STAUB-III
Table of contents
STAUB-III - Examinations for the evaluation of safety relevant aspects of dust release from primary coolant circuit of gas cooled reactors
| Project Manager: | Prof. Dr.-Ing. habil Antonio Hurtado Prof. Dr.-Ing. habil. Wolfgang Lippmann |
| Contributors: | Dipl.-Ing. Felix Fischer Andreas Andris, M.Eng. Erik Findeisen |
| Duration: | 04/2016 - 02/2020 |
| Funding: | BMWi |
| Funding code: | 1501526 |
Brief Description
In a Pebble Bed High Temperature Reactor (HTR), the reactor core consists of a large number of spherical graphite fuel elements. The pebbles are loaded into the reactor core as a packed bed with a conical floor. In order to operate the reactor, the pebbles move through the core from the top of the reactor to the bottom level. This motion in the pebble bed causes unavoidable relative movements velocities between pebbles and the graphitic reflector as well as between pebbles among each other are unavoidable. This slow and continuous movement generates different types of graphite particle formation. Additionally, carbonaceous particles can be produced by chemical reactions. These particles are dispersed in the helium coolant and transported throughout the primary circuit. During severe accidents such as Depressurized Loss of Forced Coolant radioactive contaminated dust can be remobilised and released to the environment. In order to prevent radioactive contamination of the environment, retention systems such as filters need to be designed.
Consequently, this work is mainly aiming to generate experimental data as a base to develop or to adjust models of particle transport and deposition under conditions close to those in a HTR primary circuit. Separate effect studies are carried out focusing on deposition and resuspension of particles under stationary and transient flow conditions at the test facility DRESDEN-TUBE. Furthermore, the long-term interaction between particles and materials such as metallic alloys and ceramics used in HTR primary circuit are investigated at the test facility DRESDEN-TANK.
The dust behaviour investigations do not include the analysis of radioactive contaminated dust. To a greater degree the relevance of particle emission out of the primary circuit is the investigation aim. As a conservative assessment the radioactive inventory can be assumed as bound to the dust.
Test Facility DRESDEN-TUBE
Test Facility DRESDEN-TANK
