Accession Number : AD0636542


Title :   FAST NEUTRON SPECTRUM OF THE AFRRI TRIGA REACTOR.


Descriptive Note : Contract rept.


Corporate Author : GENERAL DYNAMICS CORP SAN DIEGO CALIF GENERAL ATOMIC DIV


Personal Author(s) : Profio, A. E. ; West,G. B. ; Houghton,G. K. ; Trimble,G. D.


Report Date : JAN 1966


Pagination or Media Count : 109


Abstract : The angular flux spectrum was measured in a 43 cm sphere filled with the mixture ZrH1.9O0.3Fe0.1A10.05B0.01' representing the approximate homogenized TRIGA reactor core composition (without uranium, and with boron added for thermal neutron absorption). The sphere was reflected with 5.08 cm of water. A 7.6 cm diameter depleted uranium target embedded at the center, excited by a 20 nsec pulsed electron beam for a Linac, was the neutron source for the time-of-flight experiment (50 meter flight distance). Detectors were a 5 by 5 cm liquid scintillator for spectra from 0.4-14 MeV, and a boron capture gamma ray detector for 0.1-0.5 MeV. Measurements were made at 7.6 cm penetration (0 and 51 degrees to the radius vector), at the core-reflector interface, and at the surface of the reflector (0 and 46 degrees). Calculations of the spectrum in the experimental assembly were made with the GAPLSN S sub n code in S8, with 20-group P3 cross sections from the GAM-II code. Comparisons between calculations and experiment were made to decide on the angular mesh, order of anisotropic scattering approximation, energy grouping, and cross sections for a similar calculation of the critical TRIGA reactor spectrum. Results of the calculated cylindrical geometry, P3, S8 angular flux spectrum and total leakage spectrum at the surface of the reflector are tabulated. (Author)


Descriptors :   (*REACTOR OPERATION, NEUTRON SPECTRUM), (*NEUTRON SPECTRUM, *RESEARCH REACTORS), NUCLEAR REACTORS, RADIATION HAZARDS, FAST NEUTRONS, RADIATION MEASURING INSTRUMENTS, NEUTRON FLUX


Subject Categories : NUCLEAR FISSION REACTORS(NON-POWER)
      FISSION REACTOR PHYSICS
      NUCLEAR PHYSICS & ELEMENTARY PARTICLE PHYSICS


Distribution Statement : APPROVED FOR PUBLIC RELEASE