Palisades nuclear power plant is returning to the grid today after an electrical problem forced the plant to cut power for the second time this month.
U.S. Nuclear Regulatory Commission spokeswoman Viktoria Mitlyng said that on Saturday an electrical fault caused the main generator to trip triggering a turbine shutdown for Entergy’s 789 megawatt plant near South Haven.
“During plant shutdown, a valve that normally allows the steam that comes from steam generators to be vented into the condenser did not open,“ Mitlyng said. “When this valve failed to admit steam to the condenser another system, a backup system … relieved steam to the atmosphere.”
Mitlyng said that the incident had no impact on the environment or the health and safety of the public and that the cause is still under investigation.
The outage came just five days after the plant returned to full power from an incident that drastically reduced the plant’s power production for eight days.
On January 8 Palisades operators declared an emergency after an electrical breaker shutdown cut power to pumps and fans needed by one of the plants cooling towers.
“Back to back trips are rare,” said Arnie Gunderson chief engineer at the nuclear consulting group Fairewinds Associates, “…. both recent shutdowns were electrical, which suggests that there is an underlying root cause that has not yet been discovered.”
“Trips from full power are also rare, there were only about 80 in all the nuclear reactors last year, so [Palisades] is an outlier because of these TWO recent unexplained power reductions.”