g. Time-of-Arrival Arcs.
Time-of-arrival arcs of interest are drawn in, using the effective wind
speed and the procedure in Part A.
h. Orientation.
Next, the fallout predictor ground zero point is placed over the actual or
assumed GZ on the map, and the entire fallout predictor is rotated until the
effective downwind direction in degrees on the azimuth dial is pointing
toward grid north. The scale of the M5A2 Fallout Predictor and the map must
be the same.
i. Evaluation.
The simplified fallout prediction is now complete, and
the
operational
aspects of the fallout hazard can be evaluated.
4.
Special Cases.
a. Infrequently, the fallout wind vector plot prepared by the NBCE may
indicate a warning area angle greater than 40 degrees. In these instances,
the greater angle will be given beside the particular line of the effective
downwind message for the yield group affected. Using units will expand the
warning area beyond the fixed 40-degree angle of the simplified fallout
predictor to correspond with the angle given at the side of the particular
line of the effective downwind message.
b. A special case may arise when one or more of the data lines on the
effective downwind message may contain only three digits. The three digits
are the Zone I downwind distance for the highest yield in the yield group of
interest and an effective wind speed of 8 kmph, determined from the nomogram
(Figure 3-14).
The example problem (below) illustrates the use of the M5A2 Radiological
Fallout Area Predictor in the preparation of a simplified fallout
prediction.
Example Problem.
Use of the M5A2 Radiological Fallout Area Predictor.
c. Situation.
Assume that the S3, 2d Bn, 62d Inf, has the following effective downwind
message available:
CM5206
3-28
Previous Page
