European Commissioner Opens DICE, a Dutch Test Facility for Thorizon's Waste-Burning Molten Salt Reactor

Overview

European Commissioner Wopke Hoekstra officially opened a materials-testing facility named DICE at the High Tech Campus in Eindhoven on Monday, June 1, 2026, according to the Dutch Institute for Fundamental Energy Research, the research institute that built the rig with the nuclear startup Thorizon and the Province of North Brabant. The facility is a step toward Thorizon One, a molten salt reactor the company is designing to run on a fuel that combines thorium with long-lived radioactive material recovered from existing nuclear waste.

The launch drew a European Commissioner because the project sits at the intersection of two priorities Brussels has been pushing: new nuclear capacity and a way to deal with legacy radioactive waste. “Nuclear energy must be part of the energy mix. Molten salt reactors are an important step towards stable, reliable and clean energy for Europe,” Hoekstra said, as reported by World Nuclear News. Hoekstra is the Dutch European Commissioner for Climate, Net Zero and Clean Growth, and he opened the site alongside Thorizon chief executive Kiki Lauwers, according to IO+.

What We Know

DICE is not a reactor. It is a test loop that exposes candidate reactor materials simultaneously to hot molten salt and radiation, allowing engineers to study how components degrade under conditions close to those inside an operating core, according to the Dutch Institute for Fundamental Energy Research. The institute says the rig sharply accelerates that wear: “One week of testing in DICE corresponds roughly to the full expected lifetime of a Thorizon reactor core.” Beata Tyburska-Pueschel, the institute’s RIDER group leader, described the central challenge the facility is built to probe, noting that “the reactor materials are simultaneously exposed to hot molten salt and radiation,” per the same source.

The testing at the Eindhoven site is done without nuclear fuel, with components evaluated in molten salt at high temperatures, according to IO+. That outlet reported the broader project carries a budget of 8 million euros, with the Province of North Brabant contributing 4 million euros, and that the Dutch industrial firms VDL Groep and DEMCON are involved alongside Thorizon. World Nuclear News put the total project cost at EUR 8 million and reported the remaining half is covered by the participating companies.

The reactor the work is meant to support, Thorizon One, is rated at 250 MWt and 100 MWe, with construction planned to begin around 2030, according to World Nuclear News. On its own technology page, Thorizon describes the first full-scale plant as delivering 100 MW of electricity to the end user and says molten salt “allows significantly more energy to be extracted from nuclear fuel, including from nuclear waste, while operating at low pressure for enhanced safety.” The company says its design relies on “patented fuel cartridges” that “divide the reactor core into smaller, standardized modules,” which are replaced every five to 10 years.

The waste-burning ambition is central to how the project is framed. According to World Nuclear News, “the molten salt fuel adopted by Thorizon uses a combination of long-lived elements from reprocessed used nuclear fuel and thorium,” and the reactor “will be able to recycle long-lived waste from existing nuclear facilities.” The same report places the first commercial unit, a 100 MWe Thorizon One, in the Dutch province of Zeeland by 2034, with a pre-feasibility assessment of the Borssele site completed together with the utility EPZ.

What We Don’t Know

The commercial timeline is aggressive for a reactor concept that has never been built at scale in Europe, and the milestones beyond the test rig remain forward-looking. The Dutch Institute for Fundamental Energy Research frames DICE as an early materials-qualification step rather than a demonstration of a working reactor, and the central 2034 commercial date reported by World Nuclear News depends on financing, licensing, and the demonstration phases that still lie ahead. The published materials reviewed here do not detail the regulatory approvals the project will need, nor the full cost of building Thorizon One itself, as distinct from the 8 million euro test facility.

Molten salt reactors have a long research history but no commercial operating record, and the corrosion and materials questions DICE is designed to investigate are among the reasons the technology has not yet been deployed. Whether one week in the test loop truly stands in for a full core lifetime, and whether the cartridge approach holds up under real irradiation, are precisely the open questions the new facility exists to answer.