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NESC0136 HERESY-3.

HERESY, 2-D Few-Group Static Eigenvalues Calculation for Thermal Reactor

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1. NAME OR DESIGNATION OF PROGRAM:  HERESY.
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2. COMPUTERS
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Program name Package id Status Status date
HERESY-3 NESC0136/01 Tested 01-DEC-1975

Machines used:

Package ID Orig. computer Test computer
NESC0136/01 IBM 370 series IBM 370 series
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3. DESCRIPTION OF PROBLEM OR FUNCTION

HERESY3 solves the two- dimensional, few-group, static reactor eigenvalue problem using the  heterogeneous (source-sink or Feinburg-Galanin) formalism. The solution yields the reactor k-effective and absorption reaction rates for each rod normalized to the most absorptive rod in the thermal level. Epithermal fissions are allowed at each resonance level, and lattice-averaged values of thermal utilization, resonance escape probability, thermal and resonance eta values, and the fast fission factor are calculated. Kernels in the calculation are based  on age-diffusion theory. Both finite reactor lattices and infinitely repeating reactor supercells may be calculated. Rod parameters may be calculated by several internal options, and a direct interface is provided to a HAMMER system (NESC Abstract 277) lattice library tape to obtain cell parameters. Criticality searches are provided on thermal utilization, thermal eta, and axial leakage buckling.
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4. METHOD OF SOLUTION

Direct power iteration on  matrix form of the heterogeneous critical equation is used.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of

     50 flux/geometry symmetry positions
     20 physically different assemblies
      9 resonance levels
   5000 rod coordinate positions
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6. TYPICAL RUNNING TIME

Finite reactor lattice of  50 rods requires about 3 minutes, an infinite supercell of 15 rods about 2 minutes, and an axial buckling criticality search about 5 minutes.
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7. UNUSUAL FEATURES: UNUSUAL FEATURES OF THE PROGRAM
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8. RELATED AND AUXILIARY PROGRAMS

HERESY3 is interfaced to accept cell data from a HAMMER system (NESC Abstract 277) lattice library tape and calculate heterogeneous rod parameters and moderator constants directly.
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9. STATUS
Package ID Status date Status
NESC0136/01 01-DEC-1975 Tested at NEADB
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10. REFERENCES

- C.N. Klahr, L.B. Mendelsohn, and J. Heitner:
  Heterogeneous Reactor Calculation Methods.
  Final Report, NYO-2680, June 30, 1961
- C.N. Klahr, L.B. Mendelsohn, and J. Heitner:
  Heterogeneous Reactor Calculation Methods, Quarterly Progress.
  Report No. 6, NYO-2678, September 30, 1960
NESC0136/01, included references:
- D.R. Finch:
  HERESY3 Computer Code
  DP-1284 (February 1972).
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11. MACHINE REQUIREMENTS

45K  single-precision words of high speed core plus 50K single-precision words of disk (or drum) storage
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0136/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:   OS/360.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS
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15. NAME AND ESTABLISHMENT OF AUTHORS

                 D. R. Finch
                 Savannah River Laboratory
                 E. I. duPont de Nemours and Company, Inc.
                 Aiken, South Carolina  29801
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16. MATERIAL AVAILABLE
NESC0136/01
File name File description Records
NESC0136_01.001 SOURCE PROGRAM (F4) 5223
NESC0136_01.002 SAMPLE PROBLEM 1 DATA 42
NESC0136_01.003 SAMPLE PROBLEM 2 DATA 18
NESC0136_01.004 SAMPLE PROBLEM 1 PRINTED OUTPUT 475
NESC0136_01.005 SAMPLE PROBLEM 2 PRINTED OUTPUT 1172
NESC0136_01.006 JCL 13
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17. CATEGORIES
  • C. Static Design Studies

Keywords: buckling, criticality searches, heterogeneous reactors, power distribution, reactivity, reactor lattices, resonance escape probability, thermal utilization, two-dimensional.