A good place to start may be here:
https://www.bnfl.com/
BNFL operate the UK nuclear power stations.
I had a quick look but it seemed a bit lacking in detail but you may find some detail hidden away. The site also contains these links:
British Nuclear Group
https://www.britishnucleargroup.com
British Nuclear Group is a specialist site management and nuclear clean-up business.
Nexia Solutions
https://www.nexiasolutions.com
Nexia provides a core offering of technology and services across the nuclear fuel cycle.
Nuclear sites
https://www.nuclearsites.co.uk
Provides stakeholder information about the sites and activities for each of the UK’s nuclear sites operated by British Nuclear Group and Westinghouse
Sellafield
https://www.sellafield.com
Gives an overview of Sellafield’s operations, both current and historical.
BIL Solutions
https://www.bilsolutions.co.uk
Provides detection, measurement and monitoring technologies to support nuclear and other sectors.
UK nuclear companies
British Energy
https://www.british-energy.com
The UK’s largest producer of electricity.
UKAEA
https://www.ukaea.org.uk
Decommissions and regenerates nuclear sites.
UK associations and societies
Nuclear Industry Association
https://www.niauk.org
Trade association and representative body for the UK’s civil nuclear industry.
British Nuclear Energy Society
https://www.bnes.com
The leading learned society for nuclear energy in the UK.
Association of Electricity Producers
https://www.aepuk.com
The trade association for the UK’s electricity market, representing the companies that generate electricity.
Royal Academy of Engineering
https://www.raeeng.org.uk
Britain’s national academy for engineering
Supporters of Nuclear Energy
https://www.sone.org.uk
Aims to promote an informed debate about nuclear’s place in global energy supply.
UK Government departments and agencies
Department of Trade and Industry
https://www.dti.gov.uk
Looks after British business and industry interests.
Department for Environment, Food and Rural Affairs
https://www.defra.gov.uk
DEFRA’s responsibilities are described as “working for the essentials of life – water, food, air, land, people, animals and plants.”
Scottish Environmental Protection Agency
https://www.sepa.org.uk
SEPA provides an integrated environmental protection system for Scotland
Nuclear Decommissioning Authority
https://www.the-nda.org.uk
The newly created organisation that is overseeing and managing the clean-up of the UK’s civil nuclear industry.
Health Protection Agency
https://www.hpa.org.uk
Provides information on radiation and radiological protection.
NIREX
https://www.nirex.co.uk
Examines safe, environmental and economic aspects of deep geological disposal of radioactive waste.
Environment Agency
https://www.environment-agency.gov.uk
Public body responsible for protecting and improving the environment in England and Wales.
Health and Safety Executive
https://www.hse.gov.uk
Responsible for regulation of almost all the risks to health and safety arising from work activity in Britain.
Other nuclear companies
Westinghouse
https://www.westinghousenuclear.com
Westinghouse provides fuel, services, technology, plant design and equipment for the commercial nuclear electric power industry.
Hope some of these are helpful.
