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Category:Letter type:RA
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2010-07-28
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Text
C Maine Yankee 321 OLD FERRY RD.
- WISCASSET, ME 04578-4922 January 26, 2005 MN-05-002 RA-05-003 UNITED STATES NUCLEAR REGULATORY COMMISSION Attention: Document Control Desk Washington, DC 20555
References:
- 1) License No. DPR-36 (Docket No. 50-309)
- 2) Maine Yankee Letter to the USNRC, MN-02-048, dated October 15, 2002, "Revision 3, Maine Yankee's License Termination Plan"
- 3) USNRC Letter to Maine Yankee, dated February 28, 2003, Issuance of Amendment No. 168 To Facility Operating License No. DPR-36
Subject:
Technical Basis Document forNRC Review: Exploranium GR-130 minimum Detectable Concentration (MDC) of Cs-137 and Co-60 in Surface Soil - 30 Day Notice per LTP Requirement The Maine Yankee License Termination Plan (LTP), Revision 3 (Reference 2) was incorporated into the Maine Yankee License on February 28, 2003 (Reference 3). LTP Section 5.5.1, "Survey Measurement Methods" stated:
Fiinal site survey mneasurentents include surface scans, direct stuface measurements, and gamma spectroscopy of volumnetric materials. In situt gamma spectroscopy or other methods not specifically described mnay also be usedforfinal statissurveys. Ifso, Maine Yankee vill give the NRC 30 days notice to provide an opportunity to review the associatedbasis docutnment as describedin LTP Section 5.3. 1.'
In accordance with the above 30 day notice requirement, Maine Yankee has prepared a Technical Basis Document (TBD) for the limited use of the Exploranium GR-130 instrument. This TBD consists of the attached Engineering Calculation (EC) 004-04 "Exploranium GR-130 Minimum Detectable Concentration (MDC) of Cs-137 and Co-60 in Surface Soil."
The Exploranium GR-130 MiniSPEC (GR-130) is a portable, battery powered, hand held instrument with an internal 4.5 cubic inch Nal (TI) gamma scintillator probe and a 256-channel pulse height analyzer. The TBD describes the use of the GR-130 to quantitatively investigate scan alarms to determine whether the alarm is related to plant derived activity in surface soils to a depth of 15cm.
I The reference to section 5.3.1 in the LTP was a typographical error. It should have referenced section 5.5.2.a.
p mssaIS
UNITED STATES NUCLEAR REGULATORY COMMISSION Attention: Document Control Desk Page 2 of 2 Maine Yankee's quantitative reliance on the use of the GR-130 instrument for Final Status Survey (FSS) measurements was limited to the conduct of investigations in one survey unit, FR-0220 Spare Transformer Pad Footprint. The survey information for this survey unit is scheduled to be submitted to the NRC along with FSS Final Report No. 9 on March 9,2005.
The Technical Basis Document concludes that the GR-130 can easily detect Cs-137 activity at or below the soil DCGL's (typically 2.39 pCi/g). The TBD also concludes that the MDC values for Co-60 are typically greater than the DCGL's (typically 0.86 pCi/g) for the nominal count times used. However, for the only instance where Maine Yankee quantitatively relied on the use of the GR-I 30 instrument for FSS measurements, the Co-60 MDC value was less than the soil DCGL.
FR-0220 Spare Transformer Pad Footprint consisted of one Class 3 survey unit inside the Industrial Area (IA) but outside the Restricted Area (RA); therefore the Co-60 soil DCGL was 1.52 pCi/g.
Furthermore, the GR-130 instrument was only used to quantitatively investigate scan alarms. In this application, 30 minute count times were used. The Co-60 MDC was estimated to be 1.16 pCi/g for 30 minute count times. Thus, Maine Yankee's use of the GR-130 is appropriate on a limited basis.
If you have any questions concerning this submittal, please contact Mike Whitney at Maine Yankee, (207) 721-9137.
Sincerely, Michael J. Meisner Vice President and Chief Nuclear Officer Attachment Engineering Calculation No. 004-04 (MY) Exploranium GR-130 Minimum Detectable Concentration (MDC) of Cs-137 and Co-60 in Surface Soil.
cc: Dr. R. R. Bellamy, NRC Region I Mr. C. Pray, State of Maine, Nuclear Safety Advisor Mr. P. J. Dostie, State of Maine, Division of Health Engineering Mr. D. Gillen, NRC Acting Director, Division of Waste Management Mr. S. J. Collins, NRC Regional Administrator, Region I Mr. J. Buckley, NRC NMSS Project Manager, Decommissioning Mr. M. Roberts, NRC Region I Mr. R. Shadis, Friends of the Coast