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Detecting and imaging stress corrosion cracking in stainless steel, with application to inspecting storage canisters for spent nuclear fuel

Journal Article · · NDT & E International
 [1];  [2];  [3];  [1];  [2];  [2];  [4];  [4];  [1];  [1];  [5];  [6]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. North Carolina State Univ., Raleigh, NC (United States). Dept. of Nuclear Engineering
  3. Tohoku Univ., Sendai (Japan). Dept. of Materials Processing
  4. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  5. Brigham Young Univ., Provo, UT (United States). Dept. of Physics and Astronomy
  6. Colorado School of Mines, Golden, CO (United States). Dept. of Physics

One of the primary concerns with the long-term performance of storage systems for spent nuclear fuel (SNF) is the potential for corrosion due to deliquescence of salts deposited as aerosols on the surface of the canister, which is typically made of austentic stainless steel. In regions of high residual weld stresses, this may lead to localized stress-corrosion cracking (SCC). The ability to detect and image SCC at an early stage (long before the cracks are susceptible to propagate through the thickness of the canister wall and leaks of radioactive material may occur) is essential to the performance evaluation and licensing process of the storage systems. In this paper, we explore a number of nondestructive testing techniques to detect and image SCC in austenitic stainless steel. Our attention is focused on a small rectangular sample of 1× 2 in2 with two cracks of mm-scale sizes. The techniques explored in this paper include nonlinear resonant ultrasound spectroscopy (NRUS) for detection, Linear Elastodynamic Gradient Imaging Technique (LEGIT), ultrasonic C-scan, vibrothermography, and synchrotron X-ray diffraction for imaging. Results obtained from these techniques are compared. Cracks of mm-scale sizes can be detected and imaged with all the techniques explored in this study.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE)
Grant/Contract Number:
AC04-94AL85000; NE0008442
OSTI ID:
1810393
Alternate ID(s):
OSTI ID: 1576656
OSTI ID: 1598007
Report Number(s):
SAND--2021-3574J; 697267
Journal Information:
NDT & E International, Journal Name: NDT & E International Vol. 109; ISSN 0963-8695
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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