Indonesia: RSG-GAS. Profile 10

Beryllium is used as reflector material to surround the active core by an optimum reflector. Two sides of the active core are covered by two rows of beryllium elements to provide sufficient flexibility for the insertion of irradiation devices as needed. FIG. 2 shows the beryllium reflector. The other two sides of the core are connected to a beryllium block reflector specifically designed to have an optimum beam tube coupling to the core. All beryllium parts are made from nuclear grade beryllium. The beryllium elements consist of a lower end fitting which fits into the grid plate bore-holes, a square-shaped beryllium bar within a height of 683 mm and 79 mm × 75 mm outer cross section dimensions. Some of the beryllium reflector elements are provided with one bore-hole of 50 mm diameter for the insertion of irradiation samples. These elements are also suitable for the acceptance of fixed absorbers as an option for the present core design as well as for the acceptance of the start-up source. If necessary the bore holes can be filled with beryllium plugs. The position of the reflector elements can be chosen at the grid plate wherever the suitable flux level for the specific irradiation purpose exists to provide maximum flexibility for the users. Furthermore, all elements can be turned around regularly to avoid any bowing effect of the beryllium elements due to different elongation caused by swelling under radiation on different sides of the element. Only small elongation effects will occur that do not affect the intended use of the elements.