Question to the Ministry of Defence:

To ask the Secretary of State for Defence, pursuant to the Answer of 8 May 2025 to Question 49938 on Nuclear Submarines: Safety, whether he plans to publish further information on those incidents.

Nuclear safety is of paramount importance and is a critical aspect of our commitments. As such, HMNB Clyde complies with international best practice as recommended by the International Atomic Energy Agency (IAEA). Nuclear safety at these sites is independently overseen by the Defence Nuclear Safety Regulator (DNSR) and the Office for Nuclear Regulation (ONR), who have robust powers to address concerns and recommend changes where necessary. These structures ensure that nuclear safety is treated with the seriousness that it requires. This becomes even more important as this Government affirms its cast iron commitment to the strategic deterrent as the bedrock of our defence.

With this in mind, the Secretary of State has authorised the annual release of the statistics on Nuclear Site Event Reports (NSERs) for HMNB Clyde. NSERs are a means of classifying the significance of safety incidents with actual or potential impact and are recommended by the IAEA to ensure a robust safety culture that learns from experience. This information has previously been provided on request, but in recognition of the importance of the subject, this data will now be provided as a standing commitment to strengthen oversight and scrutiny.

I hope that the hon. Member will understand that releasing specific information for each NSER, when coupled with other information that may already be in the public domain through other means, would not only enable adversaries to make deductions about the operability, capability and effectiveness of the facilities and functions at HMNB Clyde, but would also provide invaluable information about submarine availability. Such information would prove extremely useful to hostile powers and groups in enabling them to target, disrupt and degrade the effectiveness of RN activities.