Office for Nuclear Regulation

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Dungeness B - LC32 and LC34 Compliance Inspections

Executive summary

Purpose of intervention

The purpose of this intervention was to undertake Licence Condition (LC) compliance inspections at EDF Energy Nuclear Generation Ltd’s (NGL’s) Dungeness B power station (DNB), in line with the planned inspection programme contained in the Dungeness B Integrated Intervention (IIS) plan for 2016/17.

Interventions Carried Out by ONR

This intervention was conducted in conjunction with the Environment Agency and included compliance inspections against the following licence conditions:

Explanation of Judgement if Safety System Not Judged to be Adequate

Not applicable as no system inspection was undertaken during this intervention.

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

I undertook a planned intervention against LC 32, during which I:

During the inspection of the decontamination centre I observed accumulations of waste which were not segregated or stored in line with RGP. This indicated shortfalls in the station’s ability to segregate and store waste to enable disposals to be carried out in a timely manner. DNB are aware of the issues raised and I was informed by DNB that it has plans in place to improve the situation.

I undertook a planned intervention against LC 34, during which I:

During the inspection I observed radioactive material being stored within engineered containment. I also confirmed that DNB has installed a means for detection of leakage and escape and these are being improved where necessary.  I also observed a section of the new final discharge route. This was an end-to-end replacement consisting of two independent secondary contained pipes.

The intervention was performed in line with ONR's guidance requirements (as described in our technical inspection guides) in the areas inspected.

Conclusion of Intervention

In relation to LC 32, I judged that an IIS rating of ‘Amber’ is warranted on the basis that there are unacceptable volumes of unprocessed low level waste and equipment stored, not clearly discernible from waste, within the decontamination centre. I am also of the opinion that housekeeping within the facility requires improvement, particularly with regards to how waste is being stored and labelled. In my opinion this represents a deficiency of the arrangements for compliance against LC32. An ONR regulatory issue has been raised to monitor improvements.

In relation to LC 34, I judged that the IIS rating of ‘Green’ is warranted on the basis that I have witnessed systems in place to contain and detect radioactive leaks as described in DNB’s arrangements.