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Since 1988 ANDRA has been involved in the HAW project, a test disposal of high level radioactive canisters in a salt dome at Asse in Germany. ANDRA is responsible for in situ measurements, laboratory analyses and predictive calculations. With regard to in situ dose measurements, two methods have been developed: one is based on thermoluminescent dosemeters and measures an integrated dose, the other uses ionisation chambers and gives a dose rate. Other in situ measurements are concerned with geomechanics, especially rock-salt deformation induced by the heat produced by the canisters. For this purpose three groups of tiltmeters were installed, providing information on the natural creeping of rock-salt and the effect of electrical heating in two boreholes (A1 and B1). Laboratory studies involve the analysis of gases released by Asse salt samples irradiated under various conditions. After the necessary design and adjustment of operating procedures, the experiment was carried out satisfactorily. Most of the 150 sample irradiations were completed. The last area of ANDRA's participation in the project involves the prediction of gamma ray flux and spectrum in the HAW test field using computer models. The work carried out and discussed in this report includes digitalisation of test data, bremsstrahlung sensitivity analysis, and calculation of both energy deposited and dose rate around the sources.

Additional information

Authors: PALUT J M, CEA/ANDRA, Fontenay-aux-Roses (FR)
Bibliographic Reference: EUR 13264 FR (1991) 151 pp., FS, ECU 13.75
Availability: (2)
ISBN: ISBN 92-826-0513-2
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