Experimentelle und analytische Untersuchungen der Effektivität des Gebäudekondensators im SWR 1000
Experimentelle und analytische Untersuchungen der Effektivität des Gebäudekondensators im SWR 1000
To increase the safety as well as the economy of the innovative boiling water reactor SWR 1000 which is actually designed by Siemens AG, active safety systems are replaced, to the greatest possible extent, by passive safety systems or are combined together. One of these passive safety systems is the...
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Personal Name(s): | Fethke, M. (Corresponding author) |
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Contributing Institute: |
Publikationen vor 2000; PRE-2000; Retrocat |
Imprint: |
Jülich
Forschungszentrum Jülich, Zentralbibliothek, Verlag
1998
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Physical Description: |
getr. Pag. |
Document Type: |
Report Book |
Research Program: |
Addenda |
Series Title: |
Berichte des Forschungszentrums Jülich
3617 |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
To increase the safety as well as the economy of the innovative boiling water reactor SWR 1000 which is actually designed by Siemens AG, active safety systems are replaced, to the greatest possible extent, by passive safety systems or are combined together. One of these passive safety systems is the socalled building condenser which is foreseen as the passive decay heat removal from the containment of this reactor. Within the frame of this work, the thermalhydraulic behaviour of the building condenser was investigated experimentally and analytically under the boundary conditions during accidents using conservative assumptions. A total of 81 steady-state experiments were performed in the NOKO test facility at the Institute for Safety Research and Reactor Technology (ISR) at the Forschungszentrum Jülich GmbH. NOKO was especially constructed for the investigation of the effectiveness of passive safety systems. In the tests, the heat transfer at the finned tubes of the building condenser due to condensation of steam was investigated. The influence of the non-condensable gases oxygen and helium and their concentration was examined for two different designs of the condenser (with/without trough and with/without fall pipe). An empirical correlation was developed using the experimental data to be able to calculate the capacity of the condenser bundle as a function of the total pressure and the mass or volumetric fraction of the non-condensable gases oxygen and helium in the gas mixture which flows to the condenser.The computer code RALOC was used for the post-test calculations. RALOC has been developed by the Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) mbH. Three new heat transfer modeln were implemented in the code within this work which allow the calculation of the heat transfer especially at the finned tubes during the condensation of steam without and in the presence of non-condensable gas as well as the heat transfer from the structure (pipe wall) to the water inside the pipe due to forced convection. The modifications of the RALOC code were validated by 75 post-test calculations of the building condenser experiments in NOKO. A comparison between experimental and analytical results shows a good agreement. The new heat transfer models were shown to be very robust and to have no influence on the stability of the calculations. The improved RALOC code was used for the investigation of the effectiveness of the building condenser as a passive decay heat removal system. Therefore, two different accident scenarios ("2F-Break in one stream supply line" and "Small break in one steam supply line") in a boiling water reactor, which is orientated at the SWR 1000 design, were simulated. The RALOC calculations have shown the expected influence of the building condenser as an efficient passive decay heat removal system. Even after core melting, the decay heat is removed by the building condenser, thus limiting the pressure increase in the containment at a safe level. |