IBM-704 Codes for Reactivity Step Calculations (RE-126 and RE-135)Two codes were written for the IBM-704 to calculate the behavior of a reactor following a step change in reactivity, using one-group. space-independent, zero-power kinetic theory. The reactor is assumed to be running at constant level before the step is made, either at critical or subcritical conditions, with an external source. |
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01 FRACTIONAL DEVIATION 135 IF(ABSF DEV)-ABSF 17 IF(S(J)+DELTA+DC 21 DELTA 24 DELTA accuracy Assuming all delayed-neutron ASYMPTOTIC PERIOD B₁ behavior BETA CODES FOR REACTIVITY COEFFICIENTS convergence criterion DC(I DELAYED NEUTRON PARAMETERS delayed-neutron group delayed-neutron precursors DENSITY REACTOR PERIOD DENSITY TIME DERIVATIVE DERIVATIVE OF DENSITY DEVIATION FROM ASYMPTOTIC DEVIATION ITERATIONS ERROR(K extraneous source floating-point arithmetic FORMAT 9HOA CHECK FORMAT(1H GOTO7 CALCULATION IF(ABSF DEV)-ABSF PREDEV IF(DEV PREDEV IF(RHO IFACCUMULATOROVERFLOW IFACCUMULATOROVERFLOW1015 INHOUR EQUATION INPUT FOR SAMPLE involves only negative J)/SUMA J)+B keff keffißi keffo keffßin Laplace transforms N₁(s N₁(t N₂(s N₂(t negative values NEUTRON DENSITY NONEQUILIBRIUM PRECURSORS obtained P(K)=C PDOT PDOT(K PERIOD K PRECURSOR BUILDUP precursors in equilibrium PREDEV=DEV IT=IT+1 13 previous value PROMPT NEUTRON LIFETIME REACTIVITY STEP CALCULATIONS ROOTS OF INHOUR SAMPLE RE-135 PROBLEM STEP CALCULATIONS RE-126 SUMA SUMA+A U=U+BSD V=V+BDD values of sj VG EXPF WRITEOUTPUTTAPE10,43,T(K zero final reactivity λή Σ λ