The dosimeter will momentarily over respond if the dose rate abruptly increases.
Angular dependence over response can be dramatic under the right conditions. Both of these conditions rarely occur. If you are getting multiple alarms in different areas, these are probably not the cause. We did once have a configuration issue caused by an access control software change - the cal factor was being changed for a certain dosimeter firmware version. To rule things like this out, I would check the suspect dosimeters in a known radiation field. For example, we check dosimeters on a phantom using a free in air irradiation. John Lebda Staff RP Specialist Beaver Valley Power Station 724-682-7775 From: "Barnhill, Carlette" <[email protected]> To: "[email protected]" <[email protected]> Date: 04/02/2014 11:38 AM Subject: Powernet: Invalid EPD Dose Rate Alarms Sent by: [email protected] Duke Energy Progress-Brunswick site is experiencing a higher than usual occurrence of invalid EPD dose rate alarms, using the DMC2000. Other than the human performance factor (dropping, bumping etc), does anyone have any information concerning any configuration/ operational issues with the EPD proper that may be a contributor to spurious rate alarms? Thank you for your time Carlette Barnhill Duke Energy Progress Southport NC ----------------------------------------- The information contained in this message is intended only for the personal and confidential use of the recipient(s) named above. If the reader of this message is not the intended recipient or an agent responsible for delivering it to the intended recipient, you are hereby notified that you have received this document in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify us immediately, and delete the original message.
