SCALE-4.3 Available from RSIC

The existing CSAS control module has been improved by the addition of an option to perform a criticality search on nuclide concentration. NITAWL-II has also been improved significantly by adding the capability to handle p-wave and d-wave resonances included in the new SCALE ENDF/B-V 238- and 44-group libraries and to interpolate thermal-scattering matrices on temperature. KENO-V.a and KENO-VI can produce 2-D color GIF plots. Also added in SCALE-4.3 is a new shielding control module, QADS (NUREG/CR-5468, ORNL/CSD/TM-270), and the 3-D point-kernel shielding module QAD-CGGP. QADS automates the use of the QAD-CGGP code for gamma-ray shielding calculations.

SCALE-4.3 Minor Modifications

SCALE driver: The driver was modified to improve portability to other types of workstations. Modifications to accept upper- or lower-case input files were also added.

KENO-V.a: (1) Corrected an error that occurred when a history encountered an edge where differential albedos were used. Other minor fixes were made for (2) printing densities of mixtures that have other mixtures added in and (3) printing information on start and plot input parameters that were previously omitted.

NITAWL: Corrected an error passing a variable of the wrong type that resulted in incorrect self-shielding of thermal groups below 0.5 eV.

All Control Modules (MIPLIB): Modified MIPLIB to check for resonance data on the cross-section library used to determine whether to perform resonance corrections for a nuclide. Previously, a flag in the Standard Composition Library was used to make this determination.

CSAS/MODIFY: Modified the search sequences to update unit cell data or number densities (depending on the type of search) and execute BONAMI and NITAWL prior to every KENO-V.a calculation.

SAS2: (1) Corrected the soluble boron concentration to change linearly when NLIB/CYC>1. (2) Modified to allow use of the SYMMSLABCELL geometry in MIPLIB and more than one fuel zone. (3) Automated model setup when burnable poison rods occupy some but not all guide tubes in a fuel assembly. (4) Added THERM, RES, FAST, and the two energy boundaries for converting cross sections to the total flux normalization. (5) Modified to include the use of unit 70 for unreƒognized libraries. (6) Corrected an error that occurred if light element nuclides in both the ORIGEN-S light element and fission product libraries are input as individual nuclides in the MIPLIB input.

ORIGEN-S : (1) Replaced call to INQOPN with call to OPNFIL for standard input (unit 5) to improve portability to other computers. (2) Initialized arrays only within the array boundaries for better portability. (3) Added EXTERNAL statements for BLOCK DATA files to improve portability. (4) Improved coding for the integral option using the actinide library. (5) Corrected program to execute a continuation subcase when using the integral option. (6) Corrected call to subroutine STOP.

ORIGEN-S Libraries: (1) Corrected Cf-249 data in lowest energy group in Master Photon Library. It was high by factor of 100. (2) Corrected the half-life of Se-79. It was low by factor of 10. (3) Corrected Br-86m decay data that were erroneously changed in ENDF/B-VI update.

COUPLE: (1) Added check for correct ordering of fission product nuclides by atomic weight in input library. (2) Added EXTERNAL statement for BLOCK DATA files to improve portability to other computers. (3) Modified output format for THERM, RES, and FAST from floating point to exponential.

Standard Composition Library: (1) Added new composition ZIRC2 for Zircaloy-2 when using ENDF/B-V cross-section libraries. (2) Replaced ås and åt values in Nuclide Information Table with average values calculated from ENDF/B-V or ENDF/B-VI libraries. (3) Density for ZIRCALLOY and ZIRC2 was corrected from 6.506 to 6.56 g/cc.

XSDRNPM: (1) Modified to scale the weighting flux so that minimum value is 1E-20. This modification was made to reduce the likelihood that an underflow would occur when creating a weighted cross-section library for problems where there are large variations in the flux (many orders of magnitude). (2) Corrected an error that caused broad-group-flux edits to print bad values. (3) Corrected an error that would occur when creating a gamma-only broad-group library.

SAS4: (1) Increased the number of mesh intervals for both neutrons and gammas in the XSDRNPM adjoint calculation to improve the likelihood of convergence. Made additional minor changes to improve portability. (2) Updated for consistency with new nuclide ID numbering scheme in MIPLIB.

MORSE: Corrected a problem caused by the use of an incorrect normalization factor on standard deviations at the end of each batch. This problem occurred when NMOST was equal to NSTRT.

SAS1: Modified to force the pointer for the double-precision flux array to start on a double-word boundary. This change improves performance significantly on some workstations other than IBM. All modules (UNIXLIB): Modified subroutine DATIM to read the date and time from the file "datetime.std" if it exists. This option will be useful for comparing sample problem output files.

KENO-V.a, SAS2 (SUBLIB): Modified subroutine YREAD to correctly read an array of numbers separated by commas.

Finding Help with SCALE

ORIGEN-ARP Automated PC Sequence

KENOView Displays 3-D KENO Geometry

The SCALE staff makes no recommendation or endorsement of this program, but recognizes that it may be a valuable tool for checking geometry models. Some of the limitations and problems noted include: (1) printouts do not always match what is displayed on the screen (usually the printout is more accurate), (2) some of the windows do not come to the top when clicked with a mouse, (3) no shading is performed in 3-D mode; therefore, the perspective appears to "jump in and out."

Report on SCALE Training Course

The Course was hosted and taught by the staff of the ORNL Computational Physics and Engineering Division, who are responsible for the development and maintenance of the SCALE code system. The Course emphasized hands-on experience solving practical problems on PCs in small workgroups.

Because the class is being held at ORNL, the number of registrants will be limited to 24. Registrations will be accepted on a first-come basis and must include the full registration fee of $1,200. No FAX or e-mail registrations will be accepted. Please FAX or e-mail any questions to the addresses listed at the end of the Newsletter.

Registration Form

KENO-VI Training Course

Oak Ridge National Laboratory, Oak Ridge, Tennessee

May 20-23, 1996

Name _____________________________________________

Citizenship ________________________________________

Organization ______________________________________

Mailing address ____________________________________

__________________________________________________

__________________________________________________

Telephone: _________________________ Fax: _________________________

E-mail: _________________________________________________________

Please enclose registration fee of $1,200 payable to: KENO-VI Training Course

Please mail form and payment to:

Steve Bowman

KENO-VI Training Course

Oak Ridge National Laboratory

P.O. Box 2008, MS 6370

Oak Ridge, Tennessee 37831-6370

Please fill out the attached Experience / Preferences Form and return along with this registration form. This form will aid the instructors in planning work groups prior to the /ourse.

NOTE: Course attendance is limited. PLEASE REGISTER EARLY!

No refunds will be made, but you may send a substitute in your place.

Experience / Preferences Form

Organization ______________________________________________________

Address all correspondence (including address additions or changes) to: