報告書番号

E284011

タイトル（和文）

A SYSTEM FOR PREDICTING THE CONSEQUENCES OF ATMOSPHERIC RELEASES FROM NUCLEAR FACILITIES LOCATED IN COMPLEX TERRAIN

タイトル（英文）

A SYSTEM FOR PREDICTING THE CONSEQUENCES OF ATMOSPHERIC RELEASES FROM NUCLEAR FACILITIES LOCATED IN COMPLEX TERRAIN

概要 （図表や脚注は「報告書全文」に掲載しております）

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概要 （英文）

THIS REPORT PRESENTS A SYSTEM FOR THE PREDICTION OF THE CONSEQUENCES OF AN ACCIDENTAL ATMOSPHERIC RELEASE FROM A NUCLEAR POWER PLANTS. IN THIS SYSTEM, CONCENTRATION CALCULATIONS ARE PERFORMED WITH A THREE-DIMENSIONAL GAUSSIAN PLUME TRAJECTORY MODEL. THE POTENTIAL FLOW MODEL OR QUASI-POTENTIAL FLOW MODEL DEVELOPED IN OUR LABORATORY IS USED TO PROVIDE THE THREE-DIMENSIONAL SPACE-AND TIME-VARYING ADVECTION FIELD TO THE TRAJECTORY DIFFUSION MODEL. THE METEOROLOGICAL DATA REQUIRED BY THOSE WIND FIELD MODELS ARE OBSERVED OR FORECASTED WINDS AT A CERTAIN POINT TYPICAL OF INFLOW BOUNDARY CONDITION.THE FORECASTED WINDS ARE CALCULATED FROM A STATISTICAL MODEL USING PRINCIPAL COMPONENTANALYSIS AND MAXIMUM ENTROPY METHOD.THE DIFFUSION PARAMETERS ARE ESTIMATED FROM THE CONCENTRATION DISTRIBUTIONS MEASURED WITH WIND TUNNEL EXPERIMENTS FOR THE TOPOGRAPHICAL MODELS OF A SITE OF INTEREST AND ITS SURROUNDINGS. THE GAMMA EXPOSURE RATES DUE TO RADIOACTIVE PLUMES ARE CALCULATED FROM A SIMPLIFIED EXPOSURE MODEL BASED ON PLUME SEGMENT MODEL. THE DOSE ASSESSMENT METHOD DESCRIBED IN THIS REPORT IS USEFUL IN REAL-TIME ESTIMATION OF THE BEHAVIOR OF RADIOACTIVE PLUMES RELEASED FROM NUCLEAR FACILITIES LOCATED IN COMPLEX TERRAIN.

報告者

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