The AUKUS (Australia-UK – US) Agreement is formally called the
Exchange of Naval Nuclear Propulsion Information Agreement
Note that the text makes clear that this agreement relates only to the provision of information on naval nuclear propulsion. It says that a subsequent agreement would need to be negotiated to support transfers of
equipment, materials or technology related to nuclear naval propulsion, once the 18 month “consultation” period is completed.
https://ipan.org.au/wp-content/uploads/AUKUS-Agreement-and-National-Interest-Analysis-2021.pdf