I choose configuration 1 over configuration 3 whenever I can because after a worker clears the beta/alpha monitor, I am fairly confident that the worker is not tracking loose surface contamination around. When possible, I much prefer to have RCA exit monitors inside the RCA so my licensed radioactive material is in the RCA when I find it on a worker.
That said, I have worked at a plant with chronically high background at the RCA exit, and there it made sense to put the gamma exit monitors around the corner to achieve adequate sensitivity. Heather Jackson, CHP, RRPT Sr. Health Physicist Palo Verde Nuclear Power Plant 623-393-6076 From: [email protected] [mailto:[email protected]] On Behalf Of Kinmark, Michael L. Sent: Tuesday, March 11, 2014 12:20 PM To: [email protected] Subject: Powernet: RE: Questionnaire Results - Placement of monitors at RCA exit - tail on question I understand. And just for clarification - CGS answer is also No. I was just asking out of curiosity. And consider also the other side of the “risk” coin. An individual could cross the threshold of the beta monitor into the RCA between the monitors and not “technically” exit the RCA. They may not be aware there is a difference in detection capabilities of the two monitors (5k dpm vs. 35 nCi) and therefore not recognize the RCAs are not the same - although both are posted (RCA) identically. So I understand there are always risks. While I have not seen those situations arise. But this topic started me thinking about possibilities. Perhaps others may take a now closer look as well and see if vulnerability exists. That’s the thing about Powernet we can think as well as share our thoughts with others. Respectfully, Michael Kinmark From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of McCarthy, John:(GenCo-Nuc) Sent: Tuesday, March 11, 2014 10:34 AM To: [email protected]<mailto:[email protected]> Subject: Powernet: RE: Questionnaire Results - Placement of monitors at RCA exit - tail on question Option 3 – Another risk, depending on where the gamma monitor is located (e.g., exit to protected area) that you could miss a potential intake of radioactive material should no one challenge the alarm. Jack McCarthy, CHP - le systeme D [cid:[email protected]] Senior Radiation Protection Technical Specialist Oyster Creek 609.971.4764 (work) [email protected]<mailto:[email protected]> From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Kallenbach, David J. (INPO) Sent: Tuesday, March 11, 2014 1:31 PM To: [email protected]<mailto:[email protected]> Subject: Powernet: RE: Questionnaire Results - Placement of monitors at RCA exit - tail on question The risk of using configuration 3 is that if you have a verified alarm with the gamma monitor (or alpha/beta monitor as in configuration 4), you have radioactive material outside the RCA. From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Kinmark, Michael L. Sent: Tuesday, March 11, 2014 1:22 PM To: [email protected]<mailto:[email protected]> Subject: Powernet: RE:Questionnaire Results - Placement of monitors at RCA exit - tail on question Just a quick question for those that responded as Configuration 1: Is anyone considering a change from 1 (or other) to Configuration 3? From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of [email protected]<mailto:[email protected]> Sent: Tuesday, March 11, 2014 6:19 AM To: [email protected]<mailto:[email protected]> Subject: Powernet: Powernet Questionnaire Results - Placement of monitors at RCA exit Thank you to all that responded to the powernet questionnaire on placement of the beta/alpha and gamma sensitive monitors at the RCA exit. Shown below is the result of the questionnaire. Responses: 21 (13) Configuration 1 – beta/alpha, gamma, RCA exit (3) Configuration 2 – gamma, beta/alpha, RCA exit (3) Configuration 3 – beta/alpha, RCA exit, gamma (0) Configuration 4 – gamma, RCA exit, beta/alpha (2) Configuration 5 – Other, Argos 5 with Zeus Original Questionnaire: Which configuration describes your plant. 1 - beta/alpha monitor followed by gamma monitor. RCA exit boundary is after the gamma monitor 2 - gamma monitor followed by beta/alpha monitor. RCA exit boundary is after the beta/alpha monitor 3 - beta/alpha monitor, RCA exit boundary, then gamma monitor 4 - gamma monitor, RCA exit boundary, then beta/alpha monitor 5 - Other configuration. Explain. - Argos 5 with Zeus Sun G. Lee, CHP Perry Nuclear Power Plant Radiation Protection 440-280-5039 work 440-465-8030 cell email: [email protected]<mailto:[email protected]> ----------------------------------------- The information contained in this message is intended only for the personal and confidential use of the recipient(s) named above. If the reader of this message is not the intended recipient or an agent responsible for delivering it to the intended recipient, you are hereby notified that you have received this document in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. 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