Tenth interim status report: Model 9975 O-ring fixture long-term leak performance

Daugherty, W. L.¹ 

[1] Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)

关键词: K-area;    Viton;    service life;   

DOI  :  10.2172/1214166
RP-ID  :  SRNL-TR--2015-00205
PID  :  OSTI ID: 1214166

美国|英语

来源: SciTech Connect

【 摘 要 】

A series of experiments to monitor the aging performance of Viton^?? GLT O-rings used in the Model 9975 package has been ongoing since 2004 at the Savannah River National Laboratory. One approach has been to periodically evaluate the leak performance of O-rings being aged in mock-up 9975 Primary Containment Vessels (PCVs) at elevated temperatures. Other methods such as compression-stress relaxation (CSR) tests and field surveillance are also on-going to evaluate O-ring behavior. Seventy tests using PCV mock-ups were assembled and heated to temperatures ranging from 200 to 450 ?��F. They were leak-tested initially and have been tested periodically to determine if they continue to meet the leak-tightness criterion defined in ANSI standard N14.5-97. Due to material substitution, fourteen additional tests were initiated in 2008 with GLT-S O-rings heated to temperatures ranging from 200 to 400 ?��F.