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Effects of additional gases resulting from residual water inside ILW packages

  • Packages for intermediate level waste (ILW) often contain residual water besides the actual waste. The water either exists as obvious free water or it may be bound physically or chemically, e.g. as pore water. A water driven gas generation could occur by vaporisation and by radiolysis. Steam as the result of vaporisation causes an increasing pressure inside a package and can affect corrosion. Vaporisation and condensation processes itself change the thermal behavior of the content especially during strongly unsteady thermal situations like accident fire situations. Radiolysis changes the chemical composition of the content which could cause an unexpected interaction, e.g. hydrogen embrittlement. Besides the pressure build-up the radiolysis of water generates hydrogen and oxygen, which can be highly flammable respectively explosive. The gas generation caused by vaporisation and radiolysis must be taken into account during the design and the safety assessment of a package. PressurePackages for intermediate level waste (ILW) often contain residual water besides the actual waste. The water either exists as obvious free water or it may be bound physically or chemically, e.g. as pore water. A water driven gas generation could occur by vaporisation and by radiolysis. Steam as the result of vaporisation causes an increasing pressure inside a package and can affect corrosion. Vaporisation and condensation processes itself change the thermal behavior of the content especially during strongly unsteady thermal situations like accident fire situations. Radiolysis changes the chemical composition of the content which could cause an unexpected interaction, e.g. hydrogen embrittlement. Besides the pressure build-up the radiolysis of water generates hydrogen and oxygen, which can be highly flammable respectively explosive. The gas generation caused by vaporisation and radiolysis must be taken into account during the design and the safety assessment of a package. Pressure build-up, a changed thermal behavior and content chemistry, and especially the risk of accumulation of combustible gases exceeding the limiting concentration for flammability has to be considered in the safety assessment. Approaches to ensure the transportability of stored packages due to radiolysis will be discussed.zeige mehrzeige weniger

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Metadaten
Autor*innen:Marko Nehrig, Frank Wille, Annette Rolle, Konrad Linnemann
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Präsentation
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Proceedings-CD, ASME 2016 Pressure Vessels & Piping Conference (PVP2016)
Jahr der Erstveröffentlichung:2016
Herausgeber (Institution):American society of mechanical engineers (ASME)
Jahrgang/Band:7
Erste Seite:Paper 63008, 1
Letzte Seite:6
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Angewandte Physik
Freie Schlagwörter:Gas generation; Pressure build-up; Radioactive material
Veranstaltung:ASME 2016 Pressure Vessels & Piping Conference (PVP2016)
Veranstaltungsort:Vancouver, BC, Canada
Beginndatum der Veranstaltung:17.07.2016
Enddatum der Veranstaltung:21.07.2016
ISBN:978-0-7918-5045-9
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:25.11.2016
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:07.04.2017
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