Duke Energy's SRD Alarm fleet procedure definitions:
Expected Dose Rate Alarm: A planned intermittent or momentary dose rate alarm resulting from anticipated dose rates encountered in the travel path to the work area or anticipated transient work area dose rates. * Expected dose rate alarms are communicated to the worker and documented prior to RCA entry to commence work. * If the worker is NOT made aware of an expected dose rate alarm prior to receiving the alarm, the dose rate alarm CANNOT be considered an expected alarm. Invalid Dose or Dose Rate Alarm: Any dosimetry alarm NOT caused by radiation with the exception of exposure to X-ray scanning machines. Invalid alarms can be attributed to one or more of the following: * SRD malfunction causing instantaneous spike and alarm worker does NOT hear. These dose rate alarms are typically discovered on log out. * Dose rate alarm or dose alarm occurs when SRD is dropped or jarred. * Dose rate alarm or dose alarm occurs due to RF or magnetic interference caused by close proximity to welding equipment or other energized components. * Exposure to an X-ray scanning device, i.e., airport luggage scanner or security material scanning machine Unexpected Dose Rate Alarm: Any valid dose rate alarm that is NOT anticipated and communicated to the worker and documented prior to RCA entry to commence work. Valid Dose or Dose Rate Alarm: Any dosimetry alarm caused by radiation, with the exception of exposure to X-ray scanning machines, is considered a valid alarm. Christopher C. Courtenay, P.E. Duke Energy Senior Nuclear Engineer * Fleet Scientific Services RP Technical Staff 526 S. Church St. Charlotte, NC 28202 * Mail Code: EC07F 980-373-1894 "To the optimist, the glass is half full. To the pessimist, the glass is half empty. To the engineer, the glass is twice as big as it needs to be." From: Powernet [mailto:[email protected]] On Behalf Of Hood, Eric via Powernet Sent: Wednesday, July 25, 2018 12:55 PM To: '[email protected]' <[email protected]> Cc: Hood, Eric <[email protected]> Subject: [Powernet] Anticipated vs Unanticipated Dose Rate Alarm *** Exercise caution. This is an EXTERNAL email. DO NOT open attachments or click links from unknown senders or unexpected email. *** Can anyone give me a good definition for Anticipated vs Unanticipated Dose Rate Alarms? We have no specific definition, which leaves things vague on what to call a dose rate alarm when it occurs. I would think that an anticipated alarm would be one that was specifically expected to come in (and briefed/logged as such) and then go out due to a known hotter area in something like a transit path. [STP Logo] Eric G. Hood Staff Health Physicist - ALARA (361)972-7928
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