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Title: A model for nonvolatile fission product release during reactor accident conditions

An analytical model has been developed to describe the release kinetics of nonvolatile fission products (e.g., molybdenum, cerium, ruthenium, and barium) from uranium dioxide fuel under severe reactor accident conditions. This treatment considers the rate-controlling process of release in accordance with diffusional transport in the fuel matrix and fission product vaporization from the fuel surface into the surrounding gas atmosphere. The effect of the oxygen potential in the gas atmosphere on the chemical form and volatility of the fission product is considered. A correlation is also developed to account for the trapping effects of antimony and tellurium in the Zircaloy cladding. This model interprets the release behavior of fission products observed in Commissariat a l`Energie Atomique experiments conducted in the HEVA/VERCORS facility at high temperature in a hydrogen and steam atmosphere.
Authors:
; ;  [1] ;  [2]
  1. CEA Centre d`Etudes Nucleaires, Grenoble (France)
  2. CEA Centre d`Etudes Nucleaires, Fontenay aux Roses (France)
Publication Date:
OSTI Identifier:
379820
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nuclear Technology; Journal Volume: 116; Journal Issue: 1; Other Information: PBD: Oct 1996
Country of Publication:
United States
Language:
English
Subject:
22 NUCLEAR REACTOR TECHNOLOGY; 99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS; REACTOR ACCIDENTS; MATHEMATICAL MODELS; MOLYBDENUM; FISSION PRODUCT RELEASE; CERIUM; RUTHENIUM; BARIUM; TEST FACILITIES; EVAPORATION; FUEL CANS; REACTOR SAFETY EXPERIMENTS