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As part of decommissioning a small reactor, a metal
tank with the dimensions of 15 feet high, 8 feet 10 inches in diameter, and 3/8
inch thick must be removed. The tank must be cut in sections to transport
for disposal. Does anyone have information on a remote cutting and
handling system that will cut the tank in sections and manipulate the pieces
into a transportation container for eventual transport to a disposal
facility. There is a crane in the building with a capacity of 65
tons for support of the decommissioning procress.
Below are the radiological details of the
tank and a proposed 3 feet by 3 feet section of the tank.
The tank is neutron activated with Co-60 being the
predominant photon emitter. Field measurements with an ion chamber
indicate a metal coupon sample of the tank is 60 mrem/hr @ 12 inches and 11
mrem/hr @ 24 inches. Open window closed window measurements one inch
from the sample indicate no significant beta dose rates in addition to the
photon dose equivalent rate. Using Microshield, the dose equivalent rate
on a 3 feet by 3 feet section of the tank will deliver 4.7
rem/hr @ 24 inches, 0.8 rem/hr @ 6 feet, and 0.2 rem/hr @ 12
feet.
You may respond to my email address at cflaney@bellsouth.net.
Thanks for any information you can
provide.
Claude Laney, CHP
Director, Technical Support
Industrial and Environmental Services,
Corp.
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