Assessment of data and criteria for cladding burst in loss-of-coolant accidents

Vi soker i rapporten systematisera data avseende zirkoniumbaserade branslekapslingsrors brottbeteende under haverifall med kylmedelsforlust (LOCA), som rapporterats fran ex- perimentella studier sedan slutet av 1970-talet. Vart mal ar att faststalla anvandbara data och utvardera dessa gentemot de brottkriterier som ar tillgangliga i QT/SSM:s version av berakningsprogrammet FRAPTRAN. Detta program beraknar transientbeteendet hos karn- branslestavar i lattvattenreaktorer under reaktortransienter och hypotetiska olyckor, sasom LOCA. Databasen omfattar kapslingsmaterialen Zircaloy-4, ZIRLO och legeringar med sammansattningen Zr-1wt%Nb. Rapporten sammanfattar databasen, berakningsmetodiken och uttrycken for de olika brottkriterierna, samt presenterar resultaten av var utvardering genom att jamfora berakningsresultat med matdata i diagram over tid till kapslingsbrott, brottemperatur, och kapslingens brottspanning och brottojning. Dessutom ges en kort over- sikt av osakerheterna i berakningarna. Vi har funnit att Rosingers spanningsbaserade brottkriterium, vilket ursprungligen utvecklades for “best-estimate”-prediktering av kapslings- brott i Zircaloy-4, ar tillampbart for saval Zircaloy-4 som ZIRLO-kapsling, om en basta skattning av kapslingsbrott erfordras. Vad galler ZIRLO-kapsling, kan namnda brottkriterium forbattras ytterligare, under forutsattning att en tillracklig mangd matdata avseende brott- och materialegenskaper ar tillganglig.

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