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Distribution of hydrogen within the HDR-containment under severe accident conditions. OECD standard problem. Final comparison report

Abstract

The present report summarizes the results of the International Standard Problem Exercise ISP-29, based on the HDR Hydrogen Distribution Experiment E11.2. Post-test analyses are compared to experimentally measured parameters, well-known to the analysis. This report has been prepared by the Institute for Reactor Dynamics and Reactor Safety of the Technical University Munich under contract with the Gesellschaft fuer Anlagen- und Reaktorsicherheit (GRS) which received funding for this activity from the German Ministry for Research and Technology (BMFT) under the research contract RS 792. The HDR experiment E11.2 has been performed by the Kernforschungszentrum Karlsruhe (KfK) in the frame of the project 'Projekt HDR-Sicherheitsprogramm' sponsored by the BMFT. Ten institutions from eight countries participated in the post-test analysis exercise which was focussing on the long-lasting gas distribution processes expected inside a PWR containment under severe accident conditions. The gas release experiment was coupled to a long-lasting steam release into the containment typical for an unmitigated small break loss-of-coolant accident. In lieu of pure hydrogen a gas mixture consisting of 15% hydrogen and 85% helium has been applied in order to avoid reaching flammability during the experiment. Of central importance are common overlay plots comparing calculated transients with measurements of the global  More>>
Authors:
Publication Date:
Aug 15, 1992
Product Type:
Technical Report
Report Number:
INIS-XA-N-235; OECD-CSNI-ISP-29
Resource Relation:
Other Information: Refs, figs, tabs
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; COMPARATIVE EVALUATIONS; CONTAINMENT; FLAMMABILITY; FORSCHUNGSZENTRUM KARLSRUHE; GESELLSCHAFT FUER ANLAGEN- UND REAKTORSICHERHEIT; HELIUM; HYDROGEN; PWR TYPE REACTORS; REACTOR ACCIDENTS; REACTOR COOLING SYSTEMS; REACTOR KINETICS; REACTOR SAFETY; SIMULATION; STANDARDS
OSTI ID:
20729616
Research Organizations:
Lehrstuhl fuer Reaktordynamik und Reaktorsicherheit, Technische Universitaet Muenchen (Germany)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: Contract 73010/UA 670; TRN: XA04N2808040884
Availability:
Available from INIS in electronic form
Submitting Site:
INIS
Size:
245 pages
Announcement Date:
May 24, 2006

Citation Formats

Karwat, H. Distribution of hydrogen within the HDR-containment under severe accident conditions. OECD standard problem. Final comparison report. IAEA: N. p., 1992. Web.
Karwat, H. Distribution of hydrogen within the HDR-containment under severe accident conditions. OECD standard problem. Final comparison report. IAEA.
Karwat, H. 1992. "Distribution of hydrogen within the HDR-containment under severe accident conditions. OECD standard problem. Final comparison report." IAEA.
@misc{etde_20729616,
title = {Distribution of hydrogen within the HDR-containment under severe accident conditions. OECD standard problem. Final comparison report}
author = {Karwat, H}
abstractNote = {The present report summarizes the results of the International Standard Problem Exercise ISP-29, based on the HDR Hydrogen Distribution Experiment E11.2. Post-test analyses are compared to experimentally measured parameters, well-known to the analysis. This report has been prepared by the Institute for Reactor Dynamics and Reactor Safety of the Technical University Munich under contract with the Gesellschaft fuer Anlagen- und Reaktorsicherheit (GRS) which received funding for this activity from the German Ministry for Research and Technology (BMFT) under the research contract RS 792. The HDR experiment E11.2 has been performed by the Kernforschungszentrum Karlsruhe (KfK) in the frame of the project 'Projekt HDR-Sicherheitsprogramm' sponsored by the BMFT. Ten institutions from eight countries participated in the post-test analysis exercise which was focussing on the long-lasting gas distribution processes expected inside a PWR containment under severe accident conditions. The gas release experiment was coupled to a long-lasting steam release into the containment typical for an unmitigated small break loss-of-coolant accident. In lieu of pure hydrogen a gas mixture consisting of 15% hydrogen and 85% helium has been applied in order to avoid reaching flammability during the experiment. Of central importance are common overlay plots comparing calculated transients with measurements of the global pressure, the local temperature-, steam- and gas concentration distributions throughout the entire HDR containment. The comparisons indicate relatively large margins between most calculations and the experiment. Having in mind that this exercise was specified as an 'open post-test' analysis of well-known measured data the reasons for discrepancies between measurements and simulations were extensively discussed during a final workshop. It was concluded that analytical shortcomings as well as some uncertainties of experimental boundary conditions may be responsible for deviations. Several processes have been identified to deserve more close consideration. The long-lasting absorption of energy by relatively cold containment structures and the associated prediction of long acting heat-sources and - sinks as well as the predictability of the temperature of the sump water collected during the experiment and the impact of an instrument cooling system extracting relatively large amounts of energy during the experiment were the main objects of the discussion. Several important recommendations concerning future activities have been identified. (author)}
place = {IAEA}
year = {1992}
month = {Aug}
}