We see excellent source convergence acceleration for the most difficult problems: the 3D Kord Smith Challenge and fuel storage vault. We apply this method mainly to four problems: 2D pressurized water reactor (PWR), 3D Kord Smith Challenge, OECD - Nuclear Energy Agency (NEA) source convergence benchmark fuel storage vault, and Advanced Test Reactor (ATR). There is also the question of practical use of this information here we examine a way of using eigenmode information to address the negative confidence interval bias due to inter-cycle correlation. We analyze higher modes for more realistic problems. , higher mode eigenfunctions are analyzed for a three-region 1-dimensional problem and 2-dimensional homogenous problem. Conventional Monte Carlo cannot calculate this data - here we have a way to get new information for multiplying systems. We can gain other information from directly tallying the fission kernel: higher eigenmodes and eigenvalues. When the distance between source and fission events is short compared with the size of the entire system, saving memory by accounting for only local coupling introduces little extra error.
Two factors lead to a renewed interest here: the larger memory available on modern computers and the development of a better storage scheme based on physical intuition. For realistic problems, where a fine resolution is required for the suppression of discretization error, the storage becomes inordinate. Publication Date: Mon Aug 01 00:00: Research Org.: Oak Ridge National Lab., TN (USA) OSTI Identifier: 6906834 Report Number(s): ORNL/TM-10810 ON: DE88015377 DOE Contract Number: AC05-84OR21400 Resource Type: Technical Report Resource Relation: Other Information: Portions of this document are illegible in microfiche products Country of Publication: United States Language: English Subject: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS 45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE AIR RADIATION TRANSPORT X RADIATION BENCHMARKS BLACKBODY RADIATION CALIBRATION MONTE CARLO METHOD NUCLEAR EXPLOSIONS PERSONAL COMPUTERS COMPUTERS DIGITAL COMPUTERS ELECTROMAGNETIC RADIATION EXPLOSIONS FLUIDS GASES IONIZING RADIATIONS RADIATIONS 654001* - Radiation & Shielding Physics- Radiation Physics, Shielding Calculations & Experiments 450200 - Military Technology, Weaponry, & National Defense- Nuclear Explosions & = values.
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