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AW: Manipulator Port Decontamination
Dave,
our manipulator ports had nearly the same dimensions, and we found only one
way - supercompacting and filled into waste drums.
But based on 10 year decommissioning experince of our Hot-Cell-Building we
found the most effective way to decontaminate steel parts is steel blasting.
We did this also with tubes from german NPP's. After blasting, the tubes
were free of contamination and the waste drums showed dose rates of some
mSv/h.
Blasting with soft particles like dry-ice or even nutshells could remove
only paint or grease and oil layers.
Hope this helps.
Peter
Peter Hewing
Siemens Power Generation
Seligenstädter Str. 100
D-63791 Karlstein
Germany
Phone +49 6188 780251
Fax +49 6188 780690
e-mail:Peter.Hewing@off1.siemens.de
> -----Ursprüngliche Nachricht-----
> Von: Dave Biela [mailto:BielaD@wvnsco.com]
> Gesendet am: Montag, 1. Oktober 2001 16:39
> An: radsafe@list.vanderbilt.edu
> Betreff: Manipulator Port Decontamination
>
> We are decontaminating manipulator ports, which are 10 inch
> holes through 5 foot shield walls. The ports are lined with
> carbon steel. We are looking for good methods to clean these
> ports (contamination levels are over one million dpm/100
> cm-sq). We are using brushes (wire then cloth) on drill
> motors, but are generating a lot of waste. Does anyone have
> ideas on cleaning methods that do not generate a lot of
> waste. NOTE: These are old ports and we do have a method to
> keep them clean once we clean them this time.
>
> Thanks in advance
> Dave Biela
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