ML051050492
| ML051050492 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 02/25/2005 |
| From: | Bauer T Oak Ridge Institute for Science & Education |
| To: | Buckley J NRC/NMSS/DWM |
| References | |
| 04-003, 05-006 | |
| Download: ML051050492 (7) | |
Text
O R f S E Distribution approval and concurrence:
Technical Management Team Member Laboratory Manager Quality Manager C C E 1 4 E 0 171 O A K R I D G E INSTITUTE F O R S C I E N C E AND E D U C A T I O N
- 1.
m c L?-Tp February 25,2005 Mr. John Buckley Mail Stop: 7F27 Division of Waste Management US. Nuclear Regulatory Commission Two White Flint North 1 1545 Rockville Pike Rochlle, MD 20852-2738
SUBJECT:
FINAL-CONFIRMATORY SURVEY RESULTS FOR SURFACE SOIL SURVEY UNITS 9 AND 10, MAINE YANKEE ATOMIC POWER COMPANY, WISCASSET, MAINE [DOCKET NO. 50-0309; RFTA NOS.04-003 AND OS-0061
Dear Mr. Buckley:
The Environmental and Survey Site Assessment Program (ESSAP) of the Oak Ridge Institute for Science and Education (ORISE) performed confirmatory surveys of survey units 9 and 10 of the Maine Yankee Atomic Power Companys (MYAPC) final status survey package FR 01 1 1 during the periods of November 15 and 16, 2004, and December 7 and 8,2004. Enclosed are the subject final confirmatory survey results with your comments incorporated. These results will be incorporated into the final confirmatory survey report with the results of the planned March 2005 MYAPC soil areas survey outlined in RFTA No.05-006.
Please direct any questions you may have to me at (865) 576-3356 or Timothy J. Vitkus at (865) 576-5073.
Sincerely, Timothy J.-Bauer Health Physicist Environmental Survey and Site Assessment Program TJB : ar Enclosure P. 0. BOX 117, OAK RIDGE, TENNESSEE 37831-01 17 Managed and operated by Oak Ridge Associated Universities for the US. Deportment of Energy
CONFIRMATORY SURVEY RESULTS FOR SOIL SURVEY UNITS 9 AND 10 MAINE YANKEE ATOMIC POWER COMPANY WISCASSET, MAINE INTRODUCTION The U.S. Nuclear Regulatory Commissions (NRC) Headquarters and Region I Offices requested that the Oak Ridge Institute for Science and Educations (ORISE) Environmental and Survey Site Assessment Program (ESSAP) perform confirmatory surveys of excavated soil survey units (SU) 9 and 10 at the Maine Yankee Atomic Power Company (MYAPC) in Wiscasset, Maine.
SU 9 of final status survey (FSS) package FR 01 1 1 is centered along the west boundary of the Restricted Area. The area of SU 9 is 1,622 m2, extending from the north end of FR 01 11 SU 6 up to the south end of FR 01 1 1 SU 8, and located between outfall six and the Restricted Area roadway. The confirmatory survey of SU 9 was performed on November 15 and 16,2004. The area of SU 10 fiom FSS package FR 01 11 is 1,332 m2, extending fiom the north end of FR 0100 SU 1 up to the south end of FR 01 11 SU 11, and bounded on the east side by FR 01 11 SU 9 and by FR 0 1 1 1 SU 13 on the west side. The confirmatory survey of SU 10 was performed on December 7 and 8,2004.
PROCEDURES The confirmatory surveys were performed in accordance with the site-specific survey plans, submitted to and approved by the NRC (ORISE 2004a and b), and the ORISEESSAP Survey Procedures and Quality Assurance Manuals (ORISE 2004c and d). Gamma surface scans were performed over 100 percent of accessible portions of the survey units using NaI scintillation detectors coupled to ratemeters with audible indicators-some areas were inaccessible due to standing water or restricted access due to safety concerns. Seven soil samples (0-15 cm) were collected from excavated areas of SU 9 (Figure 1) and six soil samples were collected from excavated areas of SU 10 (Figure 2).
SAMPLE ANALYSIS AND DATA INTERPRETATION Samples and data were returned to ESSAPs laboratory in Oak Ridge, TN for analysis and interpretation. Soil samples were analyzed by gamma spectroscopy for the primary gamma emitting radionuclide of concern C s - 1 3 7 4 e data were also reviewed for other fission and activation products, e.g. CO-60. Sample analyses were performed in accordance with the ESSAP Laboratory Procedures Manual (ORISE 2004e). Radionuclide concentrations were reported in picocuries per gram (pC;/g). The analytical results were compared to MYAPCs site-specific derived concentration guideline level (DCGLw) for Cs-137 of 2.39 pCi/g (MYAPC 2002).
FINDINGS AND RESULTS Gamma surface scans identified several locations of elevated direct gamma radiation in SU 9, but determined the elevated readings were due to natural radioactive material in granite formations. No elevated areas were identified during gamma surface scans of SU 10.
Concentrations of radionuclides in soil samples collected from SU 9 and 10 are provided in MYAPC Soil Survey Units 9 and 10 projectdl 643/200542-25 Final Reportdoc
Table 1. Concentrations of Cs-137 in SU 9 ranged from -0.03 to 0.56 pCi/g. Concentrations of Cs-137 in SU 10 ranged from 0.00 to 0.06 pCi/g. A review of other gamma-emitting radionuclide concentrations did not note any significant findings.
COMPARISON OF RESULTS WITH GUIDELINES A comparison of Cs-137 radionuclide concentrations to the site-specific DCGLw showed that the concentrations are below the guideline. Based on these results, it is ESSAPs opinion that SU 9 and 10 satisfy the site-specific DCGLw of 2.39 pCi/g.
MYAPC Soil Survey Units 9 and 10 2
projectdl 643/2005-02-25 Final Report.doc
1637-002 (2)
M EASU REM ENT/SAM PLI NG LO CAT1 0 NS 1 # SOIL FROM EXCAVATED AREAS 5
NOT TO SCALE I
FIGURE 1: Survey Unit 9 - Measurement and Sampling Locations I
MYAPC Soil Survey Units 9 and 10 3
pro~ects/I643i?00542-25 Final Report.doc
1643-001 (1) 6 5
MEASUREMENT/SAMPLING LOCATIONS
- SOIL FROM EXCAVATED AREAS INACCESSIBLE AREA N
FEET 0
'METERS
- m FIGURE 2: Survey Unit 10 - Measurement and Sampling Locations projectsil6431200j-02-2j Final Repol-[.doc MYAPC Soil Survey Units 9 and 10 4
TABLE 1 CS-137 CONCENTRATIONS IN SOIL DETERMINED BY GAMMA SPECTROSCOPY SU 9 AND 10 MAINE YANKEE ATOMIC POWER COMPANY WISCASSET, MAINE Survey Unit 9 d
1637S0001
-0.03 f 0.03' 1637S0002 0.56 f 0.05 0.23 1637S0003 0.02 f 0.03 0.01 1637S0004 0.05 k 0.02 0.02 1637S0005 0.02 k 0.02 0.01 1637S0006 0.04 k 0.02 0.02 1637S0007 0.04 k 0.03 0.02 Survev Unit 10 164330001 1
0.06 f 0.03 I
0.03 164330002 I 0.ooe f 0.01 I
0.00 1643S0003 I
0.02 k 0.02 I
0.01 1643S0004 I 0.02 f 0.02 I
0.01 1643S0005 I 0.00 f 0.02 I
0.00
'Refer to Figures 1 and 2.
Calculated by dividmg the Cs-137 concentration by the DCGLw of 2.39 pCi/g.
Wncertainties represent the 95% confidence level based on total propagated uncertainties.
dNot applicable.
eZero values due to rounding.
b MYAPC Soil Survey Units 9 and 10 5
projectdl 643/200542-25 Final Report.doc
REFERENCES Maine Yankee Atomic Power Company (MYAPC). Maine Yankee License Termination Plan, Revision 3. Wiscasset, Maine. October 2002.
Oak Ridge Institute for Science and Education (ORISE). Final Confirmatory Survey Plan for Surface Soil Survey Unit 9, Maine Yankee Atomic Power Company, Wiscasset, Maine [Docket No. 50-0309; RFTA No. 04-0031. Oak Ridge, TN; November 11,2004a.
Oak Ridge Institute for Science and Education. Final Confirmatory Survey Plan for Surface Soil Survey Unit 10, Maine Yankee Atomic Power Company, Wiscasset, Maine [Docket No. 50-0309; RFTA No. 05-0061. Oak Ridge, TN; December 3,2004b.
Oak Ridge Institute for Science and Education. Survey Procedures Manual for the Environmental Survey and Site Assessment Program. Oak Ridge, TN; September 2,2004~.
Oak Ridge Institute for Science and Education. Quality Assurance Manual for the Environmental Survey and Site Assessment Program. Oak Ridge, TN; August 3 1,2004d.
Oak Ridge Institute for Science and Education. Laboratory Procedures Manual for the Environmental Survey and Site Assessment Program. Oak Ridge, TN; August 3 1,2004e.
MYAPC Soil Survey Units 9 and 10 6
projectdl 643/2005-02-25 Final Report.doc