| 摘要 |
<p>A gas-cooled nuclear reactor comprises a pebble-bed of spherical fuel elements, which are continuously removed from the reactor, and depending upon their degree of burn-up, are replaced, the pebble-bed active core is surrounded by a side reflector, the inner-most layer of which adjacent to the active core, is also composed of spherical elements which are removed continuously or intermittently and replaced. This inner layer of the side reflector consists of spherical elements of approximately by the same size as those of the active core and, in addn. of smaller spherical elements pref. having a dia. of 0.15-0.2 times that of the larger reflector elements. Due to the higher compaction factor attained by the use of different sizes of spherical elements, improve reflecting capacity is attained and the quantity of reflector material required is reduced.</p> |
