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Title: Simulation of atmospheric dispersion of radioactivity from the Chernobyl accident

Measurements of airborne radioactivity over Europe, Japan, and the United States indicated that the release from the Chernobyl reactor accident in the Soviet Union on April 26, 1986 contained a wide spectrum of fission up to heights of 7 km or more within a few days after the initial explosion. This high-altitude presence of radioactivity would in part be attributable to atmospheric dynamics factors other than the thermal energy released in the initial explosion. Indications were that two types of releases had taken place -- an initial powerful explosion followed by days of a less energetic reactor fire. The Atmospheric Release Advisory Capability (ARAC) at the Lawrence Livermore National Laboratory (LLNL) utilized three-dimensional atmospheric dispersion models to determine the characteristics of the source term (release) and the evolution of the spatial distributions of the airborne radioactivity as it was transported over Europe and subsequently over the northern hemisphere. This paper describes the ARAC involvement and the results of the hemispheric model calculations which graphically depict the extensive dispersal of radioactivity. 1 fig.
Authors:
; ;  [1]
  1. (Lawrence Livermore National Lab., CA (USA))
Publication Date:
OSTI Identifier:
5400563
Report Number(s):
UCRL-101507; CONF-891103--27
ON: DE89015626; TRN: 89-029009
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Winter meeting of the American Nuclear Society, San Francisco, CA (USA), 26-30 Nov 1989
Research Org:
Lawrence Livermore National Lab., CA (USA)
Sponsoring Org:
DOE/ER
Country of Publication:
United States
Language:
English
Subject:
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.; 22 GENERAL STUDIES OF NUCLEAR REACTORS; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; CHERNOBYLSK-4 REACTOR; REACTOR ACCIDENTS; DISPERSIONS; COMPUTERIZED SIMULATION; ATMOSPHERIC CIRCULATION; ENVIRONMENTAL TRANSPORT; FALLOUT; FEDERAL REPUBLIC OF GERMANY; FOOD CHAINS; GLOBAL ASPECTS; THREE-DIMENSIONAL CALCULATIONS; TRANSFRONTIER CONTAMINATION; ACCIDENTS; CONTAMINATION; ENRICHED URANIUM REACTORS; EUROPE; GRAPHITE MODERATED REACTORS; LWGR TYPE REACTORS; MASS TRANSFER; POWER REACTORS; REACTORS; SIMULATION; THERMAL REACTORS; WATER COOLED REACTORS 560161* -- Radionuclide Effects, Kinetics, & Toxicology-- Man; 220500 -- Nuclear Reactor Technology-- Environmental Aspects; 210300 -- Power Reactors, Nonbreeding, Graphite Moderated; 220900 -- Nuclear Reactor Technology-- Reactor Safety