Leibstadt (Switzerland)

Map of Leibstadt

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BWR 1000 MW, constructed by Getsco, in operation since 1984

Facilities in Leibstadt

plantreactor typconstruction startoperation startshut down
LeibstadtBWR19741984
2010-12-31
2010: Annual report of incidents

An INES 2 event occured in the NPP Leibstadt during inspection works. The maximal permitted radiation dose of 20 mSv/year for workers was exceeded for a diver. The worker received a whole body dose of 28 mSv.

In 2010 42 notifiable incidents occurred in Swiss nuclear power plants. 41 of the events were classified as INES 0, one event as INES 2.
- Beznau: 4 incidents
- Gösgen: 11 incidents
- Leibstadt: 5 incidents
- Mühleberg: 14 incidents

In comparison: 2009 27 notifiable incidents occured.
The Swiss nuclear regulatory authority ENSI states that the higher number of incidents in Mühleberg was due to malfunctions during the bringing into service of new equipment after modernization of some parts of the plant.

(source: http://www.ensi.ch)

2007-03-06

At 9:45 an emergency shutdown of the Leibstadt-reactor took place. The reason for the shutdown was a human error during a testing procedure. No increased radioactivity was released into the environment.
Ieine erhöhte Radioaktivität an die Umgebung abgegeben.

2004-05-28

The reactor was shutdown for repair. At the following startup two incidents happened: The temperature rise of the cooling agent was increased beyond operational allowances, and the drywell has been kept open. Both events have been rated INES level 1. Iodine releases have been about 2 % above the limits for short term releases.

2003-10-16

Trip of a NICCW pump during a functional test. This event was rated INES level 0.

2003-10-09

Failure of pump breaker during preparation of a SEHR functional test. This event was rated INES level 0.

2003-04-16

Failure to open an injection valve of the RCIC during a functional test. This event was rated INES level 0.

2003-02-20

Exceeding of a dose limit at a transport of radioactive waste. This event was rated INES level 0.

2002-10-07

Failure to start of a ground-water pump in the emergency system during a functionality test. This event was rated INES level 0.

2002-09-13

Non-balanced release of radioactive material from the hot-workshop. This event was rated INES level 0.

2002-08-09

Fuel rod damage with wash-out of fuel into the reactor coolant. This event was rated INES level 0.

2002-06-27

On the 26.6.2002 noon an unscheduled reactor disconnection occurred in the nuclear power station. Reason was an interruption of tension, on which the reactor switches off automatically. Radioactivity was not released to the environment according to supervisory authority.

2002-04-30

97 retired fuel elements were brought to the temporary storage facilities Wuerenlingen in July 2002 by road transport. 52 burned down elements went for reprocessing to La Hague by train in April 2002.

2002-04-23

Reactor scram caused by a defective overvoltage limiter in the 420 kV switchyard. This event was rated INES level 0.

2002-02-25

Non-conformance with operating rules. This event was rated INES level 0.

2001-12-21

In the year 2001 52 burned down fuel elements were transported into the reprocessing plant to La Hague (F). In July the first 97 fuel elements were transported into the interim storage facilities in Wuerenlingen. A second transport of 97 fuel elements followed in the late autumn.

2001-08-15

Violation of operational rules. This event was rated INES level 1.

2001-08-13

Fire cuaed by welding work in the steam tunnel. This event was rated INES level 0.

2001-08-10

Fire caused by welding work in the steam tunnel. This event was rated INES level 0.

2001-07-09

Uncontrolled opening of the generator breaker on a diesel emergency power motor during a functionality text. This event was rated INES level 0.

2001-05-29

Anomaly in the control rod information system resulting in rod movement. This event was rated INES level 0.

2001-04-03

Oil leak on a diesel emergency power supply during a functionality test.This event was rated INES level 0.

2000-08-31

Reactor scram due to overfilling of the reactor pressure vessel following a generator trip caused by the loss of the exciter transformer. This event was rated INES level 0.

2000-08-21

Fuel assembly damage with fuel wash-out to reactor coolant. This event was rated INES level 0.

2000-06-28

Leaking fuel-injection pump of an emergency power supply diesel aggregate during a functionality test. This event was rated INES level 0.

1999-10-21

Failure to start of a ground water pump of the emergency system during a functionality test. This event was rated INES level 0.

1999-08-12

Devation from the technical specification concerning the accumulators of the control rod drives. This event was rated INES level 0.

1999-04-29

Failure to open of the injection valve of the high pressure emergency feed system during a functionality test. This event was rated INES level 0.

1999-02-15

Failure to close of the generator breaker of an emergency diesel during a functionality test.This event was rated INES level 0.

1995-08-11

Hydrogen explosion in the turbine hall during refueling outage. 2 maint. workers from ABB incurred third degree burns.

1995-03-01

Full size simulator installed - ordered at the end of 1990. Costs: 32 million US$ - installed in a new information & training center (about 17 million US$).

1994-05-06

Shutdown to replace damaged fuel elements which caused slight increase in radioactivity in RCS.

1993-09-12

Only 5 days after refuelling outage the reactor had to be stopped because of a seal leak on a RCS regulation valve.

1990-10-03

Too fast startup after refueling outage was aborted by a fast shutdown. Scram during neutron monitoring testing due to a damaged relay contact in the reactor protection logic.