SCALE 5.1 MIPLIB Update for Dancoff Factor Correction     25 June 2007
                                                  Updated:  4 September 2007

(Includes updates for BONAMIST, CSAS, CSAS6, MODIFY, NEWT, PMC, STARBUCS, 
 TRITON, TRITON6, TSUNAMI-1D, and TSUNAMI-3D)

UPDATED 4 Sept. 2007: It was discovered on Aug. 31 that the TRITON6
executable of 6/21/07 was not linked correctly and produced an error
message in KENO-VI when running a training class problem. A "clean" was
performed on TRITON6 and a new executable was created on 9/4/07.

NOTE: This download is recommended for all SCALE 5.1 users. It contains updates
previously posted on the SCALE website for BONAMIST and TRITON/NEWT/PMC/MIPLIB as
well as the updates discussed below.

The following updates have been made to the Material Information
Processor Library (MIPLIB) in SCALE: 

(1) An error in the calculation of Dancoff factors for clad regions was
introduced in SCALE 5.0. This error only affects calculations that use
LATTICECELL cell types and the NITAWL resonance processing module.
Approximately 180 LWR and MOX fuel critical benchmarks were run with and
without the correction. On average, the difference in the calculated
keff values was 0.01% with a maximum of 0.18%, indicating that the
effect on previous calculations is negligible (within statistical
uncertainty). 

(2) The calculation of zone volumes as well as periodic boundary
conditions and non-zero left boundary locations for slabs were also
corrected. These errors also had negligible impact on calculated k-eff
values.


Installation instructions 
------------------------- 

The updates are now included with the CENTRMST update on 
www.ornl.gov/sci/scale/centrmst_update.htm. See the README file there 
for instructions on how to download and install.