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Hub AI
Energy Multiplier Module AI simulator
(@Energy Multiplier Module_simulator)
Hub AI
Energy Multiplier Module AI simulator
(@Energy Multiplier Module_simulator)
Energy Multiplier Module
The Energy Multiplier Module (EM² or EM squared) is a nuclear fission power reactor under development by General Atomics. It is a fast-neutron version of the Gas Turbine Modular Helium Reactor (GT-MHR) and is capable of converting spent nuclear fuel into electricity and industrial process heat.
EM2 is an advanced modular reactor expected to produce 265 MWe (500 MWth) of power with evaporative cooling (240 MWe with dry cooling) at a core outlet temperature of 850 °C (1,600 °F). The reactor will be fully enclosed in an underground containment structure for 30 years without requiring refueling. EM2 differs from current reactors in that it does not use water coolant but is instead a gas-cooled fast reactor, which uses helium as a coolant for an additional level of safety. The reactor uses a composite of silicon carbide as a fuel cladding material and zirconium silicide as neutron reflector material. The reactor unit is coupled to direct-drive helium closed-cycle gas turbine which drives a generator to produce electricity.
The nuclear core design is based upon a new conversion technique in which an initial "starter" section of the core provides the neutrons to convert fertile material (used nuclear fuel, thorium, or depleted uranium) into burnable fissile fuel. First generation EM2 units use enriched uranium starters (approximately 15 percent U235) to initiate the conversion process. The starter U235 is consumed as the fertile material is converted to fissile fuel. The core life expectancy is approximately 30 years without refueling or reshuffling the fuel.
Substantial amounts of usable fissile material remain in the EM2 core at the end of life. This material can be reused as the starter for the second generation of EM2s, without conventional nuclear reprocessing. There is no separation of individual heavy metals required and no additional enriched uranium needed. Only fission products would be removed, which would decay to near-background radiation levels in about 500 years compared to conventional spent fuel, which requires about 10,000 years.
All EM2 heavy metal discharges could be recycled into new EM2 units, effectively closing the nuclear fuel cycle, which minimizes nuclear proliferation risks and the need for long-term repositories to secure nuclear materials.
EM2 power costs are expected to be lower due to high power conversion (from thermal input to electric output) efficiency, a reduced number of components, and long core life. EM2 is expected to achieve a thermal efficiency of above 50% due to its high core outlet temperature and closed Brayton power cycle. The Brayton cycle eliminates many expensive components, including steam generators, pressurizers, condensers, and feedwater pumps. The design would utilize only 1/6th of the nuclear concrete of a conventional light water reactor.
Each module can be manufactured in either U.S. domestic or foreign facilities using replacement parts manufacturing and supply chain management with large components shipped by commercial truck or rail to a site for final assembly, where it will be fully enclosed in an underground containment structure. Dry cooling capability allows siting in locations without a source of cooling water.
If the reactor is to become part of a hydrogen economy, the coolant outlet temperature of 850 °C would allow the sulfur iodine cycle to be used which directly converts thermal energy into hydrogen (without electric or other intermediate steps) with an overall thermal efficiency around 50%.
Energy Multiplier Module
The Energy Multiplier Module (EM² or EM squared) is a nuclear fission power reactor under development by General Atomics. It is a fast-neutron version of the Gas Turbine Modular Helium Reactor (GT-MHR) and is capable of converting spent nuclear fuel into electricity and industrial process heat.
EM2 is an advanced modular reactor expected to produce 265 MWe (500 MWth) of power with evaporative cooling (240 MWe with dry cooling) at a core outlet temperature of 850 °C (1,600 °F). The reactor will be fully enclosed in an underground containment structure for 30 years without requiring refueling. EM2 differs from current reactors in that it does not use water coolant but is instead a gas-cooled fast reactor, which uses helium as a coolant for an additional level of safety. The reactor uses a composite of silicon carbide as a fuel cladding material and zirconium silicide as neutron reflector material. The reactor unit is coupled to direct-drive helium closed-cycle gas turbine which drives a generator to produce electricity.
The nuclear core design is based upon a new conversion technique in which an initial "starter" section of the core provides the neutrons to convert fertile material (used nuclear fuel, thorium, or depleted uranium) into burnable fissile fuel. First generation EM2 units use enriched uranium starters (approximately 15 percent U235) to initiate the conversion process. The starter U235 is consumed as the fertile material is converted to fissile fuel. The core life expectancy is approximately 30 years without refueling or reshuffling the fuel.
Substantial amounts of usable fissile material remain in the EM2 core at the end of life. This material can be reused as the starter for the second generation of EM2s, without conventional nuclear reprocessing. There is no separation of individual heavy metals required and no additional enriched uranium needed. Only fission products would be removed, which would decay to near-background radiation levels in about 500 years compared to conventional spent fuel, which requires about 10,000 years.
All EM2 heavy metal discharges could be recycled into new EM2 units, effectively closing the nuclear fuel cycle, which minimizes nuclear proliferation risks and the need for long-term repositories to secure nuclear materials.
EM2 power costs are expected to be lower due to high power conversion (from thermal input to electric output) efficiency, a reduced number of components, and long core life. EM2 is expected to achieve a thermal efficiency of above 50% due to its high core outlet temperature and closed Brayton power cycle. The Brayton cycle eliminates many expensive components, including steam generators, pressurizers, condensers, and feedwater pumps. The design would utilize only 1/6th of the nuclear concrete of a conventional light water reactor.
Each module can be manufactured in either U.S. domestic or foreign facilities using replacement parts manufacturing and supply chain management with large components shipped by commercial truck or rail to a site for final assembly, where it will be fully enclosed in an underground containment structure. Dry cooling capability allows siting in locations without a source of cooling water.
If the reactor is to become part of a hydrogen economy, the coolant outlet temperature of 850 °C would allow the sulfur iodine cycle to be used which directly converts thermal energy into hydrogen (without electric or other intermediate steps) with an overall thermal efficiency around 50%.