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An in-pile performance test of HANA claddings was conducted at up to 67 GWD/MTU in the Halden research reactor inNorway over a 6.5 year period. Four types of HANA claddings (HANA-3, HANA-4, HANA-5, and HANA-6) and a referenceZircaloy-4 cladding were used for the in-pile test. The evaluation parameters of the HANA claddings were the corrosionbehavior, dimensional changes, hydrogen uptake, and tensile strength after the claddings were tested under the simulatedoperation conditions of a Korean commercial reactor. The oxide thickness ranged from 15 to 37 mm at a high flux region inthe test rods, and all HANA claddings showed corrosion resistance superior to the Zircaloy-4 cladding. The creep-down rate ofall HANA claddings was lower than that of the Zircaloy-4 cladding. In addition, the hydrogen content of the HANA claddingsranged from 54 to 96 wppm at the high heat flux region of the test rods, whereas the hydrogen content of the Zircaloy-4cladding was 119 wppm. The tensile strength of the HANA and Zircaloy-4 claddings was similarly increased when comparedto the un-irradiated claddings owing to the radiation-induced hardening.

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