Hi,
Diablo Canyon's response
We do entrance and exit whole body counts.
We do perform in-vitro tritium bioassay for all SFP diving activities.
In addition to engineering controls and/or respirators we do require lapel air
samplers for work in Alpha level 3. In a sense, I think these are functioning
as that first level of "bioassay" for this type of work. Further bioassay
requirements, if any, are based on lapel air sampling results. In addition,
off normal events may also trigger bioassay requirements.
Happy Friday All,
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
Holmes, Stephen J
Sent: Friday, March 30, 2012 10:49 AM
To: [email protected]
Subject: Powernet: Baseline Bioassay Sampling
I am looking at industry best practices for performing baseline and routine
bioassay (in-vivo and in-vitro).
At Ginna we do not do baseline or routine/confirmatory WBCs, we take credit for
our passive monitors (portal monitors) which are set to alarm at <1% ALI of the
station DAW mixture.
We do have provisions in our procedures for performing in-vitro tritium
bioassay prior to and after SFP diving activities.
We do not currently have guidance in our procedures for performing baseline or
routine bioassay for workers who work in Alpha Level 3 / TRU areas. We do not
often work in Alpha Level 3, but we do have a few areas that are characterized
as such.
I do not know of any requirement to perform baseline or confirmatory in-vitro
bioassay for workers potentially exposed to Alpha contamination. However,
without performing in-vitro monitoring, the only thing we have to back up our
Alpha contamination controls are job coverage surveys and air samples.
How do our practices line up with the rest of the industry?
Thanks,
-Steve
Stephen J Holmes, PE
Sr. Plant Health Physicist, CENG-RE Ginna NPP
[email protected]<mailto:[email protected]>
585-771-3577; 585-545-1661 (cell)
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