Response for Robinson - Had to find the time for you Seth. You get the award
for doing the best job of providing responses so I thought I had better give
you one back!!!
From: [email protected] [mailto:[email protected]] On Behalf Of
[email protected]
Sent: Thursday, September 09, 2010 5:15 PM
To: [email protected]
Cc: [email protected]
Subject: Powernet: Alpha Monitoring
Palo Verde requests some information pertaining to alpha monitoring at other
stations:
Do you currently have alpha contamination at your plant? Yes
If so
What is your average or typical Beta/Gamma to Alpha ratios? e.g., > 1000, 100
to 1000, < 100 Conservatively assume most areas to be Level II (< 30,000:1
beta-gamma to alpha)
What is the lowest Beta/Gamma to Alpha ratio that you have seen? ~100:1
If you have alpha contamination areas with ratios < 50:1 do you require that
all items removed from the area have a direct frisk with an alpha contamination
instrument? We have not had these levels and do not require alpha frisking
What instrument do you use to direct alpha frisking? N/A
What is the RDA for the instrument? N/A
What instrument do you use to count smears for alpha? Ludlum Model 2000 and
Model 2241
For smears counted in a scalar, do you have an upper limit on activity levels
to prevent cross- contamination or cross-talk? Not currently but we probably
need one. We typically have an upper limit of < 100 mrad/hr due to
ALARA/practical considerations.
Do you have a specific posting for areas that contain alpha contamination?
Level III areas must be behind a second SOP and posted so as to provide workers
with entry requirements ("Contact HP Prior to Entry")
At what level do you post these areas? e. g., > 20 dpm/100 cm2 Level III, <
300:1 beta-gamma to alpha
Do you perform routine in-vitro analysis for personnel working in alpha
contamination areas or only when there are indications that that a potential
intake has occurred? In-vitro is only considered when there are indications
that a potential intake has occurred.
**********************************************************************
Seth J. Kanter, CHP, RPT
Sr. Health Physicist
Palo Verde Nuclear Generating Station
Mail Sta. 7397
5801 S. Wintersburg Rd.
Tonopah, AZ 85354
Phone (623) 393-3130
Fax (623) 393-2487
Unless otherwise noted, all opinions are my own
Liviu Librescu
**********************************************************************
Email Firewall made the following annotations
---------------------------------------------------------------------
--- NOTICE ---
This message is for the designated recipient only and may contain confidential,
privileged or proprietary information. If you have received it in error, please
notify the sender immediately and delete the original and any copy or printout.
Unintended recipients are prohibited from making any other use of this e-mail.
Although we have taken reasonable precautions to ensure no viruses are present
in this e-mail, we accept no liability for any loss or damage arising from the
use of this e-mail or attachments, or for any delay or errors or omissions in
the contents which result from e-mail transmission.
---------------------------------------------------------------------
