Abstract
Abstract An analytical, two-dimensional, multi-region, multi-cell technique was developed for the thermal analysis of LMFBR rod bundles. Local temperature fields of various unit cells were obtained for seven- and nineteen-rod bundles of different geometries and power distributions. The validity of the technique was verified by its excellent agreement with the THTB calculational result. By comparing the calculated fully-developed circumferential cladding temperature distribution with those of the experimental measurements, an axial correction factor has been derived to account for the entrance effect under practical conditions. A scheme was also developed to couple the two-dimensional distributed analysis and lumped parameter calculation such that the entrance effect can be implanted into the distributed parameter analysis. The technique has demonstrated its applicability for a seven-rod bundle. The results of calculation were compared to those of three-dimensional analysis.
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