ML20058N563
| ML20058N563 | |
| Person / Time | |
|---|---|
| Site: | 07000903 |
| Issue date: | 10/05/1993 |
| From: | Vitkus T External (Affiliation Not Assigned) |
| To: | Johnson T NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| NUDOCS 9310190160 | |
| Download: ML20058N563 (5) | |
Text
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ORISE OAK RtDGE INSTif LfTE f Olt ?, Cat NCf AND ( DLJC A14GN 4 r.# & r e r rI y iii t A '- t i ' #
October 5,1993 4
Mr. Tim Johnson i
Decommissioning and Regulatory Issues Branch i
U.S. Nuclear Regulatory Commission i
Washington, DC 20555 i
SUBJECT:
CONFIRMATORY AND RADIOLOGICAL SURVEYS OF THE NUCLEAR j
LAKE SITE, PAWLING, NEW YORK [ DOCKET NO 070-00903]
i l
Dear Mr. Johnson:
The Environmental Survey and Site Assessment Program (ESSAP) of the Oak Ridge Institute i
for Science and Education performed radiological and confirmatory surveys at the Nuclear Lake site during the period September 20 through 28,1993. The surveys included both structures and soil areas. The complete survey results will be provided in a draft report for NRC review in 3
approximately 2 weeks. In the interim, ESSAP is providing the attached summary of survey 1
findings.
Should you have any questions, please call Michele Landis at (615) 576-2908 or me at (615)-
576-5073.
i Sincerely,
)
71 Timothy J. Vitkus l
Project Leader l
Environmental Survey and i
Site Assessment Program cc:
T. Mo, NRC, NMSS,4H4 D. Tiktinsky, NRC/NMSS, 6E6 l
J. Austin, NRC/NMSS, SE2 i
M. Nalluswami, NRC/NMSS,5E2 J. Swift, NRC/NMSS, 6H3 l
J. Berger, ESSAP M. Landis, ESSAP PMDA, NRC, 6E6 File /225 4
110005 i
P. O. BOX 117, OAK RIDGE, TENNESSEE 37831 0117 i
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PRELIMINARY RESULTS CONFIRMATORY AND RADIOLOGICAL SURVEY OF THE NUCLEAR LAKE SITE PAWLING, NEW YORK b
i Affected Buildings
)
i ESSAP identified residual beta contamination in each of the three affected site stnictures, which were the Plutonium Facility, the Waste Disposal Building, and the Multiple Failure Building.
t in addition, residual alpha contamination was identified in the Plutonium Facility. NES, the 1
4 remedial action contractor for Chevron USA, Inc., was notified of.these findings and j
subsequently performed additional remediation and surveys.
4 Affected Soil Areas Surface scans of the outdoor affected soil areas did not identify any locations of elevated direct t
radiation. One sub-floor location in the northeast corner of the W'aste Disposal Building was i
I identified as having elevated direct gamma radiation. Soil samples collected from the outdoor areas and sub-floor locations are currently being analyzed.
f i
Unaffected Buildings The following unaffected structures; the Engineering Building, Critical Facility, Shield Mock-Up Building, the Lodge, and Remote Assembly Building, were also surveyed. Surface scans and direct measurements for alpha and beta activity were performed in each structure, with the exception of the Lodge where only beta measurements were performed as a result of the extensive debris and water on the floor. The results of the direct measurements are summarized in Tables 1 and 2. There were no locations of residual contamination identified by the surface scans and direct measurements satisfied the NRC's guidelines at the 95% confidence level.
There was one measurement location in the Critical facility (37 dpm/100 cm ) and two locations 2
2 in the Remote Assembly Building (32 and 54 dpm/100 cm ) which exceeded 25% of the alpha surface contamination guidelines. For the Critical Facility, four additional measurements were performed in the surrounding one square meter area. All measurements were less than or equal w au sw..i.w. ocu - 5 im 2
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2 to'the detection sensitivity of the instrumentation which was 25 dpm/100 cm. In the Remote 2
Assembly Building, one location (32 dpm/100 cm ) on the fireplace wall, was a result of the 2
rock and mortar construction material; the second location (54 dpm/100 cm ) was measured on a rock outcropping located in the basement of the structure and was associated with background radioactivity.
There are two additional site features that are to be addressed by NES during structure demolition. The first is the shield blocks located near the Multiple Failure Building, which were not included in the radiological survey. The blocks were stacked in a manner that made most surfaces inaccessible. In addition, the sodium tent is no longer present. A concrete pad and adjacent debris pile was found and is believed to be the remnants of this facility. Gamma surface scans were performed in the vicinity of the debris and the concrete pad. No other measurements were performed. It is ESSAP's understanding that NES surveyed the debris during asbestos abatement activities and intends to perform scans and direct measurements of the concrete pad and the shield blocks during the demolition and removal actions.
Unaffected Soil Areas Surface scans were performed and a minimum of 30 soil samples collected from within each of the four unaffected outdoor survey units. Surface scans identified one area of elevated direct gamma radiation south of the Lodge. Additional samples were collected from this location, as 2
well as the surrounding 100 m area. Soil samples are currently being analyzed.
Nakar th W.Pewling.NY - October 5,1m 3
1 TAllLE 1
SUMMARY
OF SURFACE ACTIVITY LEVELS Q )D h g
UNAFFECTED BUILDINGS JU Lrtl s
NUCLEAR LAKE SITE h
PAWLING, NEW YORK E
""E" Number of Total Activity Range (dpm/100 cm')
- "h"y c 2) f Location Measurement Locations d
Alpha Beta Alpha Beta' f
Critical Facility Floor 26 0 to 37' 660 to 1100
-1 to 4
-7 to 8 6
~
Imwer Walls 8
-7 to 18'
-290 to 5106
-1 to 4
-3 to 8 Engineering Buildin.g Floor 23
-2 to 16' 420-850'
-1 to 4
-5 to 3 Iower Walls 7
0 to 23'
-323 to 230 *
-1 to 6
-1 to 16 Remote Assembly Building Floor 21
-271 to 54'
-270 to 6106
-1 to 1
-7 to 6 Lower Walls 9
-623 to 32'
-620 to 730"
-1 to 4
-4 to 1 Shield Mock-Up Building Floor 27 0 to 39' 420 to 820"
-1 to 6
-7 to 14 Lower Walls 3
-2 to 2*
-580 to -4006 1 to 10
-4 to -3 Lodge Floor 22 NA
-580 to 600*
-1 to 6
-7 to 8 Lower Walls 8
NA
-650 to -240'
-1 to 1
-7 to 6 2
' Minimum detectable activity equal 25 dpm/100 cm for alpha instrumentation.
2
' Minimum detectable activity equals 390 dpm/100 cm for beta instrumentation.
2
' Minimum detectable activity equals 990 dpm/100 cm for beta instrumentation, 2
dMinimum detectable activity equals 12 dpm/100 cm,
2
' Minimum detectable activity equals 16 dpm/100 cm,
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TABLE 2 GUIDELINE COMPARISON OF SURFACE ACTIVITY LEVELS UNAFFECTED BUILDINGS NUCLEAR LAKE SITE l
PAWLING, NEW YORK 2
Averaged Total Activity (dpm/100 cm )
Guidelines /
Surface 6
Alpha.
Beta Building Area Conditions (m')
Number Std.
Number Std.
Satisfied F*,
of Meas.
Deviation of Meas.
Deviation Critical Facility 510 m 34 14 8
16.0 34 660 290 750 Yes 2
Engineering 410 m:
30 6
6 7.9 30 500 280 590 Yes Bldg.
Remote 106 m 30 5
12 8.7 30
-26 300 67 Yes 2
Assembly Bldg.
2 30 11 9
13.8 30 490 350 600
. Yes Shield Mock-Up 60 m Bldg.
Ledge 66 m2 0
NA NA NA' 30
-160 340
-61 Yes
" Alpha surface contamination guidelines:
100 dpm/100 cm, average in a 1 m area i
2 z
2 2
300 dpm/100 cm, maximum in a 100 cm area -
6Beta-gamma surface contamination guidelines:
5,000 dpm/100 cm, average in a 1 m area 2
2 2
2 15,000 dpm/100 cm, maximum in a 100 cm area j
' Calculated value for statistically testing site data in accordance with Draft NUREG/CR-5849.
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