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. 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)? TVA's procedure allows for combining compartments as described in the Reg Guide as long as the highest dose area is monitored. With the exception of diving, most EDEx applications can be accomplished by combining compartments. 2. If "No" to #1 and your site combines compartments, what locations do you group together? Because of the weighting factors most applications will probably use thorax (W=0.38) and abdomen (W=0.5) with other compartments combined or used as appropriate. For example: 1. If the dose is coming from above, the head will be monitored and arms might also be monitored, but the legs will likely be combined with the abdomen. Because the abdomen has a W=0.5 it would be monitored (rather than combined with the thorax) to account for the dose gradient between the head, thorax and abdomen. 2. If the dose is coming from below the worker, the legs, abdomen, and thorax would be monitored but the head and arms would be combined with the thorax (for W=0.38+0.1+0.005+0.005=0.49) 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 yet. 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
