Description of the riso puff diffusion model

Journal Article · Mon Oct 01 04:00:00 EDT 1984 · Nucl. Technol.; (United States)

OSTI ID:6127878

Mikkelsen, T; Larsen, S E; Thykier-Nielsen, S

An operational puff diffusion model has been developed at Riso National Laboratory to provide risk and safety assessments in connection with nuclear installations. The computer model releases a sequence of puffs with individual pollutant and heat contents, then calculates the time-dependent concentration field, which is provided by the collection of puffs. The puffs are advected through a three-dimensional grid on the basis of a sequence of either measured or simulated horizontal wind vectors. In one case study where the time duration of a pollutant release was varied, the puff model predicted a Gaussian dose distribution only when the source duration was relatively short. For use at distances up to about 1 km from the release point, experimental observations of nonstationary smoke plume diffusion seem to justify a puff advection scheme, where all the puffs in each time step are advected with the instantaneous velocity vector measured at the release point.

• Research Organization: Riso National Laboratory, Meteorology Section, Physics Department P.O. Box 49, DK 4000 Roskilde
• OSTI ID: 6127878
• Journal Information: Nucl. Technol.; (United States), Journal Name: Nucl. Technol.; (United States) Vol. 67:1; ISSN NUTYB
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220900* -- Nuclear Reactor Technology-- Reactor Safety
500300 -- Environment
Atmospheric-- Radioactive Materials Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION
COMPUTERIZED SIMULATION
DIFFUSION
DOSES
GAUSSIAN PROCESSES
MATERIALS
NUCLEAR FACILITIES
NUCLEAR POWER PLANTS
PLUMES
POLLUTION
POWER PLANTS
RADIATION DOSES
RADIOACTIVE EFFLUENTS
RADIOACTIVE MATERIALS
RADIOACTIVE WASTES
REACTOR SAFETY
RISK ASSESSMENT
SAFETY
SIMULATION
THERMAL POWER PLANTS
TIME DEPENDENCE
WASTES