Leipzig L-IV experiment accident

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The Leipzig L-IV experiment accident was the first nuclear accident in history. It occurred on 23 June 1942 in a laboratory at the Physical Institute of the Leipzig University in Leipzig, Germany. There was a steam explosion and a reactor fire in the "uranium machine", a primitive form of research reactor. [1]

Contents

Shortly after the Leipzig L-IV atomic pile—worked on by Werner Heisenberg and Robert Döpel—demonstrated Germany's first signs of neutron propagation, the device was checked for a possible heavy water leak. During the inspection, air leaked in, igniting the uranium powder inside. The burning uranium boiled the water jacket, generating enough steam pressure to blow the reactor apart. Burning uranium powder scattered throughout the lab causing a larger fire at the facility. [2] [3]

This happened after 20 days of operation when Werner Paschen opened the machine at the request of Döpel after blisters formed at the gasket. [1] As glowing uranium powder shot to the 6 meter high ceiling and the apparatus heated up to 1000 degrees, Heisenberg was asked for help but could not provide it. [1]

The experiment

Results from the L-IV trial, in the first half of 1942, indicated that the spherical geometry, with five tonnes of heavy water and 10 tonnes of metallic uranium, could sustain a fission reaction. They had achieved the first net neutron production of the German program, three years after the first such pile in history by Hans von Halban and colleagues in Paris. [4] The results were set forth in an article by Robert Döpel, Klara Döpel and W. Heisenberg. [5] The article was published at first in the Kernphysikalische Forschungsberichte (Research Reports in Nuclear Physics), a classified internal reporting vehicle of the Uranverein. [6]

The Leipzig research group was led by Heisenberg until 1942 who in winter 1939/1940 reported on the possibilities and feasibility of energy extraction from uranium for a uranium reactor and nuclear bomb. After the report Heisenberg withdrew from practical experiments and left the execution of the experiments L-I, L-II, L-III and L-IV mostly up to his coworkers. [7] The accident ended the Leipzig uranium projects. [8]

See also

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References

  1. 1 2 3 Kretz, Sebastian (19 April 2012). "Geschichte der Atomkraft: Der Urknall". Die Zeit. Retrieved 11 February 2017.
  2. ↑ R. Döpel (1941 bzw. 1942), Beschreibung zweier Unfälle mit Uranoxid.
  3. ↑ Goudsmit, S. A. (November 1947). "Heisenberg on the German Uranium Project". Bulletin of the Atomic Scientists. 3 (1): 343ff. Bibcode:1947BuAtS...3k.343G. doi:10.1080/00963402.1947.11459137. ISSN   0096-3402 . Retrieved 2014-06-26.
  4. ↑ Reed, B. Cameron (2021). "An inter-country comparison of nuclear pile development during World War II". The European Physical Journal H. 46 (1). doi: 10.1140/epjh/s13129-021-00020-x . ISSN   2102-6459.
  5. ↑ R. Döpel, K. Döpel and W. Heisenberg: Der experimentelle Nachweis der effektiven Neutronenvermehrung in einem Kugel-Schichten-System aus D2O und Uran-Metall. In: Werner Heisenberg: Collected Works Bd. A II (Eds. W. Blum et al., Springer-Verl., Berlin 1989, S. 536-544. Online: Research report 1942.
  6. ↑ G-136 (July 1942), as cited in Walker, 1993, 272.
  7. ↑ "Deutsches Museum: Forschungszentrum Leipzig". www.deutsches-museum.de (in German). Deutsches Museum. Retrieved 11 February 2017.
  8. ↑ "Zu einem autobiographischen Brief von Robert Döpel an Fritz Straßmann" (PDF). Retrieved 11 February 2017.
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