Kinetics of fission product release prior to fuel slumping

Conference · Thu Oct 01 04:00:00 EDT 1987

OSTI ID:5745103

Rest, J

This paper describes the primary physical/chemical models recently incorporated into a mechanistic code (FASTGRASS) for the estimation of fission product release from fuel, and compares predicted results with test data. The theory of noble gas behavior is discussed in relation to its effect on the release behavior of I, Cs, Te, Ba, and Sr. The behavior of these fission products in the presence of fuel liquefaction/dissolution and oxidation grain-growth phenomena is presented, as is the chemistry of Sr, Ba, I, and Cs. Comparison of code predictions with data indicates the following trends. Fission product release behavior from solid strongly depends on fuel microstructure, irradiation history, time at temperature, and internal fuel rod chemistry. Fuel liquefaction/dissolution, fracturing, and oxidation also exert a pronounced effect on release during fuel rod degradation. For very low burnup fuel appreciable fission product retention in previously liquefied fuel can occur due to the low concentration of fission products, and the limited growth of bubbles in the liquefied material. 24 refs., 13 figs., 9 tabs.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5745103
• Report Number(s): CONF-871236-1; ON: DE88002899
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220300 -- Nuclear Reactor Technology-- Fuel Elements
220502 -- Nuclear Reactor Technology-- Environmental Aspects-- Radioactive Effluents
220900* -- Nuclear Reactor Technology-- Reactor Safety
ACCIDENTS
ACTINIDE COMPOUNDS
ALKALI METAL COMPOUNDS
ALKALI METALS
ALKALINE EARTH METAL COMPOUNDS
ALKALINE EARTH METALS
BARIUM
BARIUM COMPOUNDS
BARIUM OXIDES
BUBBLES
CESIUM
CESIUM COMPOUNDS
CESIUM IODIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMPUTER CODES
CRYSTAL STRUCTURE
DIFFUSION
DISSOLUTION
ELEMENTS
F CODES
FISSION PRODUCT RELEASE
FLUIDS
FUEL ELEMENTS
GASES
GRAIN BOUNDARIES
GRAIN GROWTH
HALIDES
HALOGEN COMPOUNDS
HALOGENS
HAZARDS
HEALTH HAZARDS
INORGANIC PHOSPHORS
IODIDES
IODINE
IODINE COMPOUNDS
ISOTOPES
KINETICS
LIQUEFACTION
MATHEMATICAL MODELS
METALS
MICROSTRUCTURE
NONMETALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHOSPHORS
PLATINUM METALS
RADIOISOTOPES
RARE GASES
REACTION KINETICS
REACTOR ACCIDENTS
REACTOR COMPONENTS
REACTOR SAFETY
RUTHENIUM
SAFETY
SEMIMETALS
STRONTIUM
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
TELLURIUM
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
URANIUM COMPOUNDS
URANIUM DIOXIDE
URANIUM OXIDES
VERY HIGH TEMPERATURE
XENON