March 29, 2023

The NRC Certifies First Small Nuclear Reactor Design

In a groundbreaking achievement for the future of clean energy, the U.S. Nuclear Regulatory Commission (NRC) has given its stamp of approval to the first-ever small nuclear reactor design for power plants. 

This innovative design, masterminded by Oregon-based NuScale Power, features a cutting-edge light-water reactor capable of generating an impressive 50 MW of power. This milestone certification marks a new era in the realm of nuclear energy, paving the way for safer, more efficient, and eco-friendly power generation solutions.

Vice president of marketing and communication, Diane Hughes, shares, “The U.S. Nuclear Regulatory Commission’s official certification of NuScale’s SMR design is a historic step forward toward a clean energy future, which further positions our VOYGR power plant as a near-term deployable solution for customers,’ she adds, “The certification allows utilities and other customers to reference NuScale’s approved design when applying for a combined license to build and operate a reactor. 

What Does the New Nuclear Reactor Design Promise?

This small-scale reactor module offers several advantages over traditional large-scale nuclear reactors:

1. Offsite assembly: Small modular reactors can be largely assembled offsite in a controlled environment, ensuring precision and quality control. This approach minimizes the need for extensive on-site construction and reduces the overall project timeline.

2. Scalability: The number of reactor modules in a nuclear power plant can be scaled according to the power needs of a specific region or community. NuScale’s proposed VOYGR power plants can house four, six, or 12 SMRs, generating between 200 and 924 MW of electricity. This makes SMRs a more flexible solution for power generation compared to traditional nuclear reactors, which are typically designed to generate a fixed amount of power.

3. Cost reduction: The standardized fabrication and assembly process associated with SMRs can lead to significant cost savings. By manufacturing a large number of identical reactor modules, economies of scale can be achieved, reducing the overall cost per unit of power generated.

4. Integration with renewable energy: SMRs can be used as a backup for more variable electric supply from renewable energy sources, such as wind and solar power. This can help to ensure a continuous and stable supply of electricity, even as the world transitions to a more sustainable energy mix.

What Do the Critics Say About NuScale’s Reactor Design?

One of the main selling points of SMRs is their supposed lower cost compared to traditional, larger nuclear reactors. SMRs are designed to be more affordable due to their smaller size, factory-based manufacturing, and simplified systems. However, critics argue that SMRs, including NuScale’s design, are not proving to be any cheaper or less complex to get online than traditional nuclear reactors.

David Schlissel, the director of resource planning analysis at the Institute for Energy Economics and Financial Analysis, points out that the target price for power from NuScale’s reactor has risen by 53% since last year’s estimates. According to Schlissel, this supports the notion that SMRs will not produce cheap power and will be very expensive to build.

NuScale’s Goals

NuScale’s SMR is a compact and modular nuclear reactor, making it easier to deploy and scale up or down as needed. With a height of 76 ft (23 m) and a diameter of 15 ft (4.5 m), the reactor is about a third the size of traditional reactors. This smaller size allows for easier transportation, faster construction, and lower upfront costs, making it more accessible for communities and utility companies.

The NuScale reactor uses a convection system for cooling, which eliminates the need for pumps and the associated risks of pump failure. Water heated by the fuel rods rises up through the reactor and then circulates down over a series of steam-generator tubes. 

As heat from the reactor water transfers to the steam generator, the reactor water cools and sinks, dropping to the bottom of the reactor to be heated again. Meanwhile, steam from the steam-generator tubes exits the reactor and turns an attached turbine to generate electricity.

Though the approved design is for a 50-MW reactor, NuScale’s latest iteration can generate up to 77 MW of power. This increased capacity enables utilities to generate more electricity without significantly increasing the reactor’s footprint.


As the Carbon Free Power Project moves forward, the industry will be watching closely to see how NuScale’s technology performs in the real world. If successful, this project could be a game-changer for the nuclear power industry, ushering in a new era of clean, safe, and efficient nuclear energy by 2030.

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