SRNL Shelf Life Studies – SCC Studies at Room Temperature.

摘要

An integrated test plan by Savannah River (SRNL) and Los Alamos (LANL) National Laboratories was initiated in 2009 to focus studies on the susceptibility of 3013 storage containers to stress corrosion cracking (SCC). These corrosion studies were designed to validate the assumptions in the Department of Energy (DOE) Standard DOE-STD- 3013 as well as provide essential information to augment field surveillance data collected at 3013 storage sites [2]. Important variables included the influence of temperature, salt composition, moisture, residual stress and exposure (salt contact or vapor space over thesalt) on the relative humidity (RH) inside a 3013 container and the initiation and propagation of SCC. At SRNL, the studies evaluated the impact of moisture and exposure conditions on SCC initiation including its occurrence in conjunction with corrosion pits. The last series of tests were conducted at low water loading (0.2 wt%) to evaluate water loading conditions that had been reported during packaging and to determine if relative humidity conditions closer to the salt deliquescence point were more aggressive as suggested by the literature [5, 6]. These tests were completed in FY14 andthe results are presented herein.