The emergency services will be tested today during an exercise at Wylfa nuclear power station on Anglesey.
The test will check the response of all the emergency services in the event of an incident involving the transport of radioactive material.
More top news
Carwyn Jones speaks to Labour's conference after the party's decision to re-elect Jeremy Corbyn as leader
There was disappointment for Swansea City after they lost to Manchester City for the second time in a week.
Windy with outbreaks of heavy rain pushing across the area through the evening and first part of the night.