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BKW Energie AG

Mühleberg Nuclear Power Plant: Revision completed on schedule - plant restarted

Bern (ots)

BKW FMB Energy Ltd (BKW) has restarted operations at
Mühleberg nuclear power plant (KKM) following a scheduled four-week 
annual revision and approval from the Federal Nuclear Safety 
Inspectorate (ENSI). As part of the revision, BKW carried out various
important renovation and maintenance work and performed the usual 
repeat tests on the plant's safety systems. Technically as well as in
terms of safety, the KKM is in excellent condition for long-term 
operation.
The 2010 annual revision mainly involved extensive repeat tests as 
well as work on and in the reactor pressure tank, and the use of 
specialised ultrasound systems to check various nozzles and 
pipelines. The drive systems for the reactor recirculation pump as 
well as the protective equipment for the plant's own electricity 
supply were renewed, making the facility state of the art in this 
area. Work was also carried out on a main cooling water line outlet, 
as part of a multi-year maintenance check cycle to ensure the plant's
long-term operation, and annual maintenance work was performed on a 
large number of other plant components. 36 of the 240 fuel elements 
were replaced.
The usual comprehensive annual checks and inspections were conducted 
throughout the plant, and in particular on the safety systems, 
turbines and generators, electrical protection and regulation systems
and transformers. Nothing detrimental to the plant's safety was 
found. Additional checks were also carried out on the pressure vessel
and spray lines, using the latest highly sensitive ultrasound 
measuring equipment. No relevant indications concerning plant safety 
were detected. Extensive analyses confirmed that the components are 
reliable and able to guarantee the plant's safe long-term operation.
During the revision work, more than 1,000 experts were involved: 330 
BKW employees and around 700 external specialists from Switzerland 
and abroad. The ongoing modernisation and preventive maintenance of 
the plant is performed in the interests of the plant's safety and 
with a view to its long-term operation. In terms of technical 
retrofitting, the KKM is an international standard-setter. Continual 
upgrades optimise the plant's availability and increase production. 
The KKM ensures the reliable, CO2-free supply of electricity to North
Western Switzerland. Around 40% of current requirements for 
electricity are covered by this plant.

Contact:

Antonio Sommavilla; phone 0041 31 330 51 07; e-mail:
antonio.sommavilla@bkw-fmb.ch

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