Preliminary Chemical Aging and Lifetime Assessment for High Density S5370

Maxwell, R S ; Chinn, S

Lawrence Livermore National Laboratory

关键词: Aging;    Testing;    37 Inorganic, Organic, Physical And Analytical Chemistry;    36 Materials Science;    38 Radiation Chemistry, Radiochemistry, And Nuclear Chemistry;   

DOI  :  10.2172/15013917
RP-ID  :  UCRL-TR-201838
RP-ID  :  W-7405-ENG-48
RP-ID  :  15013917

美国|英语

来源: UNT Digital Library

【 摘 要 】

A preliminary lifetime assessment of S5370 stress cushions has been performed. Data from three sources were obtained and reviewed to perform this assessment. The sources were the following: (1) the Los Alamos National Laboratory and Honeywell FM&T Kansas City Plant's 2-year and 9-year accelerated aging studies; (2) a large selection of weapon surveillance return data; (3) laboratory experiments at Lawrence Livermore National Laboratory and Honeywell FM&T Kansas City Plant on artificially aged material. The general conclusions of this study are as follows: (1) There is an inherently large degree of structural and chemical heterogeneity in S5370 cushions that complicates lifetime assessments; (2) Current surveillance testing procedures are inadequate for providing insight into aging trends; (3) LANL PMAP data suggests a 60 year load retention of greater than 40%; however, this is for low density versions and extrapolation to high density must be performed with caution and a new set of testing is recommended; (4) Results of chemical aging assessments suggest that radiation damage is minimal at stockpile relevant doses, thermal degradation leads to compression set due to disentanglement of the network structure over time and a negligible amount of chain scissioning at relevant temperatures. The compression set is accelerated by exposure to radiation; (5) In the absence of further testing, a 60-year load retention of greater than 40% is estimated.