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The Fracture and Aerosol Release of Impacted HLW Glasses and HLW Canisters

Published online by Cambridge University Press:  26 February 2011

Hans G. Scheibel ,
V. Friehmelt  and
H. Froehlich
Hans G. Scheibel
Affiliation:
Battelle-Institut e.V., Am Roemerhof 35, D-6000 Frankfurt, Federal Republic of, Germany
V. Friehmelt
Affiliation:
Battelle-Institut e.V., Am Roemerhof 35, D-6000 Frankfurt, Federal Republic of, Germany
H. Froehlich
Affiliation:
Battelle-Institut e.V., Am Roemerhof 35, D-6000 Frankfurt, Federal Republic of, Germany
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Abstract

The fracture and release mechanism of radioactive aerosols of HLW glass and HLW canisters are studied experimentally by laboratory scale and full scale drop tests. The experimental conditions model the conditions of accidental drops in a deep salt repository. The laboratory scale drop tests have a scaling factor of 1:10. Accelerated probes of simulated HLW glass impact on a ground plate and the size distributions of broken fines and released aerosols are measured by sieving and scanning electron microscopy (SEM) of aerosol samples.

The impact velocity is determined as the dominating impact parameter. Further parameters tested, such as waste glass composition, cooling time (residual thermal stresses), probe temperature at impact, and ground characteristics, show no measurable influence. Source terms of released respirable aerosols are evaluated for two reference cases, borehole drop (impact velocity v = 80 m/s) and reloading hall drop (v = 14 m/s), the values being 0.1 % and to 2.10-4 % respectively of the glass probe mass. The full scale drop tests are performed with European Standard HLW canisters. The canisters keep their integrity in all tests up to drop heights of 14 m. On opening the canisters, the broken fines are analyzed by sieving. The results are in good agreement with the small scale tests and confirm their acceptability for use in a safety analysis.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 127: Symposium BERLIN – Scientific Basis for Nuclear Waste Management XII , 1988 , 181
Copyright
Copyright © Materials Research Society 1989

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References

REFERENCES

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