Bohunice Nuclear Power Plant

F1

Active reactors ( gross ):

Decommissioned Reactors ( gross ):

The nuclear power plant Bohunice (Slovak Atómové elektrárne Bohunice, abbreviation EBO ) is a Slovak nuclear power plant and is about 2.5 km from the village Jaslovské Bohunice away in Okres Trnava, western Slovakia. It consists of a total of three plants with the names Bohunice A1 ( off since 1979), Bohunice V1 ( off since 2008) and Bohunice V2 ( in operation). The systems V1 and V2 each have two pressurized water reactors VVER - 440. Very close to the nuclear power plant, the gas and steam power plant Malženice is from the fall of 2009 under the direction of E.ON in construction.

Bohunice A1

The site is also the first Czechoslovak nuclear power plant Bohunice A1. The disused since 1979 reactor was a Soviet- Czechoslovak prototype called KS 150 This is with a carbon dioxide gas -cooled and moderated with heavy water moderated pressure tube reactor, which was operated with non- enriched uranium. In addition to the fuel, the reactor was built from 1958 by Škoda and started operation in 1972.

It occurred in quick succession two serious accidents. On January 5, 1976 radioactively contaminated coolant came out in the reactor hall. The fuel elements were usually changed under full operation. After replacing a fuel assembly broke this in the pressure tube, shot from the reactor up to the reactor hall and crashed to the stationary above the reactor crane. Through the open channel, the carbon dioxide used as a refrigerant, under pressure flowed into the reactor chamber. The operating crew did manage to seal the loading crane the open channel, but two employees were not able to save time and choked. On February 22, 1977, the installation when re- filling with fuel rods was seriously damaged in the accident led forgotten remnants of the accompanying packaging desiccant silica gel on a fuel element to blockages so that the coolant could not flow through properly and it came to local overheating. The pressure tube and surrounding technological channels were damaged. In the gas - cooling circulation heavy water penetrated. Due to the rapid temperature rise of the fuel rods, the coating has been damaged in the active zone. By eliminating this barrier, the primary area has been contaminated and then because of leaks in the steam generators, parts of the secondary area. Already in the first half of 1978 it was clear that the operation of economic and technical reasons, is not resumed. The federal government decided in 1979 not to resume operations and decommission the nuclear power plant.

The accident in 1977, is run by the international accident statistics in stage 4 of the INES scale, the incident in 1976, is run as a serious accident (INES 3). The damaged and the remaining fuel from the reactor A1 have since been brought back to Russia. The reactor building represents a previously contaminated site redeveloped on the power plant site

Bohunice V1

In the complex V1 two 440 MW VVER type are used WWER-440/230 the 1st generation, due to their design, a number of security flaws have. The blocks each have an installed capacity of 440 MW and went 1978-1985 mains. By the year 2000, the emergency core cooling systems have been improved as well as the monitoring and control of the two reactors for more than 120 million euros upgraded with western technology and control electronics. These two blocks are now the most improved version of the 230 reactors worldwide.

Conversion

From 1996 to 2000 Bohunice was modernized for $ 215 million U.S.. The consortium REKON - Siemens KWU and VUJE Trnava - was the prime contractor. Numerous safety-related parts of the plant were renewed, this includes emergency cooling system, emergency power supply and the instruments including control.

Closure

The decommissioning of the plant V1 with the reactors 1 and 2, the Unit 1 and Unit 2 of the Bohunice nuclear power plant agreed with the EU in the 2003 Accession Treaty concerning by Protocol No. 9 V1 in Slovakia. The first block was shut down on 31 December 2006. Block 2 was scheduled to shut down on 31 December 2008. Four reactors of the same type were switched off in the Greifswald nuclear power plant already in 1990, as was also noted here that the reactors of the Model 230 are not capable of modernization in sufficient degree. As a substitute, two reactors are completed in the second Slovak nuclear power plant in Mochovce.

Planned re-commissioning due to gas dispute

Due to the 7 January 2009 interrupted because of the dispute between Russia and the gas transit country Ukraine gas supply the country was loud Economy Minister Lubomir Jahnatek after the consumption of the latest available for the power supply gas reserves before an energetic collapse. Therefore, the Slovak government decided on 10 January 2009 as an emergency measure to take the canceled block for a limited period of shut down to prevent the collapse of the Slovak energy supply network. The violation of the EU accession treaty by this step and the expected protests from Austria and environmental organizations took Prime Minister Robert Fico this consciously.

After a few days the Slovak Ministry of Foreign Affairs was, however, known that a restart was provisionally from the table by supporting gas supplies from the Czech Republic.

Bohunice V2

The VVER used in the system V2 are of type WWER-440/213 from the 2nd generation and went on August 20, 1984, December 18, 1985 to the network. 1987 and 1997 the plant V2 for additional use of district heating was rebuilt. The two reactor blocks Bohunice Bohunice 3 and 4 of the type WWER-440/213 modernization are capable and can be retrofitted and operated.

2005-2008, the Bohunice V2 reactors were subjected to a modernization. Among other things, the seismic stability, the cooling system and the control system was modernized. The other operation is planned by 2025. Subsequently, the performance of both units of 440 MW each was increased to 505 MW by November 2010.

Bohunice V3

The Slovak government had announced that for the shutdown of Bohunice V1 a new nuclear power plant to be built. There was the possibility of a fifth block in Mochovce and a new nuclear power plant in Kecerovce. E.ON expressed in March 2007, his interest in a new nuclear power station in Bohunice and ČEZ few months later in October also. Later it was decided at Bohunice to build a 1200 MW nuclear power plant and strong in Kecerovce also a 1,200 -MW block. Bohunice V3 will cost 3 billion euros. On 17 September 2008, Slovakia signed with France a framework agreement on cooperation in the peaceful uses of nuclear energy. By the end of an international tender of the works contract should follow. With the new energy source at Bohunice is expected around 2025.

Data of the reactor units

The nuclear power plant consists of three subsystems A1 Bohunice, Bohunice V1 (block 1 and 2) and Bohunice V2 (block 3 and 4).

Bohunice V1

Bohunice V2