I am assuming you are just talking about the equipment drain sump being covered and not the floor drain sump. Your process is opposite of what we do here. We currently only cover the floor drain sump during outage with a screen to prevent FME entry into the floor drain sump. The equipment drain sump is covered with a plate, no idea how water tight that is. The screens are very contaminated after the outage is over and they are removed
Your setup of the under vessel area sounds similar to what we have [cid:[email protected]] I believe they monitor leakage by the runtime of the sump pumps but could get you in contact with someone if you need further detail. I am not involved in that part of the process Chuck Creamer Charles E. Creamer Health Physicist Tennessee Valley Authority Browns Ferry Nuclear Plant P.O. Box 2000 (Mail Stop NAB-1G-BFN) Decatur, Al. 35609-2000 Phone: 256-729-2983 Fax: 256-729-3101 Pager: 1-800-323-4853, pin 30-053 mailto:[email protected] REMEMBER - You don't know what you don't know This electronic message transmission contains information which may be TVA SENSITIVE, TVA RESTRICTED or TVA CONFIDENTIAL. Any misuse or unauthorized disclosure can result in both civil and criminal penalties. If you are not the intended recipient, be aware that any disclosure, copying, distribution or use of the content of this information is prohibited. If you have received this communication in error, please notify me immediately by email and delete the original message. From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Thursday, October 24, 2013 2:14 PM To: [email protected] Subject: Powernet: undervessel area Exelon, LaSalle County Station would like to know: If your site utilizes a mat to cover the under vessel sump area to monitor leakage during operation. Each outage the mat is removed (destroyed in the process) and another mat is installed. This activity results in ~ 1 Rem of exposure and expenses for a new mat ~ 15K. LaSalle is requesting assistance to eliminate the mat and utilize another mechanism to monitor leakage. The mat is used because the equipment and floor drain sumps are located under vessel and are covered with multiple plates that fit into place, these plates have seams which can leak , which would affect leakage monitoring. Please answer the questions below. 1. Do you have the same sump configuration as LaSalle - where both sumps are located under vessel? 2. Do you use a mat under vessel for your sumps? 3. If you do use a mat, is it changed out each outage? 4. If you don't use a mat and have the same configuration as LaSalle what mechanism do you use to monitor leakage? Thanks Steve Lorenz [cid:[email protected]] LaSalle Station Decon/ARW Supervisor '(815) 415-2390 Pager:(815) 983-0340 Home:(815) 436-5053 Cell:(815) 592-6276 Fax:(815) 415-4018 [email protected]<mailto:[email protected]> This e-mail and any attachments are confidential, may contain legal, professional or other privileged information, and are intended solely for the addressee. If you are not the intended recipient, do not use the information in this e-mail in any way, delete this e-mail and notify the sender. -EXCIP
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