North Anna's response: We have the newer iPCMs and older Eleberline PCM 1B/1C. We struggle with radon due to our location and well water issues with worker's clothing.
Procedure guidance - DETERMINE which of the following methods will be used to provide reasonable assurance the PCM or PM alarms are due to radon, noble gas or their various decay products. a. Clothing and personal items are analyzed using a gamma spectroscopy system b. Whole Body Count c. Air samples are analyzed using a gamma spectroscopy system d. Direct frisk using a CM-11, Delta-5 or equivalent instrument and site specific ratio of beta to alpha radioactivity on item is measured, if applicable. e. Count rate taken at two different times (at least 10 minutes apart) determines contamination to be short lived (count rate decreases quickly over short period of time). IF the source of the PCM or PM zone(s) in alarm exhibits one or more of the following characteristics AND other indications using one or more of the methods as specified above are positive, THEN CONSIDER the activity is due to radon, noble gas or their decay products. * A pattern (e.g., both left and right pants legs indicate similar contamination) * Concentration of contamination around friction points or areas known to generate static electricity (e.g., knees, badge, hardhat, etc.) * Distributed contamination on clothing made of materials known to generate static electricity (e.g., polyester, nylon, wool, silk, etc.) IF clothing and personal items are analyzed using a gamma spectroscopy system OR Whole Body Count results verify the absence of nuclides other than naturally occurring isotopes for each alarm event THEN RELEASE clothing, personal item or individual. From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Wednesday, January 16, 2013 9:11 AM To: [email protected] Subject: Powernet: How do you deal with Radon at your plant? With the dry weather in Southern California, we get a big Radon affect. What works at your facility to allow the workforce ease in exiting RCA's effected by Radon during the monitoring process? Do you have Radon discriminating monitoring equipment? Jeff Carey U2/3 Health Physics Supervisor San Onofre Nuclear Generating Station 949-368-7545 [cid:[email protected]] CONFIDENTIALITY NOTICE: This electronic message contains information which may be legally confidential and/or privileged and does not in any case represent a firm ENERGY COMMODITY bid or offer relating thereto which binds the sender without an additional express written confirmation to that effect. The information is intended solely for the individual or entity named above and access by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution, or use of the contents of this information is prohibited and may be unlawful. If you have received this electronic transmission in error, please reply immediately to the sender that you have received the message in error, and delete it. Thank you.
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