Newcleo installs main vessel for lead-cooled reactor demonstrator in Italy
Newcleo has installed Precursor’s main vessel at Brasimone, putting its lead-cooled test bed into the phase where whole-plant systems can be validated before any fuel is loaded.
The main vessel for Newcleo’s Precursor demonstrator has been installed at the Brasimone research centre in Italy, moving the company’s lead-cooled fast reactor program into the stage where the non-nuclear machine can start proving how the plant behaves as a system. For Newcleo, this is the first big hardware milestone in a 10-MWt pool-type test facility built to mirror a future lead-cooled reactor without using nuclear fuel.
The vessel will house the steam generators, decay-heat removal dip coolers, the inner vessel and the electrical core simulator. Newcleo designed the component with SRS Servizi di Ricerche e Sviluppo Srl, had it manufactured by Fucina Italia and worked with ENEA at the Brasimone site, where the agency has described the center as an international hub for liquid-metal technologies. The company’s 2024 corporate figures, €645 million in private funding and about €70 million in revenue, help explain why this is being treated as an industrial step rather than a laboratory curiosity.
The build-up has been visible for months. On 26 January 2026, SRS said the anchoring plate for the main vessel had arrived at Brasimone and marked the start of installation. In April, Newcleo said installation of the Precursor facility had officially begun. By 26 May, the vessel itself was in place. The next hard milestone is delivery and installation of the turbine, which will let the demonstrator move toward electricity generation and the full operating cycle Newcleo wants to validate.
That operating cycle is the point of the whole exercise. ENEA said in November 2024 that it and Newcleo were working at Brasimone to develop, by 2026, the first electrical simulator of a liquid-lead cooled reactor, with the goal of demonstrating the feasibility of safe, reliable and sustainable nuclear systems. Earlier ENEA material framed the collaboration as a non-radioactive electrical prototype meant to study thermodynamic, mechanical and functional performance. Precursor is meant to be fully representative of the plant, so engineers can test system integration, thermal-hydraulic behavior and operating concepts before a nuclear prototype is built.
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Newcleo says the demonstrator is designed to emulate the size, complexity and thermal-hydraulic performance of its LFR-AS-30 reactor design, which the company is developing for a pilot plant in France in the early 2030s. With the main vessel now installed, Brasimone has moved from staged construction into the part of the program where the machine has to start behaving like the reactor Newcleo wants to build next.
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