Accession Number : ADA321605

Title :   Axial Heat Distribution in Brookhaven Reactor,

Corporate Author : BROOKHAVEN NATIONAL LAB UPTON NY

Personal Author(s) : Clark, Melville, Jr

PDF Url : ADA321605

Report Date : JUL 1951

Pagination or Media Count : 23

Abstract : The axial temperature distribution is calculated in a pile with a central air gap. The effect of various geometrical and thermal constants on this distribution is presented, and a tabular summary is presented. The coefficient of heat transfer to the air and the specific heat of the air are the most important parameters. The fraction of heat generated in, and the heat conducted or radiated to, the graphite and the consideration of the actual flux distribution are of secondary importance. The thermal conductivity of graphite and the heat transferred to the gap are of negligible importance. The air temperature in all cases can be computed just as well from the simple theory as from the more elaborate one. The temperatures of the fuel elements, the air and the graphite at the plenum end are all very nearly equal, and the elaborate and simple theories lead to essentially the same result for this temperature. For the Brookhaven reactor at 28-Mw power, the elaborate theory predicts the fuel element temperature at the gap to be some 20 deg C lower and the graphite temperature to be some 40 deg C higher than does the simple theory. These differences gradually vanish as one moves along toward the plenum chamber. Finally, an attempt is made to compare theory and experiment. The agreement is poor because of experimental difficulties and a theoretical difficulty as explained in the final section, Numerical Results and Conclusions.

Descriptors :   *THERMAL CONDUCTIVITY, *HEAT TRANSFER COEFFICIENTS, *GRAPHITE MODERATED REACTORS, GRAPHITE, HEAT FLUX, CONDUCTION(HEAT TRANSFER), SPECIFIC HEAT, AIR COOLED, AIR GAPS, PLENUM CHAMBERS, REACTOR FUEL ELEMENTS.

Subject Categories : Nuclear Fission Reactors(power)
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE