See the St. Lucie response below in RED From: Schlise, Larry D [mailto:[email protected]] Sent: Thursday, December 17, 2015 12:07 PM To: [email protected] Cc: [email protected]; Byrum, William F Subject: [powernet] Gamma sensitive contamination monitor optimization and calibration practices
This is an EXTERNAL email. Exercise caution. DO NOT open attachments or click links from unknown senders or unexpected email. ________________________________ Duke Energy is requesting information on your sites' practices for calibration and optimization of gamma sensitive portal monitors and article monitors. Duke Energy's EnRad Laboratories is beginning the process of standardizing the calibration and optimization of our gamma sensitive portal and article monitors in our six site, eleven unit nuclear fleet as an initiative following the merger of Duke Energy and Progress Energy. We are requesting answers to the following questions: 1. What is your site's calibration source isotope for gamma sensitive contamination monitors? Cs-137 for gamma detectors 2. What is your site's gamma sensitive contamination monitor optimization source isotope? Cs-137 for gamma detectors 3. What is the basis for the calibration and optimization source isotopes selected? The energy of Cs-137 is similar to the plant contamination effective energy, which is evaluated each cycle (and for each unit) for variation. Also, the long relative half-life is a plus. a. Manufacturer recommendation or other? The tech manual also recommends Cs-137 4. Do you use mixed isotope sources for calibration and/or optimization of gamma sensitive contamination monitors? Only NIST-traceable Cs-137 sources are used for calibration and response checks. We use a combination of vendor sources and smears representative of plant contamination (analyzed at an offsite lab for hard-to-detects, etc.) when performing sensitivity studies. Larry Schlise RP Scientist, EnRad Labs Duke Energy [EnRad Logo.jpg] 13339 Hagers Ferry Rd Mail Stop MG03A2 Huntersville, NC 28078 980-875-5395 (Office) 704-787-3401 (Mobile)
