looking out the window to the east - looks like the carbon based Cs-137 concentrators are gone
From: [email protected] [mailto:[email protected]] On Behalf Of Sewell, Linda Sent: Friday, March 30, 2012 2:54 PM To: '[email protected]' Subject: Powernet: RE: Baseline Bioassay Sampling Hi, Diablo Canyon's response We do entrance and exit whole body counts. We do perform in-vitro tritium bioassay for all SFP diving activities. In addition to engineering controls and/or respirators we do require lapel air samplers for work in Alpha level 3. In a sense, I think these are functioning as that first level of "bioassay" for this type of work. Further bioassay requirements, if any, are based on lapel air sampling results. In addition, off normal events may also trigger bioassay requirements. Happy Friday All, Linda Linda M. Sewell, CHP Principal Health Physicist Pacific Gas & Electric Company Diablo Canyon Power Plant MS 119/1/117 PO Box 56 Avila Beach, CA 93424 P: 805.545.4315 | F: 805.545.2618| [email protected]<mailto:[email protected]> From: [email protected]<mailto:[email protected]> [mailto:[email protected]]<mailto:[mailto:[email protected]]> On Behalf Of Holmes, Stephen J Sent: Friday, March 30, 2012 10:49 AM To: [email protected]<mailto:[email protected]> Subject: Powernet: Baseline Bioassay Sampling I am looking at industry best practices for performing baseline and routine bioassay (in-vivo and in-vitro). At Ginna we do not do baseline or routine/confirmatory WBCs, we take credit for our passive monitors (portal monitors) which are set to alarm at <1% ALI of the station DAW mixture. We do have provisions in our procedures for performing in-vitro tritium bioassay prior to and after SFP diving activities. We do not currently have guidance in our procedures for performing baseline or routine bioassay for workers who work in Alpha Level 3 / TRU areas. We do not often work in Alpha Level 3, but we do have a few areas that are characterized as such. I do not know of any requirement to perform baseline or confirmatory in-vitro bioassay for workers potentially exposed to Alpha contamination. However, without performing in-vitro monitoring, the only thing we have to back up our Alpha contamination controls are job coverage surveys and air samples. How do our practices line up with the rest of the industry? Thanks, -Steve Stephen J Holmes, PE Sr. Plant Health Physicist, CENG-RE Ginna NPP [email protected]<mailto:[email protected]> 585-771-3577; 585-545-1661 (cell) >>> 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. -IP1
