How to apply for Fellow (FNucI)

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Who should apply?

Established Nuclear professionals who have significant autonomy and can demonstrate they have made a significant contribution to the nuclear sector.

 NI Fellows are established nuclear professionals from a wide range of technical and non-technical disciplines, who apply personal behavioural standards and exercise judgement based on an understanding of the Nuclear Delta®, as applicable to their role and work context, to ensure their decisions and actions support nuclear safety and security, both now and in the future.

 Recognition as a Fellow of the NI demonstrates your standing and influence as a leading nuclear professional.

Fellow (FNucl) Brochure

Professional Registration (optional)

The NI is licensed by three bodies, the Engineering Council, the Science Council and the Society for the Environment, to assess applicants for entry onto the respective professional registers, at the registration grades of Chartered Engineer, Chartered Scientist, Chartered Environmentalist, Incorporated Engineer, Engineering Technician and Registered Environmental Technician. 

Find out more about each of the registration pathways: Engineering ; Science ; Environment 

How do I apply?

Complete the relevant Application Form selected from the table below.

Use form MF2 If you are an Associate member or not yet an NI member and wish to join at the grade of Fellow
Use form MF3 if you are currently a Member (MNucI) and wish to upgrade to Fellow
Use the applicable form MF201 to MF206 if you wish to apply for Fellow plus one of the professional registration grades at the same time
Use the applicable form RF401 to RF405 if you are already a Member or Fellow of the NI and wish to add professional registration

Your completed application form, along with a full CV, copies of certificates, CPD records and the application fee (please see checklist at the end of the application form), should be emailed to


Closing date for the next Membership Committee to consider membership and professional registration applications is Thursday 2nd November 2023.  

For further guidance and support please access the NI Membership Resources before completing your application.

Application Form Table - please click on a link below to download the applicable application form.

Fellow only application forms

Fellow plus registration forms

Current NI Members or Fellows
wishing to add registration

MF2 Fellow application

MF3 Fellowship Upgrade application
– for current MNucI applying for FNucI

MF23 Fellowship Reference Form
All applicants for Fellow should download and
forward to their Referee for completion.
Completed reference forms should be submitted with the application



MF201 Fellow and Chartered Engineer

MF202 Fellow and Incorporated Engineer

MF203 Fellow and Engineering Technician

MF204 Fellow and Chartered Scientist

MF205 Fellow and Chartered

MF206 Fellow and Registered
Environmental Technician

RF401 Chartered Engineer

RF402 Incorporated Engineer

RF403 Engineering Technician

RF404 Chartered Scientist

RF405 Chartered Environmentalist

RF406 Registered EnvironmentalTechnician


Guidance for Applicants - Please download the guidelines below

MF1 Series guidance - for Member only applications or Member plus professional registration


MF2 Series guidance – for Fellow only applications or Fellow plus professional registration


MF 4 series guidance – for current Members or Fellows adding a registration grade


If you haven't found the answer to your question, please don't hesitate to contact the Membership Team who will be happy to assist. 

phone-greyonwhite 03303 410574