Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Evaluation of Ductility During Reactivity Initiated Accident for Zirconium Cladding using Ring Tension Test

링 인장시험을 이용한 지르코늄 피복관의 반응도 사고(RIA) 시 연성 평가

  • Kim Jun Hwan (Zirconium Fuel Cladding Development Team, Korea Atomic Energy Research Institute) ;
  • Lee Myoung Ho (Zirconium Fuel Cladding Development Team, Korea Atomic Energy Research Institute) ;
  • Choi Byoung Kwon (Zirconium Fuel Cladding Development Team, Korea Atomic Energy Research Institute) ;
  • Bang Je Geon (Zirconium Fuel Cladding Development Team, Korea Atomic Energy Research Institute) ;
  • Jeong Yong Hwan (Zirconium Fuel Cladding Development Team, Korea Atomic Energy Research Institute)
  • Published : 2005.02.01
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Abstract

Mechanical properties of zirconium cladding were evaluated by ring tension test to simulate Reactivity-Initiated Accident (RIA) at high burnup situation as an out-reactor test. Zircaloy-4 cladding was hydrided up to 1000 ppm as well as oxidized up to $100\;{\mu}m$ to simulate high-burnup situation. After simulated high-burnup treatment, ring tension test was carried out from 0.01 to 1/sec to correlate with actual RIA event. The results showed that ductility and circumferential toughness decreased with the hydrogen content and oxide thickness. Hydride generated inside cladding acted as brittle failure. Oxygen influenced cladding tube by the reduction of load bearing area, oxygen embrittlement, and thermal aging. Correlation between in-reactor RIA parameter like fuel enthalpy and out-reactor toughness was performed and showed a reasonable result.

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