Chemical--Mechanical Cleaning of Small-Diameter Tubing. Page: 5 of 17
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OF SMALL-DIAMETER TUBING
R. R. Studer
Assuring internal cleanliness of small-diameter tubing has
been a continuing problem. One effective cleaning method
requires prolonged, vigorous brushing. A machine was designed
to perform this operation.
One requirement of FTR fuel cladding tubes is freedom
from contaminating substances, particularly on internal sur-
faces. Other technical requirements of the tubes can only be
met by tube manufacturing methods which, inherently, make
cleaning difficult. Visual or mechanical examination of small-
diameter tubes to determine presence or absence of gross soils
is uncertain and may be damaging. The best assurance of uni-
form cleanliness is a completely effective cleaning operation.
Such an operation has been developed, and a brushing/rinsing
machine has been designed to make it practical. The machine
was designed to give maximum protection to the tube being
FTR fuel cladding is furnished as small-diameter, 300-
series stainless steel tubing. The tubing is finished and
used in the 20% cold-drawn condition. Dimensional requirements
make free-sink drawing to final size impractical. Mandrel
drawing is likewise impractical because reeling to free the
mandrel induces dimensional and residual stress changes in
the tube which compromise the validity of ultrasonic and eddy
current nondestructive testing results.
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Studer, R. R. Chemical--Mechanical Cleaning of Small-Diameter Tubing., report, January 1, 1970; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc869565/m1/5/: accessed April 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.