Palo Verde sets the alarm set point for SAMs to 5,000 dpm. With respect to the SAM setpoint, we calibrate our tool monitors with the source in the center of the chamber and establish the alarm setpoint from that geometry. However, since the vast majority of items surveyed for release are relatively small they are monitored closer to the bottom detector; hence, a higher efficiency area and a de-facto lower setpoint without changing the actual detection limit that we have established. This makes for a more robust program and can greatly increase the chances of detecting sub-surface activity that is easily missed by a frisker.
********************************************************************** 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 Pell, Bryan Sent: Thursday, January 27, 2011 9:38 AM To: '[email protected]' Subject: Powernet: Sensitivity Study Benchmark At Ginna Station we have performed a sensitivity study on our personnel exit monitors, basically seeing how low we can reasonably go with our alarm set points and adjusted them accordingly. The question has come up about the SAMs. Does your site set the alarm set points to 5,000 dpm or have you performed tests to see how low you can go and adjusted accordingly? Thanks for your input... Bryan S. Pell R.E. Ginna Nuclear Power Plant Senior Plant Health Physicist (585) 771-3804 [email protected] P Please consider the environment before printing >>> 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. CEG-IP1 --- 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.
