The last of the three reactors working at the Tihange plant in southeast Belgium shut down automatically around 1:00 am (local time) following the alarm, said Electrabel, a subsidiary of the French firm Engie.
At Belgium's only other nuclear plant, located in the northern region of Doel, two of the four reactors remain shut down following previous problems.
Pre-planned maintenance work in the Tihange 3 reactor block "triggered an alarm which caused activity to stop," Electrabel spokesman Serge Dauby told AFP.
Dauby said that "from the middle of the night, technicians and experts were called in to study the causes and needs for repairs and maintenance so that we can come back on line as soon as possible."
Electrabel said in a statement later that it aimed to restart the reactor overnight Friday.
The difficulties besetting Belgium's nuclear plants have hurt financial results at Engie, whose profits fell 56 per cent to 1.11 billion euros in the first half of the year.
They are due to go back on line on November 1 at the earliest.
Engie said in May that closing down the Doel 3 and Tihange 2 reactors were costing the company around 40 million euros a month in net profit.
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