Duke Energy fleet response as follows:
1. Does your plant use all seven compartments per Regulatory Guide 8.40, Table 1 when using EDEX (i.e. every multipack has seven dosimeters)? Yes and no. By procedure, we have multipack "templates". The need/use of the multipack determines the pack type and thus how many dosimeters are in it. The maximum number of whole-body locations monitored would be 8 (7 compartments defined by RG 8.40 and 1 on the Back that is a combination of chest and abdomen weighting factors). Functionality within Sentinel V1.11 allows us monitor the chest, abdomen, and back with 3 separate dosimeters and treat them as "one" compartment. If you would like to know details, you can contact me directly and I will describe it. 2. If "No" to #1 and your site combines compartments, what locations do you group together? Depending on the pack type, the chest, abdomen, and back may be grouped together with a single weighting factor. We also have a procedure option to use the "shield" method described in RG 8.40 C.3.c (on page 6), which involves combining compartments. 3. Has your site performed any calculations to determine the delta in total EDEX dose using all seven dosimeters versus the overall dose using combined compartments? If "Yes", would you be willing to share your results with me at [email protected]<mailto:[email protected]>? Not on a regular basis that I am aware of. In my opinion, monitoring the most locations possible will give you the most accurate results. Compartments should only be combined if job performance or safety would be adversely impacted wearing the full set of dosimeters. (confined space entry for example) Chris Courtenay Engineer, Duke Energy 980-875-5005 "To the optimist, the glass is half full. To the pessimist, the glass is half empty. To the engineer, the glass is twice as big as it needs to be." From: [email protected] [mailto:[email protected]] On Behalf Of Chlebowy, Corrin N Sent: Wednesday, September 18, 2013 4:11 PM To: [email protected] Subject: Powernet: EDEX Compartment Usage Inquiry Nine Mile Point is conducting a dosimetry focus self assessment. Any and all information you can provide on the following effective dose equivalent external questions would be greatly appreciated. 4. Does your plant use all seven compartments per Regulatory Guide 8.40, Table 1 when using EDEX (i.e. every multipack has seven dosimeters)? 5. If "No" to #1 and your site combines compartments, what locations do you group together? 6. Has your site performed any calculations to determine the delta in total EDEX dose using all seven dosimeters versus the overall dose using combined compartments? If "Yes", would you be willing to share your results with me at [email protected]<mailto:[email protected]>? Thank y'all for your time. Have a wonderful day. Corrin Chlebowy [email protected]<mailto:[email protected]> Associate Plant Health Physicist Nine Mile Point Nuclear Station 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
