Office for Nuclear Regulation

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Hinkley Point C - LC17 inspection

Executive summary

Purpose of Intervention

The intervention has been undertaken to inform the ONR’s organisational capability cornerstone assessment and construction assurance assessment to inform the decision around Nuclear Island Consent (NIC) permissioning. The intervention was to sample the effectiveness of NNB GenCo’s work control arrangements and management of the delivery work packages from design, work package preparation and through into execution at the HPC site.

Interventions Carried Out by ONR

The intervention spanned one and a half days of meetings and data sampling at the NNB GenCo offices in Bristol and at the HPC construction site. ONR met with representatives from five functions in NNB GenCo to understand the current status of the Delivery Work Package (DWP) process from different perspectives.

ONR sampled the data within the current DWP database and reviewed the preparation for commencing work on the Nuclear Island Common Raft and pre-stressing gallery.

Assessment and rating was against LC 17 (1) “…the licensee shall establish and implement management systems which give due priority to safety.”

Explanation of Judgement if Safety System Not Judged to be Adequate

N/A – this was not a Safety System inspection.

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

ONR judged that the DWP process was being adequately used by the Project Managers to assess the readiness to commence work on site and was reporting delays to NNB GenCo’s governance meetings. This judgement was informed by the following observations:

While the DWP process was judged to be currently adequate based upon the sampled areas, ONR considered that difficulties could be encountered as the workloads, complexity and interactions increase in the future. Therefore, ONR reported that the intervention had identified the process has the following areas for improvement.

ONR will review the response to these areas for improvement as part of future regulatory engagements.

ONR judged that the design review was adequate based upon previous interactions between the civil engineering design and safety case inspectors assessment of the overview of the design process  through TMA at the design offices in Bristol and France.

Conclusion of Intervention

ONR concluded that the DWP process appears to be fit for the current purpose at this phase of construction. Continuous improvement will be required to meet the necessary maturity against the increase in scale of work at site. Therefore the expansion of the process will be subject to regulatory attention to give assurance that it is capable for the next phases on site, and to establish areas of potential weakness.

Overall the intervention was rated Green.