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agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness, of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. References herein to any specific commercial product, process, or service by trade name, trade mark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the U.S. Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the U.S. Government or any agency thereof. SUMMARY The purpose of ring compression testing is to generate data to support the development of the technical basis for extended storage and transportation of high-burnup fuel. Argonne National Laboratory developed the methodology of using ring compression tests (RCTs) for radial-hydride-treated (RHT) cladding to generate data for the Nuclear Regulatory Commission (NRC) on the behavior of high-burnup Zircaloy-4 (Zry-4) and ZIRLO™ cladding. The RHT/RCT methodology is an established test protocol accepted by NRC for generating data to support the technical basis for licensing storage and transportation casks with high-burnup fuel. In July 2011, Phase I testing for DOE on high-burnup M5 ® cladding was initiated under the ANL FY11 Work Package Transportation; Phase I testing for DOE on high-burnup M5 ® cladding continued into fiscal year 2012 under the ANL FY12 Work Package Engineering Materials Experimental. This report highlights the results of completed Phase I testing of high-burnup M5 ® cladding and the revised three-year test plan, which is included in the Appendix. Relative to lower-burnup fuel, high-burnup (≥45 GWd/MTU) used fuel rods are characterized by increased: decay heat following reactor discharge, internal gas pressure, cladding corrosion-layer thickness, and cladding hydrogen content. Under pool-storage conditions following reactor discharge, hydrogen in fuel cladding will be in the form of hydrides precipitated in the circumferential direction. Circumferential hydrides, in combination with irradiation-induced hardening, decrease cladding ductility in response to axial and hoop loads, but high-burnup cladding still retains a low level of ductility. At elevated temperatures (≤400°C) during drying-transfer operations and the early stage of dry-cask storage, the internal gas pressure and cladding hoop stress increase, as some of the hydrogen goes into solution (e.g., about 200 wppm at 400°C). During cooling under tensile hoop stress, some of the dissolved hydrogen will re-precipitate in the radial direction …

Used Fuel Disposition Campaign Phase I Ring Compression Testing of High-Burnup Cladding