AbstractAbstract
[en] There are various methods available for the on-site decontamination of removable equipment in Switzerland: a shot peening glass beads method, using a mixture of demineralized water and glass beads within a closed box; high pressure water jet method; wet cleaning methods, using washing basins of different dimensions, detergent and brushes. The manuel cleaning is limited to a few cases, where the special form or the dimensions of the equipment do not allow the application of the glass bead method. Examples of the first two methods are discussed here. These methods have been in use at the nuclear power plant Muehleberg, which is a General Electric Mk I boiling water reactor of 306MWe (net) power and which has been in commercial operation since October 1972
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Source
International Atomic Energy Agency, Vienna (Austria); 93 p; Jun 1981; p. 71-75; Technical committee meeting on the procedures for decontamination of operating nuclear power plants and handling of decontamination wastes; Mol, Belgium; 23 - 27 Apr 1979
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Report
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Conference
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AbstractAbstract
[en] In June 1978, there occurred in the port of Ijmuiden, Netherlands, a contamination incident involving drums originating from Switzerkand and containing radioactive wastes intended to be dumped into the sea. The batch of 207 drums excluded from the sea-dumping action had to be sanitated for the next year dumping in such a manner, that these wastes met the international requirements and could be disposed of by sinking them into the Atlantic. As a consequence of extensive sanitation work, requiring part of the wastes to be newly conditioned and several drums to be packaged again, the total weight of the wastes ready for dumping was doubled. The total radiation exposure for the personnel that took part in the individual phases of sanitation amounted to about 10 man-rem. The main causes for this contamination incident were unusual chemical composition of the concentrate to be solidified, unsufficient quality control and a position not suitabble for transport. The measures taken after this incident intend to avoid similar occurrences in the future. (orig.)
[de]
Im Juni 1978 ereignete sich im Hafen von Ijmuiden, Niederlande, ein Kontaminationszwischenfall mit aus der Schweiz stammenden Faessern, die radioaktive Abfaelle fuer die Meeresversenkung enthielten. Die von der Versenkungsaktion ausgeschiedene Charge von 207 Faessern musste bis zur naechstjaehrigen Meeresversenkung so saniert werden, dass diese Abfaelle den internationalen Vorschriften entsprachen und im Atlantik beseitigt werden konnten. Nach umfangreichen Sanierungsarbeiten, wobei ein Teil der Abfaelle neu konditioniert und mehrere Behaelter neu verpackt werden mussten, wurde das Gesamtgewicht der versenkungsbereiten Abfaelle verdoppelt. Die gesamte Strahlenbelastung fuer die an den einzelnen Sanierungsphasen beteiligten Personen ergab einen Wert von ungefaehr 10 man-rem. Eine ungewoehnliche chemische Zusammensetzung des zu verfestigenden Konzentrates, ungenuegende Qualitaetskontrollen sowie eine ungeeignete Transportlage waren die wesentlichsten Ursachen, die zu diesem Kontaminationszwischenfall gefuehrt haben. Mit den nach diesem Zwischenfall getroffenen Massnahmen sollten aehnliche Vorkommnisse in Zukunft vermieden werden. (orig.)Original Title
Die Sanierung konditionierter radioaktiver Abfaelle nach einem Kontaminationszwischenfall
Primary Subject
Source
Fachverband fuer Strahlenschutz e.V., Karlsruhe (Germany, F.R.); 536 p; May 1980; p. 133-153; 7. IRPA regional conference and 13. annual meeting of the Fachverband fuer Strahlenschutz e.V.: Radioactive wastes; Koeln, Germany, F.R; 16 - 19 Oct 1979
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Miscellaneous
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Conference
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AbstractAbstract
[en] Waste acceptance criteria for disposal have not yet been established in Switzerland. A guideline for immobilization, packaging and storage of low- and intermediate-level radioactive wastes from nuclear power plants in Switzerland became effective in 1980. This guideline is a basic document for the Swiss Nuclear Safety Department for licensing purposes and has the following aims: to define essential requirements; to specify quantitative limits; to provide some guarantee for acceptance of waste for disposal. This paper deals with different requirements mentioned in the guideline either qualitatively or quantitatively. One of the important values is the maximum leach rate of 10-2 kg.m-2.d-1 measured over a period of 150 days. The test method is in conformity with the prescription laid down in a draft version by the International Organization for Standardization. Another main requirement is the stability of the submerged waste form against swelling and cracking. Wastes from reprocessing of spent fuel are not covered by this guideline. (author)
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Secondary Subject
Source
International Atomic Energy Agency, Vienna (Austria); Commission of the European Communities, Brussels (Belgium); Nuclear Energy Agency, 75 - Paris (France); Proceedings series; 517 p; ISBN 92-0-020083-4; ; 1983; p. 51-55; IAEA; Vienna; International symposium on the conditioning of radioactive wastes for storage and disposal; Utrecht (Netherlands); 21-25 Jun 1982; IAEA-SM--261/26
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Book
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Conference
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