You can farm your gamma spec system to trend I-131 in BWR Heater Drain Condensate against Turbine air samples to get a feel for the magnitude in air vs liquid. Doing the same for RCS would let you know about the Refuel Floor and other primary system valves.
Te-132 is another interesting actor that will generate I-132 only after the other iodine isotopes have decayed away. I've seen two cases where I-132 caused a problem during a refueling outage. Short-lived and throws off a lot of photons to set off portal monitors. No dose consequence but an inconvenience to workers. You'll want to query about 10 yrs of data and you'll have quite a bit of scatter. While your gamma spec measurement would be consistent each time, the time and location of my iodine samples could vary causing increased scatter in the data. You can create a scaling factor form uCi/cc in coolant vs uCi/cc in air and will get a lot of scatter. You'll need to dig into the air sample distribution to separate turbine, refuel floor, etc. [cid:[email protected]] Glen Vickers, CHP Exelon Corp RP Technical Lead 815-216-2723 (work/cell) From: Bagwell, Bradley R [mailto:[email protected]] Sent: Wednesday, October 18, 2017 8:51 AM To: Sorber, Bob; '[email protected]' Cc: Branham, Matt; Costello III, Mark V; Martinec, Cyndi Subject: [EXTERNAL] [powernet] RE: Estimating Outage Airborne Activities from Operating RCS Activities Bob, Matt Branham forwarded the question to Mark Costello in the GO Radiological Engineering group. Let me see what they respond with first. Matt stated that he thought they had modeled something similar in the past. Thanks! Brad Bagwell E&C Sr. Scientist - Effluents Brunswick Nuclear Plant 910-343-6635 [cid:[email protected]] From: Sorber, Bob Sent: Tuesday, October 17, 2017 2:44 PM To: '[email protected]' Cc: Bagwell, Bradley R; Branham, Matt; Costello III, Mark V; Martinec, Cyndi Subject: Estimating Outage Airborne Activities from Operating RCS Activities Duke Energy would like to know of a resource to help us estimate outage airborne concentrations (DAC values) from pre-shutdown reactor coolant system iodine activity following a fuel failure. Thanks for your support. Bob Sorber Corporate Radiation Protection 704-382-7259 [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
