THE DEVELOPMENT OF ECONOMICAL DECONTAMINATION METHODS
The activity inventory of the Nuclear Power Plant Gundremmingen (BWR, 250 MW-el) had been investigated. In the turbine hall, reactor annulus and auxiliary building two years after shut down a remaining activity of 3,5 E10 Bq was found. The main nuclide was cobalt 60 which is accounting for more than 70% of the total activity. The different decontamination methods were proved by laboratory tests on originally contaminated pipe samples. With respect to - high efficiency, - minimizing secondary waste and - easy handling the electrochemical decontamination proved to be the most economical decontamination method. This decontamination procedure had been tested on primary steam valves and the feedwater pumps. 10-20 manhours were needed for the decontamination of each ton of material. The specific secondary waste amount was 95 kg per ton of steel. Those figures were evaluated for the dismantling of a 250 MW-el Boiling Water Reactor (except of the containment). After the decontamination of 3400 tons of metal about 260 tons of secondary waste will remain. The dismantling will need 5-9 years. The same evaluation has been performed too for a 1300 MW-el Boiling Water Reactor.
Bibliographic Reference: EUR 10519 DE (1986) MF, 146 P., BFR 300, BLOW-UP BFR 750, EUROFFICE, LUXEMBOURG, POB 1003
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Record Number: 1989125006800 / Last updated on: 1987-01-01
Available languages: de