Helium/solid powder O-ring leakage correlation experiments using a radiotracer Page: 4 of 7
This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to UNT Digital Library by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
-3-
Post-test Sampling
At the completion of a test, all plumbing above valves V3, V8 and V4 is
removed. Three washes of approximately 8N HN33 are circulated through the
test cavity to dissolve any U02 tracer present. All washes are combined
and gamma ray counted on a Ge(Li) detector to determine the amount of tracer
that passed the 0-ring seal.
RESULTS
Table 1 shows the experimental conditions for the tests and the results.
U02 was detected in three tests; upper limits are reported for the others.
CONCLUSIONS
U02 definitely leaked past the 0-ring in three of the tests confirming
the major results of the previous work.1 Continuous leakage at these levels
may require additional precautions under present regulatory policies.
The mechanism and the time and particle size dependence for the leakage
are not known, but there is some indication leakage is more likely at low
temperatures. It is possible leakage is due to movement of the O-ring
during temperature or pressure cycling at the beginning or end of a test.
The radiotracer method involves less labor and is much less susceptible to
contamination than the previous method. Future work will investigate
leakage past lubricated 0-rings and time dependence of leakage.
REFERENCE
1. W. B. Leisher, S. H. Weissman, D. R. Tallant, M. Kubo.
Helium/Solid Powder 0-ring Leakage Correlation Experiments.
Proc. 7th International Symposium on Packaging and Transportation
of Radioactive Materials, May 15-20, 1983, New Orleans, LA. ORNL
CONF. -830528, 1983.
Upcoming Pages
Here’s what’s next.
Search Inside
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Bild, R. W.; Leisher, W. B.; Weissman, S. H. & Seya, M. Helium/solid powder O-ring leakage correlation experiments using a radiotracer, report, January 1, 1984; Albuquerque, New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1053334/m1/4/?rotate=90: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.