FIRST INTERIM STATUS REPORT: MODEL 9975 LIFE EXTENSION PACKAGE TESTING

Daugherty, W. ; Stefek, T.

Savannah River Site (S.C.)

关键词: Corrosion;    Aging;    Storage;    Testing;    Monitoring;   

DOI  :  10.2172/969996
RP-ID  :  SRNL-TR-2009-00439
RP-ID  :  DE-AC09-08SR22470
RP-ID  :  969996

美国|英语

来源: UNT Digital Library

【 摘 要 】

Three 9975 packages have been instrumented and exposed to bounding storage conditions to help identify the extent to which laboratory test results for fiberboard, O-rings and other components apply within a full-scale package. To date, changes observed in the fiberboard overpack and Oring seals are generally consistent with the behavior of laboratory samples. The lead shield within each package has developed a corrosion layer of lead carbonate, consistent with other 9975 packages. However, the morphology of the corrosion layer is different within these packages, possibly as a result of the severity of the conditioning environments beyond normal service conditions. Conditioning of the second package, LE2, has been discontinued due to the degree of degradation of the fiberboard, and its components have received a final examination. Additional testing will be performed on samples removed from the fiberboard assembly to verify its final condition. The other two packages will continue in test. This is an interim status report for experiments carried out per Task Technical Plan WSRC-TR-2005-00014 [1], which is part of the comprehensive 9975 package surveillance program [2]. The primary goal of this task is to validate aging models currently under development based on lab scale testing of the fiberboard overpack and containment vessel O-rings. A secondary goal is to examine the behavior of the lead shielding under bounding conditions. This task provides an integrated assessment of the package response to environmental extremes, and demonstrates the extent to which data from small samples scale up to a full package. Three 9975 packages have been modified to provide instrumentation for monitoring package response and performance to environmental aging. Each package has a different environmental exposure history.