MYRRHA Primary Heat Exchanger design

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The MYRRHA (Multi-purpose hYbrid Research Reactor for High-tech Applications) facility, prototype of an Accelerator Driven System (ADS) reactor planned to be built in the SCK•CEN domain, in Mol, Belgium, in the next decade, presents several innovative and challenging objectives to be fulfilled. No electric power generation is foreseen for MYRRHA, with the 100 MWth evacuated via a two-phase water secondary system and, ultimately, through an aero-condenser system. A most important component of the reactor is the primary heat exchanger (PHX), which thermally and hydraulically connects the primary LBE pool with the secondary water loop. The secondary system conditions (temperature, pressure, mass flow rate) are supposed to stay constant at all power levels, with the primary system "following" the power variations by modifying its T/H parameters. A preliminary mechanical assessment has shown how the mechanical stresses induced by temperature gradients in the PHX tube thickness is below the allowable limits in nominal operation and accidental conditions as well. A preliminary analysis about the boiling channel instability has demonstrated how the MYRRHA PHX design does not suffer any problem coming from two-phase flow stability, and the flow behaviour remains stable under all power level and operating conditions.


Original languageEnglish
Title of host publicationWorking Material - T. M. on Innovative HX and SG design for fast reactors
Place of PublicationVienna, Austria
Publication statusPublished - Feb 2012
EventInnovative Heat Exchanger and Steam Generator Designs for Fast Reactors - International Atomic Energy Agency (IAEA), Vienna, Austria
Duration: 21 Dec 201122 Dec 2011


ConferenceInnovative Heat Exchanger and Steam Generator Designs for Fast Reactors


  • MYRRHA PHX primary heat exchanger lead fast reactor

ID: 64941