SENSITIVITY, APPLICABILITY AND VALIDATION OF BI-GAUSSIAN OFF- AND ON-LINE MODELS FOR THE EVALUATION OF THE CONSEQUENCES OF ACCIDENTAL RELEASES IN NUCLEAR FACILITIES
A computer code CAERS (Computer Aided Emergency Response System) has been developed for off-line simulation of the short-term concentrations caused by an atmospheric emission. The concentration calculations are based on the bi-Gaussian theorem with the possibility of using twelve different sets of turbulence typing schemes and dispersion parameters or the plume can be simulated with a bidimensional puff trajectory model in which the emission and the wind conditions can be variable in time. Sixteen SF-6 tracer dispersion experiments (mobile and stationary time averaging sampling) have been carried out for validation of the on-line and off-line models of CAERS. The tracer experiments showed that the CAERS system, using the bi-Gaussian model and the SCK/CEN turbulence typing scheme, can simulate short time concentration levels very well. The variations of the plume under non-steady emission and meteo conditions are well simulated by the puff trajectory model. This leads to the general conclusion that the atmospheric dispersion models of the CAERS system can give a significant contribution to the management and the interpretation of air pollution concentration measurements in emergency situations.
Bibliographic Reference: EUR 9385 EN (1984), MF, 176 P., BFR 240, BLOW-UP COPY BFR 880, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989123082700 / Last updated on: 1987-01-01
Available languages: en