We've found the same short-lived activation during ISFSI measurements during the Helium drying process (~24hr). Alumunium often has Mn as an alloy and Mn-56 is a high yield.
Glen Vickers Exelon Corp RP Technical Lead, CHP 815-216-2723 (work/cell) From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Friday, July 25, 2014 6:23 PM To: [email protected] Subject: RE: Powernet: Use of neutron DMC 2000 GN Palo Verde uses the DMC2000GN with different calibration factors for ISFSI and power entries. We use them with Sentinel. I accidentally neutron activated a small batch of DMC2000GNs once, while testing them in a higher energy neutron field during a power entry. It took a few days for them to clear the SAM. Heather Jackson, CHP, RRPT Sr. Health Physicist Palo Verde Nuclear Power Plant 623-393-6076 From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Vickers, Glen:(GenCo-Nuc) Sent: Wednesday, June 25, 2014 4:02 AM To: [email protected]<mailto:[email protected]> Cc: Neil A Szuch; Timothy J Edgar; John E Oetken Subject: RE: Powernet: Use of neutron DMC 2000 GN We use Sentinel v.1.11.02. Was able to make a test entry without an issue. The key thing is to do a direct measurement with the EDs and passive dosimeters and phantom to determine the right CF. The neutron-gamma conversion material is similar to that of the Siemens dosimeter and will be energy dependent. We use the Holtec system and the duration with the cask nearly full of water between decon and welding is short and neutron dose rates are so low (<1 mrem/hr remball), we couldn't get positive results on our passive dosimeters. This also means you occupational exposure from neutron is not significant. We were able to get enough duration and slightly higher neutron rates (2-3 mrem/hr remball) during the helium drying phase to get a positive result. I'd expect this phase with helium is where the factor would be generated as this is the phase during drying and insertion into the transport cask where most occupational exposure will be received. We have a couple sites that have recently bought some DMC2000GN units and will be looking to do this test. Glen Vickers Exelon Corp RP Technical Lead, CHP 815-216-2723 (work/cell) From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Bradley A Krupp Sent: Friday, June 13, 2014 9:52 AM To: powernet Cc: Neil A Szuch; Timothy J Edgar; John E Oetken Subject: Powernet: Use of neutron DMC 2000 GN Fermi would like feedback from peers on there use of the DMC 2000 GN for neutron monitoring. Do you use it with sentinel? If so what version. We are using version 1.08.04. How do you use it in your neutron dose tracking program. Have you used it with any ISFSI campaign. Any other information that may be helpful. Thank in advance for your assistance. Brad Krupp Sent from my iPad 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 --- NOTICE --- This message is for the designated recipient only and may contain confidential, privileged or proprietary information. If you have received it in error, please notify the sender immediately and delete the original and any copy or printout. Unintended recipients are prohibited from making any other use of this e-mail. Although we have taken reasonable precautions to ensure no viruses are present in this e-mail, we accept no liability for any loss or damage arising from the use of this e-mail or attachments, or for any delay or errors or omissions in the contents which result from e-mail transmission.
