RSICC COMPUTER CODE CCC-371
1. NAME AND TITLE
ORIGEN2 V2.2: Isotope Generation and Depletion Code ─ Matrix Exponential Method.
CCC-834/SCALE 6.2.1 with the latest version of ORIGEN is generally recommended for new ORIGEN users.
No significant updates have been made to ORIGEN2 in more than 10 years, and it is no longer supported by ORNL. We recommend that new users obtain CCC-834/ SCALE 6.2.1 that includes the latest version of ORIGEN, which is supported by ORNL and has the latest nuclear data.
RSICC Abstract: http://rsicc.ornl.gov/codes/ccc/ccc8/ccc-834.html.
ORIGEN‑ARP is an automated depletion decay sequence for both Windows and Unix/Linux systems. It includes a Windows graphical user interface (GUI) for ORIGEN‑S and ARP (Automated Rapid Processing), which automatically interpolates cross sections on enrichment, burnup, and optionally moderator density using a set of standard basic cross‑section libraries for LWR and MOX fuel assembly designs. The interpolated cross sections are passed to ORIGEN‑S. Utility codes are provided so users can generate their own ORIGEN‑ARP basic cross‑section libraries via TRITON or SAS2H. SCALE 5.1 includes the STARBUCS 3-D burnup credit sequence (combining ORIGEN-ARP with KENO V.a or KENO-VI) and the SMORES 1-D material optimization sequence for criticality safety.
Note that ORIGEN-ARP is incompatible with MonteBurns. If you want to run MonteBurns, you must use ORIGEN2.2 and MCNP or MCNPX.
Oak Ridge National Laboratory, Oak Ridge, Tennessee.
3. CODING LANGUAGE AND COMPUTER
Fortran; Pentium PC (Windows and Linux), DEC Alpha, Sun (C00371ALLCP03).
4. NATURE OF PROBLEM SOLVED
ORIGEN is a computer code system for calculating the buildup, decay, and processing of radioactive materials. ORIGEN2 is a revised version of ORIGEN and incorporates updates of the reactor models, cross sections, fission product yields, decay data, and decay photon data, as well as the source code. ORIGEN2.1 replaces ORIGEN2 and includes additional libraries for standard and extended-burnup PWR and BWR calculations, which are documented in ORNL/TM-11018.
ORIGEN2.1 was first released in August 1991 and was replaced with ORIGEN2 Version 2.2 in June 2002. Version 2.2 was the first update to ORIGEN2 in over 10 years and was stimulated by a user discovering a discrepancy in the mass of fission products calculated using ORIGEN2 V2.1. Code modifications, as well as reducing the irradiation time step to no more than 100 days/step reduced the discrepancy from ~10% to 0.16%. The bug does not noticeably affect the fission product mass in typical ORIGEN2 calculations involving reactor fuels because essentially all of the fissions come from actinides that have explicit fission product yield libraries. Thus, most previous ORIGEN2 calculations that were otherwise set up properly should not be affected.
5. METHOD OF SOLUTION
ORIGEN uses a matrix exponential method to solve a large system of coupled, linear, first-order ordinary differential equations with constant coefficients.
ORIGEN2 has been variably dimensioned to allow the user to tailor the size of the executable module to the problem size and/or the available computer space. Dimensioned arrays have been set large enough to handle almost any size problem, using virtual memory capabilities available on most mainframe and 386/486 based PCS. The user is provided with much of the framework necessary to put some of the arrays to several different uses, call for the subroutines that perform the desired operations, and provide a mechanism to execute multiple ORIGEN2 problems with a single job.
6. RESTRICTIONS OR LIMITATIONS
No detailed documentation for guiding a novice user is provided.
7. TYPICAL RUNNING TIME
All five sample problems ran in about 1 minute on a Pentium IV 1.6GHZ.
8. COMPUTER HARDWARE REQUIREMENTS
Version 2.2 runs on Pentium PCs, Sun, and DEC Alpha workstations.
9. COMPUTER SOFTWARE REQUIREMENTS
Executables are included for Windows and Linux PCs. All other systems require a Fortran compiler. The Windows executables were created on a Pentium IV in a DOS window of Windows2000 with the Lahey/Fujitsu Fortran 95 Compiler Release 5.50d compiler. They were also tested under WindowsXP. The code was tested on a Pentium III running RedHat Linux 6.1 with The Portland Group, Inc. (PGI) F77 compiler 3.1‑3 & gcc. The PGI executables are included in the Linux distribution. ORIGEN22 was also tested on DEC 500 AU under Digital Unix 4.0D with the DEC Fortran 5.1‑8 compiler and on a Sun SparcStation under SunOS 5.6 using f77 5.0. Unix users may need to modify date and time subroutine calls.
a) Included in documentation:
A. G. Croff, "ORIGEN2 Code Package CCC-371," Informal Notes (October 1981).
A. G. Croff, "A User's Manual for the ORIGEN2 Computer Code," ORNL/TM-7175 (July 1980).
A. G. Croff, "ORIGEN2: A Versatile Computer Code for Calculating the Nuclide Compositions and Characteristics of Nuclear Materials," Nucl. Technol., 62, p 335 (September 1983).
Scott Ludwig, Correction to Nucl. Technol. (September 1983) article.
Scott Ludwig, "ORIGEN2, Version 2.1 (August 1, 1991) Release Notes."(Revised May 1999).
Scott Ludwig, ARevision to ORIGEN2 - Version 2.2,@ transmittal memo (May 23, 2002).
b) Background information:
S. B. Ludwig, J. P. Renier, "Standard- and Extended-Burnup PWR and BWR Reactor Models for the ORIGEN2 Computer Code," ORNL/TM-11018 (December 1989).
11. CONTENTS OF CODE PACKAGE
Included are the referenced documents in (10.a) and a CD which contains a self-extracting, compressed Windows file and a GNU compressed tar file. The distribution files include source code, executables for Windows and Linux PCs, libraries, batch files, information files, and sample problem input, plus output from the sample problem.
12. DATE OF ABSTRACT
February 1982; revised December 1982, January 1985, July 1985, August 1985, January 1986, January 1987, October 1987, January 1989, September 1989, September 1990, May 1991, August 1991, July 1995, February 1996, August 1996, May 1999, June 2002, abstract revised August 2005 and May 2009.
KEYWORDS: ISOTOPE INVENTORY; FISSION PRODUCT INVENTORY; MICROCOMPUTER; MULTIGROUP; NEUTRON; GAMMA-RAY SOURCE