---
title: "Antares' Mark-0 reactor receives DOE safety approval for demonstration, set to achieve criticality by July 4, 2026."
type: "News"
locale: "en"
url: "https://longbridge.com/en/news/273739578.md"
description: "Antares, a nuclear fission energy company, has received safety approval from the U.S. Department of Energy for its Mark-0 reactor's Preliminary Documented Safety Analysis. This inaugural demonstration reactor is set to achieve criticality by July 4, 2026, as part of the DOE’s Reactor Pilot Program, marking a significant advancement in microreactor development for defense and space applications."
datetime: "2026-01-26T18:53:10.000Z"
locales:
  - [zh-CN](https://longbridge.com/zh-CN/news/273739578.md)
  - [en](https://longbridge.com/en/news/273739578.md)
  - [zh-HK](https://longbridge.com/zh-HK/news/273739578.md)
generator: "portal-rs"
---

# Antares' Mark-0 reactor receives DOE safety approval for demonstration, set to achieve criticality by July 4, 2026.

Antares, a nuclear fission energy company based in Idaho Falls, has received approval from the U.S. Department of Energy (DOE) for its Preliminary Documented Safety Analysis (PDSA) concerning the Mark-0 reactor. The Mark-0 reactor is Antares' inaugural demonstration reactor, set to attain criticality by July 4, 2026, as part of the DOE’s Reactor Pilot Program. This approval marks a significant step forward for Antares in developing microreactors for defense and space applications. The DOE's certification of the PDSA paves the way for the reactor's progress.

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> **Disclaimer: This article is for reference only and does not constitute any investment advice.**