NESC0543 ZZ-THERMOS.

ZZ THERMOS, Multigroup P0 to P5 Thermal Scattering Kernels from ENDF/B Scattering Law Data

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROBLEM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS, CPU, FEATURES, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: ZZ-THERMOS

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2. COMPUTERS

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Program name	Package id	Status	Status date
ZZ-THERMOS	NESC0543/01	Tested	01-OCT-1975

Machines used:

Package ID	Orig. computer	Test computer
NESC0543/01		IBM 370 series

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3. DESCRIPTION OF PROBLEM OR FUNCTION

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  FORMAT:

  NUMBER OF GROUPS: 30-group THERMOS thermal scattering kernels

NUCLIDES: Molecular H2O, Molecular D2O, Graphite, Polyethylene, Benzene, Zr bound in ZrHx, H bound in ZrHx, Beryllium-9, Beryllium Oxide, Uranium Dioxide.

  ORIGIN: ENDF/B library

  WEIGHTING SPECTRUM: yes

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These data are 30-group THERMOS thermal scattering kernels for P0 to P5 Legendre orders for every temperature of every material from s(alpha,beta) data stored in the ENDF/B library. These scattering kernels were generated using the FLANGE2 computer code (NESC Abstract 368). To test the kernels, the integral properties of each set of kernels were determined by a precision integration of the diffusion length equation and compared to experimental measurements of these properties. In general, the agreement was very good. Details of the methods used and results obtained are contained in the reference. The scattering kernels are organized into a two volume magnetic tape library from which they may be retrieved easily for use in any 30-group THERMOS library.   The contents of  the tapes are as follows -

        Material          ZA         Temperatures (degrees K)

    Molecular H2O        100.0    296, 350, 400, 450, 500, 600,

    Molecular D2O        101.0    296, 350, 400, 450, 500, 600,

    Graphite            6000.0    296, 400, 500, 600, 700, 800,

    Polyethylene         205.0    296, 350

    Benzene              106.0    296, 350, 400, 450, 500, 600,

        Material          ZA         Temperatures (degrees K)

    Zr bound in ZrHx     203.0    296, 400, 500, 600, 700, 800,

    H bound in ZrHx      230.0    296, 400, 500, 600, 700, 800,

    Beryllium-9         4009.0    296, 400, 500, 600, 700, 800,

    Beryllium Oxide      200.0    296, 400, 500, 600, 700, 800,

    Uranium Dioxide      207.0    296, 400, 500, 600, 700, 800,

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4. METHOD OF SOLUTION

Kernel generation is performed by direct integration of the thermal scattering law data to obtain the differential scattering cross sections for each Legendre order. The integral parameter calculation is done by precision integration of the diffusion length equation for several moderator absorption cross sections followed by a least squares fit to obtain the first three moments of k**2/sigma-a as a function of sigma-a. The diffusion parameters D0, C and other integral parameters were then obtained from the fitted moments.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

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6. TYPICAL RUNNING TIME

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7. UNUSUAL FEATURES: UNUSUAL FEATURES OF THE PROGRAM

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8. RELATED AND AUXILIARY PROGRAMS

A retrieval program to print and/or punch scattering kernels from the libraries is included. Part of the routine is a general subroutine that will position a library in front of a specified kernel. The subroutine may be used in any user program.

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9. STATUS

Package ID	Status date	Status
NESC0543/01	01-OCT-1975	Tested at NEADB

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10. REFERENCES

- F. J. McCrosson, D. R. Finch, and E. C. Olsen:
Testing of ENDF/B - THERMOS Cross Sections for H2O, D2O, C, ZrH2, (C2H4)x, Be, BeO, C6H6, and UO2, DP-1276
(ENDF-158), October 1971.

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11. MACHINE REQUIREMENTS

The retrieval program requires 1 tape drive and a small amount of high-speed core.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NESC0543/01	FORTRAN-IV

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13. SOFTWARE REQUIREMENTS: OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

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15. NAME AND ESTABLISHMENT OF AUTHORS

                 F. J. McCrosson and D. R. Finch
                 Savannah River Laboratory
                 E. I. duPont de Nemours and Company
                 Aiken, South Carolina  29801

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16. MATERIAL AVAILABLE

NESC0543/01