Application of SAFE to an operating reactor Page: 4 of 13
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addition, there are several ancillary buildings around the area.
All of this informatica is translated into a computer representation
of the facility.
A procedure has been developed for accomplishing this task.
The input required for this procedure includes the (1) plant layout
characteristics that comprise the principal barriers and obstruc-
tions to any adversary movement, (2) all points of potential ingress
and egress by the adversary (this might include such items as win-
dows, doors, potential adversary penetration points of boundaries,
barriers, fences, walls of the building, etc.), and (3) floor levels
and their interconnection through stairwells and ventilation ducts.
The specific targets and vital areas for a set of operational con-
ditions is also required.
The facility representation phase is accomplished through a
digitizing process pictorially illustrated in Figure 6, in which the
analyst uses a digitizing tablet and a cross-hair pen to send X,Y
coordinates of the locations from the blueprints to the computer.
The analyst simply traces over the essential or key features of the
blueprints and obtains a corresponding one-to-one computer graphics
representation. The result of this process is a simplified facility
drawing for the overall facility, as shown in Figure 7. This draw-
ing represents the first level of the facility, i.e., the chain-link
fence and the major buildings inside the fence. Figure 8 represents
the interior of the building which is designated Plant Layout-Level
2. The diamonds represent potential sabotage targets, and the tri-
anyles represent stairwells that join one floor to another. Figure
9 represents the third level of this facility.
The next step in the process of evaluating physical protection
systems involves setting the component performance of each of the
physical protection system components. The objective of this phase
is to base performance of both hardware and personnel upon relevant
sets of environmental and adversary conditions for that specific
site. As Figure 10 pictorially illustrates, the process involves
as input the computer representation that was produced in the facil-
ity representation phase. Also, the facility characterization phase
provides a description of the physical protection system components
and the site-relevant environmental conditions. When this informa-
tion is coupled with specific adversary characteristics a specific
component performance that is relevant to the environment and the
given threat being considered can be set. For example, if one com-
ponent of the physical protection system is a fence disturbance
detection system (an intrusion detection system on the fence at
the perimeter of the facility), under a high-wind condition, fence
would shake the sensor system and the net result would be a large
number of false alarms. Under this condition, the intrusion alarm
would be ineffective. Therefore, it would be desirable to have
alternative procedures or multiple detection systems in order to
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Chapman, L.D. Application of SAFE to an operating reactor, article, January 1, 1979; United States. (digital.library.unt.edu/ark:/67531/metadc1105741/m1/4/: accessed January 20, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.