Finish utility Teollisuuden Voima Ovj (TVO) said Tuesday that the Olkiluoto NPP’s nascent Unit 3 was shut down as part of a test program, but that the boron pumps, part of the plant’s safety system, unexpectedly started.
The glitch was attributed to an “incorrectly triggered signal from the automation system,” the company said.
TVO also said the fault had been rectified and “the plant’s test operation program is continued in accordance with the production forecast.”
TVO had earlier said the plant was in “a safe state” and the specific cause of the unexpected startup was being determined.