Krsko (Slovenia)

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630 MW PWR unit; constructed by Westinghouse; grid connection in 1981. The site is unfavourable because of its earthquake risk.

Facilities in Krsko

plantreactor typconstruction startoperation startshut down

Slovenia Informs IAEA of Reactor Shut-down, But Says No Radiation Was Released to Environment

"4 June 2008 | The Slovenian Nuclear Safety Administration (SNSA) today informed the IAEA´s Incident & Emergency Centre (IEC) about an "unusual event" at the country´s Krsko Nuclear Power Plant, but said there was no radiation release to the environment.

An "unusual event" is the lowest level of emergency out of four levels as defined by the SNSA.

According to the SNSA information that came to the IAEA´s IEC at 16:20 UTC (18:20 CET), plant operators have detected a loss in the reactor´s cooling system at 13:07 UTC and decided to manually shut it down. SNSA said that the loss of coolant was detected in time and no radiation was released to the environment and there was no off-site impact. SNSA later told the IAEA that the reactor shut-down process was completed at 19:30 UTC.

Upon request by SNSA, the IEC informed the neighbouring countries Austria, Croatia, Hungary and Italy."



The atomic power plant Krsko is still to 100 per cent in Slovenian property. But the re-allocation of the portions, the management and production, one half to Slovenia and one to Croatia, get along well according to undersecretary of state Robert Golob. When Krsko was put into operation in 1981, the Federal Republic of Yugoslavia still existed. The power station was conceived for the current supply of the Federal States Slovenia and Croatia. With the decay of Yugoslavia in 1991 Krsko was on Slovenian national territory and produced for the Slovenian energy market.
The reorganization of financial circumstances between the succession nations dragged itself into the previous year because of the difficult relations between the neighbours. A common Slovenian-Croatian management, whose president is Slovene, will lead the nuclear power plant. An agreement was made that 50 per cent of current production are provided directly to the Croatian market and has to be used from Croatia for the national power supply. This measure is to prevent speculations. The details have to be negotiated.


By setting up three observation points around the N-plant - the fourth one is to be constructed shortly - Slovenia has fulfilled one of the conditions set by Austria to withdraw its veto on Slovenia's accession to the EU. Slovenia is an active earthquake zone, especially the area around the N-plant, and the four observation points are just a part of a network of 25 observation points spanning the entire country. The entire network is to be completed by the end of next year.


Management of Krsko NPP cut off 300 MW of regular supply to Croatia when Croatian members of the operating company's Supervisory Board again failed to attend a meeting the previous week to discuss the problem of overdue Croatian bills.
Slovenia has begun exporting the resulting surplus electricity, mainly to Italy.
There is no sign Croatia is any more ready now than before to quickly settle the 2,4-billion-tolar (roughly U.S. $15-million) arrears claimed by Krsko for electricity deliveries this year, because Croatia disputes the 1,65 (U.S.) cents/kWh price which as excessive.
Krsko now has only one remaining 400-kV connection (to Maribor) in operation, contrary to safety requirements.


The Slovenian government announced it is ready to start official negotiations on restructuring Krsko NPP management and concluding new ownership contracts with Croation co-owner Hrvatska Elektroprivreda (HEP), but at the same time it issued an ultimatum for HEP to settle its Krsko debts within 10 days or face reduction or stoppage of electricity supply.
Krsko´s current problem is a dispute over HEP´s payments for electricity deliveries and into a decommissioning fund, HEP´s participation in the DM 200-million modernization program.

It was reported that HEP currently owes Sit 2.3-billion for electricity deliveries so far this year, and a further Sit 10-billion (or a total of about DM 130-million) from before 1998. However, just two weeks earlier, Slovenian Foreign Minister Boris Frelc estimated the total as around DM 220-million.

On June 24, Krsko General Director Stane Rozman said that Krsko is forced to seek short-term bank loans to meet operating costs because of HEP´s refusal to pay. He said the plant would, finally, start legal proceedings against HEP if it did not meet the deadline.


The bi-national Business Board of the Krsko Nuclear Power Plant is again in big troubles. The four modernization contracts let in February/March, are now being called into question.
Croatian electricity payment arrears amounting at that time to the equivalent of DM 11-million.
Also in September 97, it was agreed to set up a joint expert commitee to deal with restructuring of Nuklearna Elektrarna Krsko, incorporating it as a private commercial company. But Krsko is still operating under obsolete ex-Yugoslav (worker self-management) laws pending negotiation of a new market-based contract between the owners. ""We have been pressing for speed on this restructuring because the situation is becoming more and more complicated."


Framatome-Siemens to make SG´s for Slovenia

14-year-old Krsko NPP in Slovenia has ordered two replacement SG´s from the Framatome-Siemens consortium. The DM 50 million contract is for SG´s of Siemens design to be delivered in 1999. Framatome-Siemens have now won work on nine out of 13 European nuclear units SG renewal projects.


Among the three plans proposed for the decommissioning of the Krsko NP station, the government yesterday decided upon immediate decommissioning.
At the same time, the government accepted a strategy for handling spent nuclear fuel. Slovenia has decided upon an interim solution to this problem, which means that by the year 2020 a permanent site for the nuclear waste will have to be chosen and, by the year 2050, proper storage facilities built. In the meantime, highly radioactive waste will be taken care of by expanding current storage capabilities.


Eight companies responded with 15 separate bids to Nuklearna Elektrarna Krsko´s (NEK) January 26 call for tenders for four separate contracts - three related to replacing the two SG´s, and one for a plant-specific full-scope training simulator.
Westinghouse and a Siemens-Framatome consortium are competing for all four contracts, said an NEK spokesman after the April 19 bid opening
Bids to design and supply the new SG´s for the 634-MW Westinghouse PWR also came from Japan's Mitsubishi Heavy Industries Ltd. (MHI) and Babcock & Wilcox Canada.
For the contract to remove the old SG´s and install the new ones, MHI and Bechtel both bid - Westingshouse´s bid for this portion of the work contemplates a consortium with Bechtel.
Software for safety analysis of the replacement work and a planned power uprating was also bid by B&W Canada.
For the simulator supply, bidders also include S3 Technologies of the US, Thompson of France and CAE Ltd. of Canada.


With the threat of a referendum on closing Slovenia´s Krsko PWR deflected, and with the blessing of the national parliament, Nuklearne Elektrarne Krsko (NEK) is proceeding with long-delayed plans to replace the unit's two steam generators.
Bid requests were sent January 19 to four potential suppliers for steam generator manufacture and related services and to three additional companies for supply of a fullscope simulator. NEK hopes to do the replacement in late 1999 or early 2000, which would make it one of the last steam generator change-outs currently anticipated in Europe.
Krsko is licensed for 40 commercial power years, until 2023; life extension could technically stretch that another 20 years, but the economics of such an initiative would have to be examined.
NEK had divided the job into four bid packages, covering manufacture of two new steam generators and their transport to the site; the replacement operation itself; licensing aspects including preparation of a new safety analysis report supporting a planned 6,3% increase in thermal power and supply of a full-scope plant-specific simulator.
All four bid request packages had been addressed to Siemens-Framatome consortium, Westinghouse, Mitsubishi Heavy Industries, and Bechtel, which is allied with Babcock & Wilcox Canada for the steam generator manufacture.
Bids for the full-scope simulator, the engineering director said, have been solicited from three other manufacturers: S3 Technologies of the US, CAE of Canada, and Thomson of France, the companies which have made full-scope simulators within the last five years.
The units have an average plugging rate of 16,7% today, and although Krsko is still operating at nominal power, it will probably have to derate before the new units can be installed. Analysis has shown that derating will be needed if plugging exceeds 21%. This May, a"big sleeving campaign" is planned at Krsko by ABB Reaktor of Mannheim, Germany.
NEK is specifying new design features for the replacement steam generators. The specifications are"very similar" to those used for new steam generators at Ringhals-2 and -3 in Sweden and Doel-3 in Belgium.
The value of the four contract packages is estimated to total $120-million. The steam generator-related work is expected to be over two-thirds of that total.


A referendum on closure of the Krsko nuclear plant, originally scheduled for December 24, was cancelled last month when a group of Slovenian lawmakers withdrew their support for the initiative.
The LDS members who originally supported the referendum motion accepted the government's argument that more - and more precise - data on the consequences of closing Krsko are needed before proceeding with the vote. What they demand in exchange is a clear statement of longterm energy strategy. Strategy proposals are in the throes of parliamentary committee drafting and appraisal.


Start of maintenance & refuelling outage; Extensive work on the SG ! restart at 6-6-95.
Krsko owners agree that the SG should be replaced in 1996/97. Award of the US$ 100 million replacement contract to Westinghouse is virtually assured.


Leak in SG -> shutdown short after the outage which was also due to a SG leak.