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В 25 6 5 0.07

V 12 1 - -

Convection, velocity of cloud 2 m/sec.

M 62.6 12.1 82.8 16.2
3
A 14.1 2.75 13.0 2.22

M 110 32.6 185 40.2

10 A 28 5.97 39.4 6.81

B 6.88 0.85 - -

M 249 61.8 338 82.9

A 62.6 12.1 82.8 15.4
30
B 13.9 2.71 17.1 2.53

V 6.96 0.87 - -

Note. The area of contamination can be determined by calculation according to the
2
formula, km : S c.=0,8Lb.
2. Determination of the time of the beginning of the formation the trace of
radioactive cloud on the object (the start time of the object contamination) t start .
The start time of the formation of a trace of a radioactive cloud at the facility
after the accident, determine according to the table 8.6 or by calculation using data
of radioactive cloud moving velocity and the distance to NPP, R :
0

hour (8.3)

Table 8.6 – The time of the beginning of the formation the trace of
radioactive cloud on the areas after an accident at the NPP (beginning of
radioactive contamination (t start )), hour
Distance from Isotherm Inversion Convection
NPP, km
Velocity of moving the cloud, m/sec.

5 10 5 10 2 5

5 0.3 0.1 0.3 0.1 0.5 0.3

10 0.5 0.3 0.5 0.3 1.0 0.5

20 1.0 0.5 1.0 0.5 2.0 1.0

30 1.5 0.8 1.5 0.8 3.0 1.5

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