Current status of the FASTGRASS/PARAGRASS models for fission product release from LWR fuel during normal and accident conditions
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. 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 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 product behavior. PARAGRASS is an extremely efficient, mechanistic computer code with the capability of modeling steady-state and transient fission-product behavior. The models in PARAGRASS are based on the more detailed ones in FASTGRASS. PARAGRASS updates for the FRAPCON (PNL), FRAP-T (INEL), and SCDAP (INEL) codes have recently been completed and implemented. Results from an extensive FASTGRASS verification are presented and discussed for steady-state and transient conditions. In addition, FASTGRASS predictions for fission product release rate constants are compared with those in NUREG-0772. 21 references, 13 figures.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 5564702
- Report Number(s):
- CONF-8310143-58; ON: DE84003551
- Resource Relation:
- Conference: 11. NRC water reactor safety research information meeting, Gaithersburg, MD, USA, 14 Oct 1983
- Country of Publication:
- United States
- Language:
- English
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21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
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FISSION PRODUCT RELEASE
COMPUTERIZED SIMULATION
PWR TYPE REACTORS
CESIUM
F CODES
IODINE
NUCLEAR FUELS
P CODES
REACTOR ACCIDENTS
URANIUM DIOXIDE
ACCIDENTS
ACTINIDE COMPOUNDS
ALKALI METALS
CHALCOGENIDES
COMPUTER CODES
ELEMENTS
ENERGY SOURCES
FUELS
HALOGENS
MATERIALS
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NONMETALS
OXIDES
OXYGEN COMPOUNDS
REACTOR MATERIALS
REACTORS
SIMULATION
URANIUM COMPOUNDS
URANIUM OXIDES
WATER COOLED REACTORS
WATER MODERATED REACTORS
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