On local blockage formation in sodium cooled reactors

Schultheiss, G.F.

doi:10.1016/0029-5493(87)90090-2

Cited by 17 publications

(4 citation statements)

References 3 publications

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“…Pre-test CFD analysis shows the same basic phenomena of previous studies on larger bundles (Di Piazza, 2014) and documented in literature (Schultheiss, 1987) (Kirsch, 1975). A strong local effect is evident behind the blockage area leading to an elongated vortex with a decrease of heat transfer between the coolant and the cladding.…”

Section: Discussionsupporting

confidence: 79%

“…Blockage can be instantaneous (when a large enough piece of material obstructs a portion of the channels of the FA) or time dependent (when the aggregation of solid matter piles up in the channels of the FA). For grid-spaced FAs, an internal blockage is generally located in the first grid and it has a flat-like shape (Schultheiss, 1987). FAs are usually designed with a number of inlets slots to prevent a complete and instantaneous blockage.…”

Section: Introductionmentioning

confidence: 99%

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Pre-test CFD simulations of the NACIE-UP BFPS test section

Marinari

Piazza

Forgione

et al. 2017

Annals of Nuclear Energy

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The present paper is focused on the CFD pre-test analysis and design of the new experimental facility Blocked Fuel Pin bundle Simulator (BFPS) that will be installed into the NACIE-UP (NAtural CIrculation Experiment-UPgrade) facility located at the ENEA Brasimone Research Center (Italy). The BFPS test section will carry out suitable experiments to fully investigate different flow blockage regimes in a 19 fuel pin bundle providing experimental data in support of the development of the ALFRED (Advanced Lead-cooled Fast Reactor European Demonstrator) LFR DEMO. The geometrical domain of the fuel pin bundle simulator was designed to reproduce the geometrical features of ALFRED, e.g. the external wrapper in the active region and the spacer grids. Pre-tests calculations were carried out by applying accurate boundary conditions; the conjugate heat transfer in the clad is also considered. The blockages investigated are internal blockages of different extensions and in different locations: central sub-channel blockage, corner sub-channel blockage, edge sub-channel blockage, one sector blockage, and two-sector blockage. RANS simulations were carried out adopting the ANSYS CFX commercial code with the laminar sublayer resolved by the mesh resolution. The loci of the peak temperatures and their width as predicted by the CFD simulations are used for determining the location of the pin bundle instrumentation. The CFD pre-test analysis allowed also investigating the temperature distribution in the clad to operate the test section safely

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Section: Discussionsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Pre-test CFD simulations of the NACIE-UP BFPS test section

Marinari

Piazza

Forgione

et al. 2017

Annals of Nuclear Energy

View full text Add to dashboard Cite

show abstract

“…Therefore, in this case, the preferential shape of the blockage is elongated and it follows the helicoid wire (Schultheiss, 1987).…”

Section: Introductionmentioning

confidence: 97%

“…A horizontal plate like particle bed with strong radial growth tendency was found (Schultheiss, 1987). In this paper the attention is focused on the grid-spaced bundles.…”

Section: Introductionmentioning

confidence: 98%