NEA-0893 EVGRP.

EVGRP, Photo Production MultiGroup Cross-Sections Generated from ENDF/B-4

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

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1. NAME OR DESIGNATION OF PROGRAM: EVGRP.

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2. COMPUTERS

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Program name	Package id	Status	Status date
EVGRP	NEA-0893/01	Tested	18-OCT-1983

Machines used:

Package ID	Orig. computer	Test computer
NEA-0893/01	CDC CYBER 740	CDC CYBER 740

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3. DESCRIPTION OF PROBLEM OR FUNCTION

The code EVGRP has been written to process the ENDF/B photonic production data. It may be used to: 1) generate, for a given set of materials and gamma producing reactions, the photo-production cross section for each reaction.
2) Calculate, for a material or a mixture of materials: the neutron- gamma group photo-production cross sections for a given reaction set; for each neutron group, the mean number of photons produced, in each gamma group, by a neutron interaction inducing the given photo- production reactions and the other possible reactions; for each neutron group, the photon mean number produced, in each gamma group, by any neutron interaction with the target; for each neutron group, the relative abundance, in the corresponding gamma group, of each produced gamma ray.

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4. METHOD OF SOLUTION:

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:

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6. TYPICAL RUNNING TIME

NEA-DB executed the test case included in the package (NEA 0893/01) on CDC CYBER 740 in 205 seconds of CPU time.

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7. UNUSUAL FEATURES OF THE PROGRAM:

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8. RELATED AND AUXILIARY PROGRAMS:

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9. STATUS

Package ID	Status date	Status
NEA-0893/01	18-OCT-1983	Tested at NEADB

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10. REFERENCES:

NEA-0893/01, included references:

- G. Simon, R. Perrier:
  EVGRP: Un code de traitement des donnees de production photonique
  contenues dans des fichiers de format ENDF/B
  CEA-N-2258 / NEANDC(E) 226 "L" / INDC(FR) 53/L (January 1982)

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11. MACHINE REQUIREMENTS

Main storage requirements on CDC CYBER 740 are 137,400 octal words.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0893/01	FORTRAN-IV

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
NOS (CDC CYBER 740).

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

The code processes all the specified options of the 12 (multiplicities), 13 (photo production cross sections) and 15 (gamma continuous spectra) ENDF files and gives the results under an ENDF type format.

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15. NAME AND ESTABLISHMENT OF AUTHOR

Gerard Simon, Roger Perrier
CEA Centre d'Etudes de Bruyeres-le-Chatel
92 Montrouge (France)

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16. MATERIAL AVAILABLE

NEA-0893/01

File name	File description	Records
NEA0893_01.003	EVGRP INFORMATION FILE	46
NEA0893_01.004	EVGRP SOURCE (FORTRAN-4)	3377
NEA0893_01.005	EVGRP JCL	18
NEA0893_01.006	EVGRP INPUT DATA FOR TEST CASE	14
NEA0893_01.007	LIBRARY DATA (FORMATTED) TAPE 10	5337
NEA0893_01.008	EVGRP PRINTED OUTPUT OF TEST CASE	1571
NEA0893_01.009	PSEUDO FILE 13 (TAPE 33) OUTPUT	355

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17. CATEGORIES

B. Spectrum Calculations, Generation of Group Constants and Cell Problems

Keywords: ENDF/B, coupled neutron gamma cross sections, gamma radiation, group constants.