Office for Nuclear Regulation

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Compliance Inspection of Licence Condition 7 at the Magnox Swarf Storage Silo (MSSS) within the Decommissioning Directorate at Sellafield

Executive summary

Purpose of Intervention

The Office for Nuclear Regulation (ONR) undertakes all regulatory interaction with the Sellafield site licensee (Sellafield Limited (SL)) against a strategy defined by the ONR Sellafield, Decommissioning, Fuel and Waste Division.  In accordance with that Strategy, a Licence Condition compliance inspection of the Decommissioning Directorate was carried out as identified within the planned inspection schedule for Decommissioning.

This planned intervention was undertaken to determine if the MSSS facility is adequately implementing SL’s site-wide arrangements for compliance with Licence Condition 7 (LC7) (Incidents on the site). The MSSS facility was chosen because of the radiological hazard associated with the waste inventory and because the facility is preparing to conduct waste retrieval operations.

Interventions Carried Out by ONR

LC7 requires SL to make and implement adequate arrangements for the notification, recording, investigation and reporting of such incidents occurring on the site.

I carried out a one-day, on-site, licence condition compliance inspection of the MSSS against the requirements of LC 7, accompanied by the ONR nominated site inspector and the ONR Chief Executive Officer (as an observer).

The inspection comprised discussions with SL staff and examination of a sample of plant operational and administrative records. The inspection was carried out in accordance with the following formal ONR inspection and assessment guidance:

Explanation of Judgement if Safety System Not Judged to be Adequate

N/A; this was not a System Based Inspection (SBI).

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

I observed a number of good practices associated with the implementation of SL’s compliance arrangements in MSSS; such as the production of ‘grab packs’ to train staff and reinforce compliance with SL’s LC7 arrangements; the development and use of a Performance Improvement (PI) Dashboard for MSSS to assist its managers in improving the facility’s PI performance; and the use of relevant onsite and offsite operational experience. I also noted a number of minor shortfalls. These included an incomplete training record, some overdue corrective actions, one of which was significant, and a below standard quality Basic Cause Investigation (BCI) report. I have generated regulatory issues here to track the timely completion of the actions required to address these shortfalls.  Notwithstanding these observations, on balance, from the evidence sampled during this inspection, I consider that SL has effectively implemented its arrangements for compliance with LC 7, and I have therefore assigned an inspection rating of Green (No formal action).

Conclusion of Intervention

My findings were shared with, and accepted by SL, as part of routine inspection feedback.  I have raised three minor Regulatory Issues as a result of this inspection, to ensure the identified shortfalls are effectively remedied.