I know a fair few folk in this space, at least with in UK
Paul Ingram at CSER (https://​​www.cser.ac.uk/​​team/​​paul-ingram/​​) and other staff at BASIC (https://​​basicint.org/​​) know about cyber security and nuclear weapons (see https://​​basicint.org/​​publications/​​stanislav-abaimov-paul-ingram-executive-director/​​2017/​​hacking-uk-trident-growing-threat)
Also Caroline Baylon at the Future Generations APPG has expertise on cyber security at nuclear power plants (https://​​www.appgfuturegenerations.com/​​secretariat)
I know a fair few folk in this space, at least with in UK
Paul Ingram at CSER (https://​​www.cser.ac.uk/​​team/​​paul-ingram/​​) and other staff at BASIC (https://​​basicint.org/​​) know about cyber security and nuclear weapons (see https://​​basicint.org/​​publications/​​stanislav-abaimov-paul-ingram-executive-director/​​2017/​​hacking-uk-trident-growing-threat)
Also Caroline Baylon at the Future Generations APPG has expertise on cyber security at nuclear power plants (https://​​www.appgfuturegenerations.com/​​secretariat)