Change search
ReferencesLink to record
Permanent link

Direct link
Experiments and Characterization of the Two-Phase Flow Driven Particulate Debris Spreading in the Pool
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.ORCID iD: 0000-0002-2725-0558
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.ORCID iD: 0000-0002-9123-2944
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.ORCID iD: 0000-0002-0683-9136
2014 (English)In: NUTHOS-10 / [ed], Okinawa, Japan, 2014, 1257- p.Conference paper (Refereed)
Abstract [en]

Melt fragmentation, quenching and long term coolability in a deep pool of water under reactor vessel are employed as a severe accident mitigation strategy in several designs of light water reactors. Success of the strategy is contingent upon effectiveness of natural circulation in removing the decay heat generated by the porous debris bed. Geometrical configuration of the bed is one of the factors which affect coolability of the bed. Boiling and two-phase turbulent flows in the pool serve as a source of mechanical energy which can affect the initial geometry as well as dynamically change the shape of already formed debris bed. The main goal of this work is to provide experimental data on spreading of solid particles in the pool by large scale two-phase flow structures induced by gas injection from the bottom. These data are necessary for development and validation of predictive capabilities of computer codes allowing numerical modeling of the debris bed formation at prototypic severe accident conditions.  Results of a new series of PDS-P (Particulate Debris Spreading in the Pool) tests reported in this paper are for two types of tests: (i) the pure two-phase flows without particles and (ii) tests with particles. In both tests series, vapor flows in saturated water are simulated by air injection at the bottom of the facility. Experimental conditions such as gas-phase flow rate and particle properties (density, size etc.) are scaled to maintain relevancy to the prototypic accident conditions. The water pool is constructed as a rectangular tank. It has close to 2D geometry with fixed width (72 mm), variable length (up to 1.6 m) and allows water filling depth of up to 1 m. The variable pool length and depth allows formation of the different in size and pattern two-phase circulating flows. The average void fraction in the pool is determined by video recording and image processing. Particles are supplied from the top of the facility above the water surface. In the separate-effect studies of the influence of two-phase currents on particle trajectories and bed formation, low particle flow rate is required in order to minimize or completely exclude particle-particle interaction.

Place, publisher, year, edition, pages
Okinawa, Japan, 2014. 1257- p.
Keyword [en]
Particulate spreading, debris, two-phase flow, turbulence, coolability, Partikel spridning, hög, tvåfasflöde, turbulens, kylbarhet
National Category
Other Physics Topics
Research subject
Energy Technology; Physics
URN: urn:nbn:se:kth:diva-165102OAI: diva2:807365
10th International Topical Meeting on Nuclear Thermal Hydraulics, Operation and Safety (NUTHOS-10)Dec. 14-18, 2014 Okinawa, Japan

QC 20150424

Available from: 2015-04-23 Created: 2015-04-23 Last updated: 2015-04-24Bibliographically approved

Open Access in DiVA

fulltext(2296 kB)43 downloads
File information
File name FULLTEXT01.pdfFile size 2296 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Other links

Conference website

Search in DiVA

By author/editor
Konovalenko, AlexanderBasso, SimoneKudinov, Pavel
By organisation
Nuclear Power Safety
Other Physics Topics

Search outside of DiVA

GoogleGoogle Scholar
Total: 43 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 68 hits
ReferencesLink to record
Permanent link

Direct link