Office for Nuclear Regulation

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Hunterston B - Inspection Week and SBI14

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 2017/18.

The inspection was undertaken by the nominated site inspector and a specialist civil engineering inspector.

Interventions Carried Out by ONR

We performed a safety case informed system based inspection of the Pond and Flasks System. Through examination of these systems compliance inspections were performed against Licence Conditions (LC): LC 10 (training), LC23 (operating rules), LC24 (operating instructions), LC27 (safety mechanisms, devices and circuits), LC28 (examination, inspection, maintenance and testing) and LC34 (leakage and escape of radioactive material and radioactive waste).

The inspections were based on sampling the implementation of the arrangements in place at the station against each licence condition. The objective of the inspection was to determine whether the Licensee's arrangements for plant operational limits, plant maintenance schedules, staff training requirements and third party inspection plans were in accordance with the system's safety case requirements.

Explanation of Judgement if Safety System Not Judged to be Adequate

From this inspection, we judge that overall the safety provisions applicable to the Ponds and Flasks System inspected meet the requirements of the safety case and the safety system is adequate.

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

A system based inspection of the ponds and flasks system was carried out to judge the implementation of the station arrangements in place to ensure that relevant equipment can perform its' requisite safety function. In deciding whether these safety systems have been suitably implemented, we inspected compliance with the licence conditions detailed above.

During the course of this system based inspection it was found that Hunterston B Power Station has arrangements to ensure that the ponds and flasks system are maintained and, as necessary, operated in accordance with the safety case. The arrangements were deemed to meet legal duties, in the areas sampled. The inspection identified minor areas for improvement however none gave rise to significant concern with regards to nuclear safety. ONR have raised a regulatory issue to monitor progress against these minor compliance shortfalls identified during this inspection in relation to administrative compliance of training records.

In summary, the outcome from the system based inspection of the pond and flasks system is that the implementation of the station arrangements are deemed to be adequate, and therefore we have given an IIS rating of GREEN in respect of LCs 10, 23, 24, 27, 28 and 34.

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

After considering all the evidence examined during the inspection undertaken against LCs 10, 23, 24, 27, 28 and 34, it was considered that the Pond and Flasks System inspected adequately fulfils the requirements of the safety case.

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