DOE adds cost-shared funding so the Molten Chloride Reactor Experiment can go critical as early as 2027

An engineer sizing a fast-spectrum molten chloride reactor today has a simulation to check the design against and no operating reactor to compare it with ^[5][6]. Jess Gehin, Idaho National Laboratory's associate laboratory director, said engineers currently rely on models to predict how this design will perform ^[6]. "Enhancing those models with real-world operating evidence will reduce uncertainty for future reactor designers and regulators," Gehin said ^[7].

The experiment's first users are the people who draw and review the design. According to Interesting Engineering, its immediate goal is scientific, not commercial ^[11], and its measurements could help developers validate simulation tools and assess engineering decisions ^[12]. Here's what teams tend to tell themselves a test reactor does: settle the design and start the commercial clock. Here's what the report describes: measurements to check models against.

The 2027 date carries a qualifier every time the report uses it. The report says operating data could arrive as early as 2027 ^[4], and CORE POWER CEO Mikal Bøe said the accelerated schedule now targets criticality as early as 2027 ^[9]. Bøe said the company committed to building MCRE in 2020 ^[9], so the earliest date is seven years on ^[14]. The report does not state the amount of the added DOE funding, the schedule it replaced, or a date for results after criticality ^[3].

For a planning meeting on Monday, we'd sort each dependency in an advanced-reactor plan with two tests. The first is whether it turns on how fuel and core behave during sustained fission. The second is whether it turns on something outside the core, such as a licence or a ship design.

Items that fail the first test and pass the second get inputs from MCRE at most, because regulators will still need project-specific safety evidence ^[8]. Each needs its own owner and its own date. Items that turn on core behavior should be marked as modeled until MCRE reports, and on the developers' own schedule that is 2027 at the earliest ^[9].