Monte Carlo Code Criticality Benchmark Comparisons for Waste Packaging

Conference · Sun Jul 19 00:00:00 EDT 1992

OSTI ID:10153685

Alesso, H. P. ^[1]; Annese, C. E. ^[1]; Buck, R. M. ^[1]; Pearson, J. S. ^[1]; Lloyd, W. R. ^[1]

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1. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

COG is a new point-wise Monte Carlo code being developed and tested at Lawrence Livermore National Laboratory (LLNL). It solves the Boltzmann equation for the transport of neutrons and photons. The objective of this paper is to report on COG results for criticality benchmark experiments both on a Cray mainframe and on a HP 9000 workstation. COG has been recently ported to workstations to improve its accessibility to a wider community of users. COG has some similarities to a number of other computer codes used in the shielding and criticality community. The recently introduced high performance reduced instruction set (RISC) UNIX workstations provide computational power that approach mainframes at a fraction of the cost. A version of COG is currently being developed for the Hewlett Packard 9000/730 computer with a UNIX operating system. Subsequent porting operations will move COG to SUN, DEC, and IBM workstations. In addition, a CAD system for preparation of the geometry input for COG is being developed. In July 1977, Babcock & Wilcox Co. (B&W) was awarded a contract to conduct a series of critical experiments that simulated close-packed storage of LWR-type fuel. These experiments provided data for benchmarking and validating calculational methods used in predicting K-effective of nuclear fuel storage in close-packed, neutron poisoned arrays. Low enriched UO2 fuel pins in water-moderated lattices in fuel storage represent a challenging criticality calculation for Monte Carlo codes particularly when the fuel pins extend out of the water. COG and KENO calculational results of these criticality benchmark experiments are presented.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 10153685
• Report Number(s): UCRL-JC--110015; CONF-9207102--78; ON: DE93012499
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420203
560190
61 RADIATION PROTECTION AND DOSIMETRY
663610
663620
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
97 MATHEMATICS AND COMPUTING
990200
BENCHMARKS
BOLTZMANN EQUATION
C CODES
COG
CRITICALITY
Criticality Benchmark Experiments
FUEL ELEMENTS
HANDLING EQUIPMENT AND PROCEDURES
High Performance Reduced Instruction Set (RISC)
MATHEMATICS AND COMPUTERS
MONTE CARLO METHOD
Monte Carlo Code
NEUTRON PHYSICS
NEUTRON TRANSPORT
Nuclear Criticality Safety Program (NCSP)
PACKAGING
PHOTON TRANSPORT
PHYSICS OF RADIATIONS OTHER THAN NEUTRONS
RADIATION PROTECTION
RADIATION PROTECTION STANDARDS
RADIOACTIVE WASTES
Results
UNIX Workstations
URANIUM OXIDES