NEA-0394 ETOA.

ETOA, ABBN MultiGroup Constants from ENDF/B for Fast Reactors

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, 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 OR MONITOR UNDER WHICH PROGRAM IS EXECUTED, ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: ETOA-2.

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2. COMPUTERS

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Program name	Package id	Status	Status date
ETOA-2	NEA-0394/02	Tested	01-OCT-1977

Machines used:

Package ID	Orig. computer	Test computer
NEA-0394/02	IBM 370 series	IBM 370 series

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3. NATURE OF PHYSICAL PROBLEM SOLVED

Production of ABBN type group constants up to 70 groups for fast reactor calculations, reading ENDF/B library as input.

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4. METHOD OF SOLUTION

The multigroup method of Bondarenko et al. is used for processing basic nuclear data. Calculational algorithms for an unresolved resonance region are the same as those in the MC**2 code. For a resolved resonance region, an ultrafine energy structure dependent on a level scheme is adopted.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maximum number of

                     energy groups - 70
                     sigma0 values - 6
                     temperatures - 5
Self-shielding factors for an unrealisticly low value of sigma0 are not guaranteed because of the approximations used in the unresolved resonance region.

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6. TYPICAL RUNNING TIME

The production of 25 group constants for FE from ENDF/B-III of infinite dilution and the table of self-shielding factors at 3 values of temperature and at 4 values of sigma0, takes 25 minutes on FACOM 230-60.

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7. UNUSUAL FEATURES OF THE PROGRAM

The output from this program is given on a tape or disk in a binary form and is compiled to a library using the JARMEC-2 code (JAERI group constants managing code), which also makes input libraries for the JAERI fast reactor calculation codes such as EXPANDA-5.

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8. RELATED AND AUXILIARY PROGRAMS

The program is an extension of the ETOA-1 code to the ENDF/B-II, ENDF/B-III and ENDF/B-IV formats with several improvements on numerical techniques. The JARMEC-2 code is used for output processing (see item 7 above).

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9. STATUS

Package ID	Status date	Status
NEA-0394/02	01-OCT-1977	Tested at NEADB

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10. REFERENCES

- 'Group Constants for Nuclear Reactor Calculations'
  Edited by I.I. Bondarenko
  Consultants Bureau (1964).
- 'Data Formats and Procedures for the ENDF Neutron Cross Section
  Library'
  Edited by M.K. Drake
  BNL 50274(T-601) (October 1970).
- B.J. Toppel, A.L. Rago, and D.M. O'Shea:
  'MC**2, A Code to Calculate Multigroup Cross Sections'
  ANL-7318 (June 1967).
- H. Nishimura:
  'JARMEC-2, A JAERI Group Constants Managing Code'
  JAERI (to be published).
- T. Suzuki and S. Katsuragi:
  'EXPANDA-5, The One-Dimensional Diffusion Equation Program for
  Fast Reactors Consisting of Two-Region Hexagonal Lattices'
  JAERI 1210 (February 1972).
- H. Nishimura:
  'ETOA-1, A Code to Calculate Group Constants For Fast Reactor
  Calculations'
  JAERI-Memo 5010 (September 1972).

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11. MACHINE REQUIREMENTS

Core storage - 120 k-words
8 tapes and/or disks (channels 1 - 4 and 8 - 11)
card reader (channel 5)
on-line printer (channel 6)
on-line punch (channel 7).

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0394/02	FORTRAN-IV

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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED: FACOM 230-60/75 monitor 6/7.

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14. ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

End of file is checked in the program, so the FORTRAN statements pertinent to this function should be converted if a CDC 6600 computer is used.

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15. NAME AND ESTABLISHMENT OF AUTHOR: Hideo Nishimura
Japan Atomic Energy Research Institute

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16. MATERIAL AVAILABLE

NEA-0394/02

File name	File description	Records
NEA0394_02.001	ETOA-2 SOURCE PROGRAM - F4 EBCDIC	8619
NEA0394_02.002	LIBRARY DATA(ENDF/B-4) - BCD	17977
NEA0394_02.003	ETOA-2 SAMPLE PROBLEM INPUT	16
NEA0394_02.004	ETOA-2 JOB CONTROL CARDS	35
NEA0394_02.005	ETOA-2 SAMPLE PROBLEM OUTPUT	2966

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17. CATEGORIES

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

Keywords: ENDF/B, fast reactors, group constants, multigroup theory, resonance, unresolved region.