Hermes 2 – Kairos Application
 |
Who: |
Kairos Power LLC
|
What: |
Application for a construction permit for an advanced test reactor
|
When: |
July 14, 2023 (date of application submittal)
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Where: |
Oak Ridge, Tennessee |
Website: |
https://kairospower.com/ |
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On this page:
Project Overview
The staff of the U.S. Nuclear Regulatory Commission (NRC) is currently engaged in review activities of the Hermes 2 construction permit application. Kairos Power LLC, is a U.S. based company developing a fluoride salt cooled high temperature reactor (KP-FHR) using TRISO fuel in pebble form.
Plant Characteristic |
Description |
Reactor Type |
Two low-power test reactors to support development of Kairos Power’s fluoride salt-cooled, high-temperature reactor (KP-FHR) technology |
Containment Type |
Functional containment implemented principally by the high temperature TRISO particle fuel. The fuel utilizes a carbon matrix coated fuel particle, similar to that developed for high temperature gas-cooled reactors, in a pebble-based fuel element. (See SECY-18-0096 for a description of functional containment.) |
Power Level |
35 MWth each unit |
Fuel |
Tri-structural Isotropic (TRISO) fuel particles embedded in a carbon matrix pebble. High Assay Low Enriched Uranium (HALEU) |
Balance of Plant |
Shared steam powered conversion system (Rankine Cycle) |
All public documents related to Kairos pre-application activities may be found in ADAMS using the "Advanced Search" tab with a "Document Properties:" selection of Docket Number is equal to 99902069. All public documents related to the Hermes 2 construction permit application review after acceptance may be found with a selection of Docket Numbers are equal to 05000611 and 0500612. For additional detail, see the following related pages:
Key Milestones |
Completion Date
Actual - A
Target - T |
Application Tendered |
07/14/2023 - A |
Acceptance Review |
Acceptance Review Start |
07/17/2023 - A |
Docketing Decision Letter Issued/Acceptance Review Complete |
09/11/2023 - A |
Review Schedule Established/Schedule Letter Issued to Applicant |
10/11/2023 - T |

Public Involvement
Date |
Description |
06/28/2023 |
Public Meeting To Discuss Hermes 2 Pre-Application Engagement and Kairos Power Future Plans
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Page Last Reviewed/Updated Tuesday, September 12, 2023