1. NAME AND TITLE OF DATA LIBRARY

ESG: 56-Group Cross Section Library Based on VITAMIN-C Generated by using SPHINX and XSDRNPM to Collapse 171 Groups.

2. NAME AND TITLE OF DATA RETRIEVAL PROGRAMS

No retrieval program is in the package.

3. CONTRIBUTOR

Oak Ridge National Laboratory, Oak Ridge, Tennessee.

4. HISTORICAL BACKGROUND AND INFORMATION

ESG, a multigroup library, is based upon space-energy self-shielding and collapse of the VITAMIN-C library.

5. APPLICATION OF THE DATA

ESG is a problem dependent self-shielded cross-section library in AMPX format. Because of the way the input was specified, there is a set of cross sections for each nuclide in the following mixtures: inner driver, outer driver, radial blanket, control channel, reflector, reactor vessel, sodium pool, graphite, and concrete.

6. SOURCE AND SCOPE OF DATA

SPHINX was used to generate self-shielding factors for the nine mixtures. The self-shielding factors were used to generate a problem-dependent self-shielded cross-section library in AMPX format. XSDRNPM was then used to do the one-dimensional transport calculation of the reference reactor. Cross sections were collapsed to the 56-group structure by using "region" weighting which produces one set of cross sections for a nuclide but weighted over a composite spectrum made up of all spectra from zones where the nuclide is present. Because of the way the input was specified, there is a set of cross sections for each nuclide in the nine mixtures listed in APPLICATION OF THE DATA, above.

The requested ANISN library included:

²³⁵U, ²³⁸U, ²³⁸Pu, ²³⁹Pu, ²⁴⁰Pu, ²⁴¹Pu, ²⁴²Pu, ¹²C, Fe, Cr, Ni, ⁵⁵Mn, Mo, Si, ²³Na, ¹⁰B, ¹¹B, ¹⁴N, ¹⁶O, Mg, N, ²⁷Al, Ca, K.

7. DISCUSSION OF THE DATA RETRIEVAL PROGRAM

Not applicable.

8. DATA FORMAT AND COMPUTER

EBCDIC card images; IBM 360.

9. TYPICAL RUNNING TIME

Not applicable.

10. REFERENCES

R. Q. Wright, "Description of Problem Dependent Shielding Cross-Section Library," Informal Note (April 1979).

E. R. Specht, "Specifications for an Updated Multigroup Shielding Library Desired by ESG," Informal Note (December 1978).

11. CONTENTS OF LIBRARY

Included are the referenced documents and one (1.2MB) DOS diskette which contains the cross sections for the 56 group library and the Fortran IV retrieval source, plus output from the sample problem.

12. DATE OF ABSTRACT

March 1985.