The preferred OBMR design was an octagonal core, which was
2930 mm in width and 8063 mm in height, and the volume of
57.4 cubic meters containing the balls of 338,542, as shown in
Fig. 2. This was a reactor with batch fuel load where the core inventory
was loaded and replaced as a whole. The top and bottom ends
of the core had flat surfaces which were differed from the conepacking
of fuel spheres in PBR, simplifying reactor physics and
thermal hydraulic designs. The inlet and outlet helium temperature
of the reactor core were 250 C and 850 C at normal operation.
These predicted data are listed in Table 1 for the purpose of
offering a further design base.