Yes.
Sent from my iPhone
On Jan 26, 2015, at 12:46 PM, Lee, Sun G.
sg...@firstenergycorp.commailto:sg...@firstenergycorp.com wrote:
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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