Office for Nuclear Regulation

Sizewell B – Dry Fuel Store Safety Case Submission 1

Executive summary

Purpose of intervention

This joint Office for Nuclear Regulation (ONR) and Environment Agency (EA) inspection was carried out to support ONR’s permissioning of the Sizewell B Dry Fuel Store Safety Case NP/SC 7575, SS1 Rev 1, EC 338509.

Interventions Carried Out by ONR

This inspection targeted EDF Energy’s radioactive waste and decommissioning arrangements for dry storage of fuel and was focussed on the selection of records and their management throughout the life of the dry fuel store.

The inspection built on ONR’s assessment work undertaken on SS1, Rev 1 and addressed the following Licence Conditions (LC):

Explanation of Judgement if Safety System Not Judged to be Adequate

This was not a planned Safety System Inspection and so no judgement was made.

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

The inspection had a positive outcome with NGL clearly demonstrating a structured and methodical approach to recording and retaining data and information for dry fuel store activities. The evidence provided and confidence given, through explanation of the radioactive waste and decommissioning arrangements, met the expectations set out in ONR guidance.

Data and Information recording specification for the dry fuel store has not been finalised and the system to manage dry fuel store records is still developing. These arrangements are expected to be in place for active commissioning, with the draft document and planned systems considered adequate.

All of the five LCs inspected against were rated as ‘adequate’ given that the evidence presented by EDF Energy was judged to suitable and sufficient based on Station’s arrangements and ONR’s guidance.

Conclusion of Intervention

Overall, this inspection provided the ONR specialist inspector with evidence to support ONR’s assessment of dry fuel store radioactive waste and decommissioning arrangements as being implemented to the required standard.


No recommendations were identified from this inspection.