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Gaussian Plume and Puff Models for Offsite Dose Rates Evaluations

Gaussian Plume and Puff Models for Offsite Dose Rates Evaluations Department of Engineering and System Science National Tsing-Hua University Chunkuan Shih MST NJ, July 12, 2006. Gaussian Steady State Plume Model.  NPP effluents dispersion is based on site’s meteorology

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Gaussian Plume and Puff Models for Offsite Dose Rates Evaluations

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  1. Gaussian Plume and Puff Models for Offsite Dose Rates Evaluations Department of Engineering and System Science National Tsing-Hua University Chunkuan Shih MST NJ, July 12, 2006

  2. Gaussian Steady State Plume Model  NPP effluents dispersion is based on site’s meteorology  Concentration of effluent is determined by the usual diffusion equation  Gaussian plume model for dispersion in transverse directions  Dispersion coefficients determined from Pasquill conditions (A thru G)

  3. Local Meterorology

  4. Pasquill Conditions

  5. Diffusion Equation and Solution

  6. Dispersion Coefficients (Horizontal)

  7. Dispersion Coefficients (Vertical)

  8. Dispersion Coefficients for Type G

  9. Dose Rates Values and Presentations

  10. Dose Rates Values and Presentations

  11. Type B

  12. Type D

  13. Type F

  14. Gaussian Puff Model  Account for the time of travel of effluents and dispersions in all directions  Effluents are releases as successive puffs at every end of a preset duration of time (ex. 30 sec)  Code keeps track of dose rates and integrated doses at every downwind location (50m X 50m square) within 5 km radius .

  15. z r + y r z p + yp xp xr wind direction - y r H ground level Effluent Concentration Distribution The concentration due to the puff at the receptor(xr, yr, zr) relation to the center of a puff located at (xp, yp, zp)

  16. Ground Level Concentration For ground level concentration, zr is replaced by –H,

  17. Time Varying Thyroid Dose Rates 1000 s 2000 s 3000 s 4000 s

  18. Time Varying Thyroid Dose Rates

  19. Accident Classifications

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