NESC0815 ALVIN

ALVIN, Diffusion and Integral Data Comparison and Sensitivity Analysis

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 AUTHORS, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: ALVIN

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2. COMPUTERS

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Program name	Package id	Status	Status date
ALVIN	NESC0815/01	Tested	13-DEC-1982

Machines used:

Package ID	Orig. computer	Test computer
NESC0815/01	CDC 7600	CDC 7600

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3. DESCRIPTION OF PROBLEM OR FUNCTION

ALVIN      analyzes       the
consistency of  a set of  differential and integral  nuclear data,
adjusts the  differential nuclear data  to improve  agreement with
integral observations,  and identifies  inconsistent data.   ALVIN
also computes  required sensitivities and related  quantities such
as sensitivity profiles.

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4. METHOD OF SOLUTION

Linear perturbation theory is used for the
sensitivity calculations. Data consistency and adjustment
computations use least squares techniques.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The          DAFT2
consistency and  adjustment subroutine  treats fully  or partially
correlated differential and integral parameters,  but only as many
as the  order of  the largest  matrix that  can be  inverted.  The
DAFT3  consistency and  adjustment  subroutine treats  arbitrarily
large differential  data sets, but  only if they  are uncorrelated
with the  integral data.   Due to the  current dimensions  of some
arrays, maxima of 75 spatial mesh points, 41 groups, and 6th order
Legendre  polynomials  are  allowed.   This   can  be  changed  by
increasing the dimensions of the LCM  arrays and the arrays in the
labeled COMMON block S1 and blank COMMON.

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6. TYPICAL RUNNING TIME

About 1 minute is required, depending on
the size of the problem. NESC executed all three sample problems
in 20 CP seconds on a CDC7600.

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7. UNUSUAL FEATURES OF THE PROGRAM

Data set consistency is
analyzed. A special algorithm is used in DAFT3 to treat
arbitrarily large data sets.

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8. RELATED AND AUXILIARY PROGRAMS:

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9. STATUS

Package ID	Status date	Status
NESC0815/01	13-DEC-1982	Tested at NEADB

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10. REFERENCES

- D.R. Harris:
Consistency Among Differential Nuclear Data and Integral
Observations
Transactions of the American Nuclear Society, Vol.18, p.340, 1974.

NESC0815/01, included references:

- D.R. Harris, W.A. Reupke and W.B. Wilson:
  Consistency among Differential Nuclear Data and Integral
  Observations: The ALVIN Code for Data Adjustement, for Sensitivity
  Calculations, and for Identification of Inconsistent Data.
  LA-5987 UC-32 and UC-34c  (Dec. 1975)

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11. MACHINE REQUIREMENTS

55,000 (octal) words of small core memory
(SCM) and 303,000 (octal) words of large core memory (LCM) are
required to execute the program.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NESC0815/01	FORTRAN-IV

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED: SCOPE.

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

ALVIN
makes use of  the CDC7600 UPDATE program to modify  the ALVIN code
for the third sample problem.  Therefore, extra programming effort
will be  necessary to implement  this problem on  machines without
the CDC UPDATE utility.

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15. NAME AND ESTABLISHMENT OF AUTHORS

   Contact       D. R. Harris
                 Department of Nuclear Engineering
                 Rensselaer Polytechnic Institute
                 Troy, New York  12181
                 W. A. Reupke and W. B. Wilson
                 Los Alamos Scientific Laboratory
                 P. O. Box 1663
                 Los Alamos, New Mexico  87545

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16. MATERIAL AVAILABLE

NESC0815/01

File name	File description	Records
NESC0815_01.003	ALVIN INFORMATION FILE	28
NESC0815_01.004	ALVIN JCL	49
NESC0815_01.005	ALVIN SOURCE PROGRAM (FORTRAN-4)	1674
NESC0815_01.006	ALVIN INPUT FOR TEST CASE 1	10
NESC0815_01.007	ALVIN INPUT FOR TEST CASE 2	10
NESC0815_01.008	ALVIN INPUT FOR TEST CASE 3	78
NESC0815_01.009	FORFLUX SYMBOLIC LIBRARY DATA	8796
NESC0815_01.010	ADJFLUX SYMBOLIC LIBRARY DATA	8796
NESC0815_01.011	CROSSEC SYMBOLIC LIBRARY DATA	2718
NESC0815_01.012	ALVIN OUTPUT OF TEST CASE 1	102
NESC0815_01.013	ALVIN OUTPUT OF TEST CASE 2	2359
NESC0815_01.014	ALVIN OUTPUT OF TEST CASE 3	1060

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17. CATEGORIES

O. Experimental Data Processing

Keywords: ENDF/B, comparative evaluations, cross sections, data analysis, least square fit, perturbation theory, sensitivity.