Pre-test analysis of accidental transients for ALFRED SGBT mock-up characterization

Experimental analysis of stationary and transient scenarios of alfred steam generator bayonet tube in circe-hero facility

“…Some TCs were added using the information derived from the pre-test analysis (Narcisi et al, 2018), based on the RELAP5-3D model (Narcisi et al, 2017) experimental validated using the ICE tests (Tarantino et al, 2015) and adapted for the HERO test section. As highlighted during the pre-tests, the fitting volume offers a large non-insulated surface for the heat losses; in order to quantify the heat dissipations, five TCs were added on the outer surface of the fitting volume.…”

“…At this purpose, a detailed temperature measuring system has been adopted inside the pool, as shown in Figure 3(a). Three additional TCs were set for increasing measurement points at the expected thermal stratification level, obtained with RELAP5-3D calculation during the pre-test activity (Narcisi et al, 2018). Regarding the 10 bubble tubes, six of them are connected to 3 differential pressure transmitters for measuring P: in the Venturi flow meter (inlet and throat section), between LBE free level in the pool and separator and across the lower spacer grid of the FPS.…”

“…In the framework of the SESAME Project, a set of tests has been set for CIRCE facility in HERO configuration in order to achieve experimental data relevant for the ALFRED Steam Generator (SG) (Narcisi et al, 2018). In the following, the three experimental tests are presented and the results of the experimental campaign are described.…”

Post-test simulation of a PLOFA transient test in the CIRCE-HERO facility

“…One of the main tasks of the experimental campaign is to investigate relevant three-dimensional phenomena within the LBE pool; for this purpose, 119 TCs are installed inside the pool in 9 azimuthal positions (the support rods are identified from A to I in Figure 3) and several axial levels that cover the whole height of the facility. The acquisition of LBE temperature is intensified in two sectors: at the level of the fitting volume, where large heat losses occur, and at the top level of the HS active length, where a thermal stratification phenomenon was expected (Narcisi et al, 2018).…”

“…The CIRCE-HERO nodalization scheme, developed for the pre-test calculations (Narcisi et al, 2018), was improved starting from the information obtained during the blind phase of the benchmark exercise. The MULTID modelling approach was adopted for the LBE pool and a detailed mono-dimensional nodalization scheme was developed for the primary flow path and for the secondary loop.…”