Compatibility and Outgassing Studies for Directed Stockpile Work (FY05)

Alviso, C ; Harvey, C ; Vance, A

Lawrence Livermore National Laboratory

关键词: Removal;    Polyurethanes;    Aging;    Organic Compounds;    Stockpiles;   

DOI  :  10.2172/890003
RP-ID  :  UCRL-TR-217476
RP-ID  :  W-7405-ENG-48
RP-ID  :  890003

美国|英语

来源: UNT Digital Library

【 摘 要 】

Compatibility and outgassing studies of non-nuclear materials were carried out in support of the W80 Life Extension Program. These studies included small-scale laboratory experiments as well as participation in Sandia's Materials Aging and Compatibility test (MAC-1). Analysis of the outgassing signature of removable epoxy foam (REF) revealed unusually high levels of volatile organic compounds in the material. REF was replaced with the polyurethane PMDI. Laboratory compatibility tests of high priority materials were performed and revealed incompatibilities between Viton A (LX-07 binder) and syntactic polysulfide as well as Viton A and REF. With the removal of REF from the system, the incompatibility with Viton A is not an issue. In the case of the viton/polysulfide, both of these materials have a history of reliability in the stockpile, and the observed results, while scientifically interesting, appear to be a laboratory anomaly. Participation in the MAC-1 test led to a detailed study of Viton A degradation. At elevated temperatures up to 70 C, the Viton A samples darkened and exhibited increased crosslinking. Laboratory experiments were pursued to correlate the observed changes to exposure to specific compounds that were present in the MAC-1 canister atmospheres. Exposure to siloxanes resulted in changes similar to those seen in the MAC-1 samples. Knowledge gained from the MAC-1 test will be applied to the upcoming MAC-2 test planned for FY06. Finally, the suitability of isotopically labeled nitrogen fill gas ({sup 15}N{sub 2}) was addressed. This gas will behave as standard nitrogen with no compatibility concerns expected.