System safety based on a coordinated principle-based theme Page: 1 of 10
This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to UNT Digital Library by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
5,NN-_^-/ 59 9C-,qJ ,
System Safety Based on a Coordinated Principle-Based Theme
J. Arlin Cooper, Ph. D.; Sandia National Laboratories, Albuquerque, NMAbstract
In this paper, we demonstrate a logical
progression for the identification of assets,
threats, vulnerabilities, and protective measures,
based on a structured approach that incorporates
the results of the previous paper. We utilize a
logical structure for identifying the constituents
of the problem, derive appropriate applicable
principles, and demonstrate a technique for
incorporating the principles into a coordinated
safety theme. We also show how to qualitatively
assess such generally non-quantifiable items
such as safety-component and safety-system
response to severe abnormal environments. An
illustrative example is followed step-by-step
through to a safety system design approach and a
safety assessment approach.
Introduction
The general approach is illustrated here through
an example, generally representing a test rocket
launch scenario, where the concern is the
potential for loss of life. This specific objective
is done in a very general sense, and the treatment
is intended only for consideration of the possible
design and assessment strategies involved. No
implication of completeness or even familiarity
with the details of the launch operation process
should be inferred. It is expected that someone
who was more familiar with the scenario
described might find this approach useful while
treating the details as only experts in the field
could do. One would ordinarily utilize a system
diagram to aid in the processes described below.
We will omit that here, since the example is only
illustrative.In our example, we will cite only one asset for
simplicity: loss of life. However, the lives at
potential risk are the workers in the launch area,
people on the ground along the flight path and
near the impact area, and people in the air along
the flight path, which will be treated here as
three separate situations, each with its own
idiosyncrasies.
Implementation of Safety Theme
In the previous paper, an overall strategy was
delineated and a menu of protective measures
was described. Next, implementation (and
assessment of the implementation) involves
matching vulnerabilities against protective
measures in order to check whether or not all
vulnerabilities have been satisfactorily
considered. For the example scenario, we have
indicated a few protective measures in Figures 3-
6. They are organized according to a rough
qualitative order of effectiveness and cost-
effectiveness, ranging from most effective first to
least effective last. The "effectiveness" is judged
by whether or not a passive first principle can be
responsible, to what degree the protective
measure reduces some vulnerability or (more
preferably) vulnerabilities, and how cost-
effective it is. In each figure, the threats
addressed are indicated by shading over the
appropriate matrix entries. Note that in an actual
application, vulnerabilities would be addressed
individually, but in this illustration, we are
treating them by categories. We would also be
more specific about ranking protective measures,
since neither the shading nor the number of
boxes shaded directly indicates effectiveness.DISTRIBUTION OF THIS DOCUMENT IS UNLIMITED
MASTER
Upcoming Pages
Here’s what’s next.
Search Inside
This article can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Article.
Cooper, J.A. System safety based on a coordinated principle-based theme, article, August 1, 1998; Albuquerque, New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc703977/m1/1/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.