COATED CLADDING BEHAVIOR DURING HIGH-TEMPERATURE TRANSIENTS

Authors

  • Adéla Chalupová Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Department of Nuclear Reactors, V Holešovickách 2, 180 00 Prague 8, Czech Republic UJP PRAHA a.s., Nad Kamínkou 1345, 156 10 Prague – Zbraslav, Czech Republic
  • Jakub Krejčí UJP PRAHA a.s., Nad Kamínkou 1345, 156 10 Prague – Zbraslav, Czech Republic
  • Ladislav Cvrček Czech Technical University in Prague, Faculty of Mechanical Engineering, Department of Materials Engineering, Karlovo námestí 13, 121 35 Prague 2, Czech Republic
  • Martin Ševeček Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Department of Nuclear Reactors, V Holešovickách 2, 180 00 Prague 8, Czech Republic
  • Vojtěch Rozkošný UJP PRAHA a.s., Nad Kamínkou 1345, 156 10 Prague – Zbraslav, Czech Republic
  • Antonín Přibyl UJP PRAHA a.s., Nad Kamínkou 1345, 156 10 Prague – Zbraslav, Czech Republic
  • Patricie Halodová Research Centre Rež, Hlavní 130, 250 68 Husinec-Rež, Czech Republic
  • Petra Gávelová Research Centre Rež, Hlavní 130, 250 68 Husinec-Rež, Czech Republic

DOI:

https://doi.org/10.14311/APP.2019.24.0009

Keywords:

Nuclear fuel, fuel cladding, LOCA, ATF, coating, PVD.

Abstract

The concept of accident-tolerant fuels has been proposed and widely investigated over the past decade. The contribution is focused on one of the near-term approaches - the modification of the surface of existing Zr-alloy claddings by protective coatings. The studied specimens are based on Zr-1%Nb substrate with chromium coating, multicomponent chromium nitride and chromium coating and multi-layer chromium nitride/chromium coating deposited by a physical vapor deposition process. Thermomechanical tests were designed to understand the cladding deformation and the burst conditions during the LOCA phenomena. Presented results show both the positive and the negative effect of coating on cladding behavior. All coatings exhibited a reduction of ballooning size and prolongation of time to burst. On the contrary, coating can be connected with larger opening size after burst, higher hydrogen content and deterioration of the local mechanical properties.

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Published

2019-12-06

Issue

Vol. 24 (2019): ŠIMÁNĚ 2019

Section

Articles

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