Office for Nuclear Regulation

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Heysham 1 - Planned Intervention - System Based Inspection, SBI-12 - Fuelling Machine

Executive summary

Purpose of intervention

The purpose of this intervention was to undertake Licence Condition (LC) compliance inspections at Heysham 1 power station in line with the planned inspection programme contained in the Heysham 1 Intervention Plan. The compliance inspections were carried out by a specialist mechanical engineering inspector, a specialist control and instrumentation inspector, and accompanied by a graduate trainee.

Interventions Carried Out by ONR

As part of this intervention, we carried out a safety case based system inspection of the Fuelling Machine. Through examination of this system we performed compliance inspections against Licence Conditions LC12: Duly authorised and other suitably qualified and experienced persons; 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 against each licence condition. We held pre- and post- inspection meetings with the site management where the inspection agenda was discussed and contents of this report were communicated.

Explanation of Judgement if Safety System Not Judged to be Adequate

The safety system was judged to be adequate following this inspection.

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

From an LC12 perspective, from the evidence sampled during this inspection, we considered that the operational and maintenance requirements for training and qualification of staff in the selected system have been adequately implemented, warranting an associated IIS rating of 2 (Good Standard).

From an LC23 perspective, from the evidence sampled during this inspection we considered the safety case and operating rules for the mechanical and control systems selected to be both adequate, in terms of content, and adequately implemented, warranting an associated IIS rating of 3 (Adequate).

From an LC24 perspective, from the evidence sampled during this inspection we considered the operating instructions for the mechanical and control systems selected to be both adequate, in terms of content, and adequately implemented, warranting an associated IIS rating of 2 (Good Standard).

From an LC28 perspective, from the evidence sampled during this inspection we considered that the fuelling machine is being appropriately maintained in compliance with the licensee's arrangements. During the plant inspection, we considered that the overall condition of the plant was a good indication that the maintenance regimes were being adequately implemented, warranting an associated IIS rating of 3 (Adequate).

Compliance with respect to LC27 was largely by means of adequate arrangements being implemented through LC28. We were satisfied that safety mechanisms were being appropriately addressed even though they were not specifically identified within the maintenance schedule, warranting an associated IIS rating of 3 (Adequate).

From an LC34 perspective, from the evidence sampled during this inspection we considered that containment is being appropriately maintained in compliance with the licensee's arrangements, warranting an associated IIS rating of 3 (Adequate).

The licence conditions were inspected against ONR's published guidance requirements (as described in our technical inspection guides).

Conclusion of Intervention

After considering all the evidence witnessed during each of the sample inspections undertaken against LCs 12, 23, 24, 27, 28 and 34, I consider that the safety case system inspection of the fuelling machine confirmed it meets the requirements of the safety case and is adequate.

One action was identified during the inspection, associated with LC23. This action is captured as a category 4 issue and is recorded on the ONR Issues Database.

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