Office for Nuclear Regulation

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Sellafield - IRR17 Inspection of the Thermal Oxide Reprocessing Plant (THORP)

Executive summary

Purpose of Intervention

This report presents the findings of a planned intervention that was undertaken at the Sellafield nuclear licensed site in order to assess Sellafield Limited’s (SL) compliance with the Ionising Radiations Regulations 2017 (IRR17) within the Thermal Oxide Reprocessing Plant (THORP) and the Oxide Fuel Storage Group (OFSG) at Sellafield.  

The intervention also provided an opportunity for SL to outline the radiological protection preparations for THORP Post Operational Clean Out (POCO), with the focus of the rest of the intervention on OFSG activities.

The intervention was part of the six planned interventions across the Sellafield site examining the standard of radiological protection culture and practice across multiple operating units.

Interventions Carried Out by ONR

The intervention consisted of an examination of the implementation of arrangements to secure compliance with the requirements of IRR17 by discussion with key facility personnel and inspection of plant.  The key requirements examined were those relating to:

Explanation of Judgement if Safety System Not Judged to be Adequate

Not applicable, this was not a System Based Inspection.

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

Based on the work areas and work activities examined, I found that arrangements for the control of work with ionising radiations within OFSG were adequate.  In particular:

Conclusion of Intervention

From what I observed and examined, the arrangements for the control of work with ionising radiations and their implementation indicate that there are no significant shortfalls of compliance with the Ionising Radiations Regulations 2017 (IRR17) within OFSG.  I rated the interventions as Green (No Formal Action).  No matters that required a regulatory issue to be raised were identified during the intervention.