汚染雲からの吸収線量を計算するためのコードおよび原子力船のための数値計算例

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A program for calculating the external dose rate from a radioactive cloud was written in 06 NARC language (analogous to FORTRAN). The basic equation used for the atmospheric dispersion is equivalent to the so-called generalized Gaussian plume formula with the stack and the inversion lid modifications. The numerical integration was performed using the Legendre-Gauss quadrature technique together with the polar coordinate system developed by D.S.Duncan. The time required for the integration was found around forty minutes on the NEAC-2206 computer.The typical results from the program are shown in graphical from putting emphasis on the safety of the persons in the vicinity of a nuclear ship. To help the discussion, the results from the usual method of evaluation based on the assumption of infinitely spread cloud are also presented. Thus, the great safety factors involved in the conventional analysis are easily estimated as functions of downwind distance. For example, the actual finite cloud dose for the meteorological category F is lower than that computed for the infinite cloud by a factor of approximately 70 at 100m downwind distance, and by a factor of approximately 2 even as far from the stack as 10 km. Another important result of the calculation is the remarkable discrepancy between the isodose and the isoconcentration lines at distances close to the stack. It must be remembered, however, that the basic equation for the region extremely close to the stack is not yet well established, so the analysis for the region was made by extrapolating the available data. For this reason, the results may be considered as a measure for estimating the safety factors involved in the conventional analysis.
独立行政法人海上技術安全研究所の論文
1968-03-30

汚染雲からの吸収線量を計算するためのコードおよび原子力船のための数値計算例

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