Office for Nuclear Regulation

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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

A Control and Instrumentation (C&I) inspector and I (the nominated site inspector for Hinkley Point B) carried out a compliance inspection on LC26 (control & supervision of operations), reviewed progress with the licensee’s investigation into the recent event with the Nitrogen injection lines, met with the site internal regulator, held information gathering meetings with NGL and attended the Site Stakeholder Group meeting.

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

Not applicable as no system based inspections were carried out during this visit.

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

We carried out a compliance inspection of LC26 (control & supervision of operations) which was focussed on the Reactor 4 2015 statutory outage.    We were satisfied that processes were in place to provide assurance that the outage planning and execution were being adequately managed.   An outage delivery structure had been established and resourced and we were satisfied that adequate control and supervision of operations was demonstrated.    We therefore assigned an IIS rating of – 3 (adequate) to this inspection.

I reviewed progress with the licensee’s investigation into a recent event with the Nitrogen injection lines and was satisfied that progress was being made.  I met with the site internal regulator to discuss recent events, on-going inspections and future intervention topics.  I held information gathering meetings with station staff on a range of topics including plant status, the revision of the Technical Specification relating to the kerosene storage tanks, inspection plans for 2015/16 and progress with the new Nitrogen plant.  Finally I attended the Site Stakeholder Group meeting.

Conclusion of Intervention

For LC26 (control & supervision of operations) we were satisfied that processes were in place to provide assurance that the outage planning and execution was being adequately managed.  Progress was being made with several projects on site and the Site Stakeholder Group meeting was useful and informative.

There are no findings from this inspection that could significantly undermine nuclear safety.