St. Lucie utilizes passive monitoring. We do require a witnessed entrance only count in an GEM-5 portal monitor set to alarm at 25 nCi (based on Cs-137 using a two-step count) prior to obtaining dosimetry. If the individual alarms (only get one try), we perform a whole body count. We have both ARGOS-5AB with Zeus gamma detectors and GEM-5 monitors at the RCA exit with conservative alarm setpoints. A sensitivity study was performed on both monitors, and the ARGOS was ~2X more sensitive than the GEM-5s using an anthropomorphic phantom.
From: Sewell, Linda [mailto:[email protected]] Sent: Tuesday, November 24, 2015 1:37 PM To: [email protected] Subject: [powernet] Whole Body Counting Benchmark This is an EXTERNAL email. Exercise caution. DO NOT open attachments or click links from unknown senders or unexpected email. ________________________________ Hi All, I don't see a recent benchmark on this subject. Does your site perform exit whole body counting? If no, do you have any special documentation for passive monitoring or just take credit for the normal RCA egress process? For Diablo Canyon we currently do perform exit whole body counting. Thanks and Happy Thanksgiving, Linda Linda M. Sewell, CHP Principal Health Physicist Pacific Gas & Electric Company Diablo Canyon Power Plant MS 119/1/117 PO Box 56 Avila Beach, CA 93424 P: 805.545.4315 | F: 805.545.2618| [email protected]<mailto:[email protected]>
