Office for Nuclear Regulation

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Hunterston B planned Intervention

Executive summary

Purpose of intervention

The purpose of this intervention was to undertake a system based inspection at EDF Nuclear Generation Limited’s (NGL’s) Hunterston B power station in line with the planned inspection programme contained in the Hunterston B Integrated Intervention Strategy (IIS) for 2016/17.

The inspection was undertaken by the nominated site inspector and a specialist internal hazards inspector.

Interventions Carried Out by ONR

During this intervention, inspections were undertaken against the following Licence Conditions (LC):

I also undertook a quarterly review of the station’s progress against regulatory issues and met with the station independent nuclear assurance team to review matters of mutual regulatory interest.

Explanation of Judgement if Safety System Not Judged to be Adequate

No system based inspection was undertaken during this intervention.

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

In relation to LC 12, I:

In relation to LC 21:

Our subsequent site walkdown revealed the good progress made since the December 2015 inspection. We noted significant progress had been made over the year, and that the project had surmounted some problems and still had a credible plan to meet the handover date.

I observed that several long-standing, albeit generally low-level in nuclear safety significance, regulatory issues persist. The station committed to maintain pressure on staff to deliver on action requests and secure prompt closure; he also committed to ensure that attention on routine management of regulatory issues is sustained to prevent future recurrence of the previous backlogs.

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

From the evidence gathered during this intervention:

I considered that the station continues to be demonstrably compliant with its arrangements under LC 12; arrangements for training and authorising the next cohort of DAP operators and continuous training appear to be robust. This justifies an inspection rating of - ‘Green’.

In light of the good progress being made in the CO2 project and demonstrable alignment to the station arrangements under LC 21, we have allocated an inspection rating of ‘Green’ for LC 21.

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