## Whirlaway: A Three-dimensional, Two-group Neutron Diffusion Code for the IBM 7090 Computer |

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9 ID a.
a. D absorption cross section Actual Tape Number adjoint calculation assumed to exist B.3 continued born in group bottom boundary boundary exists midway boundary indicator boundary plane calculation stops cards is equal cm Distance Commission convergence Eq coordinate corresponding number cross section Columns direction runs FAST FLUXII FLUXt FORTRAN fraction of neutrons if+1 IMAX input data JMAX K I I KMAX LAMDA CONVR TOT last number logical tape numbers macroscopic absorption cross macroscopic fission cross mesh increments mesh plane midway between planes neutrons produced normalization factor NU-CRITICAL number of mesh octant OPERATING INSTRUCTIONS origin to mesh point-A convergence PROBLEM FOR REPORT produced from fission Program tape region Columns REGION SPECIFICATIONS REPORT ADJOINT FAST REPORT ADJOINT SLOW REPORT FAST REPORT SLOW FLUXU Specification Cards supply a value symmetry boundary exists TOT LAMDA CONVR total number WHIRLAWAY SAMPLE PROBLEM zero-flux boundary