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Discerning the effect of various irradiation modes on the corrosion of Zircaloy-4

Journal Article · · Journal of Nuclear Materials
 [1];  [2];  [2];  [3];  [4];  [5];  [6];  [1]
  1. University of Michigan, Ann Arbor, MI (United States)
  2. Naval Nuclear Laboratory, West Mifflin, PA (United States)
  3. Pennsylvania State University, University Park, PA (United States)
  4. Framatome Inc., Lynchburg, VA (United States)
  5. Framatome, Lyon (France)
  6. Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Using proton irradiation, this study investigates the individual influence of several factors on the corrosion kinetics of Zircaloy-4 in a hydrogenated water environment simulating a Pressurized Water Reactor (PWR). Using both simultaneous irradiation-corrosion and autoclave corrosion, we separately examine: (i) the effect of pre-irradiation on modifying the structure of the material, (ii) the impact of irradiation on creating defects in the growing oxide layer during corrosion, and (iii) the influence of irradiation on increasing the corrosion potential through radiolysis during corrosion. To replicate neutron-irradiated microstructure, two proton pre-irradiation schedules were employed: Schedule 1 (isothermal irradiation at 350 °C to 5 dpa) to simulate high-temperature PWR conditions, and Schedule 2 (two-step process: irradiation to 2.5 dpa at -10 °C followed by 2.5 dpa at 350 °C) to simulate lower temperature PWR and Boiling Water Reactor (BWR) conditions. Long-term autoclave corrosion testing over 360 days at 320 °C revealed no significant difference between unirradiated samples and those pre-irradiated according to either schedule, with all samples exhibiting sub-cubic kinetics within the pre-transition regime. Irradiated samples underwent Simultaneous Irradiation Corrosion (SIC) tests, corroding in 320 °C water while being irradiated with protons. Corrosion was found to accelerate in all SIC-tested samples relative to autoclave conditions, with the greatest increase observed in non-pre-irradiated samples. Pre-irradiation with either schedule resulted in a slower corrosion rate compared to non-pre-irradiated regions under SIC conditions. The degree of radiolysis observed in the SIC tests surpassed typical PWR conditions, approaching levels found in BWRs. Radiolysis products were identified as the primary contributors to accelerated corrosion, corroborated by radiolysis bar tests. Furthermore, these findings underscore the intricate interactions between irradiation, corrosion, and water chemistry in determining Zircaloy-4 corrosion kinetics within nuclear reactor environments.
Research Organization:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Organization:
USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
89233018CNR000004; AC07-05ID14517
OSTI ID:
2583951
Alternate ID(s):
OSTI ID: 2477471
Report Number(s):
INL/JOU--24-80040
Journal Information:
Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Journal Issue: 1 Vol. 604; ISSN 0022-3115
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (26)

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How the crystallography and nanoscale chemistry of the metal/oxide interface develops during the aqueous oxidation of zirconium cladding alloys journal December 2012
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Some thoughts on the mechanisms of in-reactor corrosion of zirconium alloys journal February 2005
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Origin and effect of lateral cracks in oxide scales formed on zirconium alloys journal November 2012
A facility for studying irradiation accelerated corrosion in high temperature water journal August 2014
Transmission electron microscopy characterization of Zircaloy-4 and ZIRLO™ oxide layers journal January 2015
Hydrothermal corrosion of SiC in LWR coolant environments in the absence of irradiation journal October 2015
Determination of dose rate effects on Zircaloy oxidation using proton irradiation and oxygen transport modeling journal September 2019
Effect of radiation damage and water radiolysis on corrosion of FeCrAl alloys in hydrogenated water journal May 2020
The effects of neutron and ionizing irradiation on the aqueous corrosion of SiC journal August 2020
Corrosion behavior of ferritic FeCrAl alloys in simulated BWR normal water chemistry journal March 2021
Emulation of neutron damage with proton irradiation and its effects on microstructure and microchemistry of Zircaloy-4 journal December 2021
Investigation of breakaway corrosion observed during oxide growth in pure and low alloying element content Zr exposed in water at 360°C journal January 2022
Reproducing shadow corrosion on Zircaloy-2 using in-situ proton irradiation journal January 2022
Untangling competition between epitaxial strain and growth stress through examination of variations in local oxidation journal January 2023
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