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30/01/15 The fourth ARCHER Newsletter was released on 30 January 2015. Read online here

21/01/15 The second ARCHER EUROCOURSE, hosted by NRG, was held in Petten from 19-20 January 2015. Click here for more info

26/11/14 The third ARCHER Newsletter was released on 26 November 2014. Read online here

28/10/14 The ARCHER final meeting was held on 21-22 Jan 2015 at NRG in Petten (NL).

27/10/14 The High Temperature Reactor (HTR) Conference was held from 27-31 October 2014 in Weihai, Shandong Province, China. Click here for more info

29/03/14 The second Newsletter was released on 28 March 2014. Read online here

Supported by

European Commission

Thomas Barth awarded for work performed within ARCHER

4 June 2013 Thomas Barth, PhD student at HZDR, was awarded with the "Best Presentation Oral Paper Award” at the 15th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-15) held on 12-17 May in Pisa, Italy, for his paper “Study of Particle Deposition and Resuspension in Pebble Beds Using Positron Emission Tomography”.

Three out of 439 contributions were awarded with a prize – one for best written paper, one for best discussion and one for best presentation.

The prized work was performed within ARCHER / SP2 / WP2.3 / Task 2.3.4 - Dust Deposition and Remobilisation in a Pebble Bed Experiment - and is related to source term chain analysis for (V)HTR pebble bed reactors.

In the experimental work graphite dust deposition and remobilisation in a pebble bed under turbulent gas flow was studied using sophisticated Positron Emission Tomography imaging. Graphite particles were radiolabelled with a positron emitter and the spatiotemporal distribution of the particles in the pebble bed was recorded for different flow conditions.

The results provided detailed insights into the complex transport processes of graphite particles in the pebble bed, such as detailed location of deposition places on the pebbles and discontinuous remobilisation during gas flow transients. The high detail of the data makes it most suitable for future CFD code development.