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SMR-300

is Safe and Secure

is Economical & Efficient

is Dependable & Reliable

is Environment-Friendly

is Clean Energy for Our Future

Safe and
Secure

Next-generation reactor with walk-away passive safety features for unconditional security

Economical and Efficient

Innovative design delivers high performance on a small footprint, with an impressive service life.

Dependable and Reliable

Technology is deployable in any region worldwide, without relying on local electric grids

Environmentally Friendly

The plant’s reliable, carbon-free energy can help nations meet their climate goals

Made in the U.S.A.

SMR-300 small modular reactor is designed and manufactured at Holtec’s Krishna P. Singh Technology Campus in Camden, New Jersey. This waterfront facility located on the Delaware River features a state-of-the-art manufacturing plant and engineering offices.

Approximate Thermal Power
(for each unit)

1000 MWth

Electrical Power
(net)

340
MWe

Design Life

80
Years

Helping the World Prosper

Over three-fourths of the earth’s land mass is semi-dark or completely dark. Electricity is essential for quality of life and powering industries. Our goal is to light up the world and spur economic growth without producing greenhouse gases.

Island Mode

SMR-300 can operate in “Island Mode”

Most nuclear plants need to shut down if there is a loss of grid power. However, SMR-300 can operate in “Island Mode” during power outages. The SMR-300 could power large load centers directly connected to the plant, such as industrial facilities and microgrids. It can also operate at low power in standby to support grid recovery.

Lean Team

SMR-300 delivers big power with a lean team

The SMR-300 is designed to generate more than 300 megawatts of electricity using a compact, two-loop system with an integrated steam generator and pressurizer. Passive safety features support safe responses during emergency conditions without immediate operator intervention. A twin-unit plant is expected to require approximately 270 employees, helping reduce operating costs compared with older nuclear facilities.

Palisades

The first SMR-300 will be built and operated at Palisades in Michigan

Holtec’s first SMR-300 units are planned for the Palisades site, where they can benefit from existing property, infrastructure, personnel and site expertise. The SMR-300 design, licensing and construction team submitted the first part of the construction and permit application to the NRC in December 2025. Preconstruction activities are expected to begin after the Palisades restart.

Economies-of-Scale

SMR-300 operates more efficiently by siting two reactors in a single plant

A two-unit SMR-300 plant can share many support systems, structures, and other facilities while maintaining separate reactors and turbines. Each unit is designed to generate approximately 340 megawatts of electricity. Sharing infrastructure reduces the amount of concrete, steel, piping, and other materials required per megawatt, helping improve the economics of small modular reactor deployment.

Containment

The SMR-300 spent fuel pool is inside containment

The SMR-300 places its spent fuel pool inside the containment structure and integrates Holtec’s proven dry fuel storage technology into the plant design. This eliminates the need for a separate fuel handling building, fuel elevator and fuel canal. The arrangement is designed to simplify fuel management and significantly reduce refueling durations.

Instrumentation and Control Platform

The SMR-300 Instrumentation & Control (I&C) platform is being designed and integrated by the Holtec SMR and Mitsubishi Electric (MELCO) teams

Holtec and Mitsubishi Electric are integrating the proven MELTAC digital instrumentation and control platform into the SMR-300. Its modular design, deterministic response times and high testability support both safety-related and non-safety applications, including the Reactor Protection System and Engineered Safety Features Actuation System. The platform is being developed through a rigorous safety-related design process.

3D Model

SMR-300 is being designed using a fully integrated SMARTPLANT 3D Model

Holtec and Hyundai Engineering & Construction are developing an integrated 3D model of the SMR-300 nuclear and turbine islands. The model includes equipment, piping, structural details, cable routing, HVAC and fire protection. Engineers, operators, designers and construction specialists can use it to review accessibility, constructability, and maintainability before construction begins.

Slide 1

The SMR-300 design includes an Ultimate Heat Sink to maximize safety

The SMR-300 includes a large annular reservoir of water inside the containment enclosure structure. This Ultimate Heat Sink provides long-term capacity for removing decay heat from the reactor core, spent fuel pool, and containment during a design-basis accident. The system draws on Holtec’s operational, maintenance and testing experience and is designed to perform throughout the plant’s 80-year life.

Slide 1

SMR-300 does not require safety-related AC power

The SMR-300’s safety systems are designed to operate without safety-related alternating-current power or emergency diesel generators. Instead, qualified lead-acid batteries support monitoring, actuation and post-accident functions for at least 72 hours. This approach reduces system complexity and supports continued safety performance without relying on external power or immediate operator intervention.

Slide 1

The SMR-300 Reactor Coolant System (RCS) is designed using a Once-Through Steam Generator (OTSG) with Integral Pressurizer (PZR)

The SMR-300 uses a two-loop reactor coolant system with two reactor coolant pumps and a single once-through steam generator. A pressurizer is integrated above the steam generator to help control reactor coolant pressure. This compact arrangement is designed to produce superheated steam while minimizing equipment, supporting reliable operation and reducing potential long-term wear mechanisms.

Slide 1

SMR-300 is designed for minimal main control room staffing

The SMR-300’s automated control and safety systems allow two units to be supervised from a shared main control room by one licensed Reactor Operator and one licensed Senior Reactor Operator during normal operation. Operators focus on monitoring plant conditions and verifying system responses. The full on-shift crew also includes a shift manager, field support supervisor, and field operators.

Slide 1

SMR-300’s major structures, systems, and components (SSCs) will be manufactured by Holtec’s U.S.-based production fleet

Holtec’s vertically integrated U.S. manufacturing network includes advanced facilities in Camden, New Jersey; Pittsburgh, Pennsylvania; and Orrville, Ohio. These ASME-certified plants can manufacture major SMR-300 components, including the reactor pressure vessel, once-through steam generator, integral pressurizer and modular nuclear island assemblies. Holtec’s current strategy supports production of two SMR-300 units annually, with future expansion planned.

Instrumentation and Control Platform

Holtec has partnered with Hyundai Engineering & Construction (HDEC) for the construction and delivery of the SMR-300

Holtec has partnered with Hyundai Engineering & Construction, a global engineering, procurement and construction contractor with more than 50 years of nuclear experience. HDEC has constructed 18 nuclear power plants in South Korea and four APR-1400 units at the Barakah site in the United Arab Emirates. Under the partnership, HDEC will support balance-of-plant design and full-scope construction.