Civil Engineering Reference
In-Depth Information
Source term pre-
processor:
nuclide specific release
data
Meteorological data
Measurements from tower or SODAR,
Prognoses from weather service
Input by hand from user
Meteorological data
Measurements from tower or SODAR,
Prognoses from weather service
Input by hand from user
Environmental data
(topography, land use)
Environmental data
(topography, land use)
processor:
nuclide specific release
data
Meteorological pre-processor MPP
Meteorological pre-processor MPP
Pre-processor for real-time and prognostic weather data providing the necessary wind,
turbulence, and precipitation data for the dispersion models
turbulence, and precipitation data for the dispersion models
Diagnostic 3-D flow model
Atmospheric dispersion and deposition calculations
Atmospheric dispersion and deposition calculations
Puff models
RIMPUFF and ATSTEP
Puff models
RIMPUFF and ATSTEP
Particle models
DIPCOT
Particle models
DIPCOT
and LASAT
Long-range model MATCH
DWD-model LPDM (Germany)
Acute dose and dose rate models
Acute dose and dose rate models
Food chain and Dose Model
(Terrestrial) FDMT
Food chain and Dose Model
(Terrestrial) FDMT
Early countermeasures EmerSim
Early countermeasures EmerSim
Health effects and costs
Health effects and costs
Fig. 21.1
The terrestrial model chain of JRodos
21.2.1 The Terrestrial Model Chain
Figure
21.1
illustrates the components of the terrestrial model chain of JRodos.
21.2.1.1 The Source Term Preprocessor
The source term preprocessor prepares in each calculation time step the amount of
released radionuclides for the atmospheric dispersion models. Accepted as input are
source term data put in by hand, or measurements from the German remote
surveillance systems for nuclear reactors, or archived source terms from the sys-
tem's data base. The activity release may be specified in terms of nuclide-specific
data or aggregated activities of nuclide groups; if necessary this becomes converted
into the release rates of individual nuclides required by the models, taking into
account the type of reactor and the type of accident.
21.2.1.2 Meteorological Preprocessor and Diffusion Models
The meteorological preprocessor [
6
] prepares in each calculation time step a three-
dimensional wind vector and turbulence field as well as a precipitation field in a
format
suitable
for
the
atmospheric dispersion and deposition models.
