Page 41 - Nuclear Plant Journal - March April 2013
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Nuclear Plant Journal, March-April 2013
41
ILI activities, EMAT functionality was
validated at the beginning and end of each
shift by running the ILI robot through a 6’
pipe spool containing embedded defects.
This pipe spool, fabricated by CNS, was
located adjacent to the robot launch site
and had negligible impact to our project
schedule.
Inspection Results
The Diakont/SI team successfully
completed the HPCI robotic inspection
project, achieving 100% inspection
coverage throughout the entire planned
inspection scope, within the designated
outage timeframe. The high-resolution
Diakont robotic NDE tool detected
only four minor anomalies, all in the
lower half of a 45° elbow fitting. These
anomalies were characterized as internal
(process side) corrosion, but all measured
remaining wall thickness values exceeded
87.5% of the nominal pipe wall thickness
(i.e. the manufacturer tolerance). The
inspection findings were presented to the
Cooper NDE Level III, who confirmed
that the internal anomalies had no
structural significance. The safety-related
HPCI piping system was determined
to have no thinning beyond the critical
threshold, and was returned to service
immediately following the completion
of the inspection. The inspection data
from this inspection was entered into the
site’s BPWorks™ buried pipe inspection
database for future use in risk ranking or
inspection planning purposes in support
of the site’s NEI 09-14 (Guideline for the
Management of Underground Piping and
Tank Integrity) and to meet CNS’ license
renewal commitment.
This project demonstrated the
successfuluseofestablishedpre-evaluation
flaw criteria, in order to expedite critical
outage-driven inspections, and the use of
robotic in-line inspection tools to obtain
nuclear plant buried piping integrity data
on a safety-related system.
Contact: Keith Reeser, Diakont,
3821-C Calle Fortunada, San Diego,
California 92123; telephone: (858) 551-
5551, email:
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