RSICC CODE PACKAGE CCC-702

1. NAME AND TITLE 
    ORIGEN-ARP 2.00: Isotope Generation and Depletion Code System - Matrix 
    Exponential Method with GUI and Graphics Capability.

2. CONTRIBUTOR 
    Oak Ridge National Laboratory, Oak Ridge, Tennessee.

3. CODING LANGUAGE AND COMPUTER 
    Fortran 90; PC (Pentium or later), Windows 95/NT or later (C00702PC58601).

4. NATURE OF PROBLEM SOLVED 
    ORIGEN-ARP was developed for the Nuclear Regulatory Commission and the 
    Department of Energy to satisfy a need for an easy-to-use standardized method 
    of isotope depletion/decay analysis for spent fuel, fissile material, and 
    radioactive material. It can be used to solve for spent fuel characterization, 
    isotopic inventory, radiation source terms, and decay heat.

    This release of ORIGEN-ARP is a standalone code package that contains an 
    updated version of the SCALE-4.4a ORIGEN-S code. It contains a subset of the 
    modules, data libraries, and miscellaneous utilities in SCALE-4.4a. This 
    package is intended for users who do not need the entire SCALE package. SCALE 
    users can download the components that are not distributed in SCALE 4.4a 
    (OrigenArp GUI, OPUS, and PlotOPUS) from the Download page at the SCALE web 
    site http://www.ornl.gov/scale/scale-home.html. ORIGEN-ARP has its own web 
    site at http://www.ornl.gov/origen-arp/origen-arp.html. Note that the 
    CCC-371/ORIGEN2.1 package has not been updated since 1991, and all new ORIGEN 
    users are advised to request the ORIGEN-ARP package.

    ORIGEN-ARP 2.00 (2-12-2002) differs from the previous release ORIGEN-ARP 1.0 
    (July 2001) in the following ways: 

    The neutron source and energy spectrum routines were replaced with 
    computational algorithms and data from the SOURCES-4B code (RSICC package 
    CCC-661) to provide more accurate spontaneous fission and (alpha,n) neutron 
    sources, and a delayed neutron source capability was added. 
    The printout of the fixed energy group structure photon tables was removed. 
    Gamma sources and spectra are now printed for calculations using the Master 
    Photon Library only. 

5. METHOD OF SOLUTION 
    ORIGEN-ARP is an automated sequence to perform isotopic depletion / decay 
    calculations using the ARP and ORIGEN-S codes of the SCALE system. The 
    sequence includes the OrigenArp for Windows graphical user interface (GUI) 
    that prepares input for ARP (Automated Rapid Processing) and ORIGEN-S. ARP 
    automatically interpolates cross sections for the ORIGEN-S depletion/decay 
    analysis using enrichment, burnup, and, optionally moderator density, from 
    a set of libraries generated with the SCALE SAS2 depletion sequence. Library 
    sets for four LWR fuel assembly designs (BWR 8x8, PWR 14x14, 15x15, 17x17) 
    are included. The libraries span enrichments from 1.5 to 5 wt% U-235 and 
    burnups of 0 to 60,000 MWD/MTU. Other libraries (e.g., DLC-210) are available 
    from RSICC. SCALE users can generate their own libraries for other fuel 
    assembly designs. The interpolated cross sections from ARP are passed to 
    ORIGEN-S to perform the depletion/decay calculations. The ORIGEN-ARP sequence 
    includes the post-processing utility module OPUS to generate ASCII plot data 
    files and the PlotOPUS Windows GUI to plot the data.
    ORIGEN-S uses the matrix exponential method to solve a large system of coupled, 
    linear, first-order ordinary differential equations with constant coefficients. 
    This method is supplemented by a generalized form of the Bateman equations 
    for the concentrations of short-lived nuclides.

6. RESTRICTIONS OR LIMITATIONS 
    Modeling assumptions that limit or restrict the usefulness or accuracy of 
    ORIGEN-S are discussed in the documentation.

7. TYPICAL RUNNING TIME 
    Running times are typically less than 15 seconds on a Pentium II PC or later.

8. COMPUTER HARDWARE REQUIREMENTS 
    ORIGEN-ARP runs on Pentium personal computers with a minimum of 32 MB RAM. 
    Nominal hard disk requirements are less than 50 MB for a complete installation, 
    including space for running sample problems.

9. COMPUTER SOFTWARE REQUIREMENTS 
    This system runs on Windows 95/NT or later. Fortran executables included in 
    the package were created using the Lahey F90 Fortran compiler version 4.00e 
    in a DOS window of Windows 2000. Makefiles, source files, and batch files 
    are also included in the package.
    The OrigenArp GUI was created using Microsoft Visual C++, and PlotOPUS was 
    created with Microsoft Visual Basic and GigaSoft ProEssentials.

10. REFERENCES 
    a) included in hard copy and electronic form: 
     S. Bowman, "README for ORIGEN-ARP" (README.PDF, May 2002). 
    b) included in electronic (PDF) format only:
     I. Gauld, D. L. Barnett, O. W. Hermann, and S. M. Bowman, "OPUS/PlotOPUS: 
     An ORIGEN-S Post-Processing Utility and Plotting Program for SCALE," 
     NUREG/CR-0200, Revision 7, Volume 2, Section F15, ORNL/NUREG/CSD-2/R7 (April 2002).
     I. C. Gauld, O. W. Hermann, and R. M. Westfall, "ORIGEN-S: SCALE SYSTEM 
     MODULE TO CALCULATE FUEL DEPLETION, ACTINIDE TRANSMUTATION, FISSION PRODUCT 
     BUILDUP AND DECAY, AND ASSOCIATED RADIATION SOURCE TERMS," NUREG/CR-0200, 
     Revision 7, Volume 2, Section F7, ORNL/NUREG/CSD-2/V2/R7 (April 2002).
     I. C. Gauld, J. C. Ryman, and O. W. Hermann, "ORIGEN-S DATA LIBRARIES," 
     NUREG/CR-0200, Revision 7, Volume 3, Section M6, ORNL/NUREG/CSD-2/V3/R7 (April 2002).
     S. M. Bowman and L. C. Leal, "ORIGEN-ARP: AUTOMATIC RAPID PROCESS FOR SPENT 
     FUEL DEPLETION, DECAY, AND SOURCE TERM ANALYSIS," NUREG/CR-0200 Revision 6, 
     Volume 1, Section D1, ORNL/NUREG/CSD-2/V1/R6 (March 2000).

11. CONTENTS OF CODE PACKAGE 
    Included are the referenced documents and one CD on which the software is 
    transmitted. The software includes documentation, source codes, executables, 
    binary data libraries, makefiles, batch files, and sample problem input and 
    output; written in WinZip self-extracting compressed files with programs of 
    Nico Mak Computing, Inc.

12. DATE OF ABSTRACT 
    July 2001, revised May 2002.

KEYWORDS: NEUTRON; GAMMA-RAY SOURCE; SPENT FUEL CHARACTERIZATION; 
ISOTOPE INVENTORY; FISSION PRODUCT INVENTORY; WORKSTATION; MICROCOMPUTER