Executive summary
Date(s) of inspection:
June 2025
Aim of inspection
The objective of the inspection was to obtain evidence in relation to the adequacy of NNB GenCo’s arrangements for the control of construction of the Unit 1 diesel buildings at Hinkley Point C (HPC). The Unit 1 diesel buildings will be the first structurally completed class 1 buildings on site. The particular focus of the inspection was on the implementation of arrangements to ensure conformant construction and completion of civil engineering elements, in accordance with the design intent and safety case.
Subject(s) of inspection
- LC19 - Construction or installation of new plant - Rating: Green
Key findings, inspector's opinions and reasons for judgement made
This LC19 inspection was carried out on Monday 16th June and Tuesday 17th June at Hinkley Point C (HPC). The inspection comprised of a deep dive on the Unit 1 diesel buildings (HD), as these buildings will be the first class 1 structures on site that will be completed and handed over. The inspection initially comprised of a site walkaround, where we visited the Unit 1 HD A&B and Unit 2 HD C&D buildings. The remainder of the inspection was office based, where documentation was reviewed.
This inspection highlighted no significant regulatory issues. A small number of minor observations were identified and a actions were confirmed, where appropriate.
Overall, on the basis of the inspection and evidence sampled, I judge that LC19 arrangements in relation to construction of the nuclear safety significant Unit 1 HD buildings are being implemented appropriately and are aligned with relevant good practice.
Conclusion
Upon consideration of the ONR guidance in relation to inspection ratings, I judge that a rating of Green (no formal action) is appropriate.