Reg 13 Personal Information, this is an absolute exemption and not subject to the Public Interest Test.
Reg 12(5) (a) - international relations, defence, national security or public safety.
There is a public interest in Government being as open as possible about matters of nuclear security
There is a clear requirement to prevent the disclosure of sensitive information about nuclear security that could assist a person or group planning theft, blackmail, sabotage and other malevolent or illegal acts involving nuclear sites, nuclear material or individuals working on or with those sites and materials.
In this case, disclosure would reveal details about the current level of capability that may prejudice national security The public interest test in this instance would favour prudence.
Issues related to the nuclear industry are subject to close scrutiny and debate, there is public interest in information related to nuclear activities and the release of such information.
Also to promote transparency and build public confidence in ONR's investigative process.
The disclosure of commercially sensitive information would prejudice the commercial interests of an individual or body by revealing details of issues which are currently under discussion.
Reasons why public interest favours with holding information
On balance, it is not in the public interest for the release of commercial information in this case at this time