Seaborg 100 MWe Molten Salt Reactor would fit on a regular truck and burn nuclear waste

Seaborg is the largest reactor design start-up in Europe. They have a design for a molten salt reactor that is ten times smaller than the Terrestrial Energy IMSR. It would 20 to 30 times smaller than an existing pressure water nuclear reactor for submarines.

Seaborg CUBE reactor can use spent nuclear fuel (SNF) by adding thorium as a catalyst. The CUBE as a waste burner. Current conventional reactors use about 4% of the uranium fuel rods. This is because they use Uranium 235 and cannot use the Uranium 238.

The IAEA (International Atomic Energy Association) examined the Seaborg reactor designs along with many other small modular nuclear reactor designs.

250 MW Thermal for 100 MW of electricity,

The fits it a half-length 20 foot shipping container
35 ton MSR Game changer in SMR-MSR size:
cuboid of 2.4 meters by 2.4 meters x 6 meters, and 30 tons Development

Timeline aligned with standard IAEA reactor development method
• 2014-2016: Pre-conceptual Design Phase 1
• 2017-2018: Pre-conceptual Design Phase 2; 1.5 Million Euros
• 2019-2020: Conceptual Design Phase; 10 Million Euros
• 2021-2024 Technical Design Phase; 50 Million Euros
• Ready to build reactor blueprints

Delivered cost for 250 MW thermal MSR in 2025 in the $50 Million to $70 Million depending upon manufacturing scale. They are working towards a 50 MW thermal pilot plant and then would scale to 250 MW thermal for a commercial system.

Factory Serial Production

Seaborg’s solution is to innovate on cost in several dimensions:

• Safety-by-physics
• Simpler, compact design
• Serial production
• Low grid integration costs
• Low running costs

The CMSR reactor can provide industrial heat and heat for desalination of water

This versatility equates to an immense, global potential.
• Base-load electricity production
• Load following in electrical grids with variable
renewable energy
• Combined electricity and district heating
• Combined electricity and desalination
• Stand-alone, reliable electricity for remote are- as and mining operations
• High temperature heat for industrial processes, including hydrogen, ammonia and synthetic fuel production

CMSR as waste burner

The CUBE is a waste-burner it will still leave some radioactive bi-products behind. The amount of remaining waste is vastly reduced and what is left has a half-life much shorter than what was put into it. The half-life is reduced from several hundreds of thousands of years down to 20-30 years. This makes the handling of the waste much more practical, affordable, and environmentally-friendly than for conventional reactors, since no long-term storage is needed.

Safety of CMSR

The CMSR is a simple device. Whereas convention-al nuclear reactors depend on complex engineered safety systems, the CMSR relies on the laws of physics.

The ingenuity is the molten salt. By combining the fuel and coolant in a liquid salt medium, a host of benefits is derived, including:
• No pressurized water in the reactor
• Operation at atmospheric pressures
• Self-regulating temperature

This results in a transformative approach to nuclear safety by implementing safety-by-physics rather than safety-by-engineering.

The CMSR design is much simpler, and the reactor is walk-away safe.
• Retention of radioactive material within the salt
• Freeze plugs that drain the core to passively-cooled tanks in case

Reprocessing today


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