North Anna recently had a DMC-3000 that went to a "blank screen" while worn by a worker in the RCA. It did not turn off - just completely died and could not be turned on again after replacing the battery. Mirion has sent that dosimeter to France for additional testing. We may be the "another Mirion utility customer had same issue" :)
Mirion was onsite the other week and has identified over 150 DMC-3000s that will require repairs. We are working on the vendor in getting these shipped to them. Barbara J. Thompson North Anna Power Station 1022 Haley Drive Mineral, Va 23117 Superintendent Health Physics Technical Services bj.thomp...@dominionenergy.com Phone: 540-894-2638 From: Powernet [mailto:powernet-boun...@hpspowernet.org] On Behalf Of LaFrate, Patrick Joseph via Powernet Sent: Thursday, November 01, 2018 1:24 PM To: powernet@hpspowernet.org Cc: LaFrate, Patrick Joseph Subject: [External] Re: [Powernet] Quick Benchmarking on ED's Duke Energy has been transitioning to DMC3000s from DMC2000s since 2015. Currently four out of seven duke sites are using DMC3000s as their primary WB SRD and continue to use DMC2000s (version 3 and 4) as area monitors or in their E-Kits. We plan to get 2 out of our remaining 3 sites on DMC3000s by the end of 2020. CR3 is currently not in our plans to upgrade (presently in safe mode). We too are experiencing battery consumption problems with our DMC3000s. Not only have we been experiencing battery consumption problems but have had (2) DMC3000s go completely dead in the RCA without warning. Below is a list of what we've been experiencing: 1. Duke has purchased ~5000 DMC3000s since 2015. 2. There have been 3 versions of the dosimeter. 3. Version 1 - manufactured from 2011 to 2015 were made with (4) "super" capacitors (supercaps). 4. Version 2 - (Rev B board) manufactured from mid-2015 to October 2017 were made with (2) supercaps. These are susceptible of going blank in the field without warning. They have a high current draw. 5. Duke's inventory are version 2 models (>95% of inventory). 6. Version 3 - manufactured after October 2017 are not susceptible. 7. Mirion Customer Notification out. If anyone would like a copy I can send you one. 8. Two test equipment sets (test box and multi-meter) was provided to Duke by Mirion. We should be getting a few more in the coming weeks. 9. Plan is to repair any DMC3000 that test with >225 µA of current draw. 10. Duke was the only US plant that have exhibited this phenomenon (turn off in RCA without warning) but another Mirion utility customer had same issue. 1. Currently Mirion has been sent over 200 DMC3000s for repair. We were told it would take about a two week turn around to get them fixed. 2. We have not received any back yet. 3. So far, only one of our sites using DMC3000s has tested their entire inventory. 14. The Duke Energy Dosimetry Lab's new, never been used, inventory has been checked and we are seeing about a 40% failure rate but the failure rate seems to be increasing as we check the newer 3000s just received. Patrick J. LaFrate, CHP Manager - Radiation Dosimetry & Records Duke Energy Dosimetry Laboratory 13339 Hagers Ferry Road Applied Science Center; Bldg 7405 MC: MG03A2 Huntersville, NC 28078 980-875-3204 919-802-5716 (cell) From: Powernet [mailto:powernet-boun...@hpspowernet.org] On Behalf Of Rolph, James Thomas Jr via Powernet Sent: Thursday, November 01, 2018 5:09 AM To: 'powernet@hpspowernet.org' Cc: Rolph, James Thomas Jr Subject: Re: [Powernet] Quick Benchmarking on ED's *** Exercise caution. This is an EXTERNAL email. DO NOT open attachments or click links from unknown senders or unexpected email. *** Within TVA we are currently using both the DMC-2000S and DMC-3000 electronic dosimeters. We have been transitioning over to the DMC-3000 as the DMC-2000S dosimeters fail. The average life of our DMC-2000S population is 10 years. We expected to be fully transition over to DMC-3000s within 2-3 years, with the remaining DMC-2000S population being used to monitor plant conditions and possibly replacing quartz fiber dosimeters in our e-kits. On a side note, we have 171 of the DMC-3000 electronic dosimeters that are of the type B run that was recently identified as having a potential battery consumption issue. We completed testing of 52 of these dosimeters yesterday and had 10 that failed the Mirion test procedure. I don't know what others are seeing, but I thought this was an opportunity to share that information. We expect to finish testing that population over the next couple of days, and then returning the ones that failed back to Mirion for further testing and correction of the issue. Take cae, Jim From: Powernet [mailto:powernet-boun...@hpspowernet.org] On Behalf Of Kinmark, Michael L. via Powernet Sent: Wednesday, October 31, 2018 2:20 PM To: powernet@hpspowernet.org<mailto:powernet@hpspowernet.org> Cc: Kinmark, Michael L. Subject: [Powernet] Quick Benchmarking on ED's TVA External Message. Please use caution when opening. Question from Columbia on Electronic Dosimeter make/model Which ED model are you currently using? DMC-3000?, DMC-2000S?, Or other? Plans to change in the future? Columbia: Currently using DMC-2000S. Tentative plans to change over to 3000 in 2 years. Sincerely, Michael Kinmark HP Staff Advisor III Radiological Support Columbia Generating Station 509-377-2091 mlkinm...@energy-northwest.com<mailto:mlkinm...@energy-northwest.com> CONFIDENTIALITY NOTICE: This electronic message contains information which may be legally confidential and or privileged and does not in any case represent a firm ENERGY COMMODITY bid or offer relating thereto which binds the sender without an additional express written confirmation to that effect. The information is intended solely for the individual or entity named above and access by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution, or use of the contents of this information is prohibited and may be unlawful. If you have received this electronic transmission in error, please reply immediately to the sender that you have received the message in error, and delete it. Thank you.
_______________________________________________ Powernet mailing list Powernet@hpspowernet.org http://hpspowernet.org/mailman/listinfo/powernet_hpspowernet.org
