Re: Contamination from Air Flow in Drain Systems

["William E. Cox" <COXWX@naesco.com>]

We have had some success controlling noble gas movement in the floor drain
system with a retrofit trap device that fits into the floor drains called a
"Dranjer".  I'm not sure of the manufacturer but they are available at
http://members.nova.org/~dsaum/index.htm These are commonly used in radon
mitigation applications for basement floor drains connected to drywells.
Similar to your loop seals, you have to keep them filled with water on some type
of routine basis.  A word of caution, they may restrict drain flow somewhat and
should be evaluated against any design basis for operability issues.

Billy Cox
Seabrook Station
Health Physics
(603) 773-7319
coxwx@naesco.com


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