Flamanville 3 EPR (European Pressurized Reactor)
Flamanville, Normandy, France [INTERNATIONAL] · Construction started 2007; initial operation planned 2012; connected to grid 2024; full power December 2025 · Estimated €19.3 billion (2015 prices, equivalent to approx. £16.5 billion); final cost estimated €23.7 billion (2023 euros, equivalent to approx. £20.3 billion) from initial €3.3 billion
The judgement call
Account-gated at launchThe Flamanville EPR project has become a case study in the challenges of building new nuclear power plants in Europe, highlighting issues with project management, supply chain quality, and regulatory oversight. - The decision to proceed with the EPR design, intended to be a standardized and safer reactor, faced numerous setbacks that undermined its initial promises of efficiency and cost-effectiveness. - The extensive repairs and re-inspections, particularly for the welds, led to significant delays and cost increases, demonstrating the critical importance of quality assurance in nuclear construction. - The project's experience has influenced subsequent nuclear new-build projects, leading to greater scrutiny and revised approaches to project delivery.
Key engineering challenges
Managing significant cost overruns and extensive delays (over a decade) due to design changes, regulatory issues, and construction complexities. - Addressing critical manufacturing defects, particularly in the reactor pressure vessel (steel anomalies) and welding issues in the secondary circuit piping. - Constructing a complex double containment structure to meet stringent safety requirements for a Generation III+ reactor. - Integrating a vast number of components and systems, requiring meticulous quality control and coordination across multiple contractors. - Navigating evolving regulatory demands and public scrutiny throughout the project lifecycle.
Project facts
- Client / owner
- EDF (Électricité de France)
- Lead contractor
- EDF, with various sub-contractors including Bouygues Construction (civil engineering)
- Lead designers
- Framatome (formerly Areva NP)
- Project type
- new build
- Scale
- 1650 MWe (megawatts electric) gross output; Generation III+ reactor; double containment structure (54m diameter, 60m high); 1.3 million cubic meters of concrete.
- Disciplines
- Nuclear engineering; civil; structural; mechanical; electrical; control systems; materials science; safety engineering
- Standards & frameworks
- French nuclear safety regulations (ASN); European Pressurized Reactor (EPR) design standards; IAEA safety standards; relevant international nuclear engineering standards.
Sources: Wikipedia: Flamanville Nuclear Power Plant (https://en.wikipedia.org/wiki/Flamanville_Nuclear_Power_Plant) - Framatome: Flamanville 3 is France's first generation III+ EPR (https://www.framatome.com/en/customers/nuclear/flamanville-3/) - Bouygues Construction: Flamanville EPR (https://www.bouygues-construction.com/en/activities/energy/nuclear-energy/flamanville-epr) - Power Magazine: Flamanville 3 Reactor Online in France After 12-Year Delay (https://www.powermag.com/flamanville-3-reactor-online-in-france-after-12-year-delay/) - Montel News: France's Flamanville EPR cost to hit EUR 24bn – study (https://x.com/montelnews/status/1879446998178566627)