Abstract
The knowledge of the magnitude and distribution of the nuclear heating in all positions of the reactor core is an essential basis for the design of irradiation facilities. The principle for determining the nuclear heating is based on the caloric method. The nuclear heating is generated in a small sample suspended in the centre of a He-filled container. Since in steady state condition, the heat generation in the sample equals the heat removal over the gas annulus, the temperature difference is related to the nuclear heating in the sample. This relation is determined by means of an appropriate calibration. Two sets of three calorimeters with different sample materials, stainless steel, aluminium and graphite, are fitted in a measuring probe, which is placed in a thimble. The probe is vertically displacable in the thimble.
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