Office for Nuclear Regulation

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Hunterston B - Inspection Week

Executive summary

Purpose of intervention

The purpose of this intervention was to undertake planned inspections 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.

Interventions Carried Out by ONR

We undertook a system based inspection of the solid and gaseous radwaste systems, during which we assessed compliance against the following licence conditions:

We undertook a compliance inspection against licence condition 23 (LC 23 - Operating Rules). During this intervention, the nominated site inspector attended the quarter 4 Hunterston site stakeholder group meeting on 1st December 2016 at the Lauriston hotel, Ardrossan.

Explanation of Judgement if Safety System Not Judged to be Adequate

Based on the sample made during this inspection we judged that the solid and gaseous radwaste systems adequately meet the requirement of the safety case.

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

In relation to the system based inspection of the solid and gaseous radwaste systems, we made the following observations and judgements:

Overall system health appears to be good for both systems inspected. We further observed that a long-standing claim on an automatic water detection system in the vaults is no longer relevant; the system has never been successfully commissioned and the station uses the results of annual camera inspections as a surrogate measure. The station committed to update its safety case claim.

In relation to the LC 23 compliance inspection, we made the following observations:

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 the system based inspection of solid and gaseous radwaste systems, we allocated inspection ratings of ‘Green' for LC 10, LC 23, LC 24, LC 27, LC 28 and LC 34.

From the evidence gathered during the LC 23 compliance inspection, we allocated an inspection rating of ‘Amber'.

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