The U.N.'s atomic watchdog has confirmed it's monitoring the incident at Slovenian's only nuclear power plant, but said that according to the Slovenian authorities there had been no leak of radiation.
The Slovenian Nuclear Safety Administration had informed the International Atomic Energy Agency's Incident and Emergency Centre about an "unusual event" at Krsko, said an IAEA statement released late Wednesday.
But the SNSA "said there was no radiation release to the environment."
Wednesday's incident had been at "the lowest level of emergency out of four levels as defined by the SNSA," the IAEA explained.
Acccording to the Slovenian authorities, plant operators had detected a loss in the reactor's cooling system at 1307 GMT "and decided to manually shut it down."
"SNSA said that the loss of coolant was detected in time and no radiation was released to the environment and there was no off-site impact," the statement added.
The SNSA had subsequently informed the IAEA that the reactor shut-down process was completed at 1930 GMT.
At Slovenia's request, the IAEA Incident and Emergency Centre then informed the neighboring countries Austria, Croatia, Hungary and Italy.