Imagine witnessing a monumental milestone in nuclear engineering—Framatome has successfully completed the manufacturing of the reactor pressure vessel for the second unit of the Hinkley Point C nuclear power plant in Somerset, UK. But here's where it gets controversial: this vessel is not just a massive piece of steel; it's a crucial component that holds the future of clean energy for millions. Alongside this achievement, the company has also finished two of the four steam generators needed for this second reactor unit.
This reactor vessel is an enormous structure, measuring about 13 meters in length and weighing around 500 tonnes. It was meticulously constructed at Framatome’s facility in Saint-Marcel, located in Chalon-sur-Saône, eastern France. Last November 28, a special celebration was held at this plant, where the EDF team and stakeholders gathered to mark this significant milestone. During the event, the delegation watched as the vessel was carefully prepared for its journey across the Atlantic to Somerset.
So, what exactly is this reactor pressure vessel, and why does it matter? It is a robust steel cylinder that contains the core of the reactor—the heart of the nuclear process. This vessel also accommodates essential internals that support and stabilize the reactor core, ensuring safe operation. Moreover, it guides the flow of coolant—a vital part of the plant’s cooling system—and governs the movement of control rods that regulate the nuclear reaction.
For context, the first reactor pressure vessel at Hinkley Point C was completed earlier at Framatome’s Le Creusot plant in Burgundy, France—delivered to the site in February 2023, stored until the installation in December 2024. Now, with the second vessel completed, EDF reports that the project continues to advance steadily.
Additionally, the two completed steam generators—key components that transfer heat from the reactor to produce steam—have been formally handed over for unit 2, with plans to ship the remaining two in 2026. These steam generators, each about 25 meters tall and weighing approximately 520 tonnes, play a pivotal role in converting nuclear heat into electricity. The very first steam generator arrived at the site in May 2024 after a combined sea and land journey and was installed in July for unit 1.
Construction of Hinkley Point C’s two EPR reactors began in late 2018 for the first unit and a year later for the second. Recently, the dome of unit 1 was installed in December 2023, while the dome of unit 2 was placed just last week. The project has faced some cost revisions, with the initial estimate of GBP 26 billion (around USD 32.8 billion) rising to between GBP 31-34 billion—highlighting the enormous investment and complexity involved.
Once fully operational, these two reactors—each capable of generating 1,630 MWe—are projected to produce enough carbon-free electricity to power six million homes. The expected lifespan of these reactors could extend up to 80 years, marking a significant stride toward a sustainable energy future—and sparking many debates about project costs, safety, and environmental impact. What are your thoughts on this impressive but costly leap into nuclear energy? Do you believe the benefits outweigh the risks? Share your opinions below!
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