Thanks - that's the path we're on. A complete new system is on its way here to Browns Ferry.
Joel Armstrong ALARA Engineer Dry Cask Storage Project Browns Ferry Nuclear Plant (256) 729-4998 Office (256) 497-1405 Cell From: STEVIE VAUGHAN [mailto:[email protected]] Sent: Friday, August 03, 2018 11:04 AM To: [email protected] Cc: Armstrong, Joel L Subject: RE: (External):[Powernet] Dry Cask Welding TVA External Message. Please use caution when opening. Joel, I spoke with our Holtec project manager here at SONGS. Although we have not had the AWS weld heads fail, we have had to have minor repairs performed. My recommendation is aligned with yours as far as no manual welding. From a dose impact prospective to personnel, the right thing to do is get a replacement AWS weld head rather than manual welding. Stevie Vaughan DA Oversight Mgr., RP, Chem., Enviro., & Waste San Onofre Nuclear Generating Station T. 949-368-7788 | M. 949-683-4151 5000 Pacific Coast Hwy, San Clemente, CA, 92672 [cid:[email protected]] From: Powernet [mailto:[email protected]] On Behalf Of Armstrong, Joel L via Powernet Sent: Friday, August 03, 2018 5:37 AM To: powernet <[email protected]> Cc: Armstrong, Joel L <[email protected]> Subject: (External):[Powernet] Dry Cask Welding Checking to see if there is any experience out there for manually welding the closure rings on a HOLTEC MPC. Both our primary and backup AWS weld heads have failed and we are all stop until repairs can be made. The closure rings have been installed, fit up, and tacked and the cross seam welds have been made. The inner and outer circumferential welds remain. These can be welded using the AWS for 15 to 20 mrem. Initial estimates for manual welding are 200 to 400 mrem. Note that I am not seriously considering allow this to proceed due to dose concerns. Just doing due diligence to see if there is any experience in the industry for manually welding the closure rings and what dose reduction techniques were deployed. Joel Armstrong ALARA Engineer Dry Cask Storage Project Browns Ferry Nuclear Plant (256) 729-4998 Office (256) 497-1405 Cell
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