[ RadSafe ] RE: Limits on airflow from a contamination-control area

[Redmond, Randy (RXQ)]

David,

I think it is safe to say/assume (and I'm sure that someone on this list will point out my bad assumption if I am wrong) that air should not flow out of a contamination area; even though in many places, particularly old and poorly design facilities, it does. In those cases were there is an outward airflow, I perform air sampling to verify and document that the air activity averages well less than that level which will result in giving an individual not involved in radioactive material process(es)a dose that requires me to monitor them.  In my case, that is 100 millirem in one-year.

If you are looking for acceptable flowrates into the area, I use DOE-HDBK-1169-2003, Nuclear Air Cleaning Handbook.


Randy Redmond
B&W Y-12
Radiological Engineering
865.574.5640


Randy Redmond
B&W Y-12
Radiological Engineering
865.574.5640

-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On Behalf Of WHILLANS David -NUCLEAR
Sent: Monday, July 13, 2009 11:10 AM
To: radsafe at radlab.nl
Cc: VILLEMAIRE M J -NUCLEAR; BEREGIC Virgiliu -PICKERING; CHRISTIANI Warren -NUCLEAR
Subject: [ RadSafe ] Limits on airflow from a contamination-control area

Radsafers,

Our company is interested in industry standards for the control of airflow out of a contamination-control area, especially in a reactor environment, and how this is monitored. Specifically,

*	What air flow rate out of a contamination-control area is
considered acceptable in the rest of the industry? (possibilities, "air must always flow into the rubber area",  1 m/s, 1 km/h, etc.)
*	What techniques are used to determine that air flow does not
exceed the acceptable rate?  (possibilities: smoke bulb tests, pocket anemometer, "if you can feel it on your face it is too much",  etc.)

Please respond to 

Virgiliu D. Beregic
Health Physicist
Health Physics Department
Ontario Power Generation-Nuclear
1549 Victoria St East
Whitby, Ontario L1N 9E3
Tel: 905.430.2215 ext 3288
eMail: virgiliu.beregic at opg.com


D.W. Whillans, for Virgiliu Beregic
Health Physics Department  
Ontario Power Generation-Nuclear 



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