NESC0136 HERESY-3.

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

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROBLEM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, FEATURES, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES

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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.