Fracture toughness evaluation for Zr-4 clad tubing structure with pellet inserts

Wang, Jy-An John

doi:10.1016/j.tafmec.2020.102657

Fracture toughness evaluation for Zr-4 clad tubing structure with pellet inserts

Journal Article · Thu May 28 00:00:00 EDT 2020 · Theoretical and Applied Fracture Mechanics

DOI:https://doi.org/10.1016/j.tafmec.2020.102657· OSTI ID:1649550

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Applying fracture mechanics approach to spent nuclear fuel (SNF) system reliability investigation is warranted due to the inherent flaws and hydride structures existed in a SNF system after nuclear reactor operation. However, none of the existing fracture toughness data deal with fuel cladding specific geometry or spent fuel material conditions, such as cladding structure with the pellet-inserts and the associated pellet clad mechanical interactions induced mixed-mode damage mechanisms. Thus, the development of an intrinsic fracture mechanics approach that is suitable for SNF materials is needed. Due to thin wall and small dimension of clad tubing structure, the spiral notch torsion test (SNTT) method of small specimen approach was used to estimate the clad tubing structure fracture toughness. The estimated fracture toughness for Zr-4 cladding with alumina-pellet inserts are presented in this report. For SNTT samples with a short or medium crack length, between 5.4-mm and 8-mm, the estimate JIQ upon fracture initiation for the baseline Zr-4 cladding is at 50 kJ/m2 with 2-sigma uncertainty of 3.26 kJ/m2, and the associated KIQ is at 67.46 MPa√m. For SNTT samples with a long crack length, around 13-mm, the crack initialization is deviated from that of the Mode-I tensile fracture and appears to be a mixed-mode fracture of Mode I – tensile stress and Mode III – out of plane shear stress; the estimated JMQ is at 18.9 kJ/m2, the associated KMQ is at 41.4 MPa√m.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1649550

Alternate ID(s):: OSTI ID: 1632767

Journal Information:: Theoretical and Applied Fracture Mechanics, Journal Name: Theoretical and Applied Fracture Mechanics Journal Issue: N/A Vol. 108; ISSN 0167-8442

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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