Office for Nuclear Regulation

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Sludge Packing Plant 1 (SPP1) Readiness Inspection – 21 October 2014, Sellafield - Additional Sludge Retrievals (ASR) Readiness Inspection – 22 Oct 2014, Integrated Test Facility, Forth Engineering, Maryport

Executive summary

Purpose of intervention

Due to delays in the First Generation Magnox Storage Pond (FGMSP) bulk sludge retrievals project, Sellafield Limited (SL) has instigated the Additional Sludge Retrievals (ASR) project (also known as Plan B) to allow active commissioning of the Sludge Packing Plant 1 (SPP1) in advance of bulk sludge retrievals commencing. The ASR project will pump sludge from the inlet sub-pond area of FGMSP to SPP1 for active commissioning.  

Operation of the ASR equipment and associated SPP1 active commissioning is subject to a regulatory hold point in the form of an engagement window. The purpose of this intervention was to undertake a readiness review of SPP1 and the ASR project in support of the Office for Nuclear Regulation (ONR) permissioning decision.

Interventions Carried Out by ONR

The SPP1 and ASR readiness reviews were undertaken on the 21st and 22nd October 2014 respectively. The SPP1 inspection was undertaken at Sellafield and included ONR human factors, process, security and control and instrumentation specialist inspectors. The ASR inspection was undertaken at the integrated test facility at Forth Engineering in Maryport and included ONR human factors and radiological protection specialist inspectors.

The readiness review inspections were undertaken against Licence Conditions (LC) 10 – Training; LC 12 – Duly authorised and other suitably qualified and experienced persons; LC 21 – Commissioning; and, LC 26 – Control and supervision of operations.

Explanation of Judgement if Safety System Not Judged to be Adequate


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

Based on the evidence sampled during this intervention, we judge the following ratings are appropriate:



Conclusion of Intervention

Based on the evidence sampled, we judge that SL’s commissioning strategy is adequate; however, it still needs to complete its specified programme of work on both SPP1 and the ASR project to be in a state of readiness to commence active commissioning.

To support the ONR engagement window decision, I have requested SL provide the following, when complete:

SL internal assurance readiness review reports including close out of actions