Office for Nuclear Regulation

Sizewell B - LC26 outage inspection

Executive summary

Purpose of Intervention

The purpose this intervention was to carry out a planned licence condition (LC) 26 (control and supervision of operations) inspection in accordance with the Sizewell B integrated intervention strategy (IIS) plan. While on site, I also had the opportunity to witness the outage-specific induction training and to follow that training up with outage personnel, and have used this as the basis for an unplanned LC 9 (instructions to persons on site) inspection. 

Interventions Carried Out by ONR

During an outage, the plant configuration is very different from normal operation. I considered the processes by which the Shift Manager, as duly authorised person (DAP), maintains control of the plant configuration through the use of minimum essential equipment lists and protected trains of equipment, and by authorising mode changes. I also inspected the control and supervision of outage personnel in containment and around the site more generally.

I also undertook the outage-specific induction training, and followed up some of the key messages from the training with outage personnel to test whether those messages had been received and understood.

Explanation of Judgement if Safety System Not Judged to be Adequate


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

I inspected a number of work fronts, both inside and outside of containment. I spoke to outage workers and supervisors, and the Shift Manager, and sampled the licensee’s procedures and operational documentation for control and supervision and for outage training. Overall, in the areas sampled I consider:

Conclusion of Intervention

Overall, I consider that the licensee is able to demonstrate compliance in the areas inspected.  Therefore, no urgent regulatory action is needed and no change to the planned intervention strategy for Sizewell B is required.