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.

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
Regulatory Analysis for the Kairos Power Fluoride Salt-Cooled High Temperature Reactor (KP-TR-004) Topical Report ML22018A161 Feedback Provided
Reactor Coolant for the Kairos Power Fluoride Salt-Cooled High Temperature Reactor (KP-TR-005) Topical Report ML20016A486 Feedback Provided
Scaling Methodology for the Kairos Power Testing Program (KP-TR-006) Topical Report ML19357A252 Feedback Provided
KP-FHR Risk-Informed Performance-Based Licensing Basis Development (LMP) Methodology (KP-TR-009) Topical Report ML20101P623 Feedback Provided
KP-FHR Fuel Performance Methodology (KP-TR-010) Topical Report ML21162A349 Feedback Provided
Metallic Materials Qualification (KP-TR-013) Topical Report ML22116A249 Under Review
Kairos Quality Assurance Program (KP-TR-007) Topical Report ML21117A046 Feedback
Fuel Qualification Methodology (KP-TR-011) Topical Report ML22186A215 Feedback
KP-FHR Mechanistic Source Term Methodology (KP-TR-012) Topical Report ML22088A228 Feedback Provided
Graphite Materials Qualification (KP-TR-014-NP) Topical Report ML22132A205 Under Review

Page Last Reviewed/Updated Tuesday, March 21, 2023