Duke has aligned to INPO 05-008, for dosimetry relocation: Examples of conditions that may warrant repositioning of whole-body dosimetry or providing additional dosimeters are as follows:
Known work area dose rate gradients make it likely that total dose to a portion of the whole body will exceed the chest dose by more than 50 percent (for example, dosimeter worn on the head when most of the dose rate in the work area is from overhead piping). Dose rates in the general work area exceed 10 mrem/hour at 30 cm. It is anticipated that the difference in total dose would vary by at least 30 mrem for an individual during the work shift or 250 mrem of collective missed dose for the entire job. Multi-badging is considered for high dose / dose gradient jobs, based on ALARA cost benefit analyses. David A. Thompson, CHP Manager Nuclear Fleet RP [email protected]<mailto:[email protected]> (704) 382-6773 (704) 582-9394 (cell) From: [email protected] [mailto:[email protected]] On Behalf Of Holmes, Stephen J Sent: Monday, August 05, 2013 12:08 PM To: [email protected] Subject: Powernet: Dosimetry Relocation/Multibadging Quick Benchmark Just a couple quick questions on dosimetry relocation and multi-badging. I included the Ginna information for your reference, how do we compare? What is your site’s criteria for relocating Dosimetry? Ginna Criteria: Known work area dose rate gradients make it likely that a portion of the whole body will exceed the chest dose by more than 50% AND The DDE potentially missed by NOT moving dosimetry for one work shift (based on 8 hours) could exceed 30 mrem. OR The jobs collective DDE potentially missed by NOT moving dosimetry could exceed 250 mrem. Who determines that Dosimetry relocation is required? Ginna allows an RP Technician in the field to relocate dosimetry with Supervisor concurrence. What is your site’s criteria for using Multibadging (EDEX)? Ginna Criteria: Dose rates in work area exceed100 mrem/hr. AND The DDE is likely to exceed 300 mrem during the job. OR Measured or anticipated work area dose rate gradients make it possible for dose to one or more portions of whole-body to exceed that of the chest by more than 50 percent. Who is allowed to determine that multibadging is needed? Ginna requires uses of EDEX to be specified by ALARA on the RWP Stephen Holmes Sr. Plant Health Physicist CENG – RE Ginna 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
