Fermi - we use Canberra / Tennelec 5XLB counter for analyzing smears for
free release surveys.
Benjy Bertossi
Fermi2 - RP Supervisor
734-586-4935
bertos...@dteenergy.com
From: "Lee, Sun G." <sg...@firstenergycorp.com>
To: "powernet@hps1.org" <powernet@hps1.org>
Cc: "Trickett, Stephen M" <strick...@firstenergycorp.com>, "Lee,
Sun G." <sg...@firstenergycorp.com>
Date: 01/26/2015 12:46 PM
Subject: Powernet: Powernet questionnaire on unconditional release
Sent by: owner-power...@hps1.org
Perry Nuclear Power Plant would like to know:
Our Station Procedures allow unconditional release of items from the RCA
using a frisker to check for contamination on a smear. What is the
conditional release limit for removable contamination, at your station?
References:
Using a frisker and rate meter to check for contamination on a smear cannot
reliably detect this level of contamination. In addition;
1. The industry standard is to assess the activity on a smear using an
instrument of known efficiency. This is common in the nuclear power
industry for unconditional release. The requirement also exists in
radioactive material licenses issued by Agreement States and the NRC. The
determination of an efficiency requires a scaler and detector calibrated
with an NIST traceable standard. Friskers are not calibrated to determine
an efficiency using an NIST traceable source.
2. INPO 05-008 states that the best available technology should be used for
unconditional release practices. Smear counters are readily available and
provide better detection capability, i.e. a lower MDA, than a frisker with
a rate meter.
3. ANI Inspection Criteria 8.7.7.5 states that defined detection levels
should be established for unconditional release and the levels should be
based on the minimum detection capabilities of the instrumentation being
used for unconditional release. The current procedural requirement of no
increase above background using a frisker is not a defined detection level.
Instrumentation is available that can detect removable contamination below
200 dpm/100 cm2 but it is not currently required to be used.
Question: Do you use a Tennelec, or similar counter, for meeting release
criteria?
Thank you.
Sun Lee
440-465-8030 cell
440-280-5039 work
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