Office for Nuclear Regulation

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To conduct a system inspection, a LC32 compliance inspection and undertake routine regulatory interactions with Sellafield Limited

Executive summary

Purpose of intervention

This intervention was undertaken on 17 – 20 November 2014 at Sellafield Limited’s Sellafield nuclear licensed site in Cumbria.

Inspection of Licence Condition (LC) compliance at nuclear licensed sites forms a significant part of ONR’s activities.  ONR’s Sellafield Programme has defined a programme of system inspections and LC compliance inspections to be undertaken on the Sellafield site, this is a key aspect of ONR’s regulatory strategy for the Sellafield site.  Undertaking this intervention is consistent with this strategy, and is identified on ONR’s PP4 inspection plan which covers Sellafield Limited’s Magnox Operating Unit.

Interventions Carried Out by ONR

The intervention comprised:

The safety significant role of the ventilation system within the Magnox Reprocessing Plant is to protect plant operators, the public and the environment by maintaining nuclear containment and limiting the spread of radioactive contamination.  The system inspection sought to determine whether the ventilation system meets the requirements of the safety case and is adequate.  The implementation of the licensee’s arrangements for the following LCs were tested during the system inspection:

LC32 requires the licensee to make and implement adequate arrangements for minimising, so far as is reasonably practicable, the rate of production of, and total quantity of radioactive waste accumulated on the site at any time and for recording the waste so accumulated.  Undertaking this LC32 compliance inspection is proportionate because there is a considerable volume of radioactive waste (radwaste) interim-stored in the graphite waste store associated the Fuel Handling Plant.  The inspection sought to determine whether the accumulation of radwaste within the Fuel Handling Plant was compliant with the requirements of LC32.

Explanation of Judgement if Safety System Not Judged to be Adequate

N/A.  Based on sampling inspection, the ventilation system of the Magnox Reprocessing Plant was judged to be adequate.

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

For the ventilation system of the Magnox Reprocessing Plant I judged the following IIS ratings to be appropriate:

Conclusion of Intervention

One minor issue was raised as a result of this intervention, relating to how SL is managing its filters.  I will manage its close out as part of normal regulatory interactions with the licensee. Based on the evidence gathered, no significant matters have been identified that are likely to impact on nuclear safety on the Sellafield site at this time.