John, 1. Does your station control grinding tungsten tips? Not from a radiological standpoint
1. Who implements controls inside the RCA? Welders 1. Who implements controls inside the Restricted Area? Weld Shop 1. Who implements controls outside the Restricted Area? Warehouse 1. How do you dispose of the grinding dust? The material is unconditionally released using RETS LLD criteria and if no peaks are identified other than from naturally occurring nuclides, it is released. This attachment may be helpful. Seth. From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Thursday, October 14, 2010 9:43 AM To: [email protected] Subject: Powernet: Thorium in welding rod Stainless steel welding is typically performed with a process called Tungsten Inert Gas (TIG). Most of the tungsten rods used in this process are alloyed with thorium to enhance the properties of the weld. This places the rods into the category of Technically Enhanced Naturally Occurring Radioactive Material (TENORM). The process to prepare the rods for use includes cutting the rods into "tips", typically about an inch long. These tips are then sharpened to a point on a grinder. Although not licensed material, San Onofre has implemented measures to control the spread of this the small bits of weld rod created during the grinding process by having the welding group add ventilation and collection devices to the grinders used to sharpen the tips. We are preparing to formalize this process and are considering: assigning the responsibility to install and maintain the ventilation and collection equipment to the weld groups; have Industrial Hygiene check on the installation at some frequency; and have the welders deliver the filters and collectors to RP for disposal. We would like to do some informal bench marking and would appreciate your response to the following questions: 1. Does your station control grinding tungsten tips? Yes/No 1. 1. Who implements controls inside the RCA? RP / Safety / Other 1. 1. Who implements controls inside the Restricted Area? 1. 1. Who implements controls outside the Restricted Area? 1. 1. How do you dispose of the grinding dust? John W. Scott, CRP San Onofre Nuclear Generating Station (949) 368-6222 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. ---------------------------------------------------------------------
HPPOS-255 Airborne Thorium From Welding Rods.doc
Description: HPPOS-255 Airborne Thorium From Welding Rods.doc
