ANALYSIS OF ASTR RADIATION HEATING IN AEROSPACE STRUCTURAL MATERIALS.
Technical rept. for 1 Oct 63-30 Sep 64,
GENERAL DYNAMICS/FORT WORTH TEX NUCLEAR AEROSPACE RESEARCH FACILITY
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The heat generated in the material used for shielding and structure constitutes an important problem associated with the use of nuclear energy in aerospace missions. The calculation of the heat generated involves the use of computer codes based on the differential energy spectra obtained by a moments-method solution of the Boltzmann transport equation. The solution yields a modified spectrum at a specified point from a given source point after penetration of a multilayer shield. A summation of the spectra from all the source points gives the total spectrum. Integration of the spectrum over energy, with the use of the proper energy-absorption coefficients, gives the heat deposition rate in the test materials. To evaluate the calculational methods, some typical shielding and structural materials were irradiated by the Aerospace Systems Test Reactor ASTR at the Nuclear Aerospace Research Facility NARF. The materials tested in this experiment were Inconel-X, aluminum, and 6 borated polyethylene. The difference between the calculated and measured data is less than 20 of the measured value for Inconel-X and aluminum but is larger for the borated polyethylene. Author