Nuclear Plant Journal, September-October 2014 NuclearPlantJournal.com
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Innovation Program, EPRI is developing
a methodology to identify vulnerabilities
due to external events that could have
major consequences to a nuclear plant or
to the transmission system itself.
The project combines the efforts of
EPRI’s Power Delivery and Utilization
sector, which has compiled a significant
body of technical work in grid component
performance and grid stability, and EPRI’s
Nuclear sector, which has developed
tools and techniques for the state-of-the-
art probabilistic risk assessments (PRAs)
used throughout the nuclear industry. The
goal is to apply PRA models and insights
to improve grid reliability, resulting
in a tool that operates in real time and
responds to changing environments and
system configurations. The tool will
provide recommendations for reducing
risk, restoring margin in grid reliability,
and assisting in system recovery.
Because applying PRA tools such as
the EOOS Risk Monitoring Software to
the entire grid would not be feasible due
to size and complexity, the methodology
uses a “zone of vulnerability” (ZoV)
concept. The ZoV defines areas of the
grid where faults can propagate and
impact nuclear plant operation. It also
shows how faults originating at a nuclear
power plant can affect transmission
grid reliability. The ZoV concept helps
identify “local” regions of the grid that
can be further analyzed using PRA tools.
A recent EPRI report (3002002765,
Program on Technology Innovation:
Grid Reliability Using Risk and Safety
Management Tools: Phase I: Zone of
Vulnerability Analysis for Nuclear
Power
) describes the first phase of the
project, outlining the ZoV methodology
and describing the type of contingencies
and conditions that need to be included in
the analysis. The methodology was tested
with a generic power system model,
including a representative model of a
nuclear power plant.
Future research will develop
PRA models within the ZoV module,
integrating it with EPRI PRA tools such
as Computer Aided Fault Tree Analysis
System (CAFTA) software and EOOS.
A simple example would be to determine
the range in which a lighting strike on a
transmission line would cause problems
at a nuclear plant. When storms are in
this area, the plant would take preemptive
actions to minimize the effect of the
lightning strike by putting the plant in
a secure equipment configuration as
determined by EOOS.
Contact: Jean Francois Roy,
