ML032020441
| ML032020441 | |
| Person / Time | |
|---|---|
| Site: | 07000734 |
| Issue date: | 07/14/2003 |
| From: | Asmussen K General Atomics |
| To: | Adams M, Kwok S Office of Nuclear Material Safety and Safeguards, State of CA, Dept of Health Services |
| References | |
| -RFPFR, 696/CAL-3623 | |
| Download: ML032020441 (67) | |
Text
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GENERAL ArOMICS July 14, 2003 696/CAL-3623 Ms. Mary Adams, Fuel Cycle Licensing Branch/Section 1 U.S. Nuclear Regulatory Commission Mail Stop T-8A33 Two White Flint North 11557 Rockville Pike Rockville, MD 20852-2738 (In Duplicate)
Subject:
Docket No.70-734; SNM-696: Submittal of Revised/Complete Version of GA's Report "Concrete Storage Bunker Located Within Area 5 of the Sorrento Valley West Land Area," dated June 2003.
and Ms. Sudana Kwok (in Duplicate)
State of California Department of Health Services Radiologic Health Branch Mail Stop 178 601 North 7th Street Sacramento, CA 95814-0208
Subject:
Radioactive Materials License No.0145-37: Submittal of Revised/Complete Version of GA's Report "Concrete Storage Bunker Located Within Area 5 of the Sorrento Valley West Land Area," dated June 2003.
Ref:
Asmussen, Keith E. Letter No. 696/CAL-3608 dated June 11, 2003 to Ms. Mary Adams and Ms. Sudana Kwok
Dear Ms. Adams and Ms. Kwok:
By letter dated June 11, 2003 (Ref.), General Atomics (GA) submitted a report titled "General Atomics' Final Radiological Survey Report for the Concrete Storage Bunker Located Within Area 5 of the Sorrento Valley West Land Area." It was recently brought to GA's attention that the report was inadvertently missing Tables 1-4. Accordingly, GA has re-issued the report with Tables 1-4 included. Enclosed with this letter is a copy of the re-issued complete report. Please replace the previously received version of the subject report with the enclosed complete copy and discard the old incomplete version.
Iui-s5oI 3550 GENERAL ATOMICS COURT, SAN DIEGO, CA 92121-1122 PO BOX 85608, SAN DIEGO, CA 92186-5608 (858) 455-3000
M. Adams (NRC) I S. Kwok (State)
July 14, 2003 6961CAL-3623 Page 2 GA apologizes for the inconvenience caused by the inadvertent omission of the four tables from the original report. If you should have any questions regarding this matter, or the enclosed report, please don't hesitate to contact Ms. Laura Q. Gonzales at (858) 455-2758, or me at (858) 455-2823.
Very truly yours, Keith E. Asmussen, Ph.D., Director Licensing, Safety and Nuclear Compliance
Enclosure:
Corrected version of GA's report titled: General Atomics' Final Radiological Survey Report for the Concrete Storage Bunker Located Within Area 5 of the Sorrento Valley West Land Area," dated June 2003.
cc:
Dr. D. Blair Spitzberg, Chief, NMSS Branch 3, Region IV Mr. Wayne L. Britz, Fuel Cycle Inspector, NRC Region IV Ms. Kathleen Henner, State of CA, Brea, CA Mr. Tom Schell, State of CA, Sacramento, CA Ms. Barbara Hamrick, State of CA, Brea, CA
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GENERAL ATMUCS FINAL RADIOLOGICAL SURVEY REPORT FOR THE CONCRETE STORAGE BUNKER Located Within Area 5 of the Sorrento Valley West Land Area Prepared By: William LaBonte, William Schuck and Laura Gonzales Illustrated By: Joseph Sullivan Final Survey Technicians: William Schuck June 2003 L
6-L
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GENERAL ATOMICS
Table of Contents INTRODUCTION..............................................
I SITE DESCRIPTION..............................................
I HISTORY AND CLASSIFICATION...............................................
1 History...................................................................
I Classification...........................................................
1 DECONTAMINATION ACTIVITIES...............................................
2 CRITERIA FOR RELEASE TO UNRESTRICTED USE.................................
2 As Low As Reasonably Achievable (ALARA)....................................
2 Facilities and Equipment (and Asphalt or Concrete Surfaces)......
.................. 2 Exposure Rate Guideline.....................................................
3 INSTRUMENTATION & BACKGROUND MEASUREMENTS...........................
3 Background Measurements for Instruments/Detectors.............................
3 Exposure Rate Background...................................................
4 FINAL SURVEYS PERFORMED...................................................
4 Objectives and Responsibilities...............................................
4 Survey Plan...........................................................
4 Survey Summary...........................................................
5 Comparisons of Site Decommissioning Plan Requirements with Final Surveys Performed. 5 RESULTS OF THE FINAL SURVEYS...................
6 Scanning.
6 Fixed Measurements (a and ) ).
6 Removable Activity Measurements..............
.............................. 6 Exposure Rate Scans........................................................
7 Fixed Exposure Rate Measurements............................................
7 CONFIRMATORY SURVEYS......................................................
7 CONCLUSION...........................................................
7 List of Tables Table 1:
USNRC's Acceptable Surface Contamination Levels.........................
T-1 Table 2:
State of California's Acceptable Surface Contamination Levels.....
............ T-2 Table 3:
List of Instruments.
T-3 Table 4:
Storage Bunker, Sorrento Valley West, Area 5, Wipe Survey Results.....
........ T-4 ii
List of Figures (unpaged)
Figure 1:
GA's Main Site and Sorrento Valley Site Figure 2:
Sorrento Valley West Area 5 Figure 3:
Storage Bunker, Interior Dimensions and Wall Identifiers Figure 4:
North Exterior Wall a Scan Locations and Results Figure 5:
South Exterior Wall a Scan Locations and Results Figure 6:
East Exterior Wall a Scan Locations and Results Figure 7:
West Exterior Wall a Scan Locations and Results Figure 8:
North Exterior Wall j3 Scan Locations and Results Figure 9:
South Exterior Wall P Scan Locations and Results Figure 10: East Exterior Wall,B Scan Locations and Results Figure I 1: West Exterior Wall,B Scan Locations and Results Figure 12: Roof IB Scan Locations and Results Figure 13: Interior Wall A&B a Scan Locations and Results Figure 14: Interior Wall C a Scan Locations and Results Figure 15: Interior Wall D a Scan Locations and Results Figure 16: Interior Wall E, F, &G a Scan Locations and Results Figure 17: Interior Floor a Scan Locations and Results Figure 18: Interior Wall A&B P Scan Locations and Results Figure 19: Interior Wall C fi Scan Locations and Results Figure 20: Interior Wall D P Scan Locations and Results Figure 21: Interior Wall E, F, &G P Scan Locations and Results Figure 22:
Interior Floor P Scan Locations and Results Figure 23:
North Exterior Wall Fixed a & j3 Measurement Locations and Results and Wipe Survey Locations Figure 24: South Exterior Wall Fixed a & P Measurement Locations and Results and Wipe Survey Locations Figure 25: East Exterior Wall Fixed a & P Measurement Locations and Results and Wipe Survey Locations Figure 26: West Exterior Wall Fixed cc & P Measurement Locations and Results and Wipe Survey Locations Figure 27:
Interior Wall A & B Fixed a & P Measurement Locations and Results and Wipe Survey Locations Figure 28: Interior Wall C Fixed a & (3 Measurement Locations and Results and Wipe Survey Locations Figure 29:
Interior Wall D Fixed a & P Measurement Locations and Results and Wipe Survey Locations Figure 30: Interior Wall E, F, &G Fixed a &
Measurement Locations and Results and Wipe Survey Locations iii
Figure 31: Interior Floor Fixed a & IQ Measurement Locations and Results and Wipe Survey Locations Figure 32:
North Exterior Wall y Scan Locations and Results Figure 33:
South Exterior Wall y Scan Locations and Results Figure 34: East Exterior Wall y Scan Locations and Results Figure 35: West Exterior Wall y Scan Locations and Results Figure 36:
Roof y Scan Locations and Results Figure 37: Interior Wall A & B y Scan Locations and Results Figure 38:
Interior Wall C y Scan Locations and Results Figure 39: Interior Wall D y Scan Locations and Results Figure 40: Interior Wall E, F, &G y Scan Locations and Results Figure 41: Interior Floor y Scan Locations and Results Figure 42: Storage Bunker Fixed y Measurement Locations and Results Appendix Appendix A:
Final Survey Plan for Sorrento Valley West, Area 5 iv
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CWIERAL A7OMICS Final Radiological Survey Report for the Concrete Storage Bunker, Located Within Area 5 of the Sorrento Valley West Land Area Introduction General Atomics (GA) is continuing its efforts directed at decontaminating, as appropriate, and obtaining the release to unrestricted use of selected facilities and land areas at General Atomics.
GA recently completed Final Radiological Surveys of the Concrete Storage Bunker located within Area S of the Sorrento Valley West Land Area. This concrete storage bunker is located on GA's Sorrento Valley site. This storage bunker has a floor surface area of approximately 118 ft2
( - 11 n2). There are no sewer systems connected to or traversing this structure.
Small spots of low level radioactive contamination (subsequently identified as Cs-137) were detected on the concrete floor and a small section of a wall. The entire floor and an approximately 3'x3' area of the east inner wall were scabbled until levels were not distinguishable from natural background levels.
GA is requesting the Nuclear Regulatory Commission (NRC) and the State of California Department of Health Services' Radiologic Health Branch (DOHSIRHB) to release this storage bunker to unrestricted use.
Site Desciption Area 5 of the Sorrento Valley West Land Area is located on GA's Sorrento Valley Site as shown in Figure 1. The Sorrento Valley West Land Area is shown in Figure 2. A drawing of the concrete storage bunker located within Area 5 of the Sorrento Valley West Land Area is shown in Figure 3. The storage bunker is a small one-room structure having thick concrete walls and floor with dimensions of about 10'x13' (130 ft2) - see Figure 3.
History and Classification History The concrete storage bunker was built in about 1986 to provide shielding for packaged radioactive material having relatively high radiation levels, e.g., >50 mR/hr, (mainly 55 gallon drums awaiting shipment to a licensed low level radioactive waste disposal facility).
Classification Initial scans of the concrete floor of the bunker indicated radiation levels above natural background levels. Based on the history of use and the discovery of elevated activity levels on 1
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GENERAL ATOMICS Final Radiological Survey Report for the Concrete Storage Bunker, Located Within Area 5 of the Sorrento Valley West Land Area the interior concrete surfaces, the bunker was classified as a Suspect Affected Area for radiological survey purposes.
Decontamination Activities Results of scans on the concrete floor indicated elevated radiation levels. A sample of the concrete was removed and sent to the Health Physics laboratory for analysis. The gamma spectroscopy results showed low levels of Cs-137 contamination.
Initially, only the spots of contamination found on the concrete floor were scabbled until radiation levels were below the criteria for release to unrestricted use. However, due to a current moratorium in California on the disposal of anything "above background" from decommissioned sites to a Class 11m landfill, GA decided to clean the surfaces to levels not distinguishable from natural background levels.
To succeed, approximately 1/4" of the entire internal concrete floor surface and 1/4" of the concrete surface in an -1 m2 area on the east interior wall was scabbled and removed and disposed of as low level radioactive waste. Subsequent survey measurements detected radiation only at natural background levels.
Criteria for Release to Unrestricted Use As Low As Reasonably Achievable (ALARM During decommissioning efforts, GA attempts to decontaminate to levels as close to "background" and as far below the approved Release Criteria (as identified in the GA Site D&D Plan) as reasonably achievable.
Facilities and Eguipment (and Asphalt or Concrete Surfaces)
The U.S. NRC's and the State of California's criteria for releasing facilities and equipment to unrestricted use are shown in Tables 1 and 2, respectively. The applicable guideline for beta/gamma emitters (including Cs-137) are as follows:
5,000 dpmlOO cm2, averaged over a 1 m 2area 15,000 dpm/100 cm2, maximum in a 100 cm2 1,000 dpmllO0 cm2, removable activity 2
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GENERAL ATOMICS Final Radiological Survey Report for the Concrete Storage Bunker, Located Within Area 5 of the Sorrento Valley West Land Area Exposure Rate Guideline Exposure rates measured at 1 m above the surface are not to exceed 10 [iR/hr above natural background levels.
Instrumentation and Background Measurements A list of instruments used during the radiological surveys is shown in Table 3. The table includes:
(1) a description of the instrument, model number and its serial number, (2) a description of the detector (if applicable) and its serial number, (3) instrument ranges, (4) calibration due dates, (5) typical background readings and (6) calibration efficiencies (if applicable). All of the instruments used were calibrated semiannually and after repair, except for exposure rate meters which were calibrated quarterly.
Background Measurements for Instruments/Detectors Building 13 on GA's main site was used for conducting background measurements with instruments used for the final survey because: (1) there is no history involving radioactive materials or storage of radioactive materials in Building 13, and (2) the various surfaces and construction materials found at this concrete bunker could also be found within and outside of Building 13. Background information, where appropriate, is included in Table 3.
Minimum detectable activities (MDA's) for instruments used for fixed measurements, for each type of surface (see Table 3), were calculated using equation (5-2) from the NUREG/CR-5849 as shown below:
Equation (5-2)
MA 2.71 + 4.65 ti(dpm/l00cm2) txExA 100 Where:
BR =background rate (cpm) t = count time (min)
E = efficiency A = area of the detector (cm2)
The MDA for scan surveys using the 434 cm2 gas flow proportional detector (floor monitor) was calculated using equation 5-3 from the draft NUREG/CR-5849 (modified in accordance with the discussion on page 5.8 of the draft NUREG/CR-5849):
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CENERAL ATOMICS5 Final Radiological Survey Report for the Concrete Storage Bunker, Located Within Area 5 of the Sorrento Valley West Land Area Equation (5-3):
XxBR MDA=
(dpm/lOOcmn2)
Ex A 100 Where:
X =
the multiple/portion of the background rate that can be discernable as an increase in instrument response by the surveyor (dependent on the type of instrument used).
BR =
background rate in (cpm)
E =
efficiency A =
area of the detector (cm2)
Exposure Rate Background Building 1, which is GA's main administrative building, has a service corridor constructed similarly to the concrete bunker. Building 1 is also a Non-Impacted Area with no known history of radioactive material use or contamination. Exposure rate background measurements were taken in Building 1 for comparison with exposure rate backgrounds in the concrete bunker. The same instrument was used in both areas.
Surface background measurements in Building 1 ranged from 22 to 28 gR/hr (measured about 1" from the concrete surface) and measurements at 1 meter from the concrete surface ranged from 20 to 25 gR/hr.
Final Surveys Performed Objectives and Responsibilities The objectives of the final survey plans were: (1) to demonstrate that the average surface contamination levels for each survey unit were below the approved release criteria, (2) to show that the maximum residual activity did not exceed three times the approved release criteria for average surface contamination value in an area up to 100 cm2, and, (3) that the exposure rate measurements taken in these areas, measured at 1 meter above the surface, were less than 10 tiR/hr above background.
Survel Plan Final Survey Plans are developed based on the previous history of use, the radionuclide(s) of concern for this area, the potential for contamination, the various types of surfaces encountered and the classification of the various areas. The Final Survey Plan for the concrete bunker is part of the Sorrento Valley West, Area 5, Survey Plan which is provided in Appendix A.
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CENERAL ATOMICS Final Radiological Survey Report for the Concrete Storage Bunker, Located Within Area 5 of the Sorrento Valley West Land Area Surveys were taken in accordance with the approved survey plan(s) by qualified Health Physics Technicians having a minimum of three years health physics experience.
Every survey taken was documented on a daily basis to a worksheet/drawing showing the approximate locations surveyed/sampled. The documentation included the results of the measurements (including units), the technician's signature, date, instrument(s) used (including the model and serial number of both the ratemeter and detector), calibration due date, % efficiency, background readings (if applicable) and any other pertinent information.
Survey Summary Comparisons of the Site Decommissioning Plan requirements with the Final Surveys performed in relation to the percentage of surface area scanned, number of measurements (i.e., number of fixed radiation measurements), and exposure rate measurements (tR/hr) taken are provided as follows:
Comparisons of Site Decommissioning Plan Requirements with Final Surveys Performed in the Concrete Bunker within Sorrento Valley West, Area 5 Survey Area Gridding
- of Exposure Rate
- of Direct a, P Surface Scans Required ?
Measurements Measurements Fixed (tR/hr) a, A, or Wipes D-Plan*
Yes I per 4 m2 1 per 4 n2, 100% of floor surfaces Requirements, or I every -2 m or I every -2 m and 100% of lower Suspect Affected Area walls (Below 2m) 4 Total = 17 based on Total = 17 based on
-68 m2 total surface
-68 m2 total surface area below 2m.
area below 2m.
Final Surveys Yes Total of 28 fixed Total of 59 100% of floor surfaces Performed, measurements measurements:
and 100% of lower Suspect Affected Area walls (below 2m)
Plus 100% surface scan 29 a for both a and 3 Floor and interior on all lower wall (<2m) 16 A, activity (internal and lower walls only and 10% of all upper 14 wipes external) 4 walls (>2m)
(> 17 measurements on 10% of upper walls surface & below 2 m)
(above 2 m) for both a and P activity (internal and external)
D-Plan = GA Site Decommissioning Plan Survey Area as classified in accordance with the GA Site Decommissioning Plan.
Total surface area below 2m: floor area is approximately 118 ft2 (- 11 In 2), interior walls (up to 2m) are approximately 288 ft2 (-27 n2 ), and exterior wall surfaces are approximately = 324 ft2. (-30 m2 )
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CIJEAL ATOMICS Final Radiological Survey Report for the Concrete Storage Bunker, Located Within Area S of the Sorrento Valley West Land Area Results of the Final Surveys The results for the Storage Bunker Final Surveys are provided in the figures and Table 4 as discussed below: (See Figure 3 for Bunker wall identification).
Scanning 100% of the concrete floor surface and interior and exterior lower walls (below 2 m) and 10% of the interior and exterior upper walls (above 2 m) were scanned using a 434 cm2 gas flow proportional detector for a activity. The results are provided in Figures 4-7 (exterior walls),
Figures 13-16 (interior walls) and Figure 17 (floor). The results were all < 40 cpm and below the scanning minimum detectable activity (MDA) for this instrument (66 dpm/100 cm2). Alpha activity levels were not discernable from natural background activity.
100% of the concrete floor surface and interior and exterior lower walls (below 2 m) and 10% of the interior and exterior upper walls (above 2 m) were scanned using a 434 cm2 gas flow proportional detector for 3 activity. The results are provided in Figures 8-11 (external walls),
Figures 18-21 (interior walls) and Figure 22 (floor). The scan results ranged from 1700-2400 cpm; similar to background levels on concrete. All results were less than the MDA for this instrument (587 dpm/100 cm2).
Fixed Measurements (a and )
A total of twenty-nine (29) fixed alpha and sixteen (16) fixed beta measurements were taken on the floor, the interior walls, the exterior walls and the roof of the storage bunker for a total of 45 measurements (not including the 14 wipe measurements discussed below). The locations of the measurements and the results are provided in Figure 31 (floor), Figures 27-30 (interior walls),
Figures 23-26 (exterior walls) and Figure 12 (the roof).
The highest a measurement was 20 cpm (background) and well below the MDA for the instrument. The highest P measurement was 1070 counts for 2minutes, which is not distinguishable from the background level of 1081 counts for 2 minutes; all measurements were less than the MDA for the instrument used.
Removable Activity Measurements Fourteen (14) wipe samples were taken and analyzed for a and, activity to determine the removable activity levels. All results were less than 20 dpm/100 cm2 which is consistent with natural background activity levels and far below the approved release criteria. See Figures 23 through 31 for approximate locations and Table 4 for results.
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CEWERAL ATOMICS Final Radiological Survey Report for the Concrete Storage Bunker, Located Within Area 5 of the Sorrento Valley West Land Area Exposure Rate Scans 100% of the concrete floor surface, 100% of the interior and exterior lower walls (below 2 in),
10% of the interior and exterior upper walls (above 2 m) and 10% of the roof were scanned using a 2" x 2" NaI(Tl) detector held within 1" from the surface. The approximate locations are results are shown in Figure 41 (floor), Figures 37-40 (interior walls), Figures 32-35 (exterior walls) and Figure 36 (roof).
The measurements ranged from 14 to 28 ILR/hr (readings were higher inside the concrete storage bunker which is consistent typical background levels inside a concrete room i.e., 22-28 ViR/hr).
Fixed Exposure Rate Measurements Twenty eight (28) fixed measurements were taken with a 2" x 2" NaI(Tl) detector held Im from the surface. The approximate locations are provided in Figures 36 (roof) and Figure 42 (inside and outside of the bunker). All measurements were at normal background levels.
Confirmatory Survey On May 13, 2003, Mr. Wayne Britz, an inspector from NRC's Region IV, performed a confirmatory survey of the storage bunker at GA's request. On June 3, 2003, Mr. Britz sent an e-mail message to GA and the State of California (Ms. Sudana Kwok) stating the following:
"On May 13, 2003, performed a confirmatory survey on the Storage Bunker at Area 5 of the Sorrento Valley West area. The survey included the inside floor and walls, outside walls, foundation, and roof. The alpha and beta measurements were made with an Eberline E-600 dual alpha/beta probe. The gamma measurements were made with a Ludlum 2401-S micro-R meter. The gamma readings at the surface and 1 meter above the ground were all background. The alpha and beta readings were background.
The results of the surveys were less than the criteria established in the site decommissioning plan for unrestricted release, were also background, and were consistent with results that had been obtained by the licensee. The inspection report is in preparation and will be issued within 30 days."
Conclusion Final contamination and radiation surveys, as documented in this report, demonstrate that the residual activity in the concrete storage bunker within Area 5 of the Sorrento Valley West Land Area is not discernable from natural background levels and meets the approved criteria for release to unrestricted use.
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Table 1:.USNRC'S ACCEPTABLE SURF ONTAMINATIONLEVELSi
- Nudides, I
jM Aago afim-
- 1l vableW
! t ;
-:- -:- S; i
IS (dpmillOOe
-m i >dpmIlOO cm) l pXndlOcm2) -1 U-nat, 235U, 238U, & associated decay 5,000 a 15,000 a 1,000 a products Transuranics, 226 a
- 228, 230Th, 100 300 20
- 228T, 2 31Pa 227Ac, 125I 1291 Th-nat, 232Th, 90Sr, 223Ra, 224Ra 2U
,000 3,000 200 l
, 33i, 3i Beta/gamma emitters (nuclides with decay modes other than alpha 5,000 15,000 1,000 emission or spontaneous fission) except 'Sr and other noted above.
11 a
Where surface contamination by both alpha-and beta/gamma-emitting nuclides exists, the limits established for alpha-and beta/gamma-emitting nuclides should apply independently.
b As used in this table dpm (disintegrations per minute) means the rate of emission by radioactive material as determined by correcting the counts per minute observed by an appropriate detector for background, efficiency, an geometric factors associated with the instrumentation.
c Measurements of average contaminant should not be averaged over more than 1 square meter.
For objects of less surface area, the average should be derived for each such object.
d The maximum contamination level applies to an area of not more than 100 cm 2.
e The amount of removable radioactive material per 100 cm 2 of surface area should be determined by wiping that area with dry filter or soft absorbent paper, applying moderate pressure, and assessing the amount of radioactive material on the wipe with an appropriate instrument of known efficiency. When removable contamination on objects of less surface area is determined, then pertinent levels should be reduced proportionally and the entire surface should be wiped.
f The average and maximum radiation levels associated with surface contamination resulting from beta-gamma emitters should not exceed 0.2 mRad/hr at 1 cm2 and 1.0 mRad/hr at 1 cm2, respectively, measured through not more than 7 milligrams per square centimeter of total absorber.
Guidelines For Decontamination of Facilities and Equipment Prior to Release for Unrestricted Use or Termination of Licenses For byproduct, Source, or Special Nuclear Material, incorporated into GA's SNM-696 license.
T-I
Table 2: STATE OF CA ACCEPTABLE SURFACE CONTAMINATION LEVELS '
Nuclidee I
AverageW l
Maximums J Removablew I
(dpmllOOcm) l (dpmOcm) 1 (dpmrlnO0cmi U-nat, 235U, 238U, & associated decay 5,000 15,000 1,000 products Transuranics, 226Ra, 228Ra, 230Th, 228Tk 231Pa, 100 300 20 2 2 7 Ac, 1251, 129_
Tb-nat, 232Th, 90Sr, 223Ra, 224Ra, 232U, 1261, 1,000 3,000 200 133i 131 Beta/gamma emitters (nuclides with decay modes other than alpha emission or 5,000 15,000 1,000 spontaneous fission) except 90Sr and other noted above a Where surface contamination by both alpha-and beta/ganma-emitting nuclides exists, the limits established for alpha-and beta/gamma-emitting nuclides should apply independently.
b As used in this table dpm (disintegrations per minute) means the rate of emission by radioactive material as determined by correcting the counts per minute observed by an appropriate detector for background, efficiency, an geometric factors associated with the instrumentation.
c Measurements of average contaminant should not be averaged over more than 1 square meter. For objects of less surface area, the average should be derived for each such object.
d The maximum contamination level applies to an area of not more than 100 cm'.
e The amount of removable radioactive material per 100 cm2 of surface area should be determined by wiping that area with dry filter or soft absorbent paper, applying moderate pressure, and assessing the amount of radioactive material on the wipe with an appropriate instrument of known efficiency.
When removable contamination on objects of less surface area is determined, then pertinent levels should be reduced proportionally and the entire surface should be wiped.
f The average and maximum radiation levels associated with surface contamination resulting from beta-gamma emitters should not exceed 0.2 mrad/hr at 1 cm2 and 1.0 mrad/hr at 1 cm2, respectively, measured through not more than 7 milligrams per square centimeter of total absorber.
Guidelines For Decontamination of Facilities and Equipment Prior to Release for Unrestricted Use or Termination of Licenses For byproduct, Source, or Special Nuclear Material, also known as "Decon-l" incorporated into GA's State of CA Radioactive Materials License.
T-2
r r
i r
F I I I
I I
(
I r,
I I I".1 !
( -.
I. i F _.
Table 3: Sorrento Valley Wes Area 5, Bunker Survey List Of Instruments Imtrument Detector Range (epm)
Calibration Due Efficiency
Background
Description Date Ludlum Ludlum Model 43-37 Four Linear 1900-2900 cpm Active Probe Area - 434 cm2. The detector and rate meter Model 2221 434 cm ga flow Ranges 09-03-03 31.08%
on concrete are combined and mounted on a roll around cart. The S/N 84459 proportional 0-500,000 & one Scan MDA=
instrument features a static-flow system quick disconnects, Beta detector Log 587 dpm/100 cm2 a portable gas bottle and a means to adjust the height of the S/N 086215 50-500,000 detector from the floor for optimum performance.
Ludium Ludlum Model 43-37 Four Linear 09-03-03 10-30 cpm Active Probe Area - 434 cm'. The detector and rate meter Model 2221 cm3 gas flow Ranges 20.98%
on concrete are combined and mounted on a roll around cart. The S/N 97287 434pcm oal 0-500,000 & one S
MDA-instrument features a static-flow system, quick disconnects, proportional Log can a portable gas bottle and a means to adjust the height of the Alpha detector 50-500,000 66 dpm/100 cm' detector from the floor for optimum performance.
S/N 083293 Ludlum Ludlam Model 44-10 Five Ranges 2 Inch x 2 inch Nal (Ti) scintiulator. Used for measuring Model 3 Nal (Ti) Scintiliator 0-500 ILR/hr 10-09-03 N/A 22-28 jIR/hr contact external dose rates at the surface and at I meter.
S/N 153311 Gamma detector 20-25 piR/hr 1m S/N 155594 (in concrete room)
Ludlum Ludium Model 43-68 Four Linear 0-13-03 35.82%
1081 cp2m Active Probe Area - 100 cm'. The detector and rate meter Model 2221 Ranges on concrete are combined and mounted on a roll around cart. The SI 100 cm gas flow L500,000 & one Instrument features tatic-flow system, quick disconnects, 50-500,000 MDA = 217 dpm/100 cm' a portable gas bottle and a means to adjust the height of the Beta detector detector.
S/N 119444 Ludlum Ludlum Model 43-65 Four Ranges 10-29-03 21.77%
0-20 cpm (all)
Active Probe Area - 50 cm'. Used for Alpha surveying and Model t2 Alpha Scintillator 0-500,000 fixed measurements.
S/N 91056 ZnS(Ag) Alpha detector MDA =220 dpm/100 cm`
S/N 91056 Ludlum Ludlum Model 44-9 Four Ranges 40 cpm (on concrete)
Active Probe Area = 15 cm. Used for Beta/gamma Model 3 Pancake GM 0-500,000 cpm 07-18-03 23.55%
Scan MDA=
sunrveying.
S/N 61488 Beta/gamma detector 2831dpmi/100 cm' S/N 145963 Canberra Canberra Model 2404 Low Level a/p gas proportional Low Level Gas Flow Proportional N/A As needed 30%
Varies with Sample counting system used to count wipes for removable a/P Counter Detector contamination. Results are usually reported as dpm/100 Model 2404 cm.
Canberra High Purity Varies Gamma Spectroscopy MCA system using a high purity Gamma Germanium Detector N/A As needed with Varies with Sample Germanium detector.
Spectroscopy Sample System T-3
Table 4: Storage Bunker, Sorrento Valley West, Area 5 Wipe Survey Results Sample Number a Activity in dpm/l100cm 2 T Activity in dpmIlOOcm 2 See Figures 23-31 for approximate locations 1
<20
<20 2
<20
<20 3
<20
<20 4
<20
<20 5
<20
<20 6
<20
<20 7
<20
<20 8
<20
<20 9
<20
<20 10
<20
<20 11
<20
<20 12
<20
<20 13
<20
<20 14
<20
<20 T-4
Figure 1: Main Site and Sorrento Valley Site Building Numbers Building 1 Building 2 Building 7 Building 9 Building 10 Building 13 Building 14 Building 15 Building 19 Building 21 Building 22 Building 23 Building 25 Builing 27 Building 27-7 Buling 29 Building 29-2 Building 30 Building 31 Building 31-1 Building 31-2 Building 31-3 Building 33 Building 33-1 Building 33-5 Building 34 Building 34-1 Building 34-2 Building 34-3 Building 35 Building 35-1 Building 36 Building 37 Building 39 Building 39-1 Building 41 Building 42 Building 45 Building 63 Building 64 Building 65 Building 66 Building 66 Names Administration Science Laboratories A,.
\\
Cafeteria Experimental Building Maintenance Building Technical Office Building Technical Office East Technical Office East Swimming Pool Building TRIGA Building TRIGA Fuel Lab Building Hot Cell Waste Yard Building Experimental Area Experimental Area Experimental Area C
e Emergency Vehicle Storage Building Stoee 37 LINAC Complex TRIGA Storage Building Burker Neutron Radiography Building ECF Critical Building Storage Building Fusion Building Fusion Lab Building SOrrentO Fusion Building Annex 5 Valley West Fusion Doublet IlIl Building Fusion Doublet IlIl Capacitor Building Area 5 Fusion Doublet Il Lab Building Fusion Doublet IlIl Storage Building Test Tower Building Faclities (Shipping & Receiving) Building Blower Assembly Budding Sorrenlo Valley A Building Sorrento Valley Br Building former site)
LOT32 Storage Building Raw Stok Facility NDT Facility Helium Circulator Test Facility 3550 Dunthill St.
11030 Rosele St.
11040RoselleS.
3520 Durhill St.
/
3510 Durill St.
, /
CONROLL N
W E
S SITE OPEN SPACE SITE
_ X, O-a:
LOTS UCSD FENCING PROPERTY LINE 0
250 500 750 1000 SCALE IN FEET
2: Sorrento Valley West Area 5 I'
It Il
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'l If
'I
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Figure 3: Storage Bunker, Interior Dimensions and Wall Identifiers s
EW N
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Figure 4: Storage Bunker, Sorrento Valley West, Area 5, North Exterior Wall, Alpha Scan Locations and Results 11%
3m IF A
100%
2m All Readings in cpm
Background:
1 0-30 cpm Scan MDA Data Ave. Background 100 cpim concrete X
3 Scr
- MDA, 6 dprnl100 cm
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I Figure 5: Storage Bunker, Sorrento Valley West, Area 5, South Exterior Wall, Alpha Scan Locations and Results 4d%
3T A
All Readings in cpm
Background:
10-30 cpm 1 0O%
Em Scan MDA Data Ave. Background 10.30 cpm, Concrete X
3 Scan MDA, 66 dpnVtOO cOt Concrete
r i I S I I I 1-I X /
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Figure 6: Storage Bunker, Sorrento Valley West, Area 5, East Exterior Wall, Alpha Scan Locations and Results A s 11%
3 n 11%
Zm All Readings in cpm
Background:
10-30 cpm Scan MDA Data Ave. Backgrmund l 10o30p x
3 Concrete H dpmMlOO cm2
[
Figure 7: Storage Bunker, Sorrento Valley West, Area 5, West Exterior Wall, Alpha Scan Locations and Results 7~287
._09/~~~~~~~~~~~~~~~~~~~~~~~903/200 Tm 20-30 Am
~~~~083293 Comments:
,Su=e Pate 4/25/2003 j,
~~~~~~~~~~~~~~~~~~~~~~~
Will Schuck
<20 20-30
<20
<20 All Readings in cpm
Background:
10-30 cpm 1 YO%jm Scan MDA Data Ave. Background 1030 c m, xi 3
Scan MDA, Concrete 06 dpnVlO0 cnO
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1 1 I I
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1 '
Figure 8: Storage Bunker, Sorrento Valley West, Area 5, North Exterior Wall, Beta Scan Locations and Results 10%0 100%
1700-1900 1700-2000 1700-1900 1700-2000 1800-1900 All Readings in cpm
Background:
1900-2900 cpm Doorway 1800-2000 1700-2000 1700-2000 1800-2000 Scan MDA Data Ave. Background 1900-2 cp Concrete X
0.3 Concrete 587 dpWl00 cm'
.~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I 1900-2100 2000-2200 1900-2100 2000-2200
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I Figure 9: Storage Bunker, Sorrento Valley West, Area 5, South Exterior Wall, Beta Scan Locations and Results I
10%
100%
1700-1900 1700-1900 1700-1900 1700-2000 1700-1 900 1800-2000 All Readings in cpm
Background:
1900-2900 cpm Scan MDA Data Ave. Bacgroundl 1900-2900 cpm.
c X.,.
5 8 7 d ~
p n ~
l O m0.
3 Scan MDA, S7dm10c 1800-2000 1700-2000 1800-2000 1700-1900 1700-1900 X
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ I
£ I
2000-2200 2000-2200 2000-2200 2000-2200
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Figure 10: Storage Bunker, Sorrento Valley West, Area 5, East Exterior Wall, Beta Scan Locations and Results 1l%
3,m 1600-1900 A
1800-2000 1700-1900 1700-1900 1800-2000 1700-1900 1C0%
am All Readings in cpm
Background:
1900-2900 cpm Scan MDA Data An. Background l 1900-2900 cpm, I
0.3 Scn DA 587 dpnVIOO wn' 1700-1900 1700-2000 1800-2000 1800-2000 1800-2000 1900-2200 1900-2200
f I
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f l
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I Figure 11: Storage Bunker, Sorrento Valley West, Area 5, West Exterior Wall, Beta Scan Locations and Results I
100%
r0 1700-1900 1800-2000 1800-2000 1700-1900 1800-2000
,~~~~~~~~~~~~~~~~~~~~~~
All Readings in cpm
Background:
1900-2900 cpm Scan MDA Data 1gp0-z900 cpm, I Ave. Background Concrete X
0.3
- MancMOA, 587 dpml10 cW Concrete 5 7dp lO cm 1800-2000 1800-2000 1800-2000 1900-2000 4
4 1
2000-2300 1900-2200
I I
I
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r Figure 12: Storage Bunker, Sorrento Valley West, Area 5, Roof, Exposure Rate Scan, Alpha readings and Direct Frisk, Locations and Results I
<20 10 14-18
<20 13 14 12 13 14-18
<20 10 14-18 13 13 12 14
<100 14-18
<20 10 P
S E+W N
13 One Meter Readings In gR/hr
<20 Alpha Readings In cpm 14-18 Contact Gamma Scan In jIR/hr
<100 Hand Frisk In cpm 16ft Sorrento Vally Storage Bunker jnutttmeittaS Model 12 Model 3 Model 3 N/A S41-Thlitbe.
91056 153311 61488 N/A C~ibrtatlonflii 10/29/03 10/09/03 07/18/03 N/A VE 0i i
21.77%
N/A 23.55%
N/A idvoti. a Y
P
~~~~N/A N/A 15594 145963 N/A beSize-em 50cml
_2X2 1
15cm I
N/A omments:
Ail Resu a B nd Signature:
Hillia Sh Date:
050203
I I
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I Figure 13: Storage Bunker, Sorrento Valley West, Area 5, Interior Wall A & B, Alpha Scan Locations and Results 1%
2; 1CO%
2Im 1%
2; 110%
2m
<20
<20
<20
<20
<20 20-30
<20
<20
<20
<20 All Readings in cpm
Background:
10-30 cpm Scan MDA Data Ave. Background 10J3 pm, x
c Scan MDA, Cocrete 6 dpFli0 cm'
f I
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Figure 14: Storage Bunker, Sorrento Valley West, Area 5, Interior Wall C, Alpha Scan Locations and Results 1%
2m T
11%
2m 20-40 L-222 287
,0-:'
Altiu ha
~~~~~~434 Date 04/25/2003 signature:
Will Schuc 2040 2040 20-30 20-30 20-30 20-30 All Readings in cpm
Background:
10-30 cpm Scan MDA Data Ave. Background 10-30 cp2m, concrete X
3 San A
Concrmte 66 dpmlOO cOm
f I
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I
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Figure 15: Storage Bunker, Sorrento Valley West, Area 5, Interior Wall D, Alpha Scan Locations and Results
r I
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(
(
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I
(
I I Figure 16: Storage Interior Wall E, E
Bunker, Sorrento Valley West, Area 5, F, & G, Alpha Scan Locations and Results F
1%
2;n 1C1%
lem 20-30
<20
<20
<20 20-30 20-30 20-30 7~287 i
~~09/03/2003
~Alpha
~~~~083293 D.ate:I 04/25/2003 Signature:
Will Schuc
<20 20-30 20-30 20-30 20-30 G
1%
20-30 20-30 2m 2O0-3 All Readings in cpm
Background:
10-30 cpm Scan MDA Data Ave. Bacground i-30 cprm Avc. Backsgrund Concrete X
3 Scan MDA, 6
Concrete S6 dpmIO c 2
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(
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Figure 17: Storage Bunker, Sorrento Valley West, Area 5, Interior Floor, Alpha Scan Locations and Results lift All Readings in cpm
Background:
10-30 cpm
[Ave.
Background
10430 cpm.
can MDA Data I l Concrm Scanc MOA 66 dprnfl cs I
13ft
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f Ir
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I Figure 18: Storage Bunker, Sorrento Valley West, Area 5, Interior Wall A & B, BetaScan Locations and Results A
1900-2200 10%
1 00' lf J 1800-2100 2000-2200 1900-2200 2000-2200 B
2000-2200 1900-2200 1900-2100 4T All Readings in cpm
Background:
1900-2900 cpm II
~~~tL ~
Ld 31.~~0861
- s'40=1 11 k
Scan MDA Data AVe. Backound
~1S02900 pm, x
0.3 Ban MDA,
"? dpnzi0o cm' 1 o )ou 1900-2100 2000-2200
I F I
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(
(
(
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I Figure 19: Storage Bunker, Sorrento Valley West, Area 5, Interior Wall C, Beta Scan Locations and Results 1 0%
1900-2100 r
A 10 2000-2200 2000-2200 1900-2200 2000-2200 2200-2400 2000-2400
~~~~09/03/2003 3L08~~3,0%
Comments:
Surve Date 04/25/2003 Sintue Will Schuck All Readings in cpm
Background:
1900-2900 cpm Scan MDA Data Ave. Background 1900-2900 cpm, Conctste X
0.3 can DA, Concrete 587 dpnflOO cn2
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I Figure 20: Storage Bunker, Sorrento Valley West, Area 5, Interior Wall D, Beta Scan Locations and Results 2000-2200 1900-2100 I 1%
I 1*
I 1900-2200 1900-2200 1900-2200 1900-2100 1 00t I
- 4.
I All Readings in cpm
Background:
1900-2900 cpm Scan MDA Data Ave. Background 1900-2900 Cpm, concrete X
0.3 can DA, Concrete M87 dpmIO0 cm2 2000-2200 2000-2300 2000-2200 1900-2100
l I f I r r 17
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Figure 21: Storage Bunker, Sorrento Valley West, Area 5, Interior Wall, E, F, & G, Beta Scan Measurements Locations and Results T
G 1932-2159 A i 14%
110%
1973-2250 2110-2270 E
2041 - 2268 1982-2204 1923-2210 1888-2203 1934-2175 1916-2188 1958-2196 F
1966 - 2140 1937-2170 1965-2214 1843-2259 2011-2241 1I%
100%
I
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XI Figure 22: Storage Bunker, Sorrento Valley West, Area 5, Interior Floor Beta Scan Locations and Results
(
All Readings in cpm
Background:
1900-2900 cpm Scan MDA Data Ave. Baclground 190-20cpm, Concrete X
0.3 Concrete 587 dpmt100 cm'
t - r f
! r t
~~~~~~~~~~~~r f
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t, I
5* 1' I
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(
(
Ii
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Figure 23: Storage Bunker, Sorrento Valley West, Area 5, North Exterior Wall, Fixed Alpha and Beta measurements Locations and Results and wipe survey locations 0
<20 881 (MDA)
<20
<20 909 (MDA)
Doorway Fixed MDA Data Ave. Background 20cpm, Concrete X
n/a Fixed MDA, 220 dpm/100 cm2 Concrete a Ave. Background 1081 cp2m. Concrete X
n/a Concrete B 217 dpm/100 cm2
<20 0
I
(<
= Wipe
- = Alpha Reading in cpm
= Fixed Beta Reading in cp2m
rI rr-r L
[
(
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y r 1
r 1
f Figure 24: Storage Bunker, Sorrento Valley West, Area 5, South Exterior Wall, Fixed Alpha and Beta measurements Locations and Results and wipe survey locations Fixed MDA Data Ave. Background 20 cpm, Concrete x
n/a Flxed MDA, 220 dpml100 CM2 Concrete a 22dmlO cm Ave. Background 1081 cp2m, Concrte X
n/a Concrete 217 dpm/100 cm2 O = Wipe
- = Alpha Reading in cpm
= Fixed Beta Reading in cp2m
I r
1 1 1 I
- r. 1. r-r I frE III I
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Figure 25: Storage Bunker, Sorrento Valley West, Area Beta Measurements Locations and Results 5, East Exterior Wall, Fixed Alpha and and wipe survey locations
<20 796(MDA)
Fixed MDA Data Ave. Background 20 cpm, Concrete a~ ~~~~/
X nla Flxed MP, 220 dpm/100 cm2 Concrete a Ave. Background 1001 cp2m, Concrete X
n/a S-can MDA,'
217 dpmMO00 cm2 Concrete B
<20
<20
()
=Wipe
< # = Alpha Reading in cpm
= Fixed Beta Reading in cp2m
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Figure 26: Storage Bunker, Sorrento Valley West, Area 5, West Exterior Wall, Fixed Alpha and Beta Measurements Locations and Results and wipe survey locations
<20
<20 9 2 9(4MOA) 86 0(MDm
<20 0
~~~~~~~()
~~~~Somet Vsllc B unker
-S"; _ k2221 l2
~dn ~
Mn z91056 Diihil
^
08/13/2003 10a2=00 Ihnixtoit¢z 32 21.77
" ': ~
t A.'.
h'n i'
.l-S,_
119444 WAM Dg; 05/0112003 Sitha; Will Schuck Fixed MDA Data Ave. Background 20 cpm, Concrete X
nla FIXed MOA 22 dprIIlOO crn2 Concrete a 220 Ave. Background 108t cpfm, Conre X
n/a can MeA, 217 dpm/100 cm2 Q) =Wipe
= Alpha Reading in cpm
= Fixed Beta Reading in cp2m I-I
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Figure 27: Storage Bunker, Sorrento Valley West, Area 5, Interior Wall, A and B, Fixed Alpha and Beta Measurements Locations and Results and wipe survey locations Wall A 0D WaIIB Sorrito valle Dnff S~
84423 91036
^e0&13/2003 10/29/2003 235 82%
2 F~~m~~
11444 SL siwB
'. MU Fixed MDA Data Ave. Background 20 epm Concrete X
n/a Fixed MDA, dpwn/lO cm' Concrete 22 pfaOcn Ave. Background 1061 cp2M, Conet X
nla scan M 217 dpm/tOO cm2 Concrete p
) =Wipe c = Alpha Reading in cpm
= Fixed Beta Reading in cp2m
<20 l
856<20
<20 ~
1 856(MDA)
I I V I
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Figure 28: Storage Bunker, Sorrento Valley West, Area 5, Interior Wall, C, Fixed Alpha and Beta Measurements Locations and Results and wipe survey locations ROM IU M O
In~
vac
-UIl-I S;iinature Will SchUc L-2221 11 S~~~~42 91056 j
Bacgrou08/13/2003 mre 35.82%
21 77ff Aapha Date: 05/01/2003 Signature:
Will Schuck Fixed MDA Data Ave. Background 20 cpm, Concrete X
n/a Fixed MDA, 220 dpm/100 cm 2 Ave. Backround 10 1 cp2m, Concrete X
~~~n/a Scan MDA, 217 dpmn/1 00 CM2
<20 o3
=Wipe
- = Alpha Reading in cpm
= Fixed Beta Reading in cp2m
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Figure 29: Storage Bunker, Sorrento Valley West, Area 5, Interior Wall, D, Fixed Alpha and Beta Measurements Locations and Results and wipe survey locations D
4.
Sorrento Valley Bunker a=
84423 91056 DB08/3/203 10L29/2003~
35,82%z 2UZi 1,
Wz Beta
~
b X,
1 19444 NIA m
la Surve h
'01/2003 Will Schuck 989(.MDA)
<20
<20 Fixed MDA Data Ave. Background 20 cpm, Concrete a
20
- cpm, Concreto X
n/a Concrete a 220 dpml100 cm2 Ave. Background 1081 cp2m, Concrete X
n/a Scan VDA, 217 dpm/100 CM2 Concrete B 1 p lO m
(o =Wipe
< # = Alpha Reading in cpm
= Fixed Beta Reading in cp2m
I 1
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I
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Figure 30: Storage Bunker, Sorrento Valley West, Area 5, Interior Wall, E, F, & G, Fixed Alpha and Beta measurements Locations and Results and wipe survey locations Fixed MDA Data Ave. Background 20 cpm, Concrete X
n/a Concrete a 220 dpm/100 cm2 Ave. Background 1061 cp2m, Concret X
n/a Scan MDA, 217 dp/100 cm2 Concrete B 1 p0O
- 14. _
1ZSorrento Valley Bunker g~wiilw; 84423 91056 Aiphi r
]~~19444 W
E~~~~l Q
Comrnents, Survey DL 05/01/2003 Signantr:
Wil Schuc G
<20 (o = Wipe
< # = Alpha Reading in cpm
= Fixed Beta Reading E
in cp2m F
<20 842(-wDA)
<20 901 (<MDA)
<20
I i
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7 I
1 I,
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V ;
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h Figure 31: Interior Floor Fixed Alpha and Beta Measurement Locations and Results and wipe Survey Locations L2221 ai Di~~ 08i12Q 3/20 Q
si¢nafl 35.82%
21 770
,l,19444 Dg& 05i:0 100fi sim Will Schuck Valve Fixed MDA Data Ave. Background a 2Q cpmn, Concrete X
nia Fixed MIJA, 2" dpfiflOO cm2 Concrete a 220 dpn___0 cm Ave. Background 1081 cp2m, Concrste X
n/a scan MUA, 217 dpm/10 c2 Concrete 0 1 pnl Oc (i)= Wipe
- = Alpha Reading in cpm
- ft = Fixed Beta Reading in cp2m
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Figure 32: Storage Bunker, Sorrento Valley West, Area 5, North Exterior Wall, 100% Exposure Rate Scan Locations and Results l
~~~Model-3 1~~~~131 Il C~amma 7
~~~~~~~~~~~~~~~155594 Comets Su&EM Date: 04/29/2003 Doorway sievesre Will Schuc 19-22 19-22 18-22 All Readings in gR/hr
Background:
22-28 gR/hr
I II I
'i 5
1 1
4 I
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X I
I 1' Figure 33: Storage Bunker, Sorrento Valley West, Area 5, South Exterior Wall, Exposure Rate Scan Locations and Results 21-23 20-22 All Readings in jiR/hr
Background:
22-28 j+/-R/hr I m
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I Figure 34: Storage Bunker, Sorrento Valley West, Area 5, East Exterior Wall, Exposure Rate Scan Locations and Results All Readings in giR/hr
Background:
22-28 jiR/hr
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X I
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I Figure 35: Storage Bunker, Sorrento Valley West, Area 5, West Exterior Wall, Exposure Rate Scan Locations and Results Y
20-22 21-24 All Readings in j+/-R/hr
Background:
22-28 giR/hr
I I
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I F
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Figure 36: Storage Bunker, Sorrento Valley West, Area 5, Roof, Exposure Rate Scan, Alpha readings and Direct Frisk, Locations and Results d
S EW N
13ft
<20
<0 14-18
<20 13 14 12 13 14-18
<20 10 14-18 13 13 12 14
<100 14-18
<20 1
13 One Meter Readings In glR/hr
<20 Alpha Readings in cpm 14-18 Contact Gamma Scan In PR/hr
<100 Hand Frisk In cpm 16ft Sorrento Valley Storage Bunker i;mei~ts~
Model 12 Mode3 Model 3 N/A
$erif m
91056 153311 61488 N/A cA1ibration1uiti
~10/29/03 10/09/03 07/18/03 N/A
-i,<,E ss~w 21.77%
N/A 23.55%
N/A rt;___a P
N/A itrobeH w t
~N/A 155594 145963 N/A C.PI Si~ee 50c2 2X2 15cm' N/A Comments:
All Results are Background Signature:
WE=~iam Schuck Date:
0502/03
I I& I f I
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F I I I
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Figure 37: Storage Bunker, Sorrento Valley West, Area 5, Interior Wall A and B, Exposure Rate Scan Locations and Results A
Model-3 25-27 Comments.
Date: 04/29/2003 Siea Will Schuc B
All Readings in gR/hr
Background:
l 1 22-28 gR/hr 25-28
I I
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I Figure 38: Storage Bunker, Sorrento Valley West, Area 5, Interior Wall C, Exposure Rate Scan Locations and Results 25-2 All Readings in jiR/hr
Background:
22-28 CR/hr
I I
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I
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I Figure 39: Storage Bunker, Sorrento Valley West, Area 5, Interior Wall D, Exposure Rate Scan Locations and Results D
25-27 1
26-28 All Readings in giR/hr
Background:
22-28 jiR/hr
I I
(r
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1 IcI
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Figure 40: Storz Interior Wall E, F, and G
23-25 Bunker, Sorrento Valley West, Area 5, Exposure Rate Scan Locations and Results F
22-24 E
24-26 All Readings in jiR/hr
Background:
22-28 gR/hr
f I
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I Figure 41: Storage Bunker, Sorrento Valley West, Area 5, Interior Floor, Exposure Rate Scan Locations and Results All Readings in gR/hr
Background:
22-28 gR/hr
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Figure 42: Storage Bunker, Sorrento Valley West, Area 5, Exposure Rate Measurement Locations and Results 16 19 19 18 E
IN 17 18 18 18 16 16 17 All Readings in pR/hr
Background:
20-25 pR/hr
§ 1 m inside
Background:
11-1 9 pR/hr
@ 1 m outside 16 19 19 18 16
General Atomics' Final Radiological Survey Report For Storage Bunker, Sorrento Valley West, Area 5 Appendix A Sorrento Valley West, Area 5, Final Survey Plan
Page 1 of4 April 15, 2003 rdi}i9 Prepared By:
Approved By:
J(
OX 9I<D Lf
/O.3 L. Q. Gonzales Final Radiological Survey Plan for Sorrento Valley West. Area 5. Land Area Scope This Final Survey Plan is for Sorrento Valley West, Area 5, Land Area. This parcel of land is located in the GA Sorrento Valley Site. This Land Area contains a concrete shielded bunker previously used to store high levels of radioactive material awaiting packaging or shipment to a licensed facility for disposal. The remainder of this area is open land, portions of which are paved with asphalt. There are no sewer systems or storm drain piping systems that traverse this area.
The total surface area of this land area is approximately 5,120 * (- 580 m2 ). The floor space of the storage bunker is approximately 225 * (- 21 m2). See Figure 1.
History and Classification This portion of the Sorrento Valley West Land areas was previously included with Sorrento Valley West, Area 4,Land Area. During the final survey, elevated activity levels were found in the soil, on asphalt, and interior portions of the storage bunker within this area. For expediency reasons, Sorrento Valley West, Area 4, Land Area was divided into two survey areas. This portion was renamed Sorrento Valley West, Area 5, Land Area and extensive decontamination operations were performed.
Due to the elevated activity levels found in this area, the entire area is classified as a Suspect Affected Area for survey purposes.
Survey Objectives and Responsibility The purpose of performing a final survey is to demonstrate that the radiological conditions within the Torrey Pines East Land Area satisfy the NRC and State of CA guidelines for release to unrestricted use. The objectives include (1) to show that the average surface contamination levels for each survey unit are within the authorized value, (2) to show that the maximum residual activity ("hot spot" area) do not exceed three times the average value in an area up to 100 cm2 and (3) that a reasonable effort has been made to clean removable contamination and fixed contamination and (4) that the exposure rates in occupiable locations are less than 10.LRihr above background measured at 1 meter above the surface. Samples will be counted in the Health Physics laboratory (onsite). Surveys will be taken only by qualified Health Physics Technicians having a minimum of 3 years Health Physics SVSW survey pan.wpd
Page 2 of 4 Technician experience. The survey and final report documenting the survey will be performed by GA's Health Physics group.
Release Criteria (per GA Site Decommissioning Plan!
Concrete/Asphalt Surface Release Criteria The predominate isotopes associated with the storage bunker, based on the characterization survey results, is the Fission product Cs-137. The NRC release criteria for mixed fission and activation products is:
5,000 dpm /100 cm2, averaged over a 1 m2 area 15,000 dpm /100 cm2, total, maximum in a 100 cm2 area 1,000 dpm/1 00 cm2, removable activity Exposure Rate Measurements The guideline value for exposure rates measured at 1 m above the surface, is 10 pR/hr above background.
Soil Sample Results The predominant radionuclides found in the soil at GA and the approved release criteria in pCi/g (above natural background concentrations) for these radionuclides are provided as follows:
Enriched Uranium (U-234 + U-235) 30 pCilg Thorium (Th-228 + Th-232) 10 pCilg Depleted Uranium 35 pCi/g Cs-137 15 pCi/g Cs-134 10 pCi/g Co-60 8 pCi/g Eu-152 11 pCi/g Alert Levels Alpha Alert Values If the following "alert levels" are exceeded, notify HP Management so an evaluation can be performed and to evaluate if decontamination is required.
> 100 cpm alpha using the large area (434 cm2) probe (check area with a hand-held alpha meter).
> 60 cpm using a 50 cm2 hand-held alpha probe (- 600 dpm/100 cm2)
Beta Monitoring
>300 cpm above the appropriate background using the 434 cm2 probe.
>200 cpm above the appropriate background using the 100 cm2 probe.
>150 cpm above background using a portable GM detector.
SVSW survey plan.wpd
Page 3 of 4 Exposure Rate Measurements
> 25 giR/hr at surface
> 20 hR/hr at 1 m Soil Sample Results Any soil sample result greater than 30% of the release limit.
Documentation Every survey conducted must be documented on a daily basis on a drawing showing the approximate locations surveyed. Include the results (including units), the technicians signature, date, instrument(s) used (including model and serial number of both the ratemeter and the detector), calibration due date,
% efficiency, background readings (if applicable) and any other applicable information.
SVSW survey plan.wpd
Page 4 of 4 Final Radiological Surveys Planned for the Sorrento Valley West, Area 5, Land Area Type of Survey/Activity Suspect Affected Area, Suspect Affected Area, Open Land Area Storage Bunker Gridding Required?
Yes, lOxlo m grids Yes, 2m x 2 m grids.
Asphalt or Concrete Surfaces (
100 % on land areas.
100 % on all surfaces (internal and (Scan w/ 434 cm22 alpha probe).
external) up to 2m from the floor.
10% of surface greater than 2m high.
Asphalt or Concrete Surfaces (1) 100 % on land areas.
100 % on all surfaces (internal and (Scan w/ 434 cmn beta probe).
external) up to 2m from the floor.
10% of surface greater than 2m high.
Minimum number of 1 measurement per 4 in2, or, 1 measurement per 4 i2, or, Measurements (2) (3) 1 measurement every -2 m 1 measurement every -2 m Alternate between (1) a wipe, (2) an Alternate between (1) a wipe, (2) an alpha fixed measurement and (3) a alpha fixed measurement and (3) a beta fixed and alpha fixed beta fixed and alpha fixed measurement on all asphalt or measurement concrete surfaces. Total number of measurements on land = 80 ( based on 320 m2 asphalt area).
l.R/hr Readings, Scans 100% scan on all surfaces, detector 100% scan on all surfaces (internal held -" from surface and external), detector held -1" from surface below 2m from floor, 10%
above 2m.
.R/hr Readings 1 every 2m 1 every 2ml
@ Im from surface Soil Samples Based on a 5 meter triangular grid NA system. See Figure 2 Notes:
(I)
(2)
Clean surfaces to remove debris or dirt.
For the fixed measurements:
For a measurements; use either the hand held alpha counter (minimum of -6 second count).
Document all readings in cpm.
For,B measurements; take a 2 minute count using the 100 cm2 gas flow proportional detector (beta) with the Model 2221 ratemeter.
Document all readings and mark on a drawing the locations the readings were taken.
For wipes, analyze each 100 cm2 wipe for a and P activity.
A "measurement" is either (1) a "fixed" radiation measurement representing total activity or (2) a wipe (removable activity).
(3)
SVSW survey plan.wpd
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