Office for Nuclear Regulation

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Dungeness B - Reactor Outage - LC5 and LC32 Inspections

Executive summary

Purpose of Intervention

This intervention report is on an inspection undertaken at Dungeness B power station (DNB) in relation to the 2017 statutory outage of reactor Unit 21.  It was conducted as part of a series of planned ONR interventions related to the DNB statutory outage.

The inspection was a joint intervention by ONR Radiological Protection and Nuclear Liabilities Regulation Specialists and the Environment Agency (EA).

The aim of this joint specialism intervention was to:

Our conclusions on these matters informed the development of our overall opinion of the Licensee’s readiness to bring reactor Unit 21 back to power in due course.

Interventions Carried Out by ONR

The following matters were addressed during the intervention:

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 inspection was undertaken.

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

In respect to the Ionising Radiation Regulations compliance inspection, this did not reveal any significant nuclear safety issues relevant to the reactor Unit 21 outage that required action by the Licensee or follow-up by ONR.  An inspection rating of Green was therefore assigned.

In respect to Licence Condition 5 compliance inspection, the documentation related to the consignment of waste despatched off-site on the day of the inspection was sampled.  The records had been completed and appeared clear, legible and consistent with the Site’s arrangements.  Based on the evidence sampled, an ONR inspection rating of Green, was therefore considered appropriate.

In respect to Licence Condition 32, some progress against the improvement plan to address an ONR regulatory issue has been made, a number of actions which were planned to be closed out by this time are still on-going.  Whilst it is recognised that plans are in place to address the shortfalls and close-out the regulatory issue, progress against this plan is behind schedule therefore an inspection rating of Amber was consider appropriate given the limited progress by the licensee.  The licensee has committed to provide an update on its progress against its improvement plan by October 2017.    

Conclusion of Intervention

From a radiological protection and control of radioactive wastes standpoints, we are content with the Licensee’s conduct of its statutory outage work programme and with its level of compliance with IRR99 and licence condition 5.  

In relation to compliance with LC32, limited progress against the improvement plan to address the shortfalls identified by the regulatory issue has been made. The Licensee’s progress to complete the improvement plan and close-out the regulatory issue will be followed up in October.

On the basis of this inspection of the IRR99 and radioactive waste management aspects of the Unit 21 outage, it is recommended that support be given for Consent under licence condition 30 to allow Unit 21 at the Station to return to normal operating service.