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Effective water cooling of very hot surfaces during the LOCA accident.
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SYSNO ASEP 0481374 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Effective water cooling of very hot surfaces during the LOCA accident. Author(s) Štepánek, J. (CZ)
Bláha, V. (CZ)
Dostál, V. (CZ)
Entler, Slavomír (UFP-V) ORCIDSource Title Fusion Engineering and Design. - : Elsevier - ISSN 0920-3796
Roč. 124, November (2017), s. 1211-1214Number of pages 4 s. Publication form Print - P Action SOFT 2016: Symposium on Fusion Technology /29./ Event date 05.09.2016 - 09.09.2016 VEvent location Prague Country CZ - Czech Republic Event type WRD Language eng - English Country CH - Switzerland Keywords LOCA ; Quenching ; Divertor cooling ; Heat transfer ; Rewetting Subject RIV JF - Nuclear Energetics OECD category Nuclear related engineering Institutional support UFP-V - RVO:61389021 UT WOS 000419411900252 EID SCOPUS 85016419521 DOI 10.1016/j.fusengdes.2017.03.150 Annotation The quench front propagation in the case of the water emergency cooling of water cooled fusion nuclear components is studied during the LOCA accident. In the case of the LOCA accident, heat removal can be successful only when water rewetts the surface. The place where water meets the very hot surface is called the quench front. The quench front propagation depends on the initial wall temperature, coolant flow rate, and heat accumulated in the cooled components. Results of the quench front experiment in an annular 1.7 m length channel with initial wall temperatures within the range from 250 degrees C up to 800 degrees C and coolant mass fluxes 100 kg/m(2) s and 180 kg/m(2) s are presented. From the results is concluded, that quenching velocities and rewetting temperatures are strongly dependent on the initial wall temperature as well as the pressure spikes. The behaviour of the heat transfer coefficient at the quench front is analyzed.
Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2018
Number of the records: 1