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
Luke Williams has not seen his mum for six months. She has applied for several visas to join her family, but she has been refused so far.
Gareth Bale has missed the majority of this season through injury.
A few showers at times but elsewhere it's bright and breezy, although always on the chilly side!