Office for Nuclear Regulation

Early Outage Review - Control and Supervision

Executive summary

Purpose of Intervention

The purpose of this intervention was to undertake a compliance inspection at the EDF Energy Nuclear Generation Ltd (NGL) Heysham 2 Power Station. The compliance inspection concerned nuclear site licence condition (LC) 26, control and supervision. We checked the arrangements in place at Heysham 2 for Reactor 8 (R8) outage; in particularly we examined the work area standards, work place practices and inspected the control and supervision arrangements. 

The intervention was planned in accordance with ONR’s Heysham 2 Integrated Intervention Strategy (IIS) for 2019/20.

Interventions Carried Out by ONR

The project inspector for Heysham 2 R8 outage and I, the nominated Heysham 2 site inspector, joined the NGL internal nuclear assurance regulator on their early outage review (EOR) team inspection and in addition carried out an unannounced inspection of the effectiveness of the control and supervision arrangements out of hours. 

The early outage review looked at work area standards and working practices. The unannounced inspection tested the effectiveness of the control and supervision arrangements out of hours. 

The intervention was performed in line with ONR's guidance requirements (as described in our technical inspection guides) in the areas inspected.

Explanation of Judgement if Safety System Not Judged to be Adequate

A system-based inspection was not performed.

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

Overall the EOR found no significant issues, although it concluded that the station management need to be aware of the possibility of behavioural drift over the next few days / weeks. In general all the staff seen were happy to engage with the team.

During the unannounced out of hour’s control and supervision inspection we spoke to a number of contract personnel from a variety of companies who were performing outage work. All had a reasonable understanding of the station’s, ‘do your 5 a day,’ message consisting of time out for personal safety, procedural use and adherence, pre-job briefs, work area standards and peep to peer coaching. No unsafe practices were seen and the personnel all had a good awareness of their supervisor and knew what you do in an emergency or accident.


The findings of this intervention were communicated verbally to Heysham 2 management on the night and the following day. I rated the intervention ‘GREEN’ with respect to the out of hours LC26 – control and supervision inspection.

There were no findings from this inspection that could significantly undermine nuclear safety.  At present, no additional regulatory action is needed over and above the planned interventions at Heysham 2 power station as set out in the 2019/20 Integrated Intervention Strategy.