**1. NAME AND TITLE**

SUSD: Cross Section Sensitivity and Uncertainty Analysis Including Secondary Neutron
Energy and Angular Distributions.

**2. CONTRIBUTOR**S

University of Tokyo, Tokyo, Japan.

NEA Data Bank, Gif-sur-Yvette Cedex, France.

**3. CODING LANGUAGE AND COMPUTER**

Fortran 77; HITACHI-M Series (A), IBM 3090 and VAX 8810 (B).

**4. NATURE OF PROBLEM SOLVED**

SUSD calculates sensitivity coefficients for one- and two-dimensional transport problems.
Variance and standard deviation of detector responses or design parameters can be obtained using
cross-section covariance matrices. In neutron transport problems, this code can perform sensitivity-uncertainty analysis for secondary angular distribution (SAD) or secondary energy distribution (SED).

**5. METHOD OF SOLUTION**

SUSD uses first order perturbation theory to calculate sensitivity coefficients. The system includes
additional modules for the PSR-171/NJOY system to prepare partial cross sections for SAD sensitivity
analysis (GROUPSR) and group covariance matrices for SAD/SED uncertainty analysis (SEADR).

**6. RESTRICTIONS OR LIMITATIONS**

None noted.

**7. TYPICAL RUNNING TIME**

Each code ran in less than a second at NEADB on the IBM 3090.

**8. COMPUTER HARDWARE REQUIREMENTS**

SUSD is operable on the HITACHI M-150 H computer, IBM 3090 and VAX 8810.

**9. COMPUTER SOFTWARE REQUIREMENTS**

A Fortran 77 compiler is necessary to compile the source. On the IBM 3090, VS Fortran 2.1.1
was used under the MVS/XA operating system. On the VAX 8810, VAX Fortran 5.0-1 was used
under the VMS operating system.

**10. REFERENCE**

K. Furuta, Y. Oka, S. Kondo, "SUSD: A Computer Code for Cross-Section Sensitivity and
Uncertainty Analysis Including Secondary Neutron Energy and Angular Distributions," ORNL/TR-88/18 (November 1988).

**11. CONTENTS OF CODE PACKAGE**

Included are the referenced document and one (1.2MB) DOS diskette which contains the source
code and sample problem input and output.

**12. DATE OF ABSTRACT**

December 1988; March 1991.

**KEYWORDS: ** ADJOINT, DISCRETE ORDINATES; MULTIGROUP; NEUTRON;
SENSITIVITY ANALYSIS; PERTURBATION THEORY