RSICC CODE PACKAGE PSR-523

1. NAME AND TITLE

DEPLETOR Version 2: Code System to Provide Depletion Capability to the U.S. NRC PARCS Code.

2. CONTRIBUTOR

Purdue University, West Lafayette, Indiana.

3. CODING LANGUAGE AND COMPUTER

Fortran 90; Sun and Personal Computers running Windows (P00523MNYCP00).

4. NATURE OF PROBLEM SOLVED

DEPLETOR provides depletion capability for the Purdue Advanced Reactor Core Simulator (PARCS), a computer code for predicting the transient behavior of light water reactor cores. PARCS solves the steady-state and time-dependent neutron diffusion equation in three-dimensional geometry to obtain the neutron flux distribution. Because PARCS solves the eigenvalue problem and is capable of performing criticality searches, it can provide the neutron flux distribution required to perform core depletion analysis. PARCS is not included in this code package.

DEPLETOR provides the following five functions:

read in the macroscopic cross sections from PMAXS, the XS file prepared by the interface code GENPXS,

calculate region wise macroscopic cross sections as a function of the history state, such as burnup, moderate density history, control rod history,

transfer the region wise macroscopic cross sections to PARCS,

obtain the region wise fluxes from PARCS,

calculate region wise history increment at each step based on fluxes.

5. METHOD OF SOLUTION

DEPLETOR generates the cross-sections at each burnup state and transfers them to PARCS, which then solves the diffusion equations with the given macroscopic cross sections and transfers the resulting flux distribution to DEPLETOR. In order to minimize the changes to the PARCS code, DEPLETOR was developed and will be maintained as a separate code. All information transfer between PARCS and DEPLETOR is performed using the standard message passing interface software PVM.

6. RESTRICTIONS OR LIMITATIONS

PVM and PARCS are not included in this distribution. PARCS is available through the U. S. Nuclear Regulatory Commission. Information on PVM can be found at: http://www.csm.ornl.gov/pvm/pvm_home.html.

7. TYPICAL RUNNING TIME

Run times vary depending on the problem and the speed of the computer.

8. COMPUTER HARDWARE REQUIREMENTS

DEPLETOR runs on personal computers running Windows and on Sun workstations.

9. COMPUTER SOFTWARE REQUIREMENTS

The code is written in Fortran 90 and has been used on Sun workstations and on Pentium computers running Windows. PVM is required for information transfer between PARCS and DEPLETOR. Executables provided by the developers using compilers listed below are included in the distribution. The PC executable was created with Compaq Visual Fortran 6.1A under Windows 2000. The Sun compiler 6.0 was used to create the Sun executable.

10. REFERENCES

a) included in documentation:

Y. Xu and T. J. Downar, "DEPLETOR: A Depletion Code for PARCS, Version 2," Informal Report Purdue University (May 2003).

b) background information:

H. Joo, D. Barber, G. Jiang, and T. Downar, "PARCS: A Multi-Dimensional Two-Group Reactor Kinetics Code Based on the Nonlinear Analytic Nodal Method," PU/NE-98-26, Purdue University (1998).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document in 10.a and the DEPLETOR source code, DEPLETOR executables for PC and Sun, makefiles and sample problem input and output. The files are transmitted in a GNU compressed Unix tar file. Windows users may extract the files using WinZIP 8.0 or newer.

12. DATE OF ABSTRACT

September 2003.

KEYWORDS: BURNUP; CROSS SECTION PROCESSING