Accession Number : AD0444254


Title :   RE-ENTRY BURN-UP MODEL FOR A HYDRIDED ZIRCONIUMURANIUM FUEL ELEMENT


Descriptive Note : Final rept.,


Corporate Author : GENERAL TECHNOLOGIES CORP SPRINGFIELD VA


Personal Author(s) : Childers, H M ; McCandless, L C ; Jacobs, H S


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/444254.pdf


Report Date : Jun 1964


Pagination or Media Count : 107


Abstract : The problem of describing the re-entry behavior of a hydrided zirconium-uranium fuel element of the SNAP 2 and 10A variety in an analytical form suitable for computer application is studied with special emphasis placed on the chemical interactions of the fuel with the re-entry environment. General re-entry equations are presented. The trajectory and angular-motion equations are written in a form that includes effects from transpiration cooling, heats of fusion, evaporation, dissociation, recombination, chemical reactions, and mass accretion (or loss). All pertinent parameters are evaluated insofar as available data will permit. The rate of H transpiration, the heat energy added to the fuel element due to recombination of the transpired H, and the vapor pressure of molten fuel material could not be determined with reasonable accuracy from the available data. It is recommended that these three parameters be determined through laboratory experiments and used in the model described to determine whether or not the fuel elements will burn up during re-entry.


Descriptors :   *REACTOR FUEL RODS , REACTOR FUEL ELEMENTS , ZIRCONIUM COMPOUNDS , ATMOSPHERE ENTRY , X RAY DIFFRACTION , COMBUSTION , OXIDATION , ARTIFICIAL SATELLITES , TRAJECTORIES , FILM COOLING , URANIUM , URANIUM ALLOYS , ZIRCONIUM ALLOYS , ABLATION , HYDRIDES


Subject Categories : Fission Reactor Materials


Distribution Statement : APPROVED FOR PUBLIC RELEASE