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.
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
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
Sent from my Verizon, Samsung Galaxy smartphone