The HMFTF is a testing facility which will be used to produce a database of hydromechanical information to supplement the qualification of the prototypic ultrahigh density U-Mo Low Enriched Uranium fuel which will be implemented into the U.S. High Performance Research Reactors upon their conversion to low enriched fuel. 
The current design of the HMFTF permits for hydraulic testing of a single full HPRR  element, and can simulate design basis accident conditions of all the U.S. HPRRs including operation between Lower Safety System Settings to Limiting Conditions of Operation.
Because the HMFTF’s purpose is providing hydro-mechanical information, its design has been limited to subcooled isothermal testing capabilities. Many unique challenges arise when designing a thermal-hydraulic test loop having such a wide range of operating conditions including mechanical configuration and sensing arrangement.