of Radiation Protection Supervisors (RPSs) in relation to identifying the minimum number of RPSs required per area of work, ensuring that all Team Leaders are up to date in their RPS initial and refresher training, and the names of RPSs are available to employees as per IRR99 regulation 17(4).

Whilst leakage testing and source record keeping procedures appear compliant, the electronic source record documentation appeared to require improvement and the Station should ensure that the records contain accurate, statutory information and where practicable relevant additional information.

The Station are encouraged to dispose of waste sources as soon as practicable.

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

Conclusion of Intervention

In conclusion, it was considered that a Green (Integrated Inspection Strategy) IIS rating was appropriate for the CORE inspection. Examples of exemplar practice were identified. Some opportunities for further improvement were identified which were discussed and agreed with the licensee.