NR-1 nut to support stem seal test Page: 1 of 9
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r : Engineering Mechanics
Itk : June 22, 1967
Subject : NR-1 Nut to Support
Stem Seal Tcst
WESTINGHOUSE ASTRONUCLEAR LABORATORY ' err[
Advanced Reactor Design
cc: L. H. Cooper
N. J. Ettenson
H. S. McCreary
C. L. Meuche
E. A. Watjen
The purpose of the NR-1 nut to support stem seal test was to evaluate the perfor-
mance of the metal-to-metal seal shown in Figure 1. This configuration was proposed
for use in the NR-1 plena. This 304 stainless steel seal was to be tested in a helium
atmosphere under a 500 psid pressure gradient. Tests were conducted at ambient,
cryogenic, and with a 6000R gradient across the seal interface.
The test fixture (WT701615) shown in Figure 2 was built to simulate the support
stem configuration in the area of the seal. A 32 finish was requested on the seal int-r-
face of the seal jacket and nut. The seal was tested at 1400R, 5300R, and with a 4500R
to 1050oR gradient across the seal. The gradient was established with the low pressure
end in a furnace (Figure 3) while cooling the high pressure end in LN2. Thermocouples
to monitor the thermal gradient are shown in Figures 2 and 3.
The surface finish on the seal jacket was most difficult to inspect. No vendor
could be found to inspect an unsectioned seal jacket at the seal interface. Therefore,
one jacket not used in testing was sectioned near the metal seal interface and sent to
Brush Instruments in Cleveland for inspection on a Surfanalyzer Model 150. The results
of this surface finish inspection are illustrated in Figure 4. The top trace is a profile
of the surface and shows two machining scratches. The lower trace indicates that the
surface finish is between 20 and 24. Although only one jacket was sectioned and
inspected it is reasonable to assume that all seal finishes on the jacket were approximately
20 - 24. The nut seal finish was inspected by WANL Quality Control to a 32 finish.
t, report was sca dS INFORMATION CATEGORY
ponsored by the Unuted States Government. Neither
the United States nor the United States Energy
Research and Development Admimstration, nor any of (
their employees, nor any of their contractors,
subcontractors, or their employees, makes any
warranty, express or imphed, or assumes any legal
ihabity or responsibility for the accuracy, completeness /CC C t Gt y ( -
or usefulness of any formation, apparatus, product Authorized Classifier Date
process disclosed, or represents that its use would not
infnnge privately owned rights
FO.., 150I -. t.,
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Thomson, J.D. NR-1 nut to support stem seal test, report, June 22, 1967; Pittsburgh, Pennsylvania. (https://digital.library.unt.edu/ark:/67531/metadc880370/m1/1/: accessed April 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.