Office for Nuclear Regulation & Environment Agency

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Getting involved

We want you to understand what we are doing and why it is important. We've deliberately made the GDA process open and transparent.

We are:

Commenting on reactor designs

GDA includes a comments process. The reactor design company is encouraged to publish detailed design information on its website and update it as new information becomes available.

Anyone can view that information and comment on it. The design company is required to respond to questions and comments about their design. We are able to see both question and response so that we can consider them in our assessments. Comments can also be made to the Joint Programme Office.

The comments process for General Nuclear System Ltd’s UK HPR1000 reactor design

You can make a comment about the UK HPR1000 design via General Nuclear System Ltd’s website. The company will respond to the comments and issues raised.

We will see both the questions raised and the responses made and will use these, where relevant, to help inform our assessments of the UK HPR1000.

The comments process opened on 16 November  2017 and will continue throughout the GDA of the UK HPR1000 until around four months before we make our decisions on the acceptability of the UK HPR1000.

Our comments process document describes the process in more detail.

Closed comments processes

The comments processes for these reactor designs are now closed

Keeping you informed

We regularly publish quarterly updates on this website.

You can sign up for our e-Bulletin updates.

We will continue to take part in local events and conferences to share the latest information with you.

You can also follow @The_ONR and @EnvAgency on Twitter.


Each regulator designed its GDA process to reflect as closely as possible its normal process for applications for nuclear site permits.

The Environment Agency and Natural Resources Wales consulted on their preliminary conclusions following detailed assessment of the UK ABWR reactor design. They carefully considered respondents’ views in reaching their decision 2017.  on whether to issue a statement of design acceptability.

The Environment Agency consulted on its preliminary conclusions following detailed assessment of the UK-EPR design and AP1000 design during 2010.