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The development of an optimal dismantling and handling procedure initially required a clearly formulated overall approach to decommissioning, with low overall dose uptake, acceptable waste generation and low aerosol production. Subsequently, all the components of the system were dimensioned and adjusted to one another to ensure problem free interaction. A number of clean cutting techniques were examined: those with indefinite edge geometry (cable saws, abrasive cutting), with alternating reaction force (piercing saws) with short reaction force flux (nibblers), as well as electrical discharge machining (EDM) and the YAG laser. The YAG laser is particularly suited to underwater use. It has a flexible tool head and generates only small quanitities of swarf, and the expensive laser light source can be positioned outside the control area. Abrasive cutting and nibbling were the most effective technologies. The presence of a flexible auxiliary instrument, such as an electric master-slave manipulator (EMSM) is necessary to ensure high performance in all areas of decommissioning technology. The special underwater abrasion technology for dismantling internal reactor fittings (upper grid plate) was developed to TÜV safety standards.

Additional information

Authors: KALWA H, Versuchsatomkraftwerk Kahl GmbH (DE);ARNOLD H U, DETEC GmbH, Alzenau (DE)
Bibliographic Reference: EUR 16608 DE (1995) 38 pp., FS ECU 7
ISBN: ISBN 92-827-5083-3
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