Analysis of radiant heat transfer in a BWR fuel assembly |
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Authors: | M Naitoh R Kawabe K Chino |
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Affiliation: | Hitachi Research Laboratory, Hitachi Ltd., Hitachi-shi, Ibaraki, 317, Japan |
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Abstract: | A computer code ‘CIDER’ was developed which analyzes radiant heat transfer in a BWR fuel rod bundle under loss of coolant conditions. In the code, (1) a channel box and fuel rods are considered to be gray bodies, (2) reflection and absorption of radiation beams in the atmosphere is neglected, (3) a fuel rod is approximated by a regular polygonal rod, and (4) radiant heat flux is calculated considering circumferential temperature distribution on each fuel rod surface, which is determined from radial and circumferential heat conduction calculations in a fuel rod. It was found that the conventional model with uniform cladding temperature overestimated heat flux about 30% in a typical situation, or correspondingly underestimated the temperature rises. |
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