Dresden (USA)

Map of Dresden

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3 BWR units: unit-1: 200 MW sutdown in 1978; 2 * 800 MW constructed by General Electric

Facilities in Dresden

plantreactor typconstruction startoperation startshut down
Dresden -2BWR19661970
Dresden -3BWR19661971
Dresden-1BWR195619601978
1995-11-10

Commonwealth Edison Co. announced November 10 that it was immediately suspending virtually all work on Dresden-2´s refueling outage.
Because management was surprised by how much must be done to finish the outage and needs time to replan and reprioritize. Workers assigned to the Dresden-2 outage had been shifted over to work on unexpected turbine problems at Dresden-3, and that shift had slowed work on unit 2.
Dresden-3 has been dogged by numberous equipment problems since it came out of ist own refueling outage September 7, and has not reached full power. It has hovered between 20% and 75% power and has scrammed twice.

1995-05-28

Scram because of a broken turbine blade which caused high turbine vibration. An 20 mm section of one blade was missing on the LP turbine and 2 adiitional blades were bent. During shutdown there was also a problem with a MSIV which did not shut completely.

1994-07-02

Fire in a non-nuclear storage at the site. Fire was extinguished after about 20 minutes. Unit-1 was shutdown.

1994-04-20

Cracks found in core shroud during outage by Ultrasonic tests. cracks are 20 to 40 mm long.The core shroud is made of 50 mm steel plates, containes the fuel assemblies and holds the JET pumps. cracks were found in Quad-Cities-1, too.
First time cracks in core shroud were found was in 1990 at Muehleberg, and later at Brunswick-1.
Deep cracks in core shroud are a serious problem, because rupture of the shroud could prevent insert of the control rods into the core, in case of a accident.

1992-10-01

date?? defects in transverse in-core probes, leakage of MSIVs

1991-08-17

Following a turbine trip, diesel service water pump could not automatically start -> loss of EDGs.

1991-07-31

undervoltage relay setpoints for the emergency busses were incorrectly calculated, would not have protected ECCS load under all conditions.- since initial operation

1991-05-17

Leakage around the charcoal absorbers of both trains of the standby gas treatment system exceeded the limits, leakage caused by degradation of the charcoal trays´gasket material

1991-05-17

leakage around the charcoal absorbers of both trains of the standby gas treatment system exceeded the limits, leakage caused by degradation of the charcoal trays´gasket material

1990-08-02

Safety relief valve spuriously opened and remained stuck open-> manual scram and manually initiated containment cooling and low pressure injection.

1990-01-16

Loss of offsite power with multiple equipment failures: failure of reserve auxiliary transformer after one condensate pump tripped, pump motor caught fire.

1989-10-23

Leakage of feedwater into the HPCI system through the injection valves resulted in water hammer and the potential of thermal stratification and steam binding.

1989-10-23

Leakage of feedwater into the HPCI system through the injection valves resulted in water hammer and the potential of thermal stratification and steam binding. Feedwater back leakage caused high line temperature. Dresden-2 experienced simiiar condition.

1989-08-27

HPCI room cooler drive belts had broken

1988-05-17

All 8 MSIVs failed to fully close when air was removed from pilot solenoid suring test.

1988-05-09

Motor brush assembly failure in HPCI system.