Suchergebnisse

Die Einführung des urbanen Gebietes in § 6a BauNVO [1] dient der Optimierung der Innenentwicklung, um die Inanspruchnahme von Flächen "auf der grünen Wiese" zu reduzieren [2-3]. Sie soll insbesondere den Kommunen die Planung von funktionsgemischten Gebieten in innerstädtischen Lagen erleichtern [3-4]. Die Kommunen können so – zum Zwecke der verstärkten Nutzungsmischung und um mehr Wohnraum zu schaffen – Wohnen und Gewerbe enger zusammenbringen. Um diese Ziele zu erreichen, wurden die zulässigen Immissionsrichtwerte der TA Lärm [5] für urbane Gebiete auf 63 dB(A) im Beurteilungszeitraum Tag (6-22 Uhr) und auf 45 dB(A) im Beurteilungszeitraum Nacht (22-6 Uhr) festgesetzt. Damit liegt der Immissionsrichtwert tagsüber 3 dB über dem der Mischgebiete; nachts ist der zulässige Immissionsrichtwert identisch. Diese Erhöhung wird vom Gesetzgeber begründet mit einem Duldungswillen bzw. Akzeptanz der Bevölkerung vor dem Hintergrund der damit verbundenen Vorteile: der "Stadt der kurzen Wege". Das Forschungsvorhaben konzentriert sich auf die Untersuchung der Geräuschimmissionen in innerstädtisch verdichteten Gebieten und geht der Frage nach, wie sich die Lärmsituation dort auf die Bevölkerung auswirkt. Damit betritt das Vorhaben Neuland; vergleichbare Untersuchungen liegen nach Kenntnis der Autorinnen und Autoren dazu bislang nicht vor. Die hier ermittelten und dargestellten Expositionswirkungskurven konzentrieren sich auf die Auswirkungen von "urbanem Gewerbelärm". Davon umfasst sind die Gewerbelärmquellen, die typischerweise in innerstädtischem Gebiet vorzufinden sind, das heißt Gastronomie, Einzelhandel und kleinere Gewerbebetriebe oder auch Tankstellen.

International audience ; In case of a severe accident in a light water nuclear reactor, hydrogen would be produced duringreactor core degradation and released into the reactor building. The stratification of the released hydrogen in the reactor containment could lead to local pockets of gas mixtures of high hydrogen concentration and, in case ofcombustion, to high pressure loads which might challenge the containment structural integrity.The objectives of ERCOSAM and SAMARA projects, co-funded by the European Union and the Russia, are to investigate hydrogen concentration build-up and break-up due to safety components operations, as sprays, coolers and Passive Auto-catalytic Recombiners (PARs).For this purpose, various experiments addressing accident scenarios scaled down from existing plant calculations to different thermal-hydraulics facilities (TOSQAN, MISTRA, PANDA, SPOT) are considered. This paper describes the work performed in framework of the workpackage WP1 of the ERCOSAM project and presents theadopted methodology to scale down the real plant calculations results, provided by the projects partners, to the experimental facilities.

International audience ; In case of a severe accident in a light water nuclear reactor, hydrogen would be produced duringreactor core degradation and released into the reactor building. The stratification of the released hydrogen in the reactor containment could lead to local pockets of gas mixtures of high hydrogen concentration and, in case ofcombustion, to high pressure loads which might challenge the containment structural integrity.The objectives of ERCOSAM and SAMARA projects, co-funded by the European Union and the Russia, are to investigate hydrogen concentration build-up and break-up due to safety components operations, as sprays, coolers and Passive Auto-catalytic Recombiners (PARs).For this purpose, various experiments addressing accident scenarios scaled down from existing plant calculations to different thermal-hydraulics facilities (TOSQAN, MISTRA, PANDA, SPOT) are considered. This paper describes the work performed in framework of the workpackage WP1 of the ERCOSAM project and presents theadopted methodology to scale down the real plant calculations results, provided by the projects partners, to the experimental facilities.

International audience ; In case of a severe accident in a light water nuclear reactor, hydrogen would be produced duringreactor core degradation and released into the reactor building. The stratification of the released hydrogen in the reactor containment could lead to local pockets of gas mixtures of high hydrogen concentration and, in case ofcombustion, to high pressure loads which might challenge the containment structural integrity.The objectives of ERCOSAM and SAMARA projects, co-funded by the European Union and the Russia, are to investigate hydrogen concentration build-up and break-up due to safety components operations, as sprays, coolers and Passive Auto-catalytic Recombiners (PARs).For this purpose, various experiments addressing accident scenarios scaled down from existing plant calculations to different thermal-hydraulics facilities (TOSQAN, MISTRA, PANDA, SPOT) are considered. This paper describes the work performed in framework of the workpackage WP1 of the ERCOSAM project and presents theadopted methodology to scale down the real plant calculations results, provided by the projects partners, to the experimental facilities.