Leibstad

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Switzerland opposes building further nuclear power plants

Wednesday, May 25, 2011

BERN — The Swiss government on Wednesday recommended to parliament that the country's five nuclear power plants should not be replaced as they age, leaving them to be phased out by 2034.

The move, to be accompanied by a switch to more renewable energy, follows Switzerland's decision to suspend plans to replace its nuclear power stations in the wake of the Fukushima accident in Japan in April.

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INES-event
INES 2

Exposure of a worker in excess of statutory annual dose limits

On 31 August 2010 during the annual refuelling outage of the Leibstadt NPP, a diver was performing maintenance work in the fuel transfer pool within the fuel building. After completion of this work, he recovered an unidentified object and placed it into a transport basket. While the basket was lifted, before reaching the surface of the water, an alarm of the area radiation monitor was triggered. Therefore, the basket was lowered again.
As a result of the handling of the object, the diver received a hand dose of about 1,000 mSv which is twice the statutory limit of 500 mSv.

Category: Power Reactor Leibstad Switzerland »

Switzerland to return decommissioning funds to nuclear plant operators

Tuesday, December 11, 2007

Switzerland has issued a new decree to address excess funds for nuclear decommissioning and waste disposal, the Swiss Energy Office said on Monday.

The decree will take into account the longer-expected lifetime of nuclear power plants from 40 to 50 years, which has left excess sums totalling around CHF 600-700 million (EUR 363-423 million) in the funds. These sums must now be returned to nuclear power plant operators. The total cost of decommissioning and waste disposal for Switzerland's five nuclear power plants was estimated at CHF 13.7 billion in 2001, the majority of which (CHF 11.8 billion) was allocated for the disposal of waste. By the end of 2006, around CHF 4.4 billion had accumulated in the funds.

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INES 1

Reactor Scram due to Inadvertent Opening of Multiple SRV’s

On March 6, 2007, Leibstadt NPP (GE BWR/6, 1165 MWel, net) was operating at the full rated power. Plant staff was preparing planned instrumentation functional tests at the SEHR division 51, which required the simulation of SEHR actuation signals. The SEHR-system (Special Emergency Heat Removal System) is a bunkered, protected system designed to ensure the safe shutdown and residual heat removal during special emergency conditions, e.g. airplane crash, explosion, fire, third party action, etc.

Category: Power Reactor Leibstad Switzerland »

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INES 1

Violation of heat-up rate during restart of reactor

From 28 to 29 May 2004 a scheduled plant shutdown for repairing a primary leakage (gland of a control valve ) inside the containment was carried out. In the course of the restart on 28 May (criticality at 22 h 48), at about 50°C, the reactor was made critically for warming-up. During that process, which is closely monitored by the operator to switch over timely the neutron flux monitor ranges (eight decades) to prevent a Scram, he did not fully recognize the positive temperature coefficient of the fuel near to the end of the cycle (power increased to approx.

Category: Power Reactor Leibstad Switzerland »

INES-event
INES 1

Violation of Containment ventilation operation mode

From 28 to 29 May 2004 a scheduled plant shutdown for repairing a primary leakage (gland of a control valve ) inside the containment was carried out. During preparation of the restart on 28. Mai (control room check at 19.00 hours) the operators failed to recognise that containment ventilation was in a condition not allowed for plant start-up (as required by Technical Specification). The check was done in the control room by checking the indicator lights: large purge (light was on), small purge (light was off), this was errorneous interpreted. In effect, only the “small purge” was allowed.

Category: Power Reactor Leibstad Switzerland »

INES-event
INES 0

PERSONNEL INJURY IN TURBINE HALL DURING REFUELLING

At ca. 9.00 a.m. a deflagration occurred in an auxiliary steam generator while opening the inactive side of the steam generator, located in the turbine hall. Two workers were injured and immediately transported to hospital. The plant is in refueling state since one week. No radioactive release happened. Neither any safety system was involved, no plant equipment was damaged. The injured persons are not contaminated.
Rating explanation:
The event can be rated as out of scale but because of the deflagration in the turbine hall of BWR the event was rated as below scale/zero.

Category: Power Reactor Leibstad Switzerland »

INES-event
INES 1

REACTOR START UP WITH DEGRADED REACTOR SHUT DOWN SYSTEMS

During start up tests after refueling the reactor was made critical (zero power) without pressurized scram accus (violation OL&C). The unavailability lasted 3,5 hours and was detected during shift turnover. No initiator and scram challenge occurred. All other safety systems were available. Remaining shut down function during degradation:
- high reactor pressure replace the scram accus (above 30 bars)
- control rod drive system and boron injection system
Basis for rating: Table III.1 of User's Manual
a) Initiator: Rod ejection unlikely (3)

Category: Power Reactor Leibstad Switzerland »