RE: Manipulator Port Decontamination

["Morgan, Ben" <ben.morgan@pgnmail.com>]

Dave,



There are various processes that you could use:



Ice blasting - uses ice pellets - good for surface contamination, but does

produce contaminated liquid.



Dry ice blasting - uses frozen CO2 pellets - also good for surface

contamination and essentially a dry process with little waste other than the

removed material



Bead blasting - uses plastic beads - can remove some of the material below

the surface - produces solid waste



Sponge blasting - uses sponge impregnated with abrasive - removes various

amounts of material depending on the grit of the abrasive, produces solid

waste



Hydrolasing - uses high pressure water - can remove material below the

surface, but may cause damage (cuts, holes) if not used carefully, produces

liquid waste



Chemical decontamination - various chemicals are available that can remove

contamination on and below surfaces (EPRI has done a lot of work on this),

may not be good for carbon steel - produces liquid or solid (resin beds)

waste



Web searches on the above would probably locate equipment vendors or

contractors for you.



Regards,



Ben



ben.morgan@pgnmail.com







-----Original Message-----

From: Dave Biela [mailto:BielaD@wvnsco.com]

Sent: Monday, October 01, 2001 10:39 AM

To: radsafe@list.vanderbilt.edu

Subject: 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 



************************************************************************

You are currently subscribed to the Radsafe mailing list. To unsubscribe,

send an e-mail to Majordomo@list.vanderbilt.edu  Put the text "unsubscribe

radsafe" (no quote marks) in the body of the e-mail, with no subject line.

************************************************************************

You are currently subscribed to the Radsafe mailing list. To unsubscribe,

send an e-mail to Majordomo@list.vanderbilt.edu  Put the text "unsubscribe

radsafe" (no quote marks) in the body of the e-mail, with no subject line.