Coolability of UO2 debris beds in pressurized water pools: DCC-1 and DCC-2 experiment results

Pressure drops of single/two-phase flows through porous beds with multi-sizes spheres and sands particles

“…Both beds are the simulation bed of DCC-2 test (Reed et al, 1986) which was an in-pile experiment performed at Sandia National Laboratories using deep UO 2 rubbles fission-heated in the Annular Core Research Reactor (ACRR). The results show that the effective diameter of non-spherical or irregular particles bed can be derived on the basis of bed consisting of spheres with the similar size distribution, and the particles shapes do not have appreciable influence on its effective diameter.…”

“…Hereafter the effective diameter will be used for selection and validation of the correlations predicting pressure drop of two phase flow. Table 3 lists the effective diameters and porosities of three beds which are DCC-2 (Reed et al, 1986), Bed-2 with multi-size spheres and Bed-3 with sands particles, since they have the similar size distribution among three beds. It can be seen from Table 3 that only slight difference exists in the effective diameters of three beds, which is probably due to the presence of particles shape or small-size (<0.7 mm) particles among them.…”

“…For comparison, the predictions of Ergun equation with DCC-2 bed are also plotted in Fig. 6, where the porosity and effective diameter are 0.41 and 1.42 mm separately (Reed et al, 1986), see the dash curves. Hereafter the effective diameter will be used for selection and validation of the correlations predicting pressure drop of two phase flow.…”

“…The emphasis of present study is placed on quantification of the effective particle diameter of particulate beds packed with multi-diameter spheres and sands particles with a size distribution from DCC-2 tests (Reed et al, 1986) respectively. Pressure drops are measured for water/air flow through the packed beds, and the effective particle diameter is obtained based on the pressure gradient and Ergun's equation.…”

“…Bed-2 and Bed-3 are the simulation bed of DCC-2 test (Reed et al, 1986) which was an in-pile experiment performed at Sandia National Laboratories using deep UO 2 rubbles fission-heated in the Annular Core Research Reactor (ACRR). The particles size distribution of Bed-2 and Bed-3 are plotted in Fig.…”