atw 2018-02

inforum

atw Vol. 63 (2018) | Issue 2 ı February

RESEARCH AND INNOVATION 118

| | Fig. 7.

Code Algorithms of Concentration of activity in products is calculated from

the raw product that used in construction of KIANA Advance Computational

Computer Code.

| | Fig. 8.

Code Algorithms intake of activity by humans is calculated from the

time-dependant concentrations of activity in foodstuffs and the human

consumption rate that used in construction of KIANA Advance

Computational Computer Code (upper part of the diagram).

Code Algorithms for dose Ding(t) due to ingestion of contaminated

foodstuffs within time t after the deposition, is given by the following

that used in construction of KIANA Advance Computational Computer

Code (lower part of the diagram).

that particular area. For example

the deposition, atmospheric activity

levels, dose obtained and individual

health risk, due to any NPP accident,

may be very high, but these high

values may not mean anything if there

is no one living there. Consequently,

better representation of the collective

doses or risk of an accident, nuclear

and nonnuclear, can be obtained by

multiplying the individual dose or

health risk by the number of people

living in the receptor. For this study,

average values all over the geographical

regions were taken into

account, since data does not vary

considerably over the regions. On

the other hand. Transfer factors for

animal- feeds and soil-plants, and fixation

rates, distribution coefficients,

translocation factors, dose conversion

factors and metabolic turnover rates

in animals for all related isotopes, and

processing factors and storage days

for food products, weathering rates,

interception factors and soil density,

water content of soil, percolation

water velocity, dilution factor of

the grass, depth of root zone, the

references in which Cs-137 default

values were taken for validation study,

were used in KIANA Advance Computational

Computer Code during

simulation of the case studies. Since

most of these data are not dependent

on location.

5 Result and discussions

Dispersion of radionuclides is also an

application area of KIANA Advance

Computational Computer Code. User

supplied inputs for KIANA Advance

Computational Computer Code calculations

are pollutant species

characteristics, emission parameters,

gridded meteorological fields and

output deposition grid definitions.

The horizontal deformation of the

wind field, the wind shear, and the

vertical diffusivity profile are used to

compute the dispersion rate. Gridded

meteorological data are required for

regular time intervals. The meteorological

data fields may be provided on

one of the different vertical coordinate

system: Pressure-sigma, pressure

absolute, terrain-sigma or a hybrid

absolute-pressure-sigma The doses

and time dependant radioactivity concentration

values in the food products

and pasture grass predicted by KIANA

Advance Computational Computer

Code have been compared with those

of different codes (AIREM,DOZA)

which participated in assessment task,

and data measured in Boshehr, and

Finland after Chernobyl accident.

Radionuclide

Activity (Bq)

Sr-89

8.5E+09

Kr-90

6.7E+13

Rb-90

6.4E+13

Sr-90

2.2E+07

Sr-91

2.6E+11

Sr-92

2.1E+11

Mo-99

1.1E+09

Ru-103

9.3E+08

Ru-106

1.3E+07

Ru-106

1.3E+07

Ru-106

1.3E+07

Te-131

9.3E+10

I-131 3.1E+13

Te-132

1.2E+10

I-132 8.3E+13

Te-133

1.6E+11

I-133 6.8E+13

Xe-133

1.7E+13

I-134 6.3E13

Cs-134

1.8E+12

I-135 5.1E+13

Xe-135

1.1E+13

Cs-137

2.8E+12

Xe-138

4.6E+13

C-138 4.9E+13

Ba-139

9.9E+11

Ba-140

1.1E+10

La-140

1.4E+09

141-Ce

1.8E+09

Ce-144

2.0E+08

Br-84

1.5E+13

Kr-85m

1.2E+13

Kr-85

3.3E+09

Br-87

3.7E+13

Kr-87

3.9E+13

Kr-88

4.9E+13

Rb-88

4.9E+13

Kr-89

6.7E+13

Rb-89

7.1E+13

Pr-144

1.8E+08

Zr-95

1.2E+09

Nb-95

1.2E+07

Zr-97

7.4E+10

Nb-97

6.7E+10

Na-24

2.7E+11

K-42 1.2E+12

Fe-59

1.9E+07

Co-58

7.4E+07

Cr-51

1.4E+08

Mn-54

1.9E+07

Co-60

2.0E+08

Activities (Bq)

I-131 3.1E+11

I-132 8.4E+11

I-133 6.9E+11

I-134 6.3E+11

I-135 5.1E+11

| | Tab. 1.

Radionuclide release to environment after

severe accident at typically WWER-1000 NPP

such as Boushehr.

Those codes are dynamic (timedependent),

and only one of them; i.e.

DoseCAL, is quasi-equilibrium. Since

KIANA Advance Computational Computer

Code is developed as dynamic

software (such as DoseCAL), only

dynamic codes' results are presented

for comparison. KIANA Advance

Computational Computer Code has a

Research and Innovation

Design and Development of a Radio eco logical Domestic User Friendly Code for Calculation of Radiation Doses and Concentration due to Airborn Radio nuclides Release

A. Haghighi Shad, D. Masti, M. Athari Allaf, K. Sepanloo, S.A.H. Feghhi and R. Khodadadi