Dukovany Nuclear Power Station

Dukovany Nuclear Power Station
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Name	Dukovany Nuclear Power Station
Country	Czech Republic
Location	Dukovany, Vysočina Region
Coordinates	49, 05, 06, N...
Owner	ČEZ Group
Construction began	1978
Commissioned	1985
Reactor type	VVER
Reactor supplier	Škoda Works
Ps units operational	4 × 510 MWe
Ps electrical capacity	2040 MWe

Dukovany Nuclear Power Station is a major nuclear power facility located in the Czech Republic. It is a cornerstone of the nation's energy infrastructure, providing a significant portion of its electricity. Operated by the state-owned ČEZ Group, the plant utilizes Soviet-designed VVER reactor technology and has been operational since the mid-1980s. Its consistent operation has made it a critical asset for the country's energy security and a key component in its low-carbon energy strategy.

History

The decision to construct the facility emerged from the energy plans of the former Czechoslovak Socialist Republic during the 1970s, aiming to reduce dependence on domestic brown coal. A cooperation agreement with the Soviet Union was signed, leading to the selection of the VVER-440 reactor design. The site near the village of Dukovany in the Vysočina Region was chosen for its favorable geological conditions and proximity to water from the Jihlava River. Major construction, managed by Czechoslovak enterprises like Škoda Works, began in 1978. The first reactor was connected to the grid in 1985, with subsequent units coming online by 1987. Following the Dissolution of Czechoslovakia, ownership and operation were transferred to the Czech ČEZ Group.

Technical specifications

The station comprises four pressurized water reactors of the VVER-440 Model V213 type. Each reactor has a thermal output of 1,375 MWt and a gross electrical output of 510 MWe, yielding a total installed capacity of 2,040 MWe. The primary coolant circuits are housed within a containment building designed to withstand internal pressure. The turbines and electrical generators were supplied by domestic manufacturers, including Škoda Works. The plant uses a hybrid cooling system, employing both natural draft cooling towers and a cooling reservoir formed by damming the Jihlava River. Spent nuclear fuel is initially stored in on-site spent fuel pools before being transferred to a dry storage facility located within the station's grounds.

Operational history

Since the commissioning of its final unit, the plant has maintained a high capacity factor, typically exceeding 85%, making it one of the most reliable facilities of its type in Europe. Its operations have been periodically reviewed by the International Atomic Energy Agency and have undergone significant safety upgrades since the 1990s. These upgrades, part of a long-term modernization program, included enhancements to the emergency core cooling system, reactor control systems, and seismic resistance. The plant's operational lifespan was originally designed for 30 years but has been extended following comprehensive safety assessments and component replacements, with current licenses allowing operation into the 2030s.

Safety and environmental aspects

Safety oversight is provided by the Czech State Office for Nuclear Safety (SÚJB). The plant's design incorporates multiple redundant safety systems, including the aforementioned V213 containment, which was a later addition to the base VVER-440 design. Environmental monitoring is conducted continuously, measuring emissions, water temperature, and radiation levels in the surrounding area. Compared to fossil fuel plants, the facility prevents the emission of millions of tons of carbon dioxide annually. All radioactive waste is managed according to national regulations, with low and intermediate-level waste disposed of at the Richard repository and high-level waste awaiting a final deep geological repository as part of the Czech Republic's long-term strategy.

Future developments

The primary future project associated with the site is the planned construction of a new reactor unit, often referred to as Dukovany II. This project is a central part of the Czech government's updated State Energy Policy. The new unit is expected to be a Generation III+ reactor with a capacity of approximately 1,200 MWe, securing base-load power as the existing VVER-440 units are eventually retired. The tender process has involved major global vendors like Westinghouse Electric Company, Électricité de France, and Korea Hydro & Nuclear Power. Final investment decisions and financing models, potentially involving direct state support, are under discussion in the Chamber of Deputies of the Czech Republic.