Palo Verde provides the following response: Palo Verde used DOE PNL-5278/UC-41 Effects of Particle Size and Velocity on Burial Depth of Airborne Particles in Glass Fiber Filters (D.P. Higby, November 1984) since the particle sizes used in this study most closely resembled those measured at PVNGS (~0.66 um, 1.72 um, and 3.07 um). These figures were obtained from an SAIC Report performed at Palo Verde (PASS Sample Line Particulate Loss Measurement) during start-up in 1985.
The Higby / DOE study showed losses of approximately 15% due to burial in the filter matrix and recommends that you assume a 10-15% loss due to uncertainty in reference to particle size and sampling velocity. Therefore, we use a "Filter Transmission Factor" of 15% to adjust the calculated efficiency of our SAC-4 alpha counter scalar to correct for counting losses due to burial in the glass-fiber filter. Seth. ********************************************************************** Seth J. Kanter, CHP, RPT Sr. Health Physicist Palo Verde Nuclear Generating Station Mail Sta. 7397 5801 S. Wintersburg Rd. Tonopah, AZ 85354 Phone (623) 393-3130 Fax (623) 393-2487 Unless otherwise noted, all opinions are my own Liviu Librescu ********************************************************************** From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Wednesday, September 22, 2010 2:13 PM To: [email protected] Subject: Powernet: Alpha self absorption or transmission factor Exelon would appreciate any input for the following: What does your site use for an alpha self absorption (or transmission) factor? What is the basis? Thanks in advance, Jeffrey J. Cady, CHP, RPT Mgr RP Technical Support Exelon Nuclear Dresden Station Phone: (815) 416-2719 [email protected] ************************************************** This e-mail and any of its attachments may contain Exelon Corporation proprietary information, which is privileged, confidential, or subject to copyright belonging to the Exelon Corporation family of Companies. This e-mail is intended solely for the use of the individual or entity to which it is addressed. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution, copying, or action taken in relation to the contents of and attachments to this e-mail is strictly prohibited and may be unlawful. If you have received this e-mail in error, please notify the sender immediately and permanently delete the original and any copy of this e-mail and any printout. Thank You. ************************************************** Email Firewall made the following annotations --------------------------------------------------------------------- --- NOTICE --- This message is for the designated recipient only and may contain confidential, privileged or proprietary information. If you have received it in error, please notify the sender immediately and delete the original and any copy or printout. Unintended recipients are prohibited from making any other use of this e-mail. Although we have taken reasonable precautions to ensure no viruses are present in this e-mail, we accept no liability for any loss or damage arising from the use of this e-mail or attachments, or for any delay or errors or omissions in the contents which result from e-mail transmission. ---------------------------------------------------------------------
