![]() ![]() The models in PARAGRASS are based on the more detailed ones in FASTGRASS. PARAGRASS is an extremely efficient, mechanistic computer code with the capability of modeling steady-state and transient fission-product behavior. ![]() ![]() ![]() The thoery has received extensive verification over a wide range of fuel operating conditions, and can be regarded as a state-of-the-art model based on our current level of understanding of fission more ยป product behavior. The major improvements have been in the atomistic and bubble diffusive flow models, in the models for the behavior of gas bubbles on grain surfaces, and in the models for the behavior of the volatile fission products iodine and cesium. The theoretical FASTGRASS model for the prediction of the behavior of the gaseous and volatile fission products in nuclear fuels under normal and transient conditions has undergone substantial improvements. (ANL), Argonne, IL (United States) Sponsoring Org.: USNRC Nuclear Regulatory Commission, Washington, DC (United States) OSTI Identifier: 7255051 Report Number(s): NUREG/CR-5840 ANL-92/3 ON: TI92040783 DOE Contract Number: W-31109-ENG-38 Resource Type: Technical Report Country of Publication: United States Language: English Subject: 22 GENERAL STUDIES OF NUCLEAR REACTORS 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE FISSION PRODUCT RELEASE F CODES NUCLEAR FUELS BARIUM BUBBLES CESIUM GASES GRAIN BOUNDARIES IODINE RADIATION EFFECTS REACTOR ACCIDENTS STRONTIUM TELLURIUM URANIUM DIOXIDE XENON ACCIDENTS ACTINIDE COMPOUNDS ALKALI METALS ALKALINE EARTH METALS CHALCOGENIDES COMPUTER CODES CRYSTAL STRUCTURE ELEMENTS ENERGY SOURCES FLUIDS FUELS HALOGENS MATERIALS METALS MICROSTRUCTURE NONMETALS OXIDES OXYGEN COMPOUNDS RARE GASES REACTOR MATERIALS SEMIMETALS URANIUM COMPOUNDS URANIUM OXIDES 220900* - Nuclear Reactor Technology- Reactor Safety 220504 - Nuclear Reactor Technology- Environmental Aspects- Design Basis & Hypothetical Accidents- (1992-) 990200 - Mathematics & Computers of Systems Research Argonne National Lab. Publication Date: Tue Sep 01 00:00: Research Org.: Nuclear Regulatory Commission, Washington, DC (United States). Argonne National Lab., IL (United States). ![]()
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