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Shutdown Safety...
Continued from page 27
and challenged at the Outage
Readiness Meeting.
• The second approach is that all sites
are required to prepare and present
their post outage critique results at a
T+30 Post Outage Review Meeting.
This meeting is lead by the site
Outage Manager and includes all site
work groups and major contractors.
The meeting is normally scheduled
for 3 hours and is attended by senior
level corporate executives and
Corporate Functional Area Managers
(CFAM). The site will report out on
it’s outage performance compared
to pre-established outage goals and
objectives. They will also report out
on overall industrial safety, human
performance, radiological safety
and shutdown safety performance.
Finally, all of the work groups will
report out on any changes made in
the outage that were effective and
any major lessons learned.
• The final approach is that Exelon
holds an annual Fleet Outage Lessons
Learned (FOLL) meeting following
the completion of each spring outage
season. This is a review of Exelon
refueling outage performance in
industrial safety, human performance,
radiological safety, shutdown safety,
outage duration and work group
effectiveness. Fleet actions are taken
on any negative trends identified,
tracked and implemented prior to the
next outage season.
outage. Specific codes are used to
identify what outage work is to be
performed, systems that are affected and
prioritization of the work. Once coded for
an outage, work packages are planned,
clearance out-of-service boundaries are
written, radiation work permits assigned,
materials ordered and labor assigned.
Completion and readiness of the all of
these tasks are tracked for all of the work
assigned through performance indicators
and reviewed at the Outage Readiness
Meetings.
The second major piece of software
used is a scheduling system. A different
system is used at the Mid Atlantic sites
(Primevera) than is used at the Midwest
sites (Project View). However, the
function of each is the same. The
scheduling software will download all
of the assigned outage tasks from the
work management system. The Outage
Management organization will take these
tasks (work order activities, clearances,
etc.) and schedule these activities in a
logical sequence taking into account
shutdown safety defense in depth, resource
availability and work logic strings. The
first downloads of work is performed at
approximately 10 months before the start
statused or removed from the schedule,
when completed.
The third major piece of software
used is the shutdown safety software,
PARAGON. This system is utilized
across all 10 Exelon sites. PARAGON
is designed to take a download from
the scheduling software above and
determine which systems are available or
not available to maintain site shutdown
safety. The function of PARAGON is to
determine overall site shutdown safety
risk using a tiered approach. Values for
systems important to shutdown safety,
along with amount of decay heat and time
to boil are inputs to PARAGON. A risk
profile for key safety functions (electrical
power, decay heat removal, etc.) is
generated and an overall site risk color
is assigned. If PARAGON determines
unsatisfactory shutdown safety, then the
schedule is revised to make sure shutdown
safety is maintained before systems are
removed from service.
5. What are the lessons learned from the
last major equipment (Turbine, Reactor
Pressure Vessel Head, Steam Generators,
or any other equipment) work done
during refueling outage?
4. What major software (describe the
functionality) is utilized to assist in
refueling outage?
Exelon uses 3 major pieces of
software to manage outage work and
schedule coordination.
The first major piece of software
used is a work management system.
A different system is used at the Mid
Atlantic sites (PIMS) than is used at the
Midwest sites (Passport). However, the
function of each is the same. The work
management system is used to identify
corrective and preventative maintenance
tasks to be performed during a refueling
A new turbine rotor that was recently installed at Quad Cities
of the outage and performed daily to
upload all new added work. This schedule
is refined until a workable product is
established at 3 months before the start
of the outage. During outage execution,
as work is performed, work activities are
Lessons learned from the major
equipment across Exelon is controlled
and managed by the following processes:
Exelon has an Outage Services
organization that is responsible for
maintenance on the reactor, steam
28 www.NuclearPlantJournal.com Nuclear Plant Journal, May-June 2010