Mr. Miller, Thanks for this very helpful information. I am not sure how we missed the OE on the Elmer's glue but sounds like we need to look harder at UT gel. Happy Thanksgiving to you!
________________________________ From: [email protected] [[email protected]] On Behalf Of [email protected] [[email protected]] Sent: Wednesday, November 21, 2012 9:31 AM To: [email protected] Subject: RE: Powernet: RE: Fixative for Permanent Cavity Seal Ring Installation Jerry, Elmer’s glue was determined to wad up into little balls in the reactor. GE wrote a SIL about 20 years ago about this occurring and potential for crud induced fuel failures. It was a Dresden HP that identified the issue and worked with GE on the SIL. While I was in the BWR world we change from Elmer’s glue to UT Gel. Quad Cities first switched to UT Gel in ’90 and Dresden followed in ‘92. Engineering uses the gel for their UTs and, if most of the residual gel is removed, there are no issues associated with its use. I have been at Braidwood for the last 9 years and use UT gel extensively throughout the station. We have no issues associated with UT gel. The gel is diluted by using a 7:1 water to gel mixture. We put the gel/water mixture in bug/garden sprayers for large applications and in small sprayers for localized applications. When the diluted gel is dried it provides a thin shell. If not properly diluted the gel will not harden and surfaces can become a bit slippery. Harry L Miller Exelon Nuclear Braidwood Station 815-417-2713 [email protected] ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Akins Jr, Leon B. Sent: Tuesday, November 20, 2012 2:56 PM To: '[email protected]' Subject: Powernet: RE: Fixative for Permanent Cavity Seal Ring Installation We do not use a fixative but have used a heavy blue matting that is typical for heavy maintenance…..contact Kenny Young at CR3 for more information. 352-795-6486 x-3281 Thanks, Bryant Akins Superintendent Radiation Control Crystal River Nuclear Plant work cell 352-464-7964 [email protected] From: [email protected] [mailto:[email protected]] On Behalf Of Barber, Jerry Sent: Friday, November 16, 2012 4:02 PM To: '[email protected]' Subject: Powernet: Fixative for Permanent Cavity Seal Ring Installation We would like to know what Fixatives other sites recommend for helping to control contamination in the upper cavity around the reactor vessel during preparation/installation of permanent cavity seal ring. We typically use a Elmer’s glue water mixture fixative for most applications, but there are concerns that this may be to “gummy” to put on the floor with work being performed on the surfaces. We are going to mock up whatever we plan to use so we will have the opportunity to test. Thanks in advance for your help, and Happy Thanksgiving! Jerry Barber Robinson Nuclear Plant ************************************************** 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. ************************************************** ----------------------------------- Powernet - a service of the Health Physics Society Power Reactor Section Powernet archives at http://www.mail-archive.com/[email protected]/ Reply to: [email protected] If Questions, contact Mike Russell, CHP at [email protected]
