SPES-99 IBLOCA: RELAP5/Mod 3.2 Pre-Test and Post-Test Analysis

SPES is an experimental facility which allows the assessment of thermalhydraulic codes through the simulation of a wide range of physical phenomena characterising different accident scenarios in PWRs. The facility has full scale elevation and a volume scaling factor of about 1:400 with respect to commercial size PWRs. Water at real thermodynamic conditions is used both for the primary and the secondary circuits and the reactor full power can be simulated. In 1994 SIET performed a long experimental campaign on SPES-2 configuration giving a fundamental contribution to the AP-600 Reactor Certification Program. In 1999, in view of a possible proposal for an international cooperative programme, ENEA provided the SIET company with limited funding to restore the facility after five year of shutdown and ordered SIET a demonstration experiment where the new SPES configuration and the test conditions were selected to exploit in a valuable way the unique and outstanding characteristics of the facility. The test, defined by a working group composed of ENEA, ANPA, JRC Ispra, ANSALDO, Pisa University and SIET, consisted of a 10 equivalent break in Cold Leg, starting from full power and full pressure conditions, contermeasured only by the intervention of the accumulators. This document deals with the analysis of the comparison beween calculated results and experimental data. Moreover, it underlines the SPES facility capacbility to simulate IB-LOCAs in addition to SB-LOCAs and other kind of transients which it was designed for.