Safety claims begin with boundaries

Twenty-three reactor and plant-integration entries are classified without pretending that one rulebook, emergency zone, or safety claim fits every technology and mission.

23 controlled entries5 trust disciplinesJurisdiction-specificPhase 3 still pending

Safety

Identify family-specific radioactive, thermal, chemical, electrical, mechanical, cryogenic, and external hazards.

Licensing

Map the exact technology, mission, material inventory, site, and jurisdiction before naming a pathway.

Safeguards & security

Protect material, facilities, digital systems, transport, and sensitive security information.

Emergency planning

Use approved hazard and consequence evidence; never infer an emergency zone from reactor size alone.

Public claims

Say what evidence supports, name what remains unresolved, and prohibit absolute safety language.

Find a systemBranch23 entries shown

Public-Safe Classification

Family-specific safety and regulatory matrix

U.S. pathways are examples, not universal legal advice. International deployment requires the applicable national regulator and treaty obligations.

System	Branch	Safety focus	Licensing boundary	Emergency planning
Pressurized Water ReactorFIS-PWR · Light-water	Fission	Reactivity control, high-pressure primary boundary, cooling and decay-heat removal, containment, severe-accident prevention and mitigation, station power, aging management, and spent-fuel interfaces.	U.S. commercial-power reference: established 10 CFR Parts 50 and 52 licensing routes, with project-specific safety, environmental, security, emergency-planning, and operating-license findings.	Established U.S. commercial-reactor emergency-planning framework under 10 CFR 50.47 and Appendix E, coordinated with state, local, tribal, federal, and site organizations as applicable.
Boiling Water ReactorFIS-BWR · Light-water	Fission	Reactivity control, boiling-core stability, vessel and pressure-boundary integrity, cooling and decay-heat removal, containment response, severe-accident mitigation, station power, and spent-fuel interfaces.	U.S. commercial-power reference: established 10 CFR Parts 50 and 52 licensing routes, with project-specific safety, environmental, security, emergency-planning, and operating-license findings.	Established U.S. commercial-reactor emergency-planning framework under 10 CFR 50.47 and Appendix E, coordinated with state, local, tribal, federal, and site organizations as applicable.
Small Modular ReactorFIS-SMR · Deployment format	Fission	Underlying reactor hazards plus multi-module interactions, shared systems, staffing and human factors, source-term evidence, passive-feature validation, underground or compact siting, and module replacement.	U.S. advanced-power candidate: Parts 50 and 52 remain available, and the NRC issued Part 53 as an additional risk-informed, technology-inclusive pathway. The exact design, fuel, mission, and site control the route.	Eligible SMR, non-light-water, and non-power facilities may use the performance-based 10 CFR 50.160 framework. Emergency-planning scope and zone are consequence-informed and design-specific—not automatically the site boundary.
TRISO-Fueled MicroreactorFIS-TRISO-MICRO · Microreactor / coated-particle fuel	Fission	Qualified fuel performance, passive heat removal, transport and handling, remote-site staffing, tamper resistance, module retrieval, failed-unit recovery, shielding, and site restoration.	U.S. advanced-power candidate: Parts 50 and 52 remain available, and the NRC issued Part 53 as an additional risk-informed, technology-inclusive pathway. The exact design, fuel, mission, and site control the route.	Eligible SMR, non-light-water, and non-power facilities may use the performance-based 10 CFR 50.160 framework. Emergency-planning scope and zone are consequence-informed and design-specific—not automatically the site boundary.
Pebble-Bed ReactorFIS-PEBBLE · High-temperature gas-cooled	Fission	Coated-particle fuel quality, graphite temperature and oxidation, dust and contamination control, coolant ingress, fuel handling, online-refuelling interfaces, decay heat, and confinement.	U.S. advanced-power candidate: Parts 50 and 52 remain available, and the NRC issued Part 53 as an additional risk-informed, technology-inclusive pathway. The exact design, fuel, mission, and site control the route.	Eligible SMR, non-light-water, and non-power facilities may use the performance-based 10 CFR 50.160 framework. Emergency-planning scope and zone are consequence-informed and design-specific—not automatically the site boundary.
Gas-Cooled ReactorFIS-GAS · Gas-cooled	Fission	Pressure-boundary integrity, depressurization, coolant inventory, graphite oxidation where applicable, high-temperature materials, decay heat, confinement, and power-conversion interfaces.	U.S. advanced-power candidate: Parts 50 and 52 remain available, and the NRC issued Part 53 as an additional risk-informed, technology-inclusive pathway. The exact design, fuel, mission, and site control the route.	Eligible SMR, non-light-water, and non-power facilities may use the performance-based 10 CFR 50.160 framework. Emergency-planning scope and zone are consequence-informed and design-specific—not automatically the site boundary.
Molten Salt ReactorFIS-MSR · Salt-cooled or salt-fueled	Fission	Exact salt and fuel form, chemistry control, corrosion, source-term retention, off-gas, freeze/thaw behavior, decay heat, drain-system claims, inspection, cleanup, and remote maintenance.	U.S. advanced-power candidate: Parts 50 and 52 remain available, and the NRC issued Part 53 as an additional risk-informed, technology-inclusive pathway. The exact design, fuel, mission, and site control the route.	Eligible SMR, non-light-water, and non-power facilities may use the performance-based 10 CFR 50.160 framework. Emergency-planning scope and zone are consequence-informed and design-specific—not automatically the site boundary.
Sodium-Cooled Fast ReactorFIS-SFR · Fast-spectrum liquid metal	Fission	Sodium chemical reactivity and fire, decay-heat removal, opaque-coolant inspection, leak detection, fuel and core feedbacks, intermediate heat transport, maintenance, and severe-event mitigation.	U.S. advanced-power candidate: Parts 50 and 52 remain available, and the NRC issued Part 53 as an additional risk-informed, technology-inclusive pathway. The exact design, fuel, mission, and site control the route.	Eligible SMR, non-light-water, and non-power facilities may use the performance-based 10 CFR 50.160 framework. Emergency-planning scope and zone are consequence-informed and design-specific—not automatically the site boundary.
Lead-Cooled Fast ReactorFIS-LFR · Fast-spectrum heavy liquid metal	Fission	Coolant chemistry, corrosion and erosion, freezing and remelting, heavy-component loads, inspection and repair, activation products, decay heat, leakage, and fuel handling.	U.S. advanced-power candidate: Parts 50 and 52 remain available, and the NRC issued Part 53 as an additional risk-informed, technology-inclusive pathway. The exact design, fuel, mission, and site control the route.	Eligible SMR, non-light-water, and non-power facilities may use the performance-based 10 CFR 50.160 framework. Emergency-planning scope and zone are consequence-informed and design-specific—not automatically the site boundary.
Supercritical Water ReactorFIS-SCWR · Generation-IV water-cooled	Fission	Very-high-pressure and high-temperature boundary integrity, water chemistry, cladding and materials behavior, cooling transients, flow stability, isolation, and decay-heat removal.	U.S. advanced-power candidate: Parts 50 and 52 remain available, and the NRC issued Part 53 as an additional risk-informed, technology-inclusive pathway. The exact design, fuel, mission, and site control the route.	Eligible SMR, non-light-water, and non-power facilities may use the performance-based 10 CFR 50.160 framework. Emergency-planning scope and zone are consequence-informed and design-specific—not automatically the site boundary.
Transportable / Mobile ReactorFIS-MOBILE · Deployment format	Fission	Underlying reactor hazards plus transport accidents, repeated commissioning, changing site interfaces, security in transit and at temporary sites, emergency coordination, return logistics, and site restoration.	U.S. advanced-power candidate: Parts 50 and 52 remain available, and the NRC issued Part 53 as an additional risk-informed, technology-inclusive pathway. The exact design, fuel, mission, and site control the route.	Eligible SMR, non-light-water, and non-power facilities may use the performance-based 10 CFR 50.160 framework. Emergency-planning scope and zone are consequence-informed and design-specific—not automatically the site boundary.
Marine ReactorFIS-MARINE · Marine propulsion / power	Fission	Underlying reactor hazards plus collision, grounding, flooding, sinking, port operations, ship motion, marine evacuation, salvage, jurisdiction, liability, and decommissioning.	Civilian U.S. maritime reactors may use Parts 50, 52, or 53, with maritime, port, Coast Guard, environmental, transport, liability, and jurisdictional interfaces. Naval programs use a separate federal framework.	Shipboard, port, route, collision, grounding, sinking, salvage, evacuation, contamination-control, and multi-jurisdiction response planning must be integrated before deployment.
Aviation ReactorFIS-AVIATION · Historical propulsion research	Fission	Crash, fire, impact, dispersion, shielding mass, airborne maintenance, emergency landing, wreck recovery, and public exposure; no credible civilian deployment baseline is established.	Historical research category with no established civilian licensing pathway. Any revival would require a new multi-agency legal, safety, environmental, airworthiness, security, and accident-response basis.	No established civilian basis. Crash, fire, dispersed contamination, evacuation, exclusion, wreck recovery, medical response, and cross-jurisdiction command would require a new validated framework.
Space ReactorFIS-SPACE · Space power / propulsion	Fission	Launch, abort, re-entry, impact, inadvertent criticality, containment before intended operation, mission reliability, end-of-mission disposition, and multi-agency nuclear flight safety.	Not a routine terrestrial commercial-power pathway. U.S. missions require nuclear flight-safety analysis and launch authorization with NASA and other federal responsibilities defined for the mission.	Mission-specific launch, abort, re-entry, impact, recovery, contamination-control, public-information, and interagency response planning. Terrestrial reactor emergency zones are not a substitute.
Pulsed Research ReactorFIS-PULSE · Research facility	Fission	Rapid reactivity insertion, pulse limits, experiment interfaces, confinement, radiation protection, cooling between pulses, instrumentation independence, operator qualification, and emergency shutdown.	U.S. non-power research or test reactors are licensed as non-power production or utilization facilities under Part 50; facility purpose and hazard determine the application and review basis.	Eligible SMR, non-light-water, and non-power facilities may use the performance-based 10 CFR 50.160 framework. Emergency-planning scope and zone are consequence-informed and design-specific—not automatically the site boundary.
Tokamak FusionFUS-TOK · Magnetic confinement	Fusion	Magnet stored energy and quench, plasma disruptions, heat exhaust, vacuum and cryogens, tritium confinement, activated dust and components, coolant boundaries, remote maintenance, and occupational dose.	Near-term U.S. fusion systems are directed toward a Part 30 byproduct-material framework and associated regulations. Exact jurisdiction and license content depend on radioactive inventories, hazards, and facility activities.	Use a hazard- and inventory-based emergency plan under the applicable materials and facility framework. Lower accident potential cannot be translated into “no emergency plan” without an approved consequence analysis.
Stellarator FusionFUS-STE · Magnetic confinement	Fusion	Three-dimensional magnet stored energy and quench, cryogens, plasma exhaust, vacuum, tritium confinement, activated components, constrained maintenance access, coolant boundaries, and occupational dose.	Near-term U.S. fusion systems are directed toward a Part 30 byproduct-material framework and associated regulations. Exact jurisdiction and license content depend on radioactive inventories, hazards, and facility activities.	Use a hazard- and inventory-based emergency plan under the applicable materials and facility framework. Lower accident potential cannot be translated into “no emergency plan” without an approved consequence analysis.
Inertial-Confinement FusionFUS-ICF · Driver-compressed targets	Fusion	High-energy drivers, target fabrication and radioactive inventory, chamber pulses, debris and activated components, optics protection, vacuum, heat recovery, repetition, and maintenance exposure.	Near-term U.S. fusion systems are directed toward a Part 30 byproduct-material framework and associated regulations. Exact jurisdiction and license content depend on radioactive inventories, hazards, and facility activities.	Use a hazard- and inventory-based emergency plan under the applicable materials and facility framework. Lower accident potential cannot be translated into “no emergency plan” without an approved consequence analysis.
Magneto-Inertial FusionFUS-MIF · Hybrid pulsed confinement	Fusion	Pulsed electrical and mechanical energy, plasma formation and compression hardware, liners or projectiles where used, chamber fatigue, tritium inventory, activation, debris, heat recovery, and maintenance.	Near-term U.S. fusion systems are directed toward a Part 30 byproduct-material framework and associated regulations. Exact jurisdiction and license content depend on radioactive inventories, hazards, and facility activities.	Use a hazard- and inventory-based emergency plan under the applicable materials and facility framework. Lower accident potential cannot be translated into “no emergency plan” without an approved consequence analysis.
Z-Pinch and Pulsed FusionFUS-ZP · Current-driven compression	Fusion	Large pulsed-power stored energy, electrical isolation, intense radiation pulses, chamber and electrode survival, activation, debris, repetitive operation, heat recovery, and controlled access.	Near-term U.S. fusion systems are directed toward a Part 30 byproduct-material framework and associated regulations. Exact jurisdiction and license content depend on radioactive inventories, hazards, and facility activities.	Use a hazard- and inventory-based emergency plan under the applicable materials and facility framework. Lower accident potential cannot be translated into “no emergency plan” without an approved consequence analysis.
Field-Reversed Configuration / SpheromakFUS-FRC · Compact toroid	Fusion	Pulsed power, formation and sustainment hardware, magnetic stored energy, injectors, vacuum, fuel inventory, activation, heat and particle exhaust, direct-conversion claims, and maintenance.	Near-term U.S. fusion systems are directed toward a Part 30 byproduct-material framework and associated regulations. Exact jurisdiction and license content depend on radioactive inventories, hazards, and facility activities.	Use a hazard- and inventory-based emergency plan under the applicable materials and facility framework. Lower accident potential cannot be translated into “no emergency plan” without an approved consequence analysis.
Magnetic-Mirror FusionFUS-MIR · Open-ended magnetic confinement	Fusion	Open-ended plasma losses, magnets and stored energy, cryogens, high-voltage collectors where proposed, vacuum, tritium inventory, activation, shielding, heat recovery, and maintenance.	Near-term U.S. fusion systems are directed toward a Part 30 byproduct-material framework and associated regulations. Exact jurisdiction and license content depend on radioactive inventories, hazards, and facility activities.	Use a hazard- and inventory-based emergency plan under the applicable materials and facility framework. Lower accident potential cannot be translated into “no emergency plan” without an approved consequence analysis.
Fusion Power-Plant IntegrationFUS-PLANT · Cross-cutting enabling architecture	Fusion	Blanket and coolant boundaries, tritium processing and confinement, neutron shielding, activated components, heat removal, remote maintenance, hot-cell interfaces, fire protection, power conversion, and grid transients.	Near-term U.S. fusion systems are directed toward a Part 30 byproduct-material framework and associated regulations. Exact jurisdiction and license content depend on radioactive inventories, hazards, and facility activities.	Use a hazard- and inventory-based emergency plan under the applicable materials and facility framework. Lower accident potential cannot be translated into “no emergency plan” without an approved consequence analysis.

Claims Discipline

Language the public can trust

Defensible

“Conceptual public-facing architecture.”
“Design- and jurisdiction-specific review is required.”
“The listed hazards and gates are not a safety finding.”
“Fusion plasma progress does not equal net-electric plant operation.”
“Advanced fission may improve resource use without eliminating waste obligations.”

Not defensible without approved evidence

Inherently safe, zero-risk, meltdown-proof, or walk-away.
Waste-free, radiation-free, proliferation-proof, or maintenance-free.
No emergency plan, no security, or automatic site-boundary planning zone.
Licensed, commercially ready, self-sustaining, or net-electric based on a rendering or isolated milestone.
Guaranteed cost, schedule, resource, or deployment advantage.

Phase boundary: Phase 3 lifecycle, waste, recycling, activation, and end-of-life work remains pending and has not been absorbed into this safety pass.

Official Evidence

Authorities used for this classification