Eric, At TVA we do see contamination leaching from the transfer cask after initial decontamination. We do not use the referenced decontamination agents and have similar coating on the transfer casks. As the loaded transfer cask is removed from the SFP we perform a continuous water spray and then decontaminate all accessible areas to < 1K before placement in the work platform for welding/processing. We do not re-wet the transfer cask but will still see contamination leaching particularly from the sides of the transfer cask. At our two PWR sites the SFP activity is low so the subsequent leaching is typically in the 5k to 10k range. At our BWR site the SFP activity is much higher and the leaching can be 50k or greater.
Joel Armstrong Spent Fuel Storage WBN Phone – 423-365-8903 TVA Cell – 256-497-1405 From: emgoldin [mailto:emgol...@yahoo.com] Sent: Tuesday, February 13, 2018 1:14 PM To: powernet Subject: [powernet] Experience with Liquinox (Alconox) decon agent TVA External Message. Please use caution when opening. We’re looking for some OE regarding the use of Liquinox (Alconox) brand decontamination agent. We are seeing some odd results when deconning a spent fuel transfer cask that has a coating of (Carboline) Carboguard 890 epoxy. The cask is lifted from the pool, deconned successfully to less than 1k smearable and then allowed to dry. When rewetted, contamination appears at easily detectable levels, requiring significant additional decon. Does anyone else have experience with such a condition and, if so, what did you do to avoid the significant leaching (if that’s what it is)? Thanks, Eric Goldin, CHP RP Support, San Onofre Nuclear Generating Station 949.368.6727<tel:949.368.6727> eric.gol...@sce.com<mailto:eric.gol...@sce.com> or emgol...@yahoo.com<mailto:emgol...@yahoo.com> Sent from my Verizon, Samsung Galaxy smartphone