Status report. Characterization of Weld Residual Stresses on a Full-Diameter SNF Interim Storage Canister Mockup.

Abstract

SAND2015-7068R Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000. DISCLAIMER This information was prepared as an account of work sponsored by an agency of the U.

SNF Interim Storage Canister Corrosion and Surface Environment Investigations

“…SNL purchased a full diameter cylindrical mockup of an interim storage canister, made using the same materials and manufacturing processes as one type of in-service canister, in 2014, and is in the process of characterizing the material properties of the canister base metal and weld zones. The status of the mockup characterization work was recently summarized in Enos and Bryan (2015); a short summary is presented here in Section 4. The mockup will provide information on material properties for developing corrosion testing protocols using relevant materials, and will also provide actual samples for testing purposes.…”

“…Typical weld residual stresses for one type of interim storage canister are being obtained by characterization of the SNL full diameter mockup. As noted previously, the status of the mockup characterization work was recently provided in Enos and Bryan (2015), but a short summary is presented here in Section 4.…”

“…SNL is in the process of characterizing the material properties of the canister base metal and weld zones. The status of the mockup characterization work was recently provided in Enos and Bryan (2015); a short summary is presented here.…”

Selection of Shear Horizontal Wave Transducers for Robotic Nondestructive Inspection in Harsh Environments

“…The canister degradation mode of most significant concern is chloride induced stress corrosion cracking (CISCC) [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ], which is most likely to occur in the heat affected zone of full penetration welds in the canister. Based on the thermal residual stress state [ 10 , 11 , 12 ], the cracks are expected to grow transverse to the weld line, or possibility along it. Many NDI techniques could be used to detect CISCC, e.g., magnetic particles, dye penetrant, eddy currents, bulk wave ultrasonics, but here ultrasonic guided waves are investigated in order to: (i) provide 100% volumetric coverage of the canister; (ii) make measurements with a robotic system; (iii) enable the use of noncontact transducers; and (iv) have the potential for both detection and sizing of cracks.…”