Office for Nuclear Regulation

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A planned inspection of LC 11 at Devonport Royal Dockyard Limited's licensed nuclear site

Executive summary

Purpose of Intervention

A planned inspection of LC 11 "Emergency Arrangements" was undertaken this was one of a series of planned interventions for the Devonport Royal Dockyard Limited (DRDL's) licensed nuclear site at Plymouth, in line with the strategy for regulating the site during 2017/18.

Interventions Carried Out by ONR

On 4 October 2017 a joint ONR / Defence Nuclear Safety Regulator (DNSR) team assessed the annual Level 1 on-site emergency exercise "Short Sermon 17". This emergency exercise was intended to demonstrate DRDL's arrangements, under Licence Condition 11 (LC11) and Authorisation Condition 11 (AC11) "emergency arrangements", for dealing with any accident or emergency arising on the site and their effects.

Explanation of Judgement if Safety System Not Judged to be Adequate

Not applicable.

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

We considered that DRDL's aims and objectives for the emergency exercise were appropriate and that a suitably challenging scenario had been defined. During its assessment of the emergency exercise, the team identified a number of good points and a number of points for improvement. These will be included in a joint DNSR/ ONR exercise assessment letter to DRDL. Taking into account the exercise scenario and all the team's exercise assessments we considered the exercise to be an adequate demonstration of the site's emergency arrangements.

However, the Licensee agreed to a partial re-demonstration of part of the scenario of a casualty being rescued and technical intervention into an area presenting a significant radiological challenge. Taking all these factors into account ONR applied a rating of Green to the LC11 demonstration exercise.

Conclusion of Intervention

From the evidence gathered during this intervention, no matters have been identified that are likely to have a significant impact on nuclear safety on the site at this time. However, the partial re-demonstration of part of the scenario of a casualty being rescued and technical intervention into an area presenting a significant radiological challenge will be carried out within the next 6 months which ONR will track to completion under a Regulatory Issue. Therefore, no further regulatory action arising from this visit is considered necessary.