At Diablo Canyon, we use the alarm test function on the GEM5s. We do all detectors daily at 6" except foot detector @ contact.
From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Monday, July 08, 2013 11:41 AM To: [email protected] Subject: RE: Powernet: Portal monitor We used to check the PM-7 by putting the source at the body position and stepping into the monitor. INPO then decided that all tests would be done at 6 inches. With the PM-7, you can no longer stand in the monitor with the source and obtain a distance of 6". You won't get the effects of background suppression when a person stands in the monitor, but 6" is a common distance decided upon. The argos monitor has plastic scintillator detectors 3" behind the detector grill. We perform the source check at 3" from the grill which would be 3" into the chest cavity of a worker. Traditionally, you'd follow the recommendations by the manufacturer, but now INPO recommendations are overriding manufacturer recommendations. The key for commercial power reactor people is to follow the recommendations by INPO and try not to stray too far away from the manufacturer recommendations to also keep the NRC happy. Glen Vickers Exelon Corp RP Technical Lead, CHP 815-216-2723 (work/cell) From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Eaton, Eric:(Constellation) Sent: Tuesday, July 02, 2013 1:27 PM To: '[email protected]' Subject: Powernet: Portal monitor Greetings all... After attending the Canberra User's Group Meeting last week, it came to light that some facilities perform the Daily Source Check on their Portal Monitors differently. Thus the basis for my question... Does your facility source check each detector of your portal monitor using the alarm test function(like the Argos or PM-7)? Or Do you source check your portal monitor by placing the source in the middle of the monitor using the alarm test function? Or Do you source check your portal monitor by having a technician step into the monitor (in normal) with the source on their person? Or, something else? Thanks in advance for your responses... Eric A. Eaton Ginna Station R.P. Technician This e-mail and any attachments are confidential, may contain legal, professional or other privileged information, and are intended solely for the addressee. If you are not the intended recipient, do not use the information in this e-mail in any way, delete this e-mail and notify the sender. -EXCIP PG&E is committed to protecting our customers' privacy. To learn more, please visit http://www.pge.com/about/company/privacy/customer/
