Protesters dressed as fish locked themselves together and blocked the entrance to Sizewell nuclear station in Suffolk for three hours on Wednesday.
They claimed EDF Energy were not properly considering the possibility of floods and coastal erosion at the site.
Protester Emma Bateman, 42, said : "We see coastal erosion in Suffolk and Norfolk every day, yet nuclear stations are built virtually on the beach."
EDF Energy said : "We respect the rights of individuals to peaceful protest." (…)