9975 SHIPPING PACKAGE LIFE EXTENSION SURVEILLANCE PROGRAM RESULTS SUMMARY Page: 10 of 27
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SRNS-STI-2010-00763
Rev. 0
inside 9975 shipping packages. The surveillance approach uses a combination of
NDE/DE field surveillance and lab testing to validate the 9975 performance assumptions
of the safety basis, similar to the 3013 surveillance program. The 9975 shipping
packages are expected to maintain safety performance in KAC beyond the normal period
of certification as shipping packages based on engineering judgment and limited material
performance data [9].
The field surveillances include NDE techniques (e.g. visual inspections, dimensional and
weight measurements) on a limited set of 9975 packages to provide additional confidence
that the material performance properties continue to meet their functional requirements.
Acceptance criteria for field surveillance of the 9975 packages were developed. When an
acceptance criterion is exceeded, the Surveillance Program Authority (SPA) initiates an
evaluation to determine if the finding is deleterious to the package performance [4].
Laboratory tests examine the 9975 material components (e.g. O-rings & fiberboard) at the
bounding storage conditions as defined in the safety basis and monitor material properties
and safety function performance over time. The tests are designed to accelerate material
aging (via humidity, temperature, and radiation effects) and monitor and trend material
properties in order to lead the actual field conditions. Additionally, the tests are designed
to characterize and predict material changes (degradation) over time at the bounding
conditions allowed in the safety basis before they are observed during field surveillance.
O-Ring Performance - Containment
Field Surveillance - Actual Conditions:
The predominant degradation mechanism for the containment vessel O-rings in 9975
packages is expected to be compression stress-relaxation or loss of sealing force due to
long term exposure at elevated temperatures. Degradation due to radiation is much less
likely at the bounding dose rates involved.
O-rings obtained from field surveillance activities following up to 8 years of storage in
KAC have shown on average a small degree of compression set (-23%) based on
nominal dimensions with no other evidence of degradation. The examined O-rings are
observed to recover practically all roundness, with hardness and tensile properties similar
to those of non-aged O-rings. The O-rings retain high flexibility and resiliency.
Visually, there is no difference between the O-rings removed during field surveillance
(-23% compression set) and new O-rings.
The O-rings examined to date have not been from maximum payload packages and have
not seen postulated peak normal or accident conditions. In KAC the packages have been
consistently stored well below 162 F, with the maximum recorded ambient temperature
in KAC being 106 F [18]. This translates to a peak O-ring temperature of -144 F for a
12W payload, and a peak O-ring temperature of -166 F for a maximum 19 W payload.
Therefore, the O-rings stored in KAC have yet to approach the calculated peak normal
temperature of 200 F. It is important to note that peak temperatures are not sustained on10 of 27
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Daugherty, W.; Dunn, K.; Hackney, B.; Hoffman, E. & Skidmore, E. 9975 SHIPPING PACKAGE LIFE EXTENSION SURVEILLANCE PROGRAM RESULTS SUMMARY, report, January 6, 2011; United States. (https://digital.library.unt.edu/ark:/67531/metadc837187/m1/10/: accessed April 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.