We don't have any locations that kind of difference. We occasionally have individuals in a couple of offices that will pick up 10-12 mrem of the OSLD and not enter the for the quarter. With the Thermo EDs (set with 7% bias), we see a 20% over response in N-16 areas, but with the scattered / skyshine there hasn't been any noticeable difference. Our BREs nor any offices are significantly close to the Turbine. We do have a hallway and some other unoccupied locations which we monitor that does receive some significant dose over a year. We did place a shield over the top of the HP turbine when we did an upgrade a few years back as part of power uprate in order to reduce the impact to the site boundary dose.
John Geyster RP Support Supv Vermont Yankee (802) 258-5471 From: [email protected] [mailto:[email protected]] On Behalf Of Bebb, Jeremy L. Sent: Wednesday, August 14, 2013 2:35 PM To: '[email protected]' Subject: Powernet: Turbine Shine All BWRs, We have a discrepancy in our DLR to DRD data in that the DLRs always report higher than our DLR dose. We have maintenance personnel located on the same elevation as our turbine. We see approximately 8 rem worth of exposure annually that is unaccounted for by DRD measurements. We also have security personnel located in BREs around the site that received between 1-2 rem annually from turbine shine. Do any of your sites have personnel located within close proximity to your Turbine? If so what kind of delta between your DLR and DRD readings do you see? What kind of DRDs and DLRs are you utilizing and what is your DRD bias? Thanks, Jeremy Bebb Staff Health Physicist Cooper Nuclear Station (402) 825-5026
