Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Air Ingress and Graphite Burning in HTRs: A Survey on Analytical Examinations Performed with the Code React/Thermix
An overview an results of analyses performed with help of the code REACT/THERMIX for severe air ingress including graphite burning in HTRs is given; results already published are shortly summarized here only and this report concentrates an still unpublished work. Analyses an air ingress in the pebble bed reactors PNP-500, THTR-300, HTR-Modul, AVR-11 and AVR process heat plant are outlined; in addition, some results for the VHTR with block type fuel are given. Air ingress requires primary circuit depressurization and large leak(s) to reactor buildings and environment and belongs therefore to highly hypothetical events in the sense of classical safety analysis. For that, significant uncertainties are present in the field of system analytical handling of these accidents for most cases; accordingly, important starting conditions of these accidents had to be taken as parameters in our safety analyses. This parameter based procedure allows also to obtain some Informationan accidents initiated by sabotage etc. not considered in actual safety analyses up to now. Before REACT/THERMIX-results are presented, some general remarks an air ingress and an the burning phenomenon in HTRs are made. One accident class examined is air ingress with forced flow by emergency cooling: For this case, therange of mass flow/air content in cooling gas has been evaluated, in which safe core cool down is possible resp. long term core burning occurs; for highest availableemergency cooling flow, a safe cool down of the THTR-300, which has no reactor building, is possible for up to 20 vol-% of air in the cooling gas, whereas low flowallows only for about 5 vol-%. If the amount of available air is restricted to the content of a reactor building, as is examined for the PNP-500, relevant consequences have not to be expected; this remains also true for forced convection flow, if burning of CO, formed by graphite oxidation, within the building is considered. For the second accident class examined, air ingress with natural convection flow by chimney ...
Air Ingress and Graphite Burning in HTRs: A Survey on Analytical Examinations Performed with the Code React/Thermix
An overview an results of analyses performed with help of the code REACT/THERMIX for severe air ingress including graphite burning in HTRs is given; results already published are shortly summarized here only and this report concentrates an still unpublished work. Analyses an air ingress in the pebble bed reactors PNP-500, THTR-300, HTR-Modul, AVR-11 and AVR process heat plant are outlined; in addition, some results for the VHTR with block type fuel are given. Air ingress requires primary circuit depressurization and large leak(s) to reactor buildings and environment and belongs therefore to highly hypothetical events in the sense of classical safety analysis. For that, significant uncertainties are present in the field of system analytical handling of these accidents for most cases; accordingly, important starting conditions of these accidents had to be taken as parameters in our safety analyses. This parameter based procedure allows also to obtain some Informationan accidents initiated by sabotage etc. not considered in actual safety analyses up to now. Before REACT/THERMIX-results are presented, some general remarks an air ingress and an the burning phenomenon in HTRs are made. One accident class examined is air ingress with forced flow by emergency cooling: For this case, therange of mass flow/air content in cooling gas has been evaluated, in which safe core cool down is possible resp. long term core burning occurs; for highest availableemergency cooling flow, a safe cool down of the THTR-300, which has no reactor building, is possible for up to 20 vol-% of air in the cooling gas, whereas low flowallows only for about 5 vol-%. If the amount of available air is restricted to the content of a reactor building, as is examined for the PNP-500, relevant consequences have not to be expected; this remains also true for forced convection flow, if burning of CO, formed by graphite oxidation, within the building is considered. For the second accident class examined, air ingress with natural convection flow by chimney ...
Air Ingress and Graphite Burning in HTRs: A Survey on Analytical Examinations Performed with the Code React/Thermix
Moormann, R. (Autor:in)
01.01.1995
Jülich : Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag, Berichte des Forschungszentrums Jülich 3062, II, 47 p. (1995).
Paper
Elektronische Ressource
Englisch
DDC:
690
Groundwater ingress to tunnels – The exact analytical solution
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Groundwater ingress to tunnels – The exact analytical solution
| British Library Online Contents | 2007