Technology

The NMR-50 is a 50 MWe naturally circulating small modular reactor built on proven light-water technology. Designed to deliver reliable, carbon-free power with passive safety, simplified architecture, and factory-oriented manufacturing.

Tech Specs

50 MWe

Reliable electrical output designed for utilities, industrial campuses, defense installations, and energy-intensive infrastructure.

10-Year Core

Designed for long operating cycles without routine refueling interruptions.

Walk-Away Safe

Passive safety systems designed to maintain safe operating conditions without reliance on external AC power.

Core Platform

Reactor Type
Simplified Boiling Water Reactor
Electrical Output
50 MWe
Primary Cooling
Two-Phase Natural Circulation
Fuel
Standard LEU (<5% Enrichment)
Core Life
10 Years
Reactor Pressure Vessel
~8.5 m Height × ~3.5 m Diameter
Operating Pressure
~7.2 MPa (Roughly Half of PWR-Based SMRs)

Safety

Shutdown
Fully Passive
Cooling
72+ Hour Passive Cooling
External AC
Not Required
Safety Layers
Two Independent Passive Systems

Deployment

Construction
Factory Buildable, Modular Assembly
Transport
Road Transportable
Site Footprint
<5 Acres EPZ
Operation
Digital I&C

Why Natural Circulation?

Powered by Nature

Natural circulation uses gravity and density differences to move coolant through the reactor, eliminating the need for large primary coolant pumps. By reducing active equipment and removing major vessel penetrations, the NMR-50 simplifies the plant while enhancing passive safety and long-term reliability.

0

Primary Coolant Pumps

Fewer

Active Mechanical Systems

Passive

Heat Removal

Why Light Water?

Built on Proven Nuclear Science

The NMR-50 is built on the world’s most mature reactor technology. By leveraging decades of light water reactor operational experience, an established regulatory foundation, commercially available fuel, and a domestic supply chain, MiraiGaia focuses innovation where it matters most: simplifying plant design, improving manufacturability, and accelerating deployment.

The reactor’s development has also been informed by thermal-hydraulic research performed using Purdue University’s Multi-Dimensional Integral Test Assembly (PUMA), an NRC-supported integral test facility created to investigate passive boiling water reactor safety phenomena.

Standard LEU

Commercially Available Today

The same commercial fuel used throughout today’s global light-water reactor fleet.

Mature Global Supply Chain

Decades of enrichment, fabrication, and logistics already operating at commercial scale.

Established Fabrication

Proven fuel fabrication capability supported by existing manufacturing infrastructure worldwide.

Decades of Experience

Extensive operating experience across the global light-water reactor fleet.

Fuel Comparison

NMR-50 Many Advanced Reactors
Primary Fuel Standard LEU Often HALEU or advanced fuels
Commercial Availability Available Today Supply chain still expanding
Enrichment Up to 5% Up to 20%
Existing Fuel Infrastructure Extensive Limited
Operating Experience Decades Emerging
Annual Fuel Production ~60,000,000 kg LEU ~1,000 kg HALEU