ML070320448
| ML070320448 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 07/18/2006 |
| From: | Adams W Oak Ridge Institute for Science & Education |
| To: | Tanya Smith NRC/FSME |
| References | |
| RFTA 06-006 | |
| Download: ML070320448 (11) | |
Text
SR~1 S H OAK RIDGE INSTITUTE FOR SCIENCE AND EDUCATION July 18, 2006 Mr. Theodore Smith Mail Stop: T-7F27 Division of Waste Management U.S. Nuclear Regulatory Commission 11545 Rockville Pike Rockville, MD 20852
SUBJECT:
CONFIRMATORY SURVEY RESULTS FOR THE EAST MOUNTAIN SIDE AT THE CONNECTICUT YANKEE HADDAM NECK PLANT, HADDAM, CONNECTICUT [DOCKET NO. 50-0213; RFTA NO. 06-006]
Dear Mr. Smith:
The Oak Ridge Institute for Science and Education (ORISE) performed confirmatory survey activities on the East Mountain Side (Survey Units 9527-0001, 9527-0002, 9527-0003, and 9527-0004) at the Connecticut Yankee Haddam Neck Plant in Haddarm, Connecticut, on April 25 and 26, 2006. This survey activity was requested and approved by the U.S. Nuclear Regulatory Commission (NRQ. Confirmatory survey activities included gamma surface scans and soil sampling. Enclosed are the 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, Wade C. Adams Health Physicist/Project Leader Survey Projects WCAtdb Enclosure c:
B. Watson, NMSS/DWMEP/DD/SP 7E18 E. Ablequist, ORISE E. Knox-Davin, NRC/NMSS/TWFN 8A23 S. Kirk, ORISE L. Kauffman, NRC/Region I M. Miller, NRC/Region I J. Kottan, NRC/Region I File/ 1698 Distribution approval and concurrence: Inipals .
Technical Management Team Member -J---/-- "
Laboratory Manager Qualty Manager Voice: 865.576.0065 Fax: 865.241.3497 E-mail: AdamsW@orau.gov
CONFIRMATORY SURVEY RESULTS FOR THE EAST MOUNTAIN SIDE AT THE CONNECTICUT YANKEE HADDAM NECK PLANT HADDAM, CONNECTICUT INTRODUCTION The U.S. Nuclear Regulatory Commission (NRC) requested that the Oak Ridge Institute for Science and Education (ORISE) perform confirmatory surveys of the East Mountain Side (Survey Units 9527-0001, 9527-0002, 9527-0003, and 9527-'0004) at the Connecticut Yankee (CY) Haddam Neck Plant (HNP) in Haddam, Connecticut (Figure 1). Confirmatory surveys were performed on April 25 and 26, 2006. Areas of the HNP included in the survey are depicted in Figure 2.
PROCEDURES Confirmatory surveys were performed in accordance with a site-specific survey plan that was submitted to and approved by the NRC (ORISE 2006). Survey activities were implemented in accordance with ORISE Survey Procedures and Quality Assurance Manuals (ORISE 2004 and 2005a).
The survey activities included gamma surface scans that were performed over 60 to 75% of accessible portions of the grounds within Survey Units (SU) 9527-0001 through 9527-0004. Sodium iodide (NaD) scintillation detectors coupled to ratemeters with audible indicators were used for scanning. Accessibility to some areas was restricted due to safety concerns for ORISE personnel.
Soil samples were collected from six judgmentally selected locations within SUs 9527-0001 and 9527-0002 and five judgmentally selected locations within SUs 9527-0003 and 9527-0004 (Figures 3 through 6).
SAMPLE ANALYSIS AND DATA INTERPRETATION Radiological data and sample media were returned to ORISE's laboratory in Oak Ridge, TN for analysis and interpretation.,Radioassays were performed in accordance with the ORISE Laboratory Procedures Manual (ORISE 2005b). 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 HNP and other identifiable total absorption peaks. Soil sample results were reported in units of picocuries per gram (pCi/g).
FINDINGS AND RESULTS Gamma surface scans identified three locations of elevated direct gamma radiation in SU 9527-0004 for further investigation. No elevated gamma activity was detected within the remaining SUs.
ORISE personnel collected biased soil samples from these three locations and from two additional judgmentally selected locations within the SU. Seventeen soil samples were collected from judgmentally determined locations within SUs 9527-0001 through 9527-0003.
Connecticut Yankee, East Mountain Side 1698\Reports\2006-07-18 Confinratory Survey Results.doc
The range of radionuclide concentrations for the five to six soil samples collected within each SU by ORISE are as follows:
Range of Radionuclide Concentrations in Soil Samples (pCi/g)
Survey Units' Co-60 Cs-137 9527-0001 -0.02 to 0.02 0.42 to 1.86 9527-0002 -0.02 to 0.05 0.40 to 1.38 9527-0003 0.00b to 0.05 0.13 to 1.36 9527-0004 -0.01 to 0.07 0.87 to 3.32
'Refer to Figures 3 through 6.
bZero values due to rounding.
A complete listing of the confirmatory sample results is presented in Table 1.
COMPARISON OF SOIL SAMPLE RESULTS AGAINST THE RELEASE CRITERIA A comparison of the soil sample results against the site-specific operational derived concentration guideline levels (DCGLs) for Co-60 (1.22 pCi/g) and Cs-137 (2.53 pCi/g) as per the Final Status Survey (FSS) Release Records for each SU was performed to determine whether or not the site was suitable for unrestricted release (CYAPCO). The confirmatory survey activities determined that detectable Cs-137 concentrations, in excess of the site-specific operational soil DCGLs, were present in two soil samples within the East Mountain Side SU 9527-0004. These two soil samples (Samples 1698S0002 and 1698S0003) were collected just above a granite rock surface at a depth of approximately 0.8 cm. A review of the FSS report for this SU indicates that the ORISE survey data corroborates the CY FSS data; that although the Operational DCGL is exceeded, the soil concentrations are less than the Base Case DCGL criteria listed in Table 2 of the FSS for SU 9527-0004. The radionuclide concentrations for all the remaining soil samples were below their respective Co-60 and Cs-137 Operational DCGLs.
Based upon ORISE's confirmatory survey results, the radionuclide concentrations present in the soil samples for SUs 9527-0001 through 9527-0004 are commensurate with the release criteria specified within their respective FSS Release Records (CYAPCO). Therefore, it is ORISE's opinion that the radiological conditions for these SUs are suitable for unrestricted use in accordance with the clean up criteria in the License Termination Plan [LTP (CYAPCO 2005)].
Connecticut Yankee, Fast Mountain Side 2 1698\Reports\2006-07-18 Confirmatory Survey Results.doc
1698-001 (X)
Haddam Neck Plant N
~~jrI NOT TO SCALE FIGURE 1: Location of the Connecticut Yankee Haddam Neck Plant - Haddam, Connecticut Connecticut Yankee, East Mountain Side 3 1698\Reports\2006-07-18 Confirmatory Survey Results.doc
1698-002 (2) 9527-00,03 952 7-0002
,- 9527-0001 k
NOT TO SCALE FIGURE 2: Plot of the Connecticut Yankee Haddam Neck Plant Site Indicating Areas Surveyed East Mountain Side Connecticut Yankee, East Mountain Side 4 1698\Reports\2006-07-18 Confirmatory Survey Results.doc
1698-003 (2)
SAMPLING LOCATIONS LEGEND 0OI SfTIILE ' z Stone wall NOT TO SCALE FIGURE 3: East Mountain Side, Survey Unit 9527-0001 - Soil Sampling Locations Connecticut Yankee, East Mountain Side 5 1698\Reports\2006-07-18 Confirmatory Survey Results.doc
1698-004 (3)
SANMPLING LOCATIONS LEGEND
-,SOILSATMPLE z Stone wall N
NOT TO SCA-LE FIGURE 4: East Mountain Side, Survey Unit 9527-0002 ' Soil Sampling Locations Connecticut Yankee, East Mountain Side 1698\Reports\2006-07-18 Confirmatory Survey Results.doc 6
1698-005 (2) 168002 7898S0018 169,6500 7J:37 1698SO012 86985 1698SOO15 SAMPLING LOCATIONS LEGEND p # SOTL SAMPLE z Stone wall 0
NOT TO SCALE FIGURE 5: East Mountain Side, Survey Unit 9527-0003 - Soil Sampling Locations Connecticut Yankee, East Mountain Side 7 1698\Reports\2006-07-18 Confirmatory Survey Results.doc
1698-006 (2) 7, H m 1698SOOO2
]698S0005 1698S001I SA7\YPLJN G LOCATIONS SOIL SAMPLE NOT TO SCALE FIGURE 6: East Mountain Side, Survey Unit 9527-0004 - Soil Sampling Locations Connecticut Yankee, East Mountain Side 8 1698\Reports\2006-07-18 Confirmatory Survey Results.doc
TABLE 1 CONFIRMATORY SURVEY RESULTS FOR THE EAST MOUNTAIN SIDE AT THE CONNECTICUT YANKEE HADDAM NECK PLANT HADDAM, CONNECTICUT Radionuclide Concentrations (pCi/g)
Sample Location' Co-60b Cs-137b Survey Unit 9527-0001 1698S0006 0.02 + 0.03c 1.86 +/- 0.13 1698S0007 0.00d + 0.02 0.42 +/- 0.05 1698S0008 0.02 +/- 0.03 0.49 + 0.05 1698S0009 -0.02 +/- 0.02 0.51 +/- 0.05 1698S0010 0.00 +/- 0.03 0.74.+/- 0.08 1698S0011 0.00 +/- 0.03 0.88 +/- 0.09 Survey Unit 9527-0002 1698S0017 -0.02 +/- 0.04 0.57 +/- 0.08 1698S0018 0.03 +/- 0.03 0.64 +/- 0.07 1698S0019 0.01 +/- 0.03 1.38 +/- 0.11 1698S0020 0.01 +/- 0.02 0.57 +/- 0.06 1698S0021 0.01.+/- 0.04 0.53 +/- 0.06 1698S0022 0.05 +/- 0.08 0.40 +/- 0.07 Survey Unit 9527-0003 1698S0012 0.01 + 0.02 0.84 +/- 0.06 1698S0013 0.05 +/- 0.06 0.45 +/- 0.05 1698S0014 0.01 +/- 0.03 1.36 +/- 0.10 1698S0015 0.00 +/- 0.00 0.13 +/- 0.01 1698S0016 0.01 +/- 0.02 0.46 +/- 0.04 Survey Unit 9527-0004 1698S0001 -0.01 +/- 0.04 1.19 +/- 0.10 1698S0002c 0.07 +/- 0.04 3.32 +/- 0.23 1698S0003e 0.03 +/- 0.03 2.51 +/- 0.16 1698S0004 0.02+/- 0.05 1.22 0.12 1698S0005 0.03 +/- 0.03 0.87 +/- 0.10
'Refer to Figures 3 through 6.
bThe LTP Base Case DCGL values are 3.81 pCi/g for Co-60 and 7.91 pCi/g for Cs-137. The FSS Operational DCGL values are 1.22 pCi/g for Co-60 and 2.53 pCi/g for Cs-1 37.
cUncertainties represent the 9 5% confidence level, based on total propagated uncertainties.
dZero values due to rounding.
'These two soil samples were collected just above granite rock surfaces at a depth of approximately 0.8 cm.
Connecticut Yankee, East Mountain Side 1698\Reports\2 6 06-07-18 Confirmitory Survey Results.doc 9
a REFERENCES Connecticut Yankee Atomic Power Company (CYAPCO). Draft-CYAPCO Final Status Survey Release Records, East Mountain Side, Survey Units 9527-0001, 9527-0002, 9527-0003, and 9527-0004. Connecticut Yankee Haddam Neck Plant, Haddam, Connecticut; Reference dates not provided.
Connecticut Yankee Atomic Power Company. License Termination Plan, Connecticut Yankee Decommisslonig Project, Haddam Neck Plant, Revision 3. Haddam, Connecticut; August 2005.
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. Quality Assurance Manual for the Environmental Survey and Site Assessment Program. Oak Ridge, Tennessee; July 29, 2005a.
Oak Ridge Institute for Science and Education. Laboratory Procedures Manual for the Environmental Survey and Site Assessment Program. Oak Ridge, Tennessee; June 20, 2005b.
Oak Ridge Institute for Science and Education. Proposed Confirmatory Survey Plan for the Remaining Structural Surfaces, Embedded Piping, Standing Water and Open Land Area Survey Units, Connecticut Yankee Decommissioning Project, Haddam, Connecticut Pocket No. 50-0213; RFTA No. 06-006]. Oak Ridge, Tennessee; April 21, 2006.
Connecticut Yankee, East Mountain Side 10 1698\Reports\2006-07-18 Confirmatory Survey Results.doc