Fluoride-salt-cooled high-temperature reactor (FHR) using British advanced gas-cooled reactor (AGR) geometry and refueling technology

Charles Forsberg, Dean Wang, Eugene Shwageraus, Brian Mays, Geoff Parks, Carolyn Coyle, Maolong Liu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


The FHR uses graphite-matrix coated-particle fuel (same as high-temperature gas-cooled reactors (HTGRs)) and a liquid salt coolant. It delivers heat to industry or the power cycle between 600 and 700°C with higher average heat delivery temperatures than any other currently deployed reactor. There are several candidate liquid salt coolants-all with melting points above 450°C. The high minimum temperatures present refueling challenges and require special features to control temperatures-avoiding excessively high temperatures and freezing of the coolant that could impact decay heat cooling systems. We describe herein an FHR design that addresses many of these challenges by adopting features from the British AGR, a proven concept where 14 reactors have operated for decades. The AGRs are carbon-dioxide cooled and graphite-moderated reactors that use cylindrical fuel assemblies with vertical refueling at 650°C-meeting FHR high-temperature refueling requirements. The AGR uses 8 cylindrical fuel sub-assemblies each a meter tall coupled together by a metal stringer to create a long fuel assembly. This geometric structure is compatible with the geometric constraints of FHR graphite-matrix coated-particle fuel. The refueling standpipes above the AGR core with modifications can be used in an FHR for refueling and a decay heat cooling system that prevents both overheating and overcooling (freezing) of the coolant during normal or abnormal conditions. The AGR-like FHR design is described.

Original languageEnglish
Title of host publicationPBNC 2018 - Pacific Basin Nuclear Conference
PublisherAmerican Nuclear Society
Number of pages12
ISBN (Electronic)9780894487743
StatePublished - 1 Jan 2019
Externally publishedYes
Event2018 Pacific Basin Nuclear Conference, PBNC 2018 - San Francisco, United States
Duration: 30 Sep 20184 Oct 2018

Publication series

NamePBNC 2018 - Pacific Basin Nuclear Conference


Conference2018 Pacific Basin Nuclear Conference, PBNC 2018
Country/TerritoryUnited States
CitySan Francisco


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