Today's scenario is an incident involving the transportation of radioactive materials.
"It's extremely unlikely that an event like this could happen for real" said a spokesman for Magnox.
"However we can't allow ourselves to be complacent and need to be prepare for such eventualities".
More top news
Steel unions say Tata Steel has made a commitment securing the future of jobs and production at Port Talbot and other UK sites.
The head of the Welsh Rugby Union has defended his decision to allow his top coaches to leave the national set-up in favour of Lions tour.
The inquest heard how Margaret Mayer, 85, - who suffered from dementia - had been killed by her husband to 'put her out of her misery.'