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Kairos

Artist rendering Kairos reactor design with the following components: fueling chute, pebble flow, pebble bed core, pebble insertion channel, defueling chute, pebble extraction machine, cover gas space, pebble insertion, reactor coolant outlet, pebble extraction, reactor coolant inlet, decay heat removal system, reactivity control and shutdown elements, core coolant outlet flow, reactor vessel, downcomer, core barrel, graphite reflector, engineered and bypass flow, and core coolant inlet


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 ML19212A756 Feedback Provided
ML20167A174
Regulatory Analysis for the Kairos Power Fluoride Salt-Cooled High Temperature Reactor (KP-TR-004) Topical Report ML22018A161 Feedback Provided
ML22159A356
Reactor Coolant for the Kairos Power Fluoride Salt-Cooled High Temperature Reactor (KP-TR-005) Topical Report ML20016A486 Feedback Provided
ML20140A147
Scaling Methodology for the Kairos Power Testing Program (KP-TR-006) Topical Report ML19357A252 Feedback Provided
ML21013A430
KP-FHR Risk-Informed Performance-Based Licensing Basis Development (LMP) Methodology (KP-TR-009) Topical Report ML20101P623 Feedback Provided
ML20328A229
KP-FHR Fuel Performance Methodology (KP-TR-010) Topical Report ML21162A349 Feedback Provided
ML22125A275
Metallic Materials Qualification, Rev. 4 (KP-TR-013) Topical Report ML23102A176 Feedback Provided
ML23062A727
Kairos Quality Assurance Program (KP-TR-007) Topical Report ML21117A046 Feedback
Provided
ML21350A347
Fuel Qualification Methodology (KP-TR-011) Topical Report ML22186A215 Feedback
Provided
ML23048A326
KP-FHR Mechanistic Source Term Methodology (KP-TR-012) Topical Report ML22088A228 Feedback Provided
ML22136A291
Graphite Materials Qualification, Rev. 4 (KP-TR-014-NP) Topical Report ML23108A314 Feedback Provided
ML23062A732
Instrument Setpoint Methodology for the Kairos Power Fluoride Salt‐Cooled High Temperature Reactor (KP‐TR‐021‐NP) Topical Report ML24102A116 Feedback Provided
ML24091A004
 
Safeguards Information (SGI) Protection Plan SGI Plan Approval Request ML23118A323 Feedback Provided ML23268A009
KP-FHR Core Design and Analysis Methodology Topical Report (KP-TP-024-NP) Topical Report ML24095A255 Under Review
Safety Analysis Methodology for the Kairos Power Fluoride Salt-Cooled High-Temperature Test Reactor (KP-TP-020-NP) Topical Report ML24156A162 Under Review
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Page Last Reviewed/Updated Monday, July 15, 2024