Office for Nuclear Regulation

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B205 System Inspection 'Steam' and Routine Interactions

Executive summary

Purpose of intervention

This intervention was undertaken on 22 – 25 September 2014 at Sellafield Limited’s Sellafield nuclear licensed site in Cumbria.

Inspection of Licence Condition (LC) compliance at nuclear licensed sites is an important aspect 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 that focuses on the aspects of SL’s operations that are most important to safety.  The present system inspection, identified on ONR’s PP4 inspection plan which covers Sellafield Limited’s Magnox Operating Unit, is part of that programme.

Interventions Carried Out by ONR

The intervention comprised:

The safety significant use of steam within the Magnox Reprocessing Plant is to provide the motive force for steam ejectors to move nuclear materials between plant vessels.  The system inspection sought to determine whether the Magnox Reprocessing Plant steam ejector system meets the requirements of the safety case and is adequate.  The implementation of the licensee’s arrangements for the following LCs was tested during the system inspection:

Explanation of Judgement if Safety System Not Judged to be Adequate

Based on sampling inspection, the steam system of the Magnox Reprocessing Plant was judged to be adequate.

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

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

Based on this sample inspection, I judged that the operation of the steam system is consistent with safety case requirements, the key equipment that verifies this is available and appropriately maintained, those responsible for operations are suitably trained and that appropriate written instructions are available.  I conclude the steam system meets the requirements of the safety case.

Conclusion of the intervention

Three actions were placed as a result of this intervention, I will manage their 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.