The following contribution describes the main features of the demonstration of the control of loss of coolant accidents with release of insulation material under consideration of actions taken in German BWR. The general criteria for the assessment as well as comparable individual aspects are adopted from the RSK statement (374th meeting) for PWR from July 2004. After the Barsebäck event in 1992 administrative regulations were implemented for securing the plant cleanliness as well as modifications to strainers of the ECCS and the containment (e. g. the introduction of perforated plates in the control rod chamber). This contribution illustrates that sufficient examinations and tests have been performed for German BWR for a final positive evaluation that the amount of fibers which enter the core remain below the amount at which core cooling is no longer guaranteed. Currently, for one BWR an additional optimation of the ECCS systems (here the introduction of a socalled “sandwich” wire cloths in the ECCS strainers) has currently been applied for. Through this the core entry of insulation material – even for fibers with a covering small lengths spectrum – can be further reduced and currently existing safety margins further increased.
From A. Schaffrath | M. Henschel
Appeared in Kerntechnik 2011/01, Page 66-71
Direct link: http://www.nuclear-engineering-journal.com/KT110139
Nachweis der Beherrschung von Kühlmittelverluststörfällen mit Freisetzung von Isoliermaterial unter Berücksichtigung zwischenzeitlich durchgeführter Maßnahmen [420 KB]
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1 Pointner, W.; Kersting, E.; Pütter, B.: Generic Issues on Sump Clogging. EUROSAFE Brussels, November 7–8, 2005.
2 Maqua, M.:Das Barsebäck-Ereignis: Ablauf, Bedeutung und Folgen. KTG Fachtag “Aktuelle Themen der Reaktorsicherheitsforschung in Deutschland” Rossendorf, April 3–4, 2006.
3 U.S. Nuclear Regulatory Commission: Knowledge Base for the effect of debris on pressurized water reactor emergency core cooling sump performance. NUREG-CR-6808, February 2003.
4 German Reactor Safety Commission (RSK): Requirements for the demonstration of effective emergency core cooling during loss-of-coolant accidents involving the release of insulation material and other substances, RSK statement, 374th meeting, July 22, 2004, http://www.rskonline.de/537870988c07e060b/index.htm.
5 U.S. Nuclear Regulatory Commission: Containment emergency sump Performance, NUREG-0897, Rev. 1, 01.10.1985.
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