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Behavior of chromium coated M5 claddings upon thermal ramp tests under internal pressure (loss-of-coolant accident conditions)

Abstract : It has been previously shown that Cr-coatings, even with a thickness limited to 10-15µm, can have a positive impact on the high temperature isothermal creep and burst behavior of the cladding under internal pressure, typical of hypothetical LOss-of-Coolant Accident (LOCA) situations. Then, in view of being more representative of LOCA conditions, thermal ramp tests were recently performed at CEA thanks to the "EDGAR" facilities on 50 cm long M5 clad segments with 12-15 $\mu$m thick Cr-coating. Heating rates ranging from 0.1 up to 25°C/s and internal pressures from 10 to 100 bars have been applied up to the rupture temperature. It was observed that, compared to the uncoated reference material, failure of the Cr-coated cladding segments occurred at comparable or higher temperatures with significantly smaller balloon and/or rupture opening. Very limited oxidation and excellent adhesion of the Cr-coating were also confirmed, even at the balloon location where the cladding was highly deformed. M5 is a trademark or a registered trademark of Framatome or its affiliates in the USA or other countries.
Keywords : LOCA
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Submitted on : Tuesday, February 25, 2020 - 12:00:42 PM
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  • HAL Id : cea-02328967, version 1

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M. Dumerval, Q. Houmaire, J.-C. Brachet, H. Palancher, J. Bischoff, et al.. Behavior of chromium coated M5 claddings upon thermal ramp tests under internal pressure (loss-of-coolant accident conditions). Topfuel 2018 - Light Water Reactor (LWR) Fuel Performance Meeting 2018, Sep 2018, Prague, Czech Republic. ⟨cea-02328967⟩

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