2.2 Phenomenological Methods
47
Fig. 2.2 Snapshots of drainage pebble experiments. a Preloaded central column; b Preloaded
horizontal stripes
which is 14:122:14, and totally, 150 pebbles per minute. Under this condition, the
designed size of the central area is expected to be 440 mm wide, which is 1/5 of the
diameter of the central moderator pebble region designed in the real reactor. Because
the discharging rate was set to be the summation of the three loading rates, the total
number of pebbles remained in the vessel was approximately kept constant at any
time. However, the ratio of black and colorless pebbles in the experiment vessel was
varied gradually and finally reached a certain value, just equaling the ratio of black
and colorless pebbles loaded in the upper section. The experimental results of the
central area method are shown in Fig. 2.3.
47
Fig. 2.2 Snapshots of drainage pebble experiments. a Preloaded central column; b Preloaded
horizontal stripes
which is 14:122:14, and totally, 150 pebbles per minute. Under this condition, the
designed size of the central area is expected to be 440 mm wide, which is 1/5 of the
diameter of the central moderator pebble region designed in the real reactor. Because
the discharging rate was set to be the summation of the three loading rates, the total
number of pebbles remained in the vessel was approximately kept constant at any
time. However, the ratio of black and colorless pebbles in the experiment vessel was
varied gradually and finally reached a certain value, just equaling the ratio of black
and colorless pebbles loaded in the upper section. The experimental results of the
central area method are shown in Fig. 2.3.