Hi,
Diablo Canyon’s response below:
First of all, we are a PWR. We do not have issues with radiation exposure
outside our RCA.
1) Yes we allow TLDs to go home, although we are evaluating that decision at
this time.
2) We use a vendor for processing. The majority of our TLDs are worn by the
worker and removed from site. For these we use a blended, calculated control
value for each element. The values were calculated using a blended daily
contribution for our site background and an average daily contribution from
offsite. Our site numbers are well known, stable and understood. Our off site
numbers vary greatly depending on where a person lives. We use an average of
that data. We used a limited study of our new TLDs and our Environmental TLD
data to determine the offsite average. We have a much larger background study
in progress now. I suspect it will continue to show the wide variability
across our offsite area.
Neutron TLDs and ISFSI TLDs remain on site and our site controls are used for
these TLDs.
3) Because of the difficulties associated with background, it’s very important
to scan for false positives (people who didn’t go in the RCA or got no
estimated dose and TLD is above LLD) and false negatives (people who got
estimated dose above a threshold and the TLD is below LLD). In the example
given, we would write an evaluation where the estimated dose (none) and DLR are
reviewed. In this instance, an official dose of less than LLD would be
assigned because no RCA entries were made.
Thanks,
Linda
Linda M. Sewell, CHP
Principal Health Physicist
Pacific Gas & Electric Company
Diablo Canyon Power Plant
MS 119/1/117
PO Box 56
Avila Beach, CA 93424
P: 805.545.4315 | F: 805.545.2618| [email protected]<mailto:[email protected]>
From: [email protected] [mailto:[email protected]] On Behalf Of
Baca, Michelle A
Sent: Tuesday, October 14, 2014 10:52 AM
To: [email protected]
Subject: Powernet: Assigning Dose for Individuals and Background Subtraction
Good afternoon,
PSEG would like to know:
1. Does your site allow DLRs to be taken home?
2. How is background subtracted – does your site use controls or something
else?
3. How does your site assign dose recorded on DLRs for individuals that
did not enter an RCA (such as personnel issued DLRs for E-plan response) during
the monitoring period?
Thank you in advance for your time and consideration,
Michelle
Michelle Baca
PSEG Nuclear, LLC
Radiation Protection
856.339.1049
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