Previously used Fuel Handling tools. Fuel handlers have poles with varying types of needle nose pliers on the end for retrieving foreign material. In the past I'd have them reach inside the Tri-Nuclear filter and pull out some media. We'd shoot for 3-10 mrem/hr on an ion chamber to ensure we had enough sample for good analysis.
TRU's normally drive Tri-Nuclear filter waste class from A to C and that's where sampling the actual media on the inside will be more representative on the crud trapped on the inside diameter of the filter vs smearing the outer diameter screen mesh. Fuel Handlers typically have more than one year of filters in the pool when you do a clean-out project. Since these liners are often Class C, we'd sample one filter from each year for 10CFR61. This is also important for assessing the decay of Co-60 over time. Characterizations only as good as the samples... Glen Vickers, CHP Exelon Corp RP Technical Lead 815-216-2723 (work/cell) From: Cady, Jeffrey James:(GenCo-Nuc) Sent: Friday, October 07, 2016 6:19 PM To: [email protected] Cc: Gagnon, Michael:(GenCo-Nuc) Subject: [powernet] FW: Filter sampling method question From: Gagnon, Michael:(GenCo-Nuc) Sent: Friday, October 07, 2016 6:18 PM To: Cady, Jeffrey James:(GenCo-Nuc) Subject: Filter sampling method question We are looking to learn how others sample filters for 10CFR Part 61 analysis. In particular, we have filters with a heavier gauge steel screen that our current filter punch will not penetrate. Also, some of these filters are stored underwater in the Spent fuel Pool. These are inside loading filters (i.e. the water enters the center and exits the outer surface). What experience do you have with alternate sampling methods, we have cut filters that have not been in the pool of this type in the past, but this evolution has risks associated with it. We have tried smears with limited success (difficulty getting enough activity on the smear) and smear rinsing off as it is brought up through the pool. Michael Gagnon, CHP Braidwood Nuclear Station Ph (815)417-2733 Fax (815)417-2410 Email: [email protected]<mailto:[email protected]> This Email message and any attachment may contain information that is proprietary, legally privileged, confidential and/or subject to copyright belonging to Exelon Corporation or its affiliates ("Exelon"). This Email is intended solely for the use of the person(s) to which it is addressed. If you are not an intended recipient, or the employee or agent responsible for delivery of this Email to the intended recipient(s), you are hereby notified that any dissemination, distribution or copying of this Email is strictly prohibited. If you have received this message in error, please immediately notify the sender and permanently delete this Email and any copies. Exelon policies expressly prohibit employees from making defamatory or offensive statements and infringing any copyright or any other legal right by Email communication. Exelon will not accept any liability in respect of such communications. -EXCIP
