Fusion Programme - ENEA - Fusione

Fission TechnologyPressure (bar)642GasLM00 1000 2000 3000 4000Time (ms)Fig. 8.31 - Experimental results of Test n.2S5S1-S5linkAfter the first test on LIFUS5 in 2006, the secondexperimental campaign in 2007 was devoted to exploitingthe consequences of LBE/water interaction in conditionsrepresentative of the ICE activity planned in the CIRCEfacility. The LIFUS5 facility was rearranged to reproduce asaccurately as possible a representative liquid metal pool forCIRCE and for a pool reactor. The second test consistedin injecting pressurised water at 6 bar in the LIFUS5reaction vessel containing LBE at 350°C. The mostsignificant results showed that the maximum pressureexceeded the water injection pressure and that thepressure evolution detected in the gas phase in the freelevel of the reaction vessel followed the same trend as inliquid metal (fig. 8.31).After developing the 2D geometrical model for the reactionsystem of LIFUS5 (fig. 8.32), SIMMER simulations wereperformed for tests one and two (fig. 8.33). Pre-testsimulations were used to help select the operatingconditions for the experiments, while post-test analysesallowed a better understanding of the experimental results.In general, the simulations and experimental results agreedquite well, hence proving the capability of SIMMER toreproduce the phenomenology of LBE–water interactionU tubezoneLittleplateNozzlePlatesExperimental and SIMMER results of the second test wereused to support the assessment of the accidental scenarioof a “heat exchanger tube rupture”, considered asreference accident in the safety analysis of the ICE activity.Test n. 3 should be performed at the beginning of 2009,taking into account the operating conditions chosen forthe XT-ADS steam generator.InjectordeviceS12007 Progress ReportS2-S1pipelineNocalculationzoneS2LBE Water ArgonFig. 8.32 - LIFUS5 computational domain forsimulations with SIMMERFig. 8.33 - Comparison between experimental andcalculated pressure in Test n.1Pressure (Pa)9×10 6Calculated7×10 65×10 6Experimental3×10 61×10 6 00 2 4 6 8 10 12Time (s)132