Office for Nuclear Regulation

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Radiological Protection Pre-Outage Inspection and Start-up Consent Recommendation under Licence Condition 30

Executive summary

Purpose of Intervention

This intervention report relates to a Radiological Protection (RP) inspection undertaken at Sizewell B (SZB) power station prior to the 2017 refuelling outage scheduled to commence on 3rd November 2017. It was conducted as part of a series of planned ONR interventions related to the outage.The aim of this intervention was to establish whether EDF Energy, Nuclear Generation Ltd's (the Licensee), refuelling outage work programme for SZB was being conducted 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, and the Ionising Radiations Regulations 1999.Our conclusions on these matters informed the development of our overall opinion that the Licensee's RP arrangements for the forthcoming outage are adequate and will ensure readiness to bring the reactor back to power in due course.

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

The inspection did not reveal any significant nuclear safety issues that required action by the Licensee or follow-up by ONR. Our discussions with the Head of Radiological Protection at the Station indicated their strong commitment to effective radiological protection practice and planning for a good level of compliance with the IRR99 was evident; accordingly, we have assigned an IIS rating of Green.

Conclusion of Intervention

From a radiological protection standpoint, we are content with the Licensee's planning for its forthcoming refuelling outage work programme and with its level of compliance with the IRR99. At the current time we do not envisage issues that would prevent support of a Consent under licence condition 30 to allow the Station to return to normal operating service after the outage.