Number 1 would be an Human performance issue
Number 2 - currently no, but based on a recent evaluation, Exelon is in the process of evaluation of a band. We are currently looking at 25% above. So in the example cited, if the dose rate exceeded the expected band by 25%, then additional actions may be required. Willie Harris, CHP RRPT Director, Radiation Protection 200 Exelon Way Kennett Square, PA 19348 Office Phone: 610.765.5350 Cell: 484-885-0578 [email protected] From: [email protected] [mailto:[email protected]] On Behalf Of ROSSER, FREDERICK W Sent: Thursday, April 25, 2013 11:00 AM To: [email protected] Subject: Powernet: RE: Unanticipated Dose Rate Alarm Metric (KPI) Grand Gulf Nuclear Station reply 1.This would be classified as a human performance error and treated as such. We would document a condition report to document the circumstances but we would not count it for the PI. Documentation would be used when the NRC or others look at the alarm report. 2. We do not use a band. If the alarm is set at 100 and they get to 100.1, it's a valid alarm. Fred Rosser Radiation Protection Supervisor Grand Gulf Nuclear Station 601 437-6571 From: [email protected] [mailto:[email protected]] On Behalf Of Johnson, Graham T Sent: Thursday, April 25, 2013 6:23 AM To: [email protected] Subject: Powernet: Unanticipated Dose Rate Alarm Metric (KPI) Duke Energy would appreciate answers to the following questions regarding counting dose rate alarms as anticipated or unanticipated in your site metrics. 1) Scenario: An employee is briefed to expect a dose a rates of between 75 -150 mR/hr in route to a work area. The RWP/Task dose rate alarm setpoint is 75 mR/hr and the employee is briefed to anticipate a dose rate alarm. The employee logs onto the wrong RWP Task and receives a dose rate alarm at 12 mR/hr because he is on the wrong task. The actual dose rates encountered were as briefed. Would you count this as an unanticipated dose rate alarm? 2) Does your site have an acceptance band for variations in briefed dose rate alarms versus actual dose rates encountered and if so, what is the band? For example, if a worker is briefed to receive an anticipated a dose rate alarm of 100 mR/hr, is there a range above 100 that would be acceptable and then a point at which alarm would be called unanticipated? (e.g., if the band was +/- 25%, then 120 mR/hr would be an anticipated alarm but 130 mR/hr would be called an unanticipated alarm.) Thanks, Graham Johnson, CHP Supervising Scientist General Office Radiation Protection Duke Energy 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
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