Fermi (USA)

Map of Fermi

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unit-1: 70 MW FBR shutdown 1972;
unit-2: BWR 1100 MW constructed by General Electric; grid connection in 1986

Facilities in Fermi

plantreactor typconstruction startoperation startshut down
Fermi-1FBR195619661972
Fermi-2BWR19691986
1995-06-02

Trip from 95% power caused by a spurioes turbine overspeed sigal. unit responded normally to the scram, but indicators for two CR did not activate properly.

1995-02-14

Hot shutdown because of small cracks in piping of the turbine bearing oil system. Replacement of the lines; The cracks may have propagated because of vibrations from the turbine, which was repaired following the failure from December 1993. Unit will be down for 2 to3 weeks. Vibration problems continued.

1993-12-24

Catastrophic failure of the LP turbine, followed by fire and flooding that severly damaged the generator. The incident happened without any warning. Vibration, seismic and reactor trip alarm sounded at the same time as the projectile from the 500 t turbine hurtled through the casing. Steam pouring from the turbine activated the fire protection system, which sprayed about 4 million liters of water into the turbine building. The wrecked turbines lubrication system spewed 65.000 liters of oil onto the floor. More water was added to the mess, when a 50 mm line of the CCW system was severed. Hydrogen ignition followed but was put out with a hand held fire extinguisher. Reactor scrammed. Safety systems functioned properly. Turbine isolation valves closed, so radioactive releases were confined to noble gases in the steam within the turbine. Fire and flooding damaged other parts of the system, including exciter and condenser. Repair cost are estimated at US$35 to 50 million Plant was down for all of 1994. Has operated only intermittently since restart.

1991-06-27

fire in main transformer -> scram FOUND INADEQUATE CLEARANCE BETWEEN THE OIL COOLANT PIPING AND THE BUS DUCT COVER.

1989-09-06

35 of the 327 containment isolation valves exceeded limits during leak rate testing.

1989-01-04

ATWS recirculation pump trip failure. Failure of the breaker would have prevented ATWS, if the plant had been operating. Both breaker trip coils burned.

1988-04-09

Shutdown cooling lost with only available RHR pump deadheaded.