Lost concrete shield
Reinforced, cylindrical concrete containers are referred to as lost concrete shields (VBA), which are used to shield the barrels with radioactive waste placed in them from radiation . VBA are final storage containers and are referred to in the final storage conditions for the Konrad repository as concrete container type I or concrete container type II. Type I and Type II differ in their dimensions, as they are designed to hold waste drums of different sizes. VBA type I are used to hold 200 l waste drums, VBA type II to hold 400 l waste drums. VBA were developed and manufactured from 1973 in the course of the storage of radioactive waste in the ASSE II, initially to hold 200 l waste drums.
Origin of name
For the final storage of radioactive waste, the waste barrels are inseparably connected to the concrete shielding by pouring concrete , whereby the shielding together with the waste barrel reaches the repository as a so-called waste container and is therefore considered "lost".
Types of concrete
VBA can be made from three different types of concrete. There are VBA made of normal concrete (NBA), heavy concrete (SBA) and granulated concrete (GBA). These types of concrete differ in their composition and thus in their density and shielding effect. The heavy concrete used contains barite or hematite as an aggregate, and the granulated concrete contains iron granules made from low-level radioactive scrap metal.
Outwardly, the NBA, SBA and GBA differ in the paint: NBA are painted gray, SBA red-brown and GBA light blue. Images of the NBA and SBA can be found in and about the GBA in.
| Type of concrete | Density (kg / m³) |
|---|---|
| Normal concrete | 2200-2400 |
| Heavy concrete | 3400 |
| Granulated concrete | 3400 |
VBA in ASSE II
In the period between 1973 and the closure on December 31, 1978, a total of 14,779 VBA were placed in eight emplacement chambers of ASSE II.
Individual evidence
- ↑ Karin Kugel, Kai Möller: Requirements for radioactive waste to be disposed of (disposal conditions, status: February 2017). In: http://www.endlager-konrad.de/Konrad/DE/mediathek/fachunterlagen/fachunterlagen_node.html;jsessionid=A70FF82B271A76E641EEADFA3432D549.2_cid349 . Federal Office for Radiation Protection, February 10, 2017, accessed on May 19, 2018 (German).
- ↑ Kernfragen.de. Retrieved May 19, 2018 .
- ↑ Karin Kugel: Which radioactive waste should be stored in Konrad? In: Konrad repository. Federal Office for Radiation Protection, May 24, 2016, accessed on May 19, 2018 (German).
- ↑ Siempelkamp: Siempelkamp Bulletin May 20013. In: Siempelkamp. Siempelkamp, May 2015, accessed on May 19, 2018 (German).
- ↑ Compiled by the Helmholtz Zentrum München, German Research Center for Health and Environment, Jülich project group: AG Asse inventory - final report. In: https://www.atommuellreport.de/home.html . Helmholtz Zentrum München, PG Jülich, August 31, 2010, accessed on May 19, 2018 (German).