| Yankee
Nuclear Power Station – Spent Fuel Pool Project |
Project
Description:
The Yankee Nuclear Power Station in Rowe, Massachusetts
is currently being decommissioned and dismantled.
As part of this process, spent nuclear fuel assemblies
must be removed from the spent fuel pool and eventually
transported offsite to a federal nuclear waste
storage facility.
Coler
& Colantonio, Inc. was contacted by Duke Engineering
& Services to perform an engineering survey
to determine the floor conditions for the support
of a transfer cask lay down pad. The transfer
cask would be lowered into the pool and an overhead
crane would transfer the spent fuel assemblies
to the cask for removal and storage. Consideration
of any irregularities or obstructions present
on the pool floor was required in order to maintain
verticality and provide a solid foundation for
the transfer cask. An obstruction survey was also
required to locate any obstructions within 12
inches of the transfer cask vertical access corridor
into and out of the Spent Fuel Pool. |
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Special
Considerations:
•
High security area with highly restricted access
requiring facility escorts.
• Access required General Employee Training
and Radiation Worker Training of survey personnel,
and security background checks.
• Extensive pre-planning and facility approval
of all personnel, procedures, and equipment prior
to performing the work.
Detailed List of Services:
•
Site reconnaissance and preparation of a proposal
for two methods of survey, a direct contact and
an optional indirect (close range photography or
laser scanning) survey method.
• Design, fabrication, and testing of a 45-ft.
long special carbon fiber survey rod for use in
the Spent Fuel Pool using the direct contact survey
method.
• Design of a survey methodology to perform
the pool floor and access corridor obstruction surveys.
• Performance of a test to confirm designed
survey methodology, ascertain functionality of the
survey rod in an underwater environment, and to
evaluate the accuracy of the observation data.
• Calibration of all necessary equipment and
complete preparations required to perform the survey
prior to the actual survey.
• Performance of the pool floor and access
corridor obstruction surveys, processing and evaluation
of the field survey observation data.
• Preparation of a set of plans showing the
underwater floor topography and obstruction on the
floor and access corridor and submittal of a survey
report documenting the results of the surveys |
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