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NEA-0543 GGTC-ENEL.

GGTC-ENEL, MultiGroup Neutron Spectra in P1, B1, B2, B3 Approximation and Thermos Calculation

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1. NAME OR DESIGNATION OF PROGRAM:  GGTC-ENEL.
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2. COMPUTERS
To submit a request, click below on the link of the version you wish to order. Only liaison officers are authorised to submit online requests. Rules for requesters are available here.
Program name Package id Status Status date
GGTC-ENEL NEA-0543/02 Tested 21-SEP-1981

Machines used:

Package ID Orig. computer Test computer
NEA-0543/02 IBM 3033 IBM 3033
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3. NATURE OF PHYSICAL PROBLEM SOLVED

The GGTC-ENEL solves the same problems solved by GGC-4 code. Besides it has the possibilities relating to the availability of THERMOS (spatial spectrum calculation in slab or cylindrical one dimensional geometry).
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4. METHOD OF SOLUTION

Is the same as GGC-4 with the following improvements:
1. In the fast section (GAM-II) an advanced intermediate resonance  method has been introduced which can be used, optionally, instead of the Nordheim one.
2. In thermal section, which originally was made up only by GATHER,   an improved version of the THERMOS code has been inserted. The    most relevant improvements are:
     i) It takes into account the Doppler broadening.
    ii) An efficient use of variable dimensioning.
   iii) Improvements of iterative procedure.
3. The combining section has been widely modified to handle data  coming from THERMOS and to punch some type of data which are  directly utilizable for the input of diffusion codes (for instance SQUID and TRITON) and/or transport codes ANISN and DOT.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

See the reference report of the GGC-4 code. However the THERMOS inserted in the GGTC-ENEL has no limits on the number of spatial points, isotopes, mixtures as far as it has variable dimensioning.
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6. TYPICAL RUNNING TIME

A complex problem relating to three group cross sections of a BWR fuel element requires 19 minutes and 47 seconds of IBM 370/158. Of this time, 2 minutes and 27 seconds are required by GAM and GATHER, 17 minutes and 12 seconds for repeated cases of THERMOS and 8 seconds for combining. Note that this calculation has been carried out using, in the fast section (GAM-II) the Nordheim method.
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7. UNUSUAL FEATURES OF THE PROGRAM

Same as for GGC-4 with the advan- tages of variable dimensioning in THERMOS.
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8. RELATED AND AUXILIARY PROGRAMS

The same as GGC-4 and THERMOS. Moreover a new library maker for THERMOS named ETHEL, an acronym for ENEL THERMOS Library maker, has  been realized.  The most relevant characteristics of ETHEL are:
1. The scattering matrices can be calculated not only by means of    free gas and Nelkin models, but also the Koppel-Young model.
2. It has the possibility of considering the calculus of the  matrices relating to the isotropic scattering with a correction    of transport type.
3. Beside the generation of a new library tape, ETHEL can update an     old library tape.

SETINP: Produces a complete input data set for the code GGTC-E. It reduces considerably the work of input preparation when applied to BWRs. For example, 369 complicated input cards can be reduced to 26  much simpler cards, for a typical BWR case.
SETINP performs detailed error checks on the input cards. This feature is particularly convenient when completely automatic input preparation is not possible (no LWR or LWR with special features, etc.) SETINP requires 170k bytes of main storage on IBM 370/158 and  one peripheral unit.
NEA-0543/02
SETINP Automatic input generation for GGTC-ENEL for LWR                     bundle cases.
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9. STATUS
Package ID Status date Status
NEA-0543/02 21-SEP-1981 Tested at NEADB
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10. REFERENCES

- J. Adir and K. D. Lathrop:
Theory of Methods Used In the GGC-4 Multigroup Cross Sections Code    GA-9021 (1968).
- O. Chiovato, S. Corno and F. Di Pasquantonio:
  An Improved Intermediate Resonance Method for Heterogeneous Media  Annals of Nuclear Energy, vol. 481977, pp.91-106.
- H.C. Honeck:
  THERMOS. A Thermalization Transport Theory Code for Reactor
  Lattice Calculations
  BNL-5826.
- A. Baldacci and F. Labriola:
  Analisi dello spettro neutronico, eccetera, thesis, Universita di  Pisa (1972).
- O. Chiovato and F. Di Pasquantonio:
  A New Version of GGC Code including an Improved Intermediate
  Resonance Method and a Modified THERMOS Code
  ENEL-CRTN- N1-4 (June, 1977).
NEA-0543/02, included references:
-  E. Biscaretti, E. Brega and O. Chiovato
    New Complete How to Use of the Code GGTC-ENEL, Including the
    Facilities of Automatic Input Generation Offered by the new
    Routine SETINP.  N5/81/02  (January, 1981)
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11. MACHINE REQUIREMENTS

680 kbytes with the maximum array of THERMOS of 45,000 words.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0543/02 FORTRAN-IV
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13. SOFTWARE REQUIREMENTS: OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED
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14. ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:  See the reference report of the GGC-4.
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15. NAME AND ESTABLISHMENT OF AUTHOR

O. Chiovato                   F. Di Pasquantonio
ARS SPA                       ENEL-CRTN
Viale Maino, 35               Bastioni di Porta Volta, 10
20122 Milan (Italy)           20121 Milan (Italy)
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16. MATERIAL AVAILABLE
NEA-0543/02
File name File description Records
NEA0543_02.001 INFORMATION FILE 29
NEA0543_02.002 GAM LIBRARY 2650
NEA0543_02.003 GATHER LIBRARY 2689
NEA0543_02.004 THERMOS LIBRARY 130
NEA0543_02.005 JCL (SETINP + GGTC) 84
NEA0543_02.006 SOURCE SETINP 2456
NEA0543_02.007 INPUT SAMPLE PROBLEM 1 27
NEA0543_02.008 INPUT SAMPLE PROBLEM 2 368
NEA0543_02.009 INPUT SAMPLE PROBLEM 3 312
NEA0543_02.010 OUTPUT SAMPLE PROBLEM 1 369
NEA0543_02.011 OUTPUT SAMPLE PROBLEM 2 369
NEA0543_02.012 OUTPUT SAMPLE PROBLEM 3 369
NEA0543_02.013 SOURCE GGTC 14823
NEA0543_02.014 SUBROUTINES (LINK8,PCHCRO) 278
NEA0543_02.015 SUBROUTINE TITIME 18
NEA0543_02.016 INPUT SAMPLE PROBLEM 369
NEA0543_02.017 PUNCHED OUTPUT 160
NEA0543_02.018 PRINTED OUTPUT OF SAMPLE PROBLEM 6406
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17. CATEGORIES
  • B. Spectrum Calculations, Generation of Group Constants and Cell Problems

Keywords: Doppler broadening, cross sections, iterative methods, multigroup, neutron spectra, resonance, resonance integrals, thermal neutrons.