Spotlight
Kairos
Project Overview
The U.S. Nuclear Regulatory Commission (NRC) is currenlty engaged in pre-application activities with Kairos Power starting in November 2018. Kairos Power is an Alameda, CA company designing a fluoride salt-cooled high temperature reactor (FHR) using Triso-coated particle fuel in a pebble bed configuration.
For more information, please see the Kairos pre-application documents (NRC Docket 99902069).
To subscribe to the Kairos Fluoride Salt-Cooled High Temperature Reactor (FHR) email service, select Kairos Power FHR from the Advanced Reactors list after entering your email into the GovDelivery system.
For information related to the NRC staff’s review of Kairos’ Hermes testing facility, please see the Hermes review webpage.
For information related to the NRC staff’s review of Kairos’ Hermes 2 testing facility, please see the Hermes 2 review webpage.
Pre-Application Activities
Product | Type | Reference | Status |
Principal Design Criteria (PDC) for the Kairos Power Fluoride Salt-Cooled, High Temperature Reactor (KP-TR-003) | Topical Report | Feedback Provided | |
Regulatory Analysis for the Kairos Power Fluoride Salt-Cooled High Temperature Reactor (KP-TR-004) | Topical Report | Feedback Provided | |
Reactor Coolant for the Kairos Power Fluoride Salt-Cooled High Temperature Reactor (KP-TR-005) | Topical Report | Feedback Provided | |
Scaling Methodology for the Kairos Power Testing Program (KP-TR-006) | Topical Report | Feedback Provided | |
KP-FHR Risk-Informed Performance-Based Licensing Basis Development (LMP) Methodology (KP-TR-009) | Topical Report | Feedback Provided | |
KP-FHR Fuel Performance Methodology (KP-TR-010) | Topical Report | Feedback Provided | |
Metallic Materials Qualification, Rev. 4 (KP-TR-013) | Topical Report | Feedback Provided | |
Kairos Quality Assurance Program (KP-TR-007) | Topical Report | Feedback | |
Fuel Qualification Methodology (KP-TR-011) | Topical Report | Feedback | |
KP-FHR Mechanistic Source Term Methodology (KP-TR-012) | Topical Report | Feedback Provided | |
Graphite Materials Qualification, Rev. 4 (KP-TR-014-NP) | Topical Report | Feedback Provided | |
Instrument Setpoint Methodology for the Kairos Power Fluoride Salt‐Cooled High Temperature Reactor (KP‐TR‐021‐NP) | Topical Report | Feedback Provided | |
Safeguards Information (SGI) Protection Plan | SGI Plan Approval Request | Feedback Provided ML23268A009 | |
KP-FHR Core Design and Analysis Methodology Topical Report (KP-TP-024-NP) | Topical Report | Feedback Provided ML25206A363 | |
Safety Analysis Methodology for the Kairos Power Fluoride Salt-Cooled High-Temperature Test Reactor (KP-TP-020-NP) | Topical Report | Under Review | |
Basic Component Definition for the Hermes Non-Power Test Reactors | White Paper | Feedback Provided | |
Operator Training and Testing Program for the Non-Power Kairos Power Fluoride Salt-Cooled High-Temperature Reactors | Topical Report | Under Review | |
Kairos Power LLC 10 CFR 55 Exemption Requests for Non-Power Kairos Power Fluoride Salt-Cooled, High Temperature Reactors | Exemption | Under Review |
Contacts
Contacts for the Kairos Power FHR Pre-Application Review | |
|---|---|
Lead Project Manager | |
Contact a Public Affairs Officer | |
Page Last Reviewed/Updated Thursday, December 11, 2025
Page Last Reviewed/Updated Thursday, December 11, 2025