1. NAME AND TITLE OF DATA LIBRARY

E3LWR: 45 Neutron, 16 Gamma-Ray and 15 Neutron, 5 Gamma-Ray Group LWR Cross Section Libraries Derived from EURLIB-III using the AGRUKO Optimized Collapsing Scheme.

2. NAME AND TITLE OF DATA LIBRARY

No retrieval program is included in the package.

3. CONTRIBUTORS

Paul Scherrer Institute, Würenlingen, Switzerland and the OECD Nuclear Energy Data Bank, Gif-sur-Yvette, France.

4. HISTORICAL BACKGROUND AND INFORMATION

The main goals of collapsed cross section libraries are to restrict computer storage and costs to reasonable limits without introducing intolerable errors into the results. To achieve these goals, the proper and optimized selection of group boundaries and weighting spectra in the condensation procedure is the central point. In general, the selection of the weighting spectra is not difficult because they are defined by the problems to be solved.

The selection of a proper group boundary structure is less evident. Depending on the user's physical feeling or the possibilities of the data processing codes, more or less important resonance and anti-resonance details of the cross-sections are taken into account. The structure is verified a posteriori, if the errors introduced into the results are tolerable. Then the structure has to be modified, eventually.

This approach by trial and error is perhaps sufficient in simple cases with one detector response, but not in real cases with complicated particle transport environments and more than one detector type and position.

5. APPLICATION OF THE DATA

Broad group libraries have only a restricted range of applications. The DLC-98/E3LWR libraries are applicable in project design work, two-dimensional transport calculations, and cross section adjustment for LWR radiation shields. There they should show satisfactory accuracies in the target quantities as damage, activation, heating and external dose rates, and as satisfactory convergence of inner iteration schemes as used in ANISN and DOT codes.

6. SOURCE AND SCOPE OF DATA

The basic fine group library was the coupled EURLIB-3 library and, therefore, the energy range covered by the collapsed versions and their group boundaries coincide with those of the EURLIB-3 library.

Two broad group sets in 45/16 and 15/5 neutron/gamma groups (EURLIB-LWR-15/5 LIB and EURLIB-LWR-45/16 LIB) were produced in applying the automatic collapsing scheme AGRUKO to the radial PRW shielding design benchmark. The total number of groups and the group structure was selected by AGRUKO to respect required design accuracies for four of the most important response functions: pressure vessel damage, thermal activation in the inner shield, gamma heating of the concrete shield, and external neutron/gamma dose rate. Additionally, an iterative criterion was met to guarantee good convergences of inner iteration schemes as used in ANISN and DOT codes. The number of inner iterations were reduced roughly proportionally to the number of groups compared to the original 100/20 EURLIB-groups calculations.

The cross section data are produced for the 14 elements:

H, ¹²C, O, Na, Al, Si, Ca, Cr, Mn, Fe, Ni, Zr, ²³⁵U, ²³⁸U.

The maximum legendre expansion is P₃, the moments are not multiplied by the factor (2L + 1). The weighting spectra of 100/20 and 45/16 are given in the library so that the user can perform his own collapsing of the original EURLIB data set or of response functions.

7. DISCUSSION OF THE DATA RETRIEVAL PROGRAM

The RELIB program prints the elements of the library.

8. DATA FORMAT AND COMPUTER

EBCDIC card images; CDC.

9. TYPICAL RUNNING TIME

Not applicable.

10. REFERENCES

a. Included in the documentation:

V. Herrnberger, "EURLIB-LWR-45/16 and -15/5: Two Broad Group Libraries for LWR-Shielding Problems," TM-22-82-13.

V. Herrnberger and S. Padiyath, "Optimized Broad Energy Group Structures for Radiation Transport in Air and in LWR Shields," EIR-Bericht Nr. 443 (October 1981).

b. Background information:

G. Hehn and J. Korban, "Reactor Shield Benchmark No. 2," ESIS Newsletter, Special Issue No. 4 (January 1976).

E. Caglioti, et al., "Generation and Testing of the Shielding Library EURLIB for Fission and Fusion Technology," Proceedings of the Vth International Conference on Reactor Shielding, Knoxville, USA (April 1977).

W. Engle, Jr., "A Users Manual for ANISN, A One-Dimensional Discrete Ordinates Transport Code with Anisotropic Scattering," K-1693 (April 1967).

W. A. Rhoades and F. R. Mynatt, "The DOT III Two-Dimensional Discrete Ordinates Transport Code," ORNL/TM-4280 (1973).

11. CONTENTS OF LIBRARY

Included are the referenced document (10.a) and one (1.2MB) DOS diskette which contains the microscopic cross sections and the pressure vessel integrated spectra.

12. DATE OF ABSTRACT

December 1984, updated December 1989.