1. Histograms are used as part of the investigation into dose and dose rate alarms. Depending on the event that can be kept with other paperwork as part of the investigation. Can be very useful in event recreation.
2. Non-event histograms are not normally maintained for invalid and anticipated alarms although they can be looked at to ensure the alarm was truly anticipated or could have been a dosimeter malfunction. 3.I have pulled histograms off dosimeters for nonevents for reasons other than #2 but that is not typical. We do not try and retain all histograms so if you wait too long after the fact that data is overwritten on the dosimeter. Chuck Creamer Health Physicist Radiation Protection Tennessee Valley Authority; Browns Ferry Nuclear Plant P.O. Box 2000 (Mail Stop NAB-1G-BFN) Decatur, Al. 35609-2000 256.729.2983 (w) [email protected]<mailto:[email protected]> [https://lakeinfo.tva.gov/web/images/tva_logo_32b.png]<https://tva.com/> [https://lakeinfo.tva.gov/web/images/blue_line.png] [https://lakeinfo.tva.gov/web/images/facebook2.png]<https://www.facebook.com/TVA/>[https://lakeinfo.tva.gov/web/images/twitter2.png]<https://twitter.com/tvanews>[https://lakeinfo.tva.gov/web/images/instagram2.png]<https://instagram.com/tva>[https://lakeinfo.tva.gov/web/images/youtube2.png]<https://www.youtube.com/user/TVANewsVideo>[https://lakeinfo.tva.gov/web/images/linkedin2.png]<https://www.linkedin.com/company/tva>[https://lakeinfo.tva.gov/web/images/flickr2.png]<https://www.flickr.com/photos/tennesseevalleyauthority/> NOTICE: This electronic message transmission contains information that 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: Jonas, Kathy L [mailto:[email protected]] Sent: Wednesday, October 04, 2017 1:22 PM To: [email protected] Subject: [powernet] Histogram Archival Questions TVA External Message. Please use caution when opening. Histogram Archival Questions: 1. Are event related histograms printed and archived with other event documents? 2. Are non-event related histograms (e.g. anticipated dose rate alarms, invalid alarms) archived? a. If no, how long are they retained after review? b. If yes, how long are they retained? c. If yes, what format is used for storage? 3. Have you ever had the need or a request for a non-event related histogram? Thanks, Kathy L Jonas Sr. Scientist Radiation Dosimetry & Records Fleet Scientific Services Duke Energy (980) 875-3946
