Lawrence Livermore National Laboratory PREPRO Accomplishments Dermott “Red” Cullen Presented at the Nuclear Criticality Safety Program Technical Conference.

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Presentation transcript:

Lawrence Livermore National Laboratory PREPRO Accomplishments Dermott “Red” Cullen Presented at the Nuclear Criticality Safety Program Technical Conference at Oak Ridge National Laboratory, March 1, 2011 Updated October 27, 2011 Lawrence Livermore National Laboratory, P.O. Box 808, L-198, Livermore, CA This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA LLNL-PRES

Latest version of Codes Lawrence Livermore National Laboratory 2  PREPRO2010 = ENDF/B Pre-Processing Codes - Processes ALL ENDF/B Evaluations for use in our transport codes - Runs on ANY computer: PC, MAC, VAX, LINUX, UNIX – Available as RSICC Code Package MIS-013: – – Also available internationally through IAEA FREE on-line: – – including documentation and “Best Input Parameters”  Methods used in PREPRO are - Based on over 40 years of experience - Using up-to-date methods, documented in NEW, “Handbook of Nuclear Engineering”, (2010), vol. 1, chapter 4, “Nuclear Data Preparation”, pp , by Dermott E. Cullen

What’s new? Lawrence Livermore National Laboratory 3  Improved optimization (faster) - Conservative coding that allows highest level of optimization on ALL computers - Simplified standard input: code users love this feature – makes codes easy to use - Improved based on code user feedback - Improved compiler diagnostics on many computers: PC, MAC, VAX,LINUX,UNIX - A truly International effort to prepare codes for use on many computers - Code users freely contributed their time to this effort (see later acknowledgment)  New and Improved codes – SPECTRA is a new code for 2010, which starting from models and tabulated data, linearizes and tabulates neutron emission spectra (MF=5) in a standard form; it is similar to and is an extension of the LINEAR code that performs a similar function for cross sections (MF=3). – RECENT for 2010 has been extended to handle the general Reich-Moore (LRF=7) resolved resonance formalism. The other resolved formalisms calculate and output total, elastic, capture and fission cross sections. The general Reich-Moore allows many more output channels; RECENT 2010 allows up to 10 output channels, and outputs cross sections are all of these channels. - The only publicly released code to include integrated processing of new Reich-Moore (LRF=7) Data

What’s new? Lawrence Livermore National Laboratory 4  New and Improved codes (continued) – SIGMA1 for 2010 has been updated for improved low energy treatment, as well as improved accuracy and consistency throughout. – EVALPLOT and COMPLOT are graphics codes that allow users to quickly view nuclear data on their computer screen and/or produce Postscript files for later use, i.e., as in reports. - Absolutely necessary for data testing and comparison, e.g., ENDF/B vs. JENDL  BEST INPUT - parameters are provided for all codes to achieve the recommended precision for integral cross sections of 0.1%, and 0.01% in the thermal, low energy range, and 1% for angular and energy distributions. - This attempts to establish a standard of accuracy for processing data. - Code users love this feature – makes codes easy to use

 POINT2009 = ENDF/B-VII.0 processed cross-sections - All processed solely by the latest PREPRO codes - Reconstructed, energy dependent cross sections: ~ 10 gigabytes of data - Temperature dependent: at 14 temperatures - 0 (300) 2100 Kelvin (Reactors) eV to 10 keV (Astrophysics) – Available as RSICC Data Library DLC-239: – – Available internationally through IAEA FREE on-line: – PREPRO is used throughout the World to Distribute Processed data for Other Data Libraries on-line: JENDL, JEF, TENDL, etc. - it has become the de facto standard for this use Latest version of Data Lawrence Livermore National Laboratory 2

What’s next? Lawrence Livermore National Laboratory 5 Continuing Data Testing - PREPRO has been recognized for many years as a primary means of validating Nuclear Data - It has been used to validate ENDF/B data all the way back to the original version of ENDF/B – over 40 years of experience - All of the experience from these many years of data testing are built into today’s codes = let’s avoid repeating past errors - Today PREPRO continues to be used to test and validate new data libraries - see for the series of reports entitledhttp://home.comcast.net/~redcullen1 “What’s Wrong with ENDF/B. More important, how can we FIX it?” POINT2011 = ENDF/B-VII.1 beta 4 processed cross-sections - ENDF/B-VII.0 has been extensively tested since its release in 2006, e.g., “ENDF/B-VII.0 Data Testing Using 1,172 Critical Assemblies”, UCRL-TR , Oct New and improved evaluations are now available in ENDF/B-VII.1 beta 4

What’s next (continued)? Lawrence Livermore National Laboratory 5 – POINT 2001 Processing - ENDF/B-VII.0 already available on-line: 393 Evaluations - ENDF/B-VII.1 beta 4 includes: 418 Evaluations - See the on-line report explaining the differences, – POINT 2011 Released to IAEA, NNDC and RSICC - Now available on-line ~ 16 gigabytes – Testing - POINT 2011 now being tested using the COG and TART - Monte Carlo transport codes.

Acknowledgements Lawrence Livermore National Laboratory 6  In closing I must acknowledge the contributions of those who prepared the PREPRO 2010 package for release for use on: PC, MAC, VAX, LINUX, UNIX; without their efforts PREPRO 2010 would not be available for use on ALL of these computers: – Ramon Arcilla, Jr. (National Nuclear Data Center, Brookhaven) – Roberto Capote Noy (Nuclear Data Section, IAEA) – Liam Costello (Nuclear Data Section, IAEA) – Ed Lent (LLNL) – Jennie Manneschmidt (RSICC, ORNL) – Ivan Sirakov (INRNE, Bulgaria) – Jean Christophe Sublet (CEA, France) – Andrej Trkov (IJS, Slovenia)  Last, but not least, I gratefully acknowledge the following individuals for continuing to propose interesting and useful extensions to these codes: – S. Ganesan (BARC, India) – Jean Christophe Sublet (CEA, France) – Andrej Trkov (IJS, Slovenia)