Results of the site’s engineered
safety feature actuation system test on the
“B” train revealed that the water hammer
modification corrected the large-scale
column closure water hammer.
“As a result of teamwork, problem
solving and ownership, the design
modification resolved the legacy water
50
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Mitigating Water...
Pipe Chase Module Assembly.
the vault walls were completed by early
February 2015. While the concrete base
mat and walls were curing, a series of
holes were drilled across the face of the
Control Building from ground level up
to the roof. A total of 132 anchor bolts
and four feet long through bolts were
then used to attach the 8 pre-fabricated
steel modules to the Control Building.
The design used 8 pre-fabricated steel
modules as attached by through bolts
or embedded anchors to the Control
Building wall. A Pipe Chase Module is
shown in Figure 2.
The first steel module arrived on site
in mid-February 2015, was painted and
installed on the top of the concrete vault
on February 28, 2015 – the day Refueling
Outage 20 began. The remaining seven
modules arrived and were installed by
April 14 2015. Piping and supports were
installed inside the tower in parallel as the
tower modules were erected. The plant
tie-in windows were completed on April
24, 2015.
hammer issue with innovative, but simple
solution and met the NRC commitment,”
said Daljit Mand, manager of Design
Engineering.
All the preliminary acceptance
criteria were met regarding the physical
observations. Flanges that had historically
leaked were intact, and plant walk
downs revealed no impact on insulation
or supports. Video footage showed
virtually no movement at key locations.
The predicted pressure values in the
engineering modeling of the modification
closely matched the measured values.
In addition, the modification is easy
to maintain and operate – the system is
largely passive, requiring no operator
action during a design basis loss of offsite
power event.
Contact: Jaime McCoy, Wolf Creek
Nuclear Operating Corporation, 1550
Oxen Lane, NE, P.O. Box 411, Burlington,
Kansas 66839; telephone: (620) 364-
8831, ext. 8640.
