UPDATE: The Martin County Sheriff's Office posted this update on its Facebook page:
The Nuclear Plant Alert Notification System (ANS) alarm that sounded last night in the Jensen Beach area, prompting several calls to the St. Lucie County and Martin County 911 centers, was identified and isolated to one (1) malfunctioning speaker. It was not a system-wide failure and did not affect the other 89 speakers located throughout the Martin and St. Lucie County area. At no time was there a problem related to the power plant and technicians are working to resolve the malfunction.
Just a reminder; FPL will be conducting their Third Quarter PSL ANS System Maintenance from October 3rd thru October 6th from 08:30 a.m. to 5:30 p.m., They will be working in Martin County today, Friday the 6th. The maintenance consists of a visual inspection, a Pre PA Message (This Is A Test) followed by a 20-second Air-Horn and a Post PA Message (This Was Only A Test.) This will be done to each siren one at a time in the St. Lucie and Martin area.
Thank you for your understanding and please pass this message along to everyone who may be affected.
The alarm system at the St. Lucie Nuclear Power Plant malfunctioned Thursday night, prompting multiple calls to 911, said the Martin County Sheriff's Office Thursday evening.
Officials said the St. Lucie County 911 system became overloaded after calls about the false alarm to the Martin County dispatch center.
According to the Martin County Sheriff's Office, FPL assured that this is an alarm malfunction and there is no problem at the plant.
The St. Lucie County Sheriff's Office said the alarm was shut off overnight.