Office for Nuclear Regulation

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Sizewell B - Radiological Protection - Post-Commissioning Operational Inspection

Executive summary

Purpose of Intervention

This intervention report relates to an inspection undertaken at the Sizewell B Dry Fuel Store following the inaugural campaign to move fuel from the fuel storage pond to the facility. This inspection is the first of its kind on an operating dry fuel store for used fuel in the United Kingdom, and follows completion of Campaign No. 1 (February - June 2017) to load and transport the initial batch of 7 casks to the store.

The intervention addresses the recommendation in the ONR Radiological Protection assessment of Sizewell B Dry Fuel Store Safety Case prior to operations in 2016 which recommended that, subject to granting the approval for operation of the dry fuel store, a radiological protection specialist inspector undertake a inspection of the station's arrangements after active commissioning.

The aim of this intervention was to establish whether the Sizewell B Dry Fuel Store is being operated in compliance with the Ionising Radiations Regulations 1999. Relevant ONR guidance was used during the inspection, in particular, Nuclear Safety Technical Inspection Guide, NS-INSP-GD-054 Revision 4, The Ionising Radiations Regulations 1999.

Interventions Carried Out by ONR

The following matters were addressed during the intervention:

Explanation of Judgement if Safety System Not Judged to be Adequate

No safety system inspection was undertaken, hence this is not applicable.

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

My inspection did not reveal any significant radiological protection safety issues that required action by the Licensee or follow-up by ONR. My discussions with the Head of Radiological Protection at the Station and his team indicated their strong commitment to effective radiological protection practice and a good level of compliance with the IRR99 was evident during plant inspections; Accordingly, I have assigned an IIS rating of Green.

Conclusion of Intervention

From a radiological protection standpoint, I was content with the Licensee's arrangements for the operation of the Sizewell B Dry Fuel Store and with the level of compliance with the IRR99.