The numerical analysis to asses the design of the IRIS/SPES3 EIHRS condenser has been carried out with the reference RELAP code. The RELAP code has shown an inaccuracy to predict the calculation of heat power exchange and HTCs evaluation on condenser exchanger with vertical pipes. This was put in evidence in the post-test calculation of PERSEO facility in which a tuning process on heated hydraulic diameter on condensation side was utilized, being this one the bottleneck of heat conduction train, in the order to match the experimental values of exchanged power. However this procedure brought to unrealistic HTCs values. In this work, instead of the variation of heated hydraulic diameter the parameter 'Fouling Factor' has been utilized, a multiplier of HTC, which has been calibrated on the basis of CATHARE simulation results to obtain realistic HTC values. Also this criterion is a numerical artifice because the heat exchange correlation in RELAP remain inadequate, but the results are more realistic.

Analysis of Thermal-Hydraulic Performance of IRIS/SPES3 EHRS Condenser with an Appropriate RELAP5 Model

Nitti, F.;Meloni, P.
2009-03-25

Abstract

The numerical analysis to asses the design of the IRIS/SPES3 EIHRS condenser has been carried out with the reference RELAP code. The RELAP code has shown an inaccuracy to predict the calculation of heat power exchange and HTCs evaluation on condenser exchanger with vertical pipes. This was put in evidence in the post-test calculation of PERSEO facility in which a tuning process on heated hydraulic diameter on condensation side was utilized, being this one the bottleneck of heat conduction train, in the order to match the experimental values of exchanged power. However this procedure brought to unrealistic HTCs values. In this work, instead of the variation of heated hydraulic diameter the parameter 'Fouling Factor' has been utilized, a multiplier of HTC, which has been calibrated on the basis of CATHARE simulation results to obtain realistic HTC values. Also this criterion is a numerical artifice because the heat exchange correlation in RELAP remain inadequate, but the results are more realistic.
Rapporto tecnico;Generation IV reactors;Reattori nucleari veloci;Termoidraulica dei reattori nucleari
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12079/5350
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