Document 6 contains items of relevant text copied from a larger report, as the majority of which was not within the scope of your request.
Regulation 13 - Personal Information, this is an absolute exemption and not subject to the Public Interest Test.
Regulation 12(5)(a) -a public authority may refuse to disclose information to the extent that its disclosure would adversely affect (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.
The balance is clearly in favour of limiting the potential for a malicious act. The public interest test in this instance would favour prudence by not releasing this information.