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1、Stepan G. MashnikLaurie S. WatersLos Alamos National Laboratoryhttp:/mcnpx.lanl.govLos Alamos National Laboratory, an affirmative action/equal opportunity employer, is operated by the Los Alamos National Security, LLC for the National Nuclear Security Administration of the U.S. Department of Energy

2、under contract DE-AC52-06NA25396. By acceptance of this article, the publisher recognizes that the U.S. Government retains a nonexclusive, royalty-free license to publish or reproduce the published form of this contribution, or to allow others to do so, for U.S. Government purposes. Los Alamos Natio

3、nal Laboratory requests that the publisher identify this article as work performed under the auspices of the U.S. Department of Energy. Los Alamos National Laboratory strongly supports academic freedom and a researchers right to publish; as an institution, however, the Laboratory does not endorse th

4、e viewpoint of a publication or guarantee its technical correctness.byJuly 6, 2009Copyright 2009. Los Alamos National Security, LLC. All rights reserved.This material was produced under U.S. Government contract DE-AC52-06NA25396 for Los Alamos National Laboratory, which is operated by Los Alamos Nat

5、ional Security, LLC for the U.S. Department of Energy. The Government is granted for itself and others acting on its behalf a paid-up, nonexclusive, irrevocable worldwide license in this material to reproduce, prepare derivative works, and perform publicly and display publicly. Beginning five （5） ye

6、ars after （insert date permission to assert copyright was obtained）, subject to additional five-year worldwide renewals, the Government is granted for itself and others acting on its behalf a paid-up, nonexclusive, irrevocable worldwide license in this material to reproduce, prepare derivative works

7、, distribute copies to the public, perform publicly and display publicly, and to permit others to do so.NEITHER THE UNITED STATES NOR THE UNITED STATES DEPARTMENT OF ENERGY, NOR LOS ALAMOS NATIONAL SECURITY, LLC, NOR ANY OF THEIR EMPLOYEES, MAKES ANY WARRANTY, EXPRESS OR IMPLIED, OR ASSUMES ANY LEGA

8、L LIABILITY OR RESPONSIBILITY FOR THE ACCURACY, COMPLETENESS, OR USEFULNESS OF ANY INFORMATION, APPARATUS, PRODUCT, OR PROCESS DISCLOSED, OR REPRESENTS THAT ITS USE WOULD NOT INFRINGE PRIVATELY OWNED RIGHTS.TABLE OF CONTENTS1 Introduction 11.1 Summary of New MCNPX Features 11.2 Availability 21.3 Doc

9、umentation 21.4 Cash Awards Quality Assurance Program 22 Description of new MCNPX Features 32.1 Tally Tagging 32.1.1 User Interface 32.1.2 Usage and Special Cases 42.1.3 Examples 52.2 CEM 3.02 Upgrade, 62.3 MCPLOT Graphics and “HELP” Command Upgrades 82.3.1 Graphics Upgrades 82.3.2 “HELP” Command Up

10、grade 112.4 Embedded Sources 122.4.1 User Interface 122.4.2 Examples 132.5 Stopping Power Energy Table Control 162.6 Cyclic Time Bins 163 MCNPX 2.7.B Feature EXTENSIONS and Enhancements 163.1 Spontaneous Photon Automatic Weight Adjustment 163.2 Burnup Enhancements 193.3 Lattice FILL Error Trap 203.4

11、 LINUX Static Build 203.5 Windows 64-bit Support/Compilation without Graphics 203.6 Special Treatment Tally for Electron Current 213.7 RUNTPE Initialization During MPI 213.8 New Special Treatment Tally: LET 213.9 Special Dose Function 213.10 Residual Tally Upgrades 223.11 Lattice Cell Rejection for

12、Sources 223.12 ACT: Activation Control Card 223.13 Spectra/Lines for Delayed Neutron Emission 233.14 TF Card Extension 233.15 Minor Enhancements: 234 MCNPX Corrections 244.1 Significant Problem Corrections 244.1.1 Minor Burnup Reaction Rates Off 244.1.2 Spontaneous Fission Normalization Error 244.1.

13、3 DXTRAN Fail with Repeated Structures 244.1.4 Heavy Ion Errors 244.1.5 S（,） File Reading Failure 244.1.6 Burnup Continue Runs 254.1.7 Heavy Ions 254.1.8 Spontaneous Fission Automatic Weighting 254.1.9 Spontaneous Photon Material/Cell Error 254.2 Minor Problem Corrections 254.2.1 INTEL Compiler Work

14、around 264.2.2 LAQGSM Corrections 264.2.3 Compiler Workaround 264.2.4 Detector Tallies in Lattice Geometries 264.2.5 Burnup Duplicate ZAIDs 264.2.6 Source Particle Types Unrecognized in Dependent Distributions 264.2.7 Incorrect Warning Error for Detector Tallies 264.2.8 Choice of High-Energy Mode 27

15、4.2.9 Lost Particles Cause Crash 274.2.10 Tally Tagging Labels 274.2.11 Heavy Ion Direction Cosines 274.2.12 Cylindrical Mesh Tally 274.2.13 Stopping Power Bin Control 274.2.14 Revised GDR.DAT 274.2.15 Muon Physics 274.2.16 Light Ion Production from Inelastic Collisions 274.2.17 Isomer Branching in

16、Burnup 284.2.18 PTRAC Capture Events 284.2.19 Burnup Tier 3 Fission Products 284.2.20 KCODE Fission Source in MPI 284.2.21 CEM/LAQGSM 284.2.22 Delayed Neutron / Delayed Gamma Correction 284.2.23 Secondary Particle Arrays Increased 284.2.24 MPI Run Wall Clock Correction 284.2.25 Uninitialized or Out-

17、of-Bounds Arrays 295 Future work 29ABSTRACTMCNPX is a Fortran90 Monte Carlo radiation transport computer code that transports nearly all particles at nearly all energies for nearly all applications. The new capabilities of the latest version, MCNPX2.7.B, beyond those in MCNPX 2.6.0, are described.1

18、IntroductionMCNPX （MCNP eXtended） is a Fortran90 （F90） Monte Carlo radiation transport computer code that transports nearly all particles at nearly all energies. It is a superset of MCNP4C3 and has many capabilities beyond MCNP4C3. MCNPX is a production computer code that models the interaction of r

19、adiation with matter. Its quality is highly regarded and cash awards （described in Section1.4） are offered for bugs.1.1 Summary of New MCNPX FeaturesThe new capabilities and enhancements of MCNPX2.7.B beyond MCNPX2.6.0 are listed below. （Where applicable, the initials of the principal developers are

20、 shown in parentheses.） Note that the delayed-gamma emission and criticality source convergence acceleration capabilities are developmental. They are not backed by the MCNPX cash awards quality assurance program and must be used cautiously. However, these capabilities are considered of such signific

21、ance that they are included. Recall also that as of version 2.6.0 total （not prompt ） is the default for fission neutrons. The new MCNPX2.7.B capabilities include the following: Tally tagging （GWM） CEM 3.02 upgrade （MRJ/SGM） Plot appearance upgrades （JWD） Embedded sources （JSH） Stopping power energy

22、 table control （GWM） Cyclic time bins （GWM） Extensions and enhancements Corrections1.2 AvailabilityThe latest general-release version is MCNPX2.6.0, which is available from the Radiation Safety Information Computational Center （RSICC） and the Office of Economic Cooperation and Development/Nuclear En

23、ergy Agency （OECD/NEA） in Paris, France.For approved users, beta test program versions may be downloaded from the MCNPX website. Approximately 2000 MCNPX beta test users are an essential part of the MCNPX software quality assurance program. In general, to become a new beta test user usually requires

24、 being an MCNPX sponsor, collaborator, or U.S. citizen participant in an MCNPX workshop training course. For more information, contact us at the following address: mcnpxlanl.gov.MCNPX is U.S. export controlled. Generally, MCNPX is easy to obtain for legitimate purposes, but restrictions protect the

25、code, data, and documentation once it is acquired.1.3 DocumentationRestricted Documentation:Complete MCNPX documentation is available in the “MCNPX Users Manual Version2.6.0,” which comes with MCNPX from RSICC or OECD/NEA and is available to MCNPX beta testers from the Worldwide Web （WWW）.Unrestrict

26、ed Documentation:Documentation of MCNPX features in MCNPX2.5.0that is, all MCNPX features beyond MCNPX2.3.0 and MCNP4Cis provided in “MCNPX Extensions, Version2.5.0.” Similarly, features beyond MCNPX2.5.0 that appear in MCNPX2.6.0, are described in MCNPX2.6.0 Extensions.MCNPX capabilities developed

27、since MCNPX2.6.0 are documented in this report.All of the extended MCNPX capabilities are summarized in the one-page MCNPX features list. 1.4 Cash Awards Quality Assurance ProgramWe are so confident in the quality of MCNPX that John Hendricks and Michael James offer cash awards to the first person w

28、ho finds any bug in the code. They will pay $20 to the first person finding anything that does not meet or exceed the capabilities of MCNPX2.3.0 and MCNP4C3. European users will be awarded 20. They also will pay a brand new $2 bill for any error in MCNPX that has been inherited from its constituent

29、codes. A list of all winners since June2001 can be found on the MCNPX WWW site. 2 Description of new MCNPX FeaturesNote that the delayed-gamma emission and criticality source convergence acceleration capabilities are developmental. These capabilities are not backed by the MCNPX cash awards program a

30、nd must be used cautiously. Nevertheless, they are considered of such significance that they are included. The principal new capabilities of MCNPX beyond MCNPX2.6.0 described in detail in this section are Tally tagging CEM 3.02 upgrade Plot appearance upgrades Embedded sources Stopping power energy table control Cyclic time bins2.1 Tally Tagging Tally tagging, a new feature in v.2.7.A, provides the ability to separate a tally into components based on how and where the scoring parti