MYRRHA is a flexible fast spectrum pool type research reactor cooled by lead-bismuth under development at SCK CEN. Conceived as an accelerator driven system prototype, it operates in both sub-critical and critical modes. This kind of nuclear system is highly economical, has enhanced safety, produces minimal waste and is proliferation friendly. The Primary Heat eXchangers (PHX) of MYRRHA are located in the reactor pool allowing to operate a compact reactor without an intermediate loop. The most promising option for the PHX is based on the double wall bayonet tube bundle with leakage monitoring system. This innovative concept has never been tested in the nuclear technology and needs experimental assessment to cover the R&D gap. Two main experimental campaigns are foreseen at SCK CEN:
- Table Top test is aimed to estimate the global heat transfer coefficient(+/-15% error) of one reduced scale double wall bayonet tube with intermediate leak monitoring system. Three test sections will be addressed, they differ in the leak monitoring system: (O1) is with helical cavities and pressurized Helium (under construction), (O2) is with pressurized Helium (under design), (O3) is with LBE and pressurized Helium (under design).
- HEXACOM PHX test is aimed to retrieve the global heat transfer coefficient (+/- 5% error) of a full length double wall bayonet tube with intermediate leak monitoring system based on (O1).