Ultrasonic Examination of Double-Shell Tank 241-AY-101. Examination Completed March 2007. Page: 4 of 34
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Summary
AREVA NC Inc., under a contract from CH2M Hill Hanford Group, has performed an ultrasonic
examination of selected portions of Double-Shell Tank 241-AY-101. The purpose of this examination
was to provide information that could be used to evaluate the integrity of the wall of the primary tank.
The requirements for the ultrasonic examination of Tank 241-AY-101 were to detect, characterize
(identify, size, and locate), and record measurements made of any wall thinning, pitting, or cracks that
might be present in the wall of the primary tank. Any measurements that exceed the requirements set
forth in the Engineering Task Plan, RPP-Plan-27202 (Jensen 2005) and summarized on page 1 of this
document, are to be reported to CH2M Hill Hanford Group and the Pacific Northwest National
Laboratory for further evaluation. Under the contract with CH2M Hill Hanford Group, all data is to be
recorded on electronic media and paper copies of all measurements are provided to Pacific Northwest
National Laboratory for third-party evaluation. Pacific Northwest National Laboratory is responsible for
preparing a report(s) that describes the results of the AREVA NC Inc. ultrasonic examinations.
Examination Results
The results of the examination of Tank 241-AY-101 have been evaluated by Pacific Northwest
National Laboratory personnel. The primary tank ultrasonic examination consisted of one vertical 15-in.-
wide scan path over the entire height of the tank, the heat-affected zone of five vertical welds and one
horizontal weld from Riser 88 and one vertical 15-in.-wide scan path over the entire height of the tank
from Riser 89. Additionally, three horizontal scans were performed at the liquid-air interface region from
riser 88. The examinations were performed to detect any wall thinning, pitting, or cracking in the
primary tank wall.
Primary Tank Wall Vertical Scan Paths
One 15-in.-wide vertical scan path was performed on Plates #1, #2, #3, #4, and #5 from Riser 88.
The plates were examined for wall thinning, pitting, and cracks oriented vertically on the primary tank
wall.
" Plate #1 results indicate no areas that exceed the minimum thinning reportable level of 10% of the
nominal thickness. No pitting or vertical crack-like indications were detected in Plate #1.
" Plate #2 results indicate one area with minimum thickness of 0.434-in. exceeds the minimum
thinning reportable level of 10% of the nominal thickness. No pitting or vertical crack-like
indications were detected in Plate #2.
" Plate #3 results indicate seven areas that exceed the minimum thinning reportable level of 10% of
the nominal thickness. However, these seven areas (with remaining ligament of 0.430-in., 0.439-
in., 0.440-in., 0.442-in., 0.444-in., 0.444-in., and 0.444-in.) were analyzed by the ultrasonic
testing (UT) Level III and were considered pit-like and therefore do not exceed the reportable
pitting level of 25% of the nominal thickness. No vertical crack-like indications were detected in
Plate #3.ii
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Pardini, Allan F. & Weier, Dennis R. Ultrasonic Examination of Double-Shell Tank 241-AY-101. Examination Completed March 2007., report, June 1, 2007; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc877854/m1/4/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.