ML053560182
| ML053560182 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 11/17/2005 |
| From: | Adams W Oak Ridge Institute for Science & Education |
| To: | James Shepherd NRC/NMSS/DWM |
| References | |
| RFTA 05-012 | |
| Download: ML053560182 (7) | |
Text
F1R I S HE OAK RIDGE INSTITUTE FOR SCIENCE AND EDUCATICON November 17, 2005 Mr. James Shepherd Division of Decommissioning/Waste Management U.S. Nuclear Regulatory Commission Two White Flint North, Mail Stop: 7F27 11545 Rockville Pike Rockville, MD 20852-2738
SUBJECT:
REVISED-IN-PROCESS INSPECTION SURVEY RESULTS FOR THE TURBINE BUILDING EXCAVATION AT THE BIG ROCK POINT RESTORATION PROJECT, CHARLEVOIX, MICHIGAN (DOCKET NO.
50-0155, RFTA NO.05-012)
Dear Mr. Shepherd:
The Environmental Survey and Site Assessment Program (ESSAP) of the Oak Ridge Institute for Science and Education (ORISE) performed in-process inspection survey activities at the Turbine Building (TB) excavation at the Big Rock Point Restoration Project in Charlevoix, Michigan on September 20, 2005. These survey activities were requested and approved by the U.S. Nuclear Regulatory Commission (NRC). The survey activities included gamma surface scans and soil sampling. This letter report has been revised to clarify that the interlaboratory comparison samples were not part of the confirmatory activities of the TB excavation but were analyzed to fully assess the radioanalytical quality of the licensee's contractor laboratory. Enclosed are the in-process survey results documenting these survey activities.
If you have any questions or comments, please direct them to me at (865) 576-0065 or Scott Kirk at (865) 574-0685.
Sincerely, WJOC.4QV-Wade C. Adams Health Physicist/Project Leader Environmental Survey and Site Assessment Program WCA:ar Enclosure cc: T. McLaughlin, NRC/NMSS[TWFN T-7E18 B. Watson, NRC/NMSS/TWFN T-7E18 E. Knox-Davin, NRC/NMSS/TWFN 8A23 S. Kirk, ORISE/ESSAP W. Snell, NRC/Region III E. Abelquist, ORISE/ESSAP A. Boerner, ORISE/ESSAP File/1673 Distribution approval and concurrence: Initials Technical Management Team Member l Laboratory Manager Or Quality Manager P.O. BOX 117, OAK RIDGE, TENNESSEE 37831-0117 Operated by Oak Ridge Associated Universities for the U.S. Department of Energy
IN-PROCESS INSPECTION SURVEY RESULTS FOR THE TURBINE BUILDING EXCAVATION AT THIE BIG ROCK POINT RESTORATION PROJECT CHARLEVOIX, MICHIGAN INTRODUCTION The U.S. Nuclear Regulatory Commission (NRC) requested that the Oak Ridge Institute for Science and Education's (ORISE) Environmental Survey and Site Assessment Program (ESSAP) perform an in-process inspection survey of the Turbine Building (TB) excavation at the Big Rock Point Restoration Project (BRPRP) in Charlevoix, Michigan. The in-process inspection surveys were performed on September 20, 2005.
PROCEDURES The in-process inspection surveys were performed in accordance with a site-specific survey plan that was submitted to and approved by the NRC (ORISE 2005a). The ORISE/ESSAP Survey Procedures and Quality Assurance Manuals were also followed (ORISE 2004 and 2005b).
Gamma surface scans were performed over 90% of accessible portions of the TB excavation using sodium iodide (NaI) scintillation detectors coupled to ratemeters with audible indicators.
Soil samples collected from five locations within the TB excavation are indicated on Figure 1.
The licensee provided three additional soil samples for comparison analyses. These samples were characterization samples selected from several locations on the site with varying degrees of activity needed to allow ESSAP to more fully assess the quality of the licensee's radioanalytical procedures. As such, these sample locations are not indicated on the figure and were not part of the confirmatory survey of the TB excavation.
SAMPLE ANALYSIS AND DATA INTERPRETATION Radiological data and sample media were returned to ESSAP's laboratory in Oak Ridge, TN for analysis and interpretation. Radionuclide analyses were performed in accordance with the ESSAP Laboratory Procedures Manual (ORISE 2005c). Soil samples were analyzed by gamma spectroscopy for the primary radionuclides of interest (i.e., Co-60 and Cs-137). However, spectra were also reviewed for other gamma-emitting fission and activation products associated with the BRPRP and other identifiable total absorption peaks. The NRC requested additional tritium (H-3) analyses for the ESSAP-collected TB excavation soil samples. ESSAP did not perform Fe-55 or Sr-90 analyses on these samples as they were not major contributors to the dose. Soil sample results were reported in units of picocuries per gram (pCi/g).
FINDINGS AND RESULTS Gamma surface scans did not identify any locations of elevated direct gamma radiation on the soil surfaces within the TB excavation. Three characterization samples that Consumers Energy Corporation (CEC) had analyzed at a contracted, off-site laboratory were also analyzed by ESSAP. The analytical results for the comparative evaluation of the CEC characterization samples are provided in Table 1 and indicated that the CEC contractor laboratory data, within the Big Rock Point Restoration Project 1673\Reports\2005-11-17 In-Process Inspection Survey Results
parameters of sample preparation and analytical procedures, were comparable with ESSAP's analytical results.
The range of radionuclide concentrations for the five confirmatory soil samples collected by ESSAP from the TB excavation are as follows:
Range of Radionuclide Concentrations in ESSAP-Collected Soil Samples (pCi/g)
H-3 Mn-54 Co-60 Cs-137 Eu-152 Eu-154 Eu-155
-1.6 to 2.5 0.00 to 0.01 -0.01 to 0.02 0.00 to 0.01 -0.02 to 0.01 -0.01 to 0.01 0.00 to 0.04 All in-process confirmatory sample results were well within the respective derived concentration guideline levels (DCGLs) for the radionuclides-of-concem (ROC) as specified in the License Termination Plan [LTP (CEC 2004)]. The DCGL's are listed in Table 2 for each ROC. A complete listing of the ESSAP-collected confirmatory soil sample results is presented in Table 3.
The in-process confirmatory surveys did not detect any elevated residual activity through gamma surface scans or through soil sample analyses. Therefore, the results of these survey activities confirm that the radiological conditions of this survey unit are suitable for unrestricted use in accordance with the cleanup criteria cited in the licensee's LTP.
Big Rock Point Restoration Project 2 1673\Reports\2005-11-17 In-Process Inspection Survey Results
1673-001 (x)
.17 .18 0 R 7S J
.14 .13 .12 * .11 85 *1 2
.B .9 . 10 9S
.7 *
.6 .5 ,4
.1 2 .
11 .
- 3 125 .7E 8E .9E .1OE *lE 12E I
N MEASUREMENT/SAMPLING L LOCATIONS
- # SURFACE SOIL 0 FEET 30 METERS FIGURE 1: Big Rock Point, Turbine Building Excavation - Soil Sampling Locations Big Rock Point Restoration Project 3 1673\Reports\2005-11-17 In-Process Inspection Survey Results
TABLE 1 ANALYTICAL COMPARISON OF CEC-COLLECTED SOIL SAMPLES BIG ROCK POINT RESTORATION PROJECT CHARLEVOIX, MICHIGAN Radionuclide Concentrations (pCi/g)
IdentiSfcationm CEC Resultsb ESSAP Results Co-60 Cs-137 Co-60 Cs-137 ESSAP 1673S0006 0.29 +/- 0.04 5.65 +/- 0.12 0.34 +/- 0.04c 6.97 +/- 0.24 CEC #1 ESSAP 1673S0007 0.95 +/- 0.05 9.73 +/- 0.12 1.05 +/- 0.07 9.83 +/- 0.33 CEC #2 ESSAP 1673S0008 15.28 +/- 0.15 4.59 + 0.08 22.88 +/- 0.78 6.08 +/- 0.26 CEC #3 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
3 ESSAP sample numbers 6, 7 and 8 are CEC samples numbers 1, 2 and 3, respectively. These samples were used for interlaboratory analytical comparison and are not confirmatory samples from the TB excavation.
bCEC contractor laboratory sample results were provided by CEC.
CESSAP uncertainties represent the 95% confidence level, based on total propagated uncertainties.
TABLE 2
SUMMARY
OF SOIL DCGLs FROM TABLE 6-10 OF THE LICENSE TERMINATION PLAN BIG ROCK POINT RESTORATION PROJECT CHARLEVOIX, MICHIGAN Radionuclide DCGL (pCi/g)
H-3 327 Mn-54 13.7 Fe-55 3.58 E+05 Co-60 3.21 Sr-90 2.48 Cs-137 13.2 Eu-152 7.35 Eu-154 6.78 Eu-155 287 Big Rock Point Restoration Project 4 1673\Reports\2005-11-17 In-Process Inspection Survey Results
c:
TABLE 3
~0 0 RADIONUCLIDE CONCENTRATIONS 0
IN CONFIRMATORY SOIL SAMPLES 0
CD TURBINE BUILDING EXCAVATION 8 BIG ROCK POINT RESTORATION PROJECT CHARLEVOIX, MICHIGAN Sample Radionuclide Concentrations (pCi/g)
Identification' H-3 Mn-54 Co-60 Cs-137 Eu-152 Eu-154 Eu-155 1673S0001 2.5 +/- 1 4 0.01 +/- 0.02 -0.01 +/- 0.02 0.01 +/- 0.01 -0.02 +/- 0.03 -0.01 +/- 0.05 0.03 +/- 0.03 1673S0002 -1.4 +/- 1.3 0.00 +/- 0.Ole 0.00 +/- 0.02 0.01 +/- 0.02 -0.01 +/- 0.03 0.00 + 0.07 0.00 +/- 0.03 1673S0003 -1.6 +/- 1.3 0.01 +/- 0.01 0.02 +/- 0.02 0.00 +/- 0.01 -0.02 +/- 0.03 -0.01 +/- 0.06 0.04 +/- 0.05 1673S0004 2.4 + 1.4 0.00 +/-0.01 0.00 +/- 0.02 0.01 +/- 0.01 -0.01 +/- 0.04 0.01 + 0.07 0.00 + 0.03 1673S0005 -0.8 +/- 1.4 0.01 +/-0.01 0.02 +/- 0.02 0.00 +/- 0.01 0.01 +/- 0.03 -0.01 + 0.07 0.03 + 0.03 aRefer to Figure 1.
bUncertainties represent the 95% confidence level, based on total propagated uncertainties.
0 CZero values are due to rounding.
CC1 0
IC$
0
REFERENCES Consumers Energy Company (CEC). Big Rock Point Restoration Project, License Termination Plan Revision 1. Charlevoix, Michigan; July 1, 2004.
Oak Ridge Institute for Science and Education (ORISE). Survey Procedures Manual for the Environmental Survey and Site Assessment Program. Oak Ridge, Tennessee; September 2, 2004.
Oak Ridge Institute for Science and Education. In-Process/Confirmatory Survey Plan for the Open Land Area Survey Units, Big Rock Point Restoration Project, Charlevoix, Michigan
[Docket No. 050-0155; RFTA No. 05-012]. Oak Ridge, Tennessee; September 15, 2005a.
Oak Ridge Institute for Science and Education. Quality Assurance Manual for the Environmental Survey and Site Assessment Program. Oak Ridge, Tennessee; July 29, 2005b.
Oak Ridge Institute for Science and Education. Laboratory Procedures Manual for the Environmental Survey and Site Assessment Program. Oak Ridge, Tennessee; June 20, 2005c.
Big Rock Point Restoration Project 6 1673\Reports\2005-11-17 In-Process Inspection Survey Results