Trial application of the worker safety assessment methodology Page: 3 of 4
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CIII for which the risk level of 10' per year is exceeded. The
much smaller number of scenarios applying to the ex-facility
worker for which a risk level of 10-1 fatality per year is
exceeded indicates that at a facility with a robust confinement
structure and effluent filtration system, the in-facility worker
is the primary risk recipient.
The present study shows that the WSAM provides a
feasible methodology for assessing worker risks at DOE
facilities. The cost of this phase of the present study was a
modest fraction of the cost of performing the PrHA. A
second phase involving QRA would be more resource
intensive; however, QRA may be applied in a graded fashion
to promote cost efficiency. The present study also'indicates
that WSAM has the potential to provide significant benefits in
terms of facility risk characterization, and cost-effective
prioritization of risk reduction measures.
104 10S1 104 104 10' 101 to'
VERY RE MOHRISK MEDIUMRISK LOWRISK OPERATING
Events spen moe than one riskcategcy
Figure 2 In-facility worker risk matrix
4. LIMITATIONS OF APPLICATION
In this phase of the study, only scoping quantitative
risk estimates have been performed for a few selected
scenarios. In a later phase, the scenarios with risk which may
exceed or approach 10' fatality per year would be subjected
to further detailed analysis to better quantify their frequencies,
consequences, and the uncertainties in the frequencies and
The existing PrHA of the facility, partially motivated
by the objective of providing the bases of a more detailed risk
analysis, proved to be a valuable asset for evaluating worker
risks and comparing them to proposed goals. The PrHA
results, however, have limitations as well. They do not
provide a sufficiently narrow range of risks to the workers; the
scenario risks are not measured against objective criteria; and
the risk discrimination provided may be insufficient to make
informed decisions. These limitations can be removed by
utilizing the results of the PrHA in a study like this, and
extending it by performing QRA of the higher risk scenarios
identified in this study. A follow-up QRA will have other
benefits such as determining the importance of preventive and
mitigative systems in reducing risk.
This report was prepared as an account of work sponsored by an agency of the United States
Government. Neither the United States Government nor any agency thereof, nor any of their
employees, makes any warranty, express or implied, or assumes any legal liability or responsi-
bility for the accuracy, completeness, or usefulness of any information, apparatus, product, or
process disclosed, or represents that its use would not infringe privately owned rights. Refer-
ence herein to any specific commercial product, process, or service by trade name, trademark,
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mendation, or favoring by the United States Government or any agency thereof. The views
and opinions of authors expressed herein do not necessarily state or reflect those of the
United States Government or any agency thereof.
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Marchese, A.R. & Neogy, P. Trial application of the worker safety assessment methodology, article, December 31, 1995; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc667119/m1/3/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.