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Title: Investigating grid-to-rod fretting wear of nuclear fuel claddings using a unique autoclave fretting rig

Abstract

Fuel rods in a pressurized water nuclear reactor (PWR) experience coolant flow-induced relative motion against the grid support features, a phenomenon called grid-to-rod fretting (GTRF), which may cause progressive fretting wear damage. Wear-through of the cladding on fuel rods will leak the radioactive fuel into the coolant loop to significantly increase the radiation level in PWR primary loop and often trigger expensive Post Irradiation Examination. In this work, a unique autoclave fretting test rig was designed and fabricated to allow studying GTRF using actual cladding and grid materials. Water temperature was up to 220 °C, which was designed to mimic the environment in an industry full-assembly reactor core simulator. The contact load (0.1–1 N), oscillation frequency (20–30 Hz) and stroke (50–150 µm), and work rate (1–3 mW) were defined based on simulations of GTRF in an actual reactor. Using this autoclave GTRF rig, tests were conducted to learn the effect of water temperature and to investigate the wear behavior of different cladding-grid material combinations currently used in actual PWRs, including Zr alloy claddings without and with pre-oxidation against Zr alloy and Inconel grids. Higher water temperature evidently increased the cladding wear, and pre-oxidation of the Zr alloy and/or using themore » Inconel grid effectively reduced the wear rate. In conclusion, results were correlated with the data of a full-size industry reactor core simulator in terms of both wear rate and wear scar morphology.« less

Authors:
ORCiD logo [1];  [2];  [3];  [3];  [4]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  2. Westinghouse Electric Company, Hopkins, SC (United States)
  3. Phoenix Tribology Ltd, Hampshire (United Kingdom)
  4. Blau Tribology Consulting, Enka, NC (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1474636
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Wear
Additional Journal Information:
Journal Volume: 412-413; Journal Issue: C; Journal ID: ISSN 0043-1648
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; Grid-to-rod fretting (GTRF); Autoclave; Zirconium; Inconel; Wear coefficient

Citation Formats

Lazarevic, Sladjan, Lu, Roger Y., Favede, Cyrille, Plint, George, Blau, Peter J., and Qu, Jun. Investigating grid-to-rod fretting wear of nuclear fuel claddings using a unique autoclave fretting rig. United States: N. p., 2018. Web. doi:10.1016/j.wear.2018.06.011.
Lazarevic, Sladjan, Lu, Roger Y., Favede, Cyrille, Plint, George, Blau, Peter J., & Qu, Jun. Investigating grid-to-rod fretting wear of nuclear fuel claddings using a unique autoclave fretting rig. United States. doi:10.1016/j.wear.2018.06.011.
Lazarevic, Sladjan, Lu, Roger Y., Favede, Cyrille, Plint, George, Blau, Peter J., and Qu, Jun. Thu . "Investigating grid-to-rod fretting wear of nuclear fuel claddings using a unique autoclave fretting rig". United States. doi:10.1016/j.wear.2018.06.011. https://www.osti.gov/servlets/purl/1474636.
@article{osti_1474636,
title = {Investigating grid-to-rod fretting wear of nuclear fuel claddings using a unique autoclave fretting rig},
author = {Lazarevic, Sladjan and Lu, Roger Y. and Favede, Cyrille and Plint, George and Blau, Peter J. and Qu, Jun},
abstractNote = {Fuel rods in a pressurized water nuclear reactor (PWR) experience coolant flow-induced relative motion against the grid support features, a phenomenon called grid-to-rod fretting (GTRF), which may cause progressive fretting wear damage. Wear-through of the cladding on fuel rods will leak the radioactive fuel into the coolant loop to significantly increase the radiation level in PWR primary loop and often trigger expensive Post Irradiation Examination. In this work, a unique autoclave fretting test rig was designed and fabricated to allow studying GTRF using actual cladding and grid materials. Water temperature was up to 220 °C, which was designed to mimic the environment in an industry full-assembly reactor core simulator. The contact load (0.1–1 N), oscillation frequency (20–30 Hz) and stroke (50–150 µm), and work rate (1–3 mW) were defined based on simulations of GTRF in an actual reactor. Using this autoclave GTRF rig, tests were conducted to learn the effect of water temperature and to investigate the wear behavior of different cladding-grid material combinations currently used in actual PWRs, including Zr alloy claddings without and with pre-oxidation against Zr alloy and Inconel grids. Higher water temperature evidently increased the cladding wear, and pre-oxidation of the Zr alloy and/or using the Inconel grid effectively reduced the wear rate. In conclusion, results were correlated with the data of a full-size industry reactor core simulator in terms of both wear rate and wear scar morphology.},
doi = {10.1016/j.wear.2018.06.011},
journal = {Wear},
number = C,
volume = 412-413,
place = {United States},
year = {2018},
month = {6}
}

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