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
You could be forgiven for wondering where summer has got to over the next few days! Sunshine, showers and disappointing temperatures!
Stephen Kinnock has led a delegation of campaigners calling for a posthumous pardon for Dic Penderyn.
The latest figures show skin cancer numbers for people over 55 have almost tripled in the last 20 years.