Office for Nuclear Regulation

EDF Energy – Nuclear Generation Ltd – Hinkley Point B Planned Intervention

Executive summary

Purpose of intervention

This was a planned inspection of EDF Energy Nuclear Generation Ltd’s (NGL’s) Hinkley Point B power station, undertaken as part of the planned intervention strategy for the Civil Nuclear Reactor Programme (CNRP) of the Office for Nuclear Regulation (ONR).

The work was carried out in line with the planned inspection programme contained in the Hinkley Point B Integrated Intervention Strategy (IIS).

Interventions Carried Out by ONR

I (the nominated site inspector for Hinkley Point B) with an inspection team from NGL’s Independent Nuclear Assurance (INA) carried out a System Based Inspection (SBI) on the Heating and Ventilation (H&V) systems, specifically the Central Control Room (CCR) ventilation system and the Contaminated Ventilation Extract System (CVES).

I also discussed progress with the new diverse shutdown and hold down system with station staff.

Explanation of Judgement if Safety System Not Judged to be Adequate

This system based inspection judged that the arrangements and their implementation, associated with H&V system, met the requirements of the safety case and are deemed adequate.

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

From the system based inspection on the H&V system I concluded that:

Overall, I concluded that the arrangements and their implementation on the H&V systems met the requirements of the safety case and were deemed to be adequate.

I discussed progress with the new diverse shutdown and hold down systems on site and was pleased to note that the new Nitrogen hold down system had now entered full operation and that 21 out of 24 of the Super Articulated Control Rods had been loaded.

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

Conclusion of Intervention

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 of Hinkley Point B power station as set out in the Integrated Intervention Strategy, which will continue as planned.