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State

Design disclosed

A disclosed design is not a tested one.

Open question

What has the technology itself been shown to do, at what scale and under what conditions?

  • Not established in reviewed sources: Final design status of the Xe-100 for this plant
  • Not established in reviewed sources: Any operating Xe-100 reactor anywhere
  1. Current stateDesign disclosed20 August 2026 · Regulator issued · U.S. Nuclear Regulatory Commission (Federal Register, via govinfo.gov)

    Before: Not established in reviewed sources. Source: U.S. Nuclear Regulatory Commission (Federal Register, via govinfo.gov) ↗

  2. Earlier statementConflicting sourcesDesign disclosed4 June 2026 · Company reported · X-energy (SEC filing, Q1 2026 results presentation)

    Before: Not established in reviewed sources. Source: X-energy (SEC filing, Q1 2026 results presentation) ↗

  3. Earlier statementConflicting sourcesTesting reported4 June 2026 · Company reported · X-energy (SEC filing)

    Before: Not established in reviewed sources. Source: X-energy (SEC filing) ↗

  4. Earlier statementDesign disclosed14 May 2025 · Government record · U.S. Department of Energy, Office of Nuclear Energy

    Before: Not established in reviewed sources. Source: U.S. Department of Energy, Office of Nuclear Energy ↗

Evidence detail

Design disclosed

Plant configuration as described by the NRC: four Xe-100 reactors, 800 MW thermal

A disclosed design is not a tested one.

“The facility, designated as LMGS, would be an 800 megawatts-thermal nuclear power plant comprising four X-Energy, LLC (X-energy) Xe-100 small modular high-temperature gas-cooled reactors and associated common facilities in Calhoun County, Texas.”
Attribution
Regulator issued
Publisher
U.S. Nuclear Regulatory Commission (Federal Register, via govinfo.gov)
Dated
20 August 2026
First public disclosure
20 August 2026
State before
Not established in reviewed sources
Counterparty
U.S. Nuclear Regulatory Commission
Source read
11 November 2026

Inspect primary source: U.S. Nuclear Regulatory Commission (Federal Register, via govinfo.gov) ↗

What this does and does not establish

An exact passage match shows the source says this. It does not prove the underlying claim is true.

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