In the south of Slovakia, between the towns of Nitra and Levice, there are located four VVER 440/V-213 pressurised water reactors units of the Mochovce NPP.
Unit 1 supplies electricity to the power grid since the summer of 1998, and Unit 2 since the late 1999. Their gross power output was up-rated from 440 to 470 MW per each unit. Each Mochovce NPP unit generates over 3,000 GWh of electricity annually, which represents approximately 11% of Slovakia's electricity consumption.
Construction of Units 3 and 4 was suspended in 1992 and re-started in November 2008.
Mochovce units are one of the youngest VVER 440/V-213 type units. That's why they benefit from the latest technological improvements that were implemented at the plant. International expert teams have agreed that, once the safety measures are in place, the plant complies with all the international standards and nuclear safety levels, assessing its reliability as extremely high.
Since late 2008 the two operating units at Mochovce NPP have uprated power output to 235 MWe per turbogenerator, ergo the total installed capacity of units 1 and 2 in Mochovce NPP stands at 940 MWe. In 2009, the plant managed to generate over 7 TWh of electricity during a one year period for the first time in its history. This represents approximately one quarter of the overall annual electricity consumption in Slovakia.
|20 000 BC
Inhabited by humans, stone axe found
|1 259 AD
First written mention of a settlement called Mohi
Start of construction works
at Mochovce NPP – ground works
Start of construction works on Mochovce NPP unit 1 and 2
Start of construction works on Mochovce NPP unit 3 and 4
Replacement of the instrumentation and control system
Halt of the construction works
Re-start of conrtruction works on unit 1 and 2
Commissioning of unit 1
Commissioning of unit 2
Enel acquired 66 % of Slovenské elektrárne
Unit 1 and 2 installed output increased to 107%
Start of the Mochovce NPP 3&4 completion project
Commissioning of NPP Mochovce
units 3 and 4
|Number of units||2|
|Reactor type||VVER 440/V 213 - tlakovodný|
|Reactor heat capacity||1 471 MWt|
|Reactor rated output||470 MWe|
|Self-consumption||35 MW (7.2 % of the rated output)|
|Reactor pressure vessel|
|- internal diameter||3 542 mm|
|- wall thickness||140 + 9 mm|
|- height||11 805 mm|
|- weight (less internals)||215 150 kg|
|- material||legovaná Cr-Mo-V oceľ|
|- number of cooling loops||6|
|- coolant flow rate||42 600 m3/h|
|- operating pressure||12,26 MPa|
|- reactor output coolant temperature||297,3 °C|
|- reactor input coolant temperature||267,9 °C|
|- core temperature drop||29°C|
|- overall volume||242 m3|
|- number of operating fuel assemblies||312|
|- number of control fuel assemblies||37|
|- total fuel assemblies||349|
|- core fuel weight||42 t|
|- fuel used||UO2|
|- medium fuel enrichment||4,87 % U235|
|Steam-generator||6 per unit|
|- PG type||V-213|
|- amount of steam generated||450 t/h|
|- steam output pressure||4,61 MPa|
|- steam output temperature||255 °C|
|- feed water temperature||222 °C|
|- weight||169 t (less suspensions)|
|Turbo-generator||2 per unit|
|- ŠKODA type||220 MWe|
|- number of stages||1 high-pressure, 2 low-pressure|
|- rated rotational speed||3 000 rpm|
|- generator rated apparent output||250 MVA|
|- terminal voltage||15,75 kV|
|- rated current||3 x 9 500 A|
|- amount of cooling water||35 000 m3/h|
|- maximum cooling water temperature||33 °C|
|4 hydro-accumulators||70 m3 each|
|- water volume||40-50 m3|
|- nitrogen volume||20-30 m3|
|- overall barbotage well capacity||13 800 m3|
|- 4 capture chambers for gases with a capacity||16 140 m3|
|- 12 barbotage throughs||1 380 m3|
|- pump capacity||65 m3/h|
|- outlet pressure||13,5 MPa|
|- pump capacity||800 m3/h|
|- outlet pressure||0,72 MPa|
|- pump capacity||380-520 m3/h|
Nuclear power plants emit no greenhouse gas to the atmosphere, in this way NPPs annually contribute to CO2 emission reduction by 15 million tonnes in Slovakia.
Nuclear power plants hence contribute significantly to the obligation to reduce emissions of harmful greenhouse gas to the atmosphere.
Mochovce NPP meets all international requirements and that the operation impact is minimal.
Water required for cooling is taken from a water dam built on the nearby Hron river, which ensures sufficient supply of water even in extremely dry climate conditions. The impact of the discharged waters on the quality of the Hron river water, fauna and flora is negligible.
Emissions to the atmosphere and effluents to the hydrosphere are regularly measured and assessed in the 15-km area around the plant. There are 25 monitoring stations of the tele-dosimetry system, which continuously monitor the dose rate of gamma radiation, activity of aerosols and radioactive iodine in the air, soil, water and food chain (feed, milk, agricultural products). The volume of radioactive substances contained in liquid and gaseous discharges is considerably lower than the limits set out by authorities.
Civic Information Committee (CIC) Mochovce is an independent information channel to transfer information between the Mochovce NPP and the population living in its vicinity. Its establishment by Mochovce NPP was based on good practice from some world countries where similar committees had been established on the basis of voluntariness or legislation.
The purpose of the Committee consisting of representatives of the public who are active and known in the public and social life is to transfer qualified and current information by its independent members to the public in compliance with strategic objectives and goals of Slovenské elektrárne in the field of informing public and in compliance with the Act on Free Access to Information.
CIC was established by Mochovce Director as of January 1, 2005 with the aim to carry on an open dialogue with the public on peaceful use of nuclear energy, and taking into account the right of citizens to be informed truly and immediately of all aspects of operation of nuclear power plants, safety and impact of the power plant on the environment by delegated representatives of the citizens, and to improve the quality of informing the public.