Office for Nuclear Regulation

Hinkley Point C – Inspection ID: 51696

Executive summary

Date(s) of inspection:

  • November 2022

Aim of inspection

The purpose of this Intervention was to assess progress associated with the development and implementation of the Mechanical, Electrical and Heating, Ventilation and Air-conditioning (MEH) Alliance (MEHA) Integrated Management System (IMS).

Subject(s) of inspection

  • LC17 – Management systems – Rating – Green

Key findings, inspector’s opinions and reasons for judgement made

The inspection team’s preliminary findings were shared with, acknowledged, and accepted by NNB Generation Company (HPC) Ltd’s (NNB GenCo) management as part of normal inspection feedback. These findings can be summarised as follows:

  • There was clear evidence of improvements to the IMS being delivered, with further improvements planned.
  • A revised version of the Project Delivery Model (PDM) has been developed and provides an effective navigation tool for staff of the MEHA and NNB GenCo.
  • There is now enhanced clarity on the application of the MEHA and NNB GenCo IMS, with dedicated training to be rolled-out to relevant staff.
  • The MEHA are effectively engaging with NNB GenCo to share learning and collaborate on the development of the IMS.
  • ONR observed that the planned audit programme had not been delivered.
  • There is no formal governance panel for providing oversight and governance of the IMS. Therefore, the MEHA would benefit from reviewing the oversight and governance mechanism.
  • Whilst a significant amount of work has been undertaken across the project to update Programme Definition Documents (PgDDs), a number were beyond their review date.

Actions are in-progress to address the areas for improvement and, therefore, these matters will be progressed through future interactions with the MEHA and do not warrant a Regulatory Issue.


On the basis of the evidence sampled, the MEHA IMS is being developed and implemented in line with relevant good practice (RGP), with only minor areas for improvement identified. Hence, a GREEN rating was assigned.