ML20203C325

Final Radiological Survey Performed at General Atomics Bldg 37 Tunnel & Tunnel Annex

ML20203C325
Person / Time
Site:	07000734
Issue date:	02/01/1999
From:	Gonzales L, Maschka P, Joseph Turner GENERAL ATOMICS (FORMERLY GA TECHNOLOGIES, INC./GENER
To:
Shared Package
ML20203C305	List: ML20203C302 ML20203C308 ML20203C317 ML20203C325
References
PROC-990201, NUDOCS 9902110359
Download: ML20203C325 (60)

Text

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g FINAL RADIOLOGICAL SURVEY PERFORMED AT GENERAL ATOMICS'

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BUILDING 37 TUNNEL & TUNNEL ANNEX l

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Prepared By: John Turner, Paul Maschka, Laura Gonzales, Stephen Finchum, Richard Stowell, Efraim Ramirez

l Cornelius Stanley & Barbara Lyons.

l February 1,1999

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I 9902110359 990208 PDR ADOCK 07000734 1 B

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Table of Contents INTRODUCTI ON............................................................... 1 l

S ITE DESCRIPTION........................................................... 1 PREVIOUS ACTIVITIES (HISTORY OF USE)....................................... 2 CRITERIA FOR RELEASE TO UNRESTRICTED USE................................ 2 Facilities and Equipment.................................................... 2 Enrich ed Uranium......................................................... 2 Natural Thorium......................................................... 3 l

Beta Guideline Values (thorium) within the Tunnel / Funnel Annex.................. 3 g

Exposure Rate Guideline.................................................... 3 g

INSTRUMENTATION........................................................... 4 BACKGROUND MEASUREMENTS.............................................. 4 l

Background Measurements for Instruments / Detectors

.................4 Exposure Rate Background.................................................. 5 DECONTAMINATION ACTIVITIES............................................... 5 FINAL SURVEYS PERFORMED.................................................. 5 Objectives and Responsibilities.............................................. 5 Classi fication of Areas.................................................... 6 Final S urvey Plans........................................................ 6 SURVEY

SUMMARY

........................................................... 7 RESULTS OF THE FINAL SURVEYS.............................................. 7 l

l S canni ng.............................................................. 7 Fixed Mea surem ents....................................................... 7 Pa int S ampl es............................................................ 8 Removable Contamination Surveys........................................... 8 Exposure Rate Measurements............................................... 8 CONC LUS IO N................................................................. 9 I

I List of Tables Table 1:

USNRC's Acceptable Surface Contamination Levels......................... T-1 l

Table 2:

State of CA Acceptable Surface Contamination Levels........................ T-2 Table 3:

List o f Instmments.................................................... T-3 Table 4:

Background Mcasurements (Obtained from Building 13)...................... T-5 Table 5:

Results of Final Surveys in Building 37 Tunnels............................. T-6 11 lI

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List of Fleures (unnamed)

Figure 1:

Plan View ofGeneral Atomics Site Figure 2:

Building 37 in Relation to Surrounding Facilities Figure 3:

Tunnel and Tunnel Annex l

Figure 4:

Drawing of Building 37 (Tunnel) h Figure 5:

Drawing of Building 37 (Tunnel Annex)

N Figure 6:

Tunnel: Alpha & Beta Scan Results Figure 7:

Tunnel: Fixed Beta & Exposure Rate Measurements FigureP.

Tunnel: Removable Contamination Locations-Floor & Walls & East Wall Stmetures Figur: 9:

Ter.aci: Removable Contamination Locations-West Wall Structures & Sealed Drains Figure 10:

Tunnel Annex: Alpha and Beta Scan Results I

Figure 11:

Tunnel Annex: Scan Results on Top of the Ledge Figure 12:

Tunnel Annex: Removable Contamination Locations Figure 13:

Tunnel Annex: Fixed Beta and Exposure Rate Measurements I

Figure 14:

Tunnel Annex: Paint Sample Collection Appendix

" Survey Plan for Building 37 - South Tunnel" dated September 11,1997.

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" Survey Plan for Building 37 - Tunnel Annex" dated September 16,1997.

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.hsusumurmuerommes Tunnel & Tunnel Annex (Bld. 37) Final Survey Report Introduction General Atomics (GA) is continuing its efforts directed at decontaminating, as appropriate, and I

obtaining the release to unrestricted use of selected facilities at General Atomics. GA has recently completed the Final Radiological Survey of the Tunnel and the Tunnel Annex located on the East side of the remaining portion of Building 37 (Sorrento Valley A).

I GA is requesting both the Nuclear Regulatory Commission (NRC) and the State of Califomia for the release of the Tunnel and the Tunnel Annex as well as their respective entrance / exit area concrete

" pads" or " footprints" to unrestricted use.

This report documents the results of extensive and comprehensive radiological measurements I

completed inside the Tunnel, its Annex and their respective entrance / exit area concrete

" pads"/" footprints" and demonstrates that these areas meet the approved criteria for release to unrestricted use. The total surface area to be released to unrestricted use is ~ 3360 ft (~ 312 m ),

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Site Description A plan view of the GA Site is shown in Figure 1. The location of Building 37 in relation to other facilities at GA's Sorrento Valley Site is shown in Figure 2. The tunnel and the tunnel annex in I

relation to one another are shown in Figure 3. The tunnel and the concrete " footprints" outside the east and north doors are shown in Figure 4. The tunnel annex and the concrete " footprint" outside I

the north door are shown in Figure 5. Both the tunnel and the tunnel annex are located on the same level, beneath the east end of Building 37.

The large tunnel has internal dimensions of~ 241.5 ft x 9.25 ft and encompasses an area of~ 2234 2

2 ft (~ 207.5 m ). The concrete footprint outside the tunnel's cast door measures ~ 11 ft x 8.5 ft. and g

has an area of~ 93.5 ft2 (8.7 m ). The concrete footprint outside the north door measures ~ 10 ft x 2

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g 9.5 ft and has an area of ~ 95 ft ( ~ 8.8 m ),

I Tne smaller tunnel annex, located directly to the east of the large tunnel, has intemal dimensions of t

2 109.5 ft x 7.75 ft and encompasses an area of ~ 848.5 fi (~ 78.8 m ). The concrete footprint outside the north door measures 11.5 ft x 7.75 ft and has an area of~ 89 ft2(~ 8.3 m ),

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The floor surfaces of the tunnel and the tunnel annex are composed of approximately 8 inches of reinforced concrete slabs. The walls of the tunnel are composed of reinforced concrete prefabricated panels and are approximately 7 % inches thick. The bottom one (1) meter of the annex's cast wall is composed ofconcrete. The remaining portion of the wall above one (1) meter is composed of standard corrugated metal stock. The remaining walls of the annex are composed of reinforced 1of9

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l 4-= mouses Tunnel & Tunnel Annex (Bld. 37) Final Survey Report concrete prefabricated panels and are approximately 7 % inches thick. The doors of the tunnel and the tunnel's annex are composed of metal. The roofs of the tunnel and the tunnel annex are composed ofprestressed concrete.

There are two sealed drains located in the concrete floor of the tunnel. The drains have been sealed with a gasket and a steel plate to prevent any moisture from entering these areas. This was done prior to the storage of the Special Nuclear Material for proper containment purposes.

l Previous Activities (History of Use)

The tunnel and the tunnel annex were used to store properly contained Special Nuclear Material (SNM) utilized within the northem portion of Building 37 (i.e., formerly called the "SVA Fuel Manufacturing Facility," which was decommissioned between 1990-1995 designated as the SVA Decommissioning Project).

Based on the previous history of work conducted in the northern portion of Building 37, the I

predominant radiological contaminants contained within the properly stored packages within the tunnel and its annex were enriched uranium (typically ~ 93% U-235) and natural thorium.

g Criteria for Release to Unrestricted Use Facilities and Eauinment U.S. NRC's criterion for releasing facilities and equipment to unrestricted use is shown in Table 1.

The State of Califomia's guidelines, "DHS Criteria for Release of Facilities and Equipment to Unrestricted Use," also known as "DECON-1,"is shown in Table 2.

Enriched Uranium I

The approved guideline values for residual contamination for release to unrestricted use for enriched uranium are provided below:

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5,000 dptrJ100 cm (averaged over a 1 m area) 3hodp*[oo"c*[2 rem vIb ea ivIy

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I It was GA's goal to decontaminate (as necessary) and to release the tunnels at levels < 1000 a 2

dpm/100cm (thorium limit).

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iI 4 '""""" AMMCW Tunnel & Tunnel Annex (Bld. 37) Final Survey Report Natural Thorium The approved guideline values for residual contamination for release to unrestricted use for natural thorium are provided below:

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1,000 dpm/100 cm (averaged over a 1 m area) 2 2

2 3,000 dpm/100 cm (maximum in a 100 cm area if the average over 1 m is met) 2 200 dpm/100 cm (removable activity)

As interpreted by the NRC, the average 1000 dpm/100 cm and the maximum 3000 dpm/100 cm 2

2 should apply to both alpha and beta measurements, independently, for surface contamination involving natural thorium.'

Thorium emits alpha radiation to beta radiation in a 1:0.67 ratio; therefore, the corresponding average and maximum beta guidelines were adjusted to be 670 dpm/100 cm and 2000 dpm/100 cm,

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respectively, for beta monitoring.

Since the instruments cannot distinguish between uranium and thorium contamination, the most restrictive activity guideline was used to compare all direct measurements for beta activity.

Beta Guideline Values (thorium) within the Tunnel / Tunnel Annex The modified guideline values for residual contamination for release to unrestricted use for natural thorium are provided below:

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670 dpm/100 cm p (averaged over a 1 m area) 2 2

2 2000 dpm/100 cm p (maximum in a 100 cm area if the average over 1 m s met) 2 200 dpm/100 cm (removable activity)

It was GA's goal to decontaminate (as necessary) and to release the tunnels at levels < 670 p 2

dpm/100cm (thorium limit).

Exposure Rate Guideline The guideline value for exposure rates measured at 1 m above the surface, is 10 R/hr above background levels.

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3 " Interpretation of norium Surface Decontamination Limits," U.S. Nuclear Regulatory Commission, February 9,1992.

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• l* sis-monses Tunnel & Tunnel Annex (Bld. 37) Final Survey Report l

Instrumentation I

i A list ofinstruments used during the radiological surveys is shown in Table 3. The table includes:

l (1) a description of the instrument, model number and its serial number, (2) a description of the I

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.

l Background Measurements Backcround Measurements for Instmments/ Detectors Building 13 on GA's main site was used for conducting background measurements on instruments used for the final survey because: (1) there is no history involving radioactive materials or storage iI of radioactive materials in Building 13, and (2) the various surfaces found in the tunnel, its annex and respective concrete footprints could also be found in Building 13.

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For the fixed background measurements, shown in Table 4, the mean and standard deviation for each 2

surface surveyed with the 100 cm Eas flow proportional detector were calculated using equations 8-11 and 8-12 from the draft version of NUREG/CR-58492 as shown below:

Equation (8-11)

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I Equation (8-12) bi(b#)*

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Minimum detectable activities (MDA's) for each type of surface (see Table 4), were calculated using equation (5-2) from the NUREG/CR-5849 as follows:

I 2 Manual for Conducting Radiological Surveys in Support of License Tennination (Draft for Conunent),

NUREG/CR.5849, ORAU-92/C57, Oak Ridge Associated Universities, June 1992.

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• l* '""" mances Tunnel & Tunnel Annex (Bld. 37) Final Survey Report Equation (5-2) i 2.71 +4.65/B,x t(dpm/100cm *)

MDA=

i A

tuEu 100 I

Where:

Ba= background rate (cpm) t = count time (min)

E = efficiency 2

A = area of the detector (cm )

Exoosure Rate Backemund Typical exposure rate background for this site is about 15 R/hr measured at I m from the surface.

I This vah.e can be measured south of Building 15 (an office building on the eastern portion of the GA site). Measurements taken offsite in 10 different locations over a period of a year also give an average of about 15 R/hr (measured at 1 m from the surface). Normal background exposure rates increase to about 22 R/hr at 1 m from the surface in small rooms with concrete floors and walls and up to 28 R/hr inside concrete lined trenches or concrete lined pits (background measurements inside a concrete pit near Building 2 confirmed this).

Decontamination Activities I

Floor surfaces were initially wiped with masslinn cloths to remove any residual material that may have interfered with the surveys and to check for removable contamination. The masslinn clothes l

were checked with hand-held beta / gamma and alpha survey meters and the results were at or near background levels. After the masslinn cloth wipes were conducted, the floors were swept to remove any remaining dust and debris. Large area masslinn smears were taken after the floors were swept I

and the masslinns were again checked with hand-held meters, and they read at or near background levels.

I During the performance of the final surveys no further decontamination was required (other than the masslinn cloth wipes, sweeping or vacuuming) in any areas of the tunnel, the tunnel annex, or the concrete pads / footprints.

Final Surveys Performed Objectives and Resoonsibilities The objectives of the final survey plan were (1) to demonstrate that the average surface 5 of 9 lI I

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$ cus== monecs Tunnel & Tunnel Annex (Bld. 37) Final Survey Report contamination level for each survey unit were below the approved release criteria,(2) to show that the maximum residual activity did not exceed three times the average value in an area up to 100 cm,

2 (3) that a reasonable effort was made to clean removable contamination (i.e., masslinn cloth wipes) lg and fixed contamination (if necessary) and (4) that the exposure rates in occupiable locations are less j

W than 10 R/hr above background measured at I meter above the surface.

l Surveys were taken only by qualified Health Physics Technicians having a minimum of three years l

Health Physics experience in accordance with approved Survey Plans. Samples were counted in i

GA's Health Physica 1.shtory which maintains an effective QA program.

.I Every survey conducted was documented on a daily basis to a worksheet or drawing showing the Ig approximate locations surveyed. The documentation included the results of the measurements B

(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.

i Classification of Areas Non-Suspect Afected Arcas: The tunnel and the tunnel annex, used to store the properly packaged Special Nuclear Material, as well as their respective concrete footprints were classified as "non-suspect affected" areas (see Figure 3).

Final Survey Plans Survey plans were developed based on the previous history of the building, the radionuclides of I

concern, the various types of surfaces, the potential for contamination and the classification of the area (non-suspect affected).

I The surveys included scanning of the floor and wall surfaces, collection and analyses (by gross alpha / beta counting) of smears and paint samples, the taking of fixed measurements and exposure rate measurements ( R/hr).

The surveys were completed in accordance with approved written Final Survey Plans. Copies of the Survey Plans are provided in the Appendix as follows:

I Appendix:

" Survey Plan for Building 37 - South Tunnel" dated September 11,1997.

" Survey Plan for Building 37 - Tunnel Annex" dated September 16,1997.

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• l*"" "'" mumacs Tunnel & Tunnel Annex (Bld. 37) Final Survey Report Survey Summary A summary of the number of fixed measurements, smears, exposure rate measurements ( R/hr), and paint samples taken during the Final Survey is provided as follows:

Building 37 Final Survey Summary I

Survey

1. ofFixed

1. ofSmears

1. ofExposure Rate

1. ofSamples Taken Measurements Measurements and Analyzed p

(pR/hr)

Paint Final Survey 40 110 46 6

Results of the Final Surveys The results for the Final Surveys are provided in Tables 5 and Figures 6 through 14.

Scannine 2

Scans with the 434 cm alpha gas-flow proportional detectors (floor monitors) were conducted in the non-suspect affected areas in order to identify elevated areas of activity. Areas with elevated readings would then be further investigated with hand-held a instruments / detectors to detemiine if the levels were above the release criteria. No areas were discovered that displayed elevated levels of I

a activity. The results of these scans are provided in Table 5 and in the respective figures for each location.

2 Scans with the 434 cm beta gas-flow proportional detectors (floor monitors) were also conducted in the non-suspect affected areas in order to identify elevated areas of activity. Areas with elevated readings would then be further investigated with hand-held p instruments / detectors to determine if the levels were above the release criteria. No areas were discoveret that displayed elevated levels of p activity. The results of these scans are provided in Table 5 and in the respective figures for each I

location.

Scans with hand-held alpha and beta instruments / probes were conducted inside the sealed drains I

(i.e., inside walls and into the pipe openings). All readings were less than or equal to background measurements.

Fixed Measurements A total of 40 fixed beta measurements, five minutes each, were performed during the final survey in 7 of 9 I

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• l*ca p a w anses Tunnel & Tunnel Annex (Bld. 37) Final Survey Report the non-suspect affected areas (i.e., floors, walls and concrete footprints). The final measurements I

2 were taken using a 100 cm Eas-proportional beta detector. The applicable background for the 100 2

cm beta detector was subtracted from the survey readings and these readings were converted from 2

I cpm to dpm/100 cm using the appropriate count time, the efficiency of the detector and the geometry of the detector. The results are provided in Table 5 and the approximate locations are shown in their respective figures. All results were < 670 dpm/100 cm.,

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Paint Samoles Six paint samples were taken from the walls in the tunnel annex, three from the west wall and three from the east wall. Five (5) minute fixed measurements were taken on walls before and after taking the paint samples. For the "before" measurements, the maximum activity on the walls was 2

I less than the MDA of 119 dpm/100 cm. For the "after" measurements, the maximum activity on the 2

concrete walls was 251 dpm/100 cm. Survey results are provided in Table 5 and locations are shown in Figure 14. No paint samples were taken in the tunnel because the walls are bare concrete.

Removable Contamination Surveys A total of 110 smears were taken during the final survey. Removable contamination measurements (smears) were taken from the floors, the walls, and the concrete footprints.

2 Smears consisted of using a Whatman Filter Paper (4.7 cm diameter) and wiping an area of~ 100

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cm. The smears were counted in GA's Health Physics Laboratory using a Canberra 2400 low level alpha / beta counting system. The smear results are provided in Table 5 and shown in their respective I

figures. The maximum smear results were 12 dpm/100 cm a and 15 dpm/100 cm p; well below the 2

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release criteria of 200 dpm/100 cm,

Masslinn surveys vcere also conducted on all surveyed surfaces by wiping the surfaces with masslinn cloths and measuring the activity on the masslinn cloths with a hand-held 15 cm GM pancake 2

detector. All readings were less than or equal to the natural background.

I A total of 6 smears were taken inside the two sealed drains located in the tunnel's floor. The 2

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maximum smear results were 12 dpm/100 cm a and 10 dpm/100 cm. The smear results in h

2 dpm/100 cm for both alpha and beta are provided in Table 5 and locations are shown in Figure 9.

I Exoosure Rate Measurements A total of 46 direct radiation exposure rate measurements were taken at various locations inside the tunnel, its annex and the two sealed drains. The measurements were taken at ~1 meter above the surface using a microR meter. The exposure rate measurements are provided in Table 5 and in the respective figures for each location. Measurements inside the tunnel ranged from 18 to 19 R/hr.

Measurements inside the tunnel annex ranged from 16 to 23 R/hr.

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• l* CENWEAL AFWASCW Tunnel & Tunnel Annex (Bld. 37) Final Survey Report i

l Exposure rate measurements were also taken inside the two sealed drains located in the tunnel's floor. The maximum reading was 18 R/hr. The exposure rate measurements are provided in Table 4

5 and their locations are shown in Figure 9.

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Conclusion lll Final contamination and radiation surveys provided in this report for the Tunnel, Tunnel Annex and their respective concrete footprints, demonstrate that they meet the approved guidelines for release j

to unrestricted use.

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Table 1: USNRC'S' ACCEPTABLE SURFACE CONTAMINATION LEVELS 1 I

Nuclides 1 Average *d:

MaximumW Removablebd 2

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(dpm/100cm )

(dpm/100 cm )

(dpm/100cm )

I U-nat,235U,23sU, & associated decay 5,000 a 15,000 a 1,000 a products Transuranics,226Ra, 228Ra, 230Th, 22sTh, 100 300 20 I

23 p z 227Ac,125g, i29g Th-nat,232Th, "Sr, 223Ra, 224Ra, 232U,i261, 1,000 3,000 200 i331,i3:g Beta / gamma emitters (nuclides with decay modes other than alpha emission or 5,000 15,000 1,000 spontaneous fission) except "Sr and other noted above.

Where surface contamination by both alpha-and beta / gamma-emitting nuclides exists, the limits a

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 instmmentation.

Measurements of average contaminant should not be averaged over more than 1 square meter.

c For objects ofless 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,

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The amount of removable radioactive material per 100 cm 2 of surface area should be determined I

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 I

known efficiency. When removable contamination on objects ofless 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 2

2 beta-gamma emitters should not exceed 0.2 mrad /hr at I cm and 1.0 mrad /hr at I cm,

respectively, measured through not more than 7 milligrams per square centimeter of total absorber.

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I Table 2i ST TE OF CA ACCEPTABLE SURFACE CONTAMINATION L

~ LEVELS n'!

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Nuclides*

Average %

MaximumW RemovableW 2

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'(dpm/100cm )

(dpm/100cm )

(dpm/100cm )

U-nat,2nU,23'U, & associated decay 5,000 15,000 1,000 i

I products Transuranics,226Ra,22 Ra, 228Th,22:n, 100 300 20 23 ipa,227Ac, i251, i29; Th-nat, 2:2Th, "Sr, 228Ra, 224Ra, 232U,1261, 1,000 3,000 200

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Beta / gamma emitters (nuclides with decay modes other than alpha emission or 5,000 15,000 1,000 spontaneous fission) except "Sr and other noted above.

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.

Measurements of average contaminant should not be averaged over more than I square meter. For c

objects ofless surface area, the average should be derived for each such object.

d The maximum contamination level applies to an area ofnot more than 100 cm,

2 e The amount of removable radioactive material per 100 cm of surface area should be determined by 2

I 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 instmment of known efficiency.

When removable contamination on objects ofless surface area is determined, then pertinent levels should be reduced proportionally and the entire surface should be wiped.

f ne average and maximum radiation levels associated with surface contamination resulting from beta-ganuna emitters should not exceed 0.2 mrad /hr at I cm and 1.0 mrad /hr at I cm, respectively, 2

2 measured through not more than 7 milligrams per square centimeter of total absorber.

Guidelines For Decontammation of Facilities and Equipment Prior to Release for Unrestricted Use or Termmation of Licenses For byproduct, Source, or Special Nuclear Material, also known as "Decon-1" incorporated into GA's State of CA Radioactive Materials License.

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-Table 3: List ofInstruments Meter.

Detector Detector :

Calibration.

Efficiency-Range' Background <

Description S/N S/N1 Due Date -

. (cpm)

(cpm).

Ludlum Rate Ludlum 83265 01-06-98 20.30 %

Four Linear See Table 4 He instrument is a gas-flow proportional counter with an active probe Meter Model Ranges 2

area of 434 cm. He detector and rate meter are combined and Model 2221 43-37 0-500,000 mounted on a roll around cart. He instrument features a static-flow 2

S/N 73701 434 cm system, quick connects, a portable gas bottle And a means to adjust the Beta One Log height of the detector from the floor for optimum performance. Used 50 500,000 for sca: ming.

Ludlum Rate Ludlum 88238 01-06-98 20.21 %

Four Linear See Table 4 He instrument is a gas-flow proportional counter with an active probe Meter Model Ranges area of 434 cm. He detector and rate meter sre combined and 2

Model2221 43-37 0-500,000 mounted on a roll around cart. He instrument features a static-flow S/N 97287 434 cm2 system, quick connects, a portable gas bottle And a means to adjust the Alpha One Log height of the detector from the floor for optimum performance Used 50-500,000 for scannmg.

Ludlum Rate Ludlum i19444 02-23-98 34.98 %

Four Linear See Table 4 He instmment is a gas-flow proportional counter with an active probe 2

Meter Model Ranges area of 100 cm. He detector and rate meter are combined and Model 2221 43-68 0-500,000 mounted on a roll around cart. The instrument features a static-flow S/N 84423 100 cm2 system, quick connects and a portable gas bottle. Used for takmg fixed Beta One Log measurements.

50-500,000 Ludlum Ludlum 89920 11-19-97 21.89 %

Four Ranges 0-5 Alpha scintillator ZnS(Ag) with an active probe area of 50 cm.

2 Model 12 Model 0-500,000 S/N 72676 43-65 50cm2 Alpha Ludlum Ludlum 94052 01-21-98 21.58 %

Four Ranges 0-5 Alpha scintillator ZnS(Ag) with an active probe area of 50 cm.

2 Model 12 Model 0-500,000 S/N 91078 43-65 2

50 cm Alpha T-3

m num man imm suu uma sus iam Mai suur sus muu aus iam uma las Table 3: List ofInStrumentS Meter -

Detector Detector -

Calibration Efficiency.

Range

Background

Desenption LS/N -

S/N

. Due Date

(epm)

(cpm) -

Ludlum Ludlum N/A 10-27-97 28.35 %

Four Ranges Concrete His instrument is used for beta / gamma surveying. He detector has an Model 14A Model 44-9 0-500,000 60-140 active probe area of 15 cm -

2 S/N 83454 15 cm2 Metal Beta 40-100 Ludlum Ludlum N/A 01-07-98 22.18 %

Four Ranges Concrete His instrument is used for beta / gamma surveying. %e detector has an Model 14A Model 44-9 0-500,000 80-160 active probe area of 15 cm.

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S/N 83842 15 cm Metal Beta 60-140 Ludlum RCA 6199 N/A 12-18-97 N/A Five Ranges 10-18 pR/hr Used for measuring extemal dose rates on the surface and at one (1)

Model 19 coupled to a 0-5 mR/hr meter from the surface (i.e., initial gmund floor surveys). %e S/N 101758 Nal(TI) scintillator (1"x1"] NaI(T1) is mounted internally.

Scintillator t

Ludlum RCA 6199 N/A 09-24-97 N/A Five Ranges 10-18 pR!hr Used for measuring external dose rates on the surface and at one (1)

Model 19 coupled to a 0-5 mR/hr meter from the surface (i.e., initial ground floor surveys). The S/N 87120 Nal(TI) scintillator [l"xt "] NaI(TI) is mounted intemally.

Scintillator Canberra Gas Flow N/A As needed

~26-36%

N/A Varies with Canberra Model 2404 Low Level a/p gas prr.gortional counting Low Level Proportional Sample system used to count wipes for removabk contammation. Results are a/p Counter Counter usually reported as dpm/100 cm,

2 Model 2404 T-4 t

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Table 4: Background Measurements (obtained from Building 13) g Ludlum Model 2221 Rate Meter s/n 73701.with Model 43-37 probe s/n 083265 E

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' 434 cm Beta Detector'(Emciency = 21.85%) -

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. Background Material

-: Beta / Gamma Scan Range (cpm) l Concrete Block 1281 - 1554

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Concrete 1795 - 2030 Drywall 906 - 1050 Ludlum Model 2221 Rate Meter s/n 84423 with Model 43-68 probe s/n 119444 2

100 cm Beta Detector (Emciency = 35.50)

Background Material Average of10

.MDA

-Measurements at -

(dpm/100 cm )

2 5 minutes each (cp5m

• 20)

Concrete 2025 46 119 Metal 1211 60 93

- Ludium Model 2221 Rate Meter s/n 97287 with Model 43-37 probe s/n 088238 2

434 cm Alpha Detector (Emciency = 20.21%) -

Background Material' Alpha Scan Range (cpm).

Concrete 0-20 a

Drywall 0-15 I

Concrete Block 0-20 1

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- Table 5: Results'of Final Survey Building 37 Tunnels

1. Fixed S 3 J Maximum Scan Resuha Scan Results

1. of:-

Mamlamm Result.

. Exposure Figure # :

Location '

Measurements -

p Result :-

434 cm' a '

434cm'p' Smears

. (dpm/IM cm').

.1 Rate Range 2

(100 cm detector)

(dpm/lW cm')

(cpm range) :. (cpm range)

(pR/br);

.a ~

S; Tunnel Floor 15 278 4-41 982-1542 13

<10

<10 18-19 East Door Footprint i

126 3-36 1242-1565 1

<10

<10 North Door Footprint I

<MDA (119) 0-27 935-1363 1

<10

<10 6

h East Wall (<2m) 0-38 1083-1541 10

<10

<10 8

West Wall (<2m) 2-42 1104-1528 10

<10

<10 t

North Wall 5-29 875-1510 2

<10 13 i

South Wall 3-32 1073-1521 2

<10

<10 Scaled Floor Drains 6

12 10 18 l

9 2

2 Scans Inside Drain Opemng a scan using 50cm detector, no activity detected; p scan using 15 cm detector s background.

and into Drain Line 8

East Wall Stmetures 10

<10

<10 9

West Wall Structures 5

<10

<10 Tunnel Anner 10,12,13 Floor 9

356 0-30 1117-1593 6

<10 10 20-23 T-6

m imm Ems agus sus en spE EEE EIN EEE EM EEE m

Table 5: Results of Final Survey Building 37 Tunnels -

~

1. Fixed p 1 Maximum Scan Raults Scan Results i# er -

} Maximum Result

. Exposure Figure #.

- Location Measurements.

p Rault 434 cm a'-

434 cm' S Smears (dpm/100 cm') L

.. Rate Range 2

2 r

(100 cm detector)

(dpav100 ca )

(epm range).

(cym range) -

~

~ '

(pRAr).

-a.

10,12,13 Stair Landing and 2

268 0-26 904-1433 2

<10

<10 16-20 North Door Footprint 10,12 East Wall (<2m) 4-29 953-1257 5

<10

<10 East Wall before Paint Samples 3

<MDA (119) 14 East Wall Paint Samples 3

<10 15 East Wall After Paint Samples 3

251 10,12 West Wall (<2m) 3-32 1098-1303 6

<10

<10 West Wall Before Paint Samples 3

<MDA (119) 14 West Wall Paint Samples 3

<10 10 West Wall After Paint Samples 3

204 East Wall Ledge 6

<10 10 11 (liorizontal Surface) 2 2

a scan using 50cm detector, no activity detected; p scan using 15 cm detector s background.

12 East Wall Stmetures (>2m) 9

<10

<10 10,12 North Wall (<2m) 0-28 1019-1434 2

<10

<10 10,12 South Wall (<2m) 0-29 962-1397 2

<10

<10 T-7

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Figure 6: Tunnel: Alpha and Beta Scan Results 6

SL 4 5

Floor Scans f

ocpm-27 cpm a East, Concrete Footprint t

83*I383CP* 0 7com.34 cpm a 4 cpm 1 cpm a 6 cpm-39 cpm a 5 cpm p f

-4

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A -- m-~7-g-

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x s

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x North Concrete Footprint 3 cpm-32 cpm a Wall Scans 1073 cpm-1521 cpm p Ocpm-38 cpm a 2 cpm 2com a Sepm-29cpr i a

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'A4 Notes:

1.

Survey Results are provded in Table S.

2.

Scan results (cross hatched areas) for a and D.

3.

A 100% Scan was performed on the Footprht areas.

4.

The walls were scanned from the ground up to 2 meters above the ground.

I 5.

Large Area Masslinn wipes were taken on all surveyed surfaces before survey was started. No activity above background was detected.

6.

All concrete surfaces.

f

W W

W W

M W

W W

W W

W W

W W

W W

W Figure 7: Tunnel: Fixed Beta & Exposure Rete Measurements 4

DL Fixed Measuremeris 0 - Locatio i or Fix o measureme its v

'*O Footonnt measurement r7

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measur2 ment Exposure Rate Measurements N

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15 pit /hr 19 pRh 19 pR/hr 19 pR/hr 19 pR/hr 19 kR!hr 19 pR/hr 19 pR/hr 19 pR/hr 19 R!hr 19 pR/hr 19 pRh 19 pR/hr 19 pR/hr 19 pR/hr N

\\

18 pR/hr 19 pR/hr 19 pR/hr 19 pR/hr 19 pR,nr 19 pR/hr 19 pR/hr 19 pR/hr 19 pR/hr 12 pR/hr 19 pR/hr 19 pR/hr 19 pR/hr 19 pR/hr 19 pR/hr ~

Notes:

1.

Survey Results are provided in Table 5.

2.

The sq/ ares are the approximate locations of the Fixed Measurements. The Exposure Rate Measurements are as shown 3.

Five minute (cp5m) fixed p readings were taken using a 100cm Detector.

2 4.

Large Area Masslinn wipes were taken on all surveyed surfaces before survey was started. No actmty above background was detected.

5.

All concrete surfaces.

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M Ml Figure 10: Tennel Annex: Alpha and Beta Scan ResuP.s v

54 bin Scan Results on Fknr & Outside Concrete Stabs T

5 I

lh oaxn-26qwn a O cpm-27 cpm u 2 cpm-30 cpm a icpm-29 cpm a i &j,-

N'433C8"" C g

1152 cpm-1521 cpm p 1298 cpm-1562 cpm p 1117 cpm-1593 cpm p i'3y t

1 4

wmmmmmmmwmv -

gg A wex - wsm

" ' Anummmmmmmmsmmmmmmmmm. mammmmmwnwammmm:.1' i-pA 3

Scan ResuRs on Wans (2 Meters up 100% Scan)

Oepm-2m a 3 cpm Ucoma 101 1434 cpm p 1098cpn* M3 cpm p s

ocom-29com a j -

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3 4 cpm-29 cpm a 953 cpm-1257com p Notes:

1.

Survey resuRs are provided in Table S.

2.

AB Scan (cross hatched areas) resuRs for a and D.

3.

A 100% Scan was performed on the outside door area (North Concrete Footpnnt).

4.

The walls were scanned from the ground up to 2 meters above the ground (100% Scan).

5.

Large Area Masslinn wipes were taken on sH surveyed surfaces before survey was started. No activity above background was deteted.

6.

All concrete surfaces.

te'"

/

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h 4

5

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W Figure 12: Tunnel Annex: Removable Contamination Locations 1D 54 W EL Removable Contamination Locations on Floors & North, South & West Walls

^ g V

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Notes:

1.

Survey results are provided in Table 5.

O-Approximate iocations and io a of toocm wipes taken on Floors, Watts, Angles, Ledges & Metal Box.

2.

2 3.

Large Area Masslinn wipes were taken on all surveyed surfaces before survey was started. No activity above background was detected.

4.

Concrete and Metal Surfaces.

S E

E E

E E

E S

E E

E E

E E

Figure 13: Tunnel Annex: Fixed Beta & Exposure Rate Measurements 10

&4

'JL Fixed Measurements O = ~ tocaeon of Fired A4peswoments on re Socr Y

6 i

I A

N N

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i Exposure Rate Measurements l

!I) p.

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's

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's Notes:

1.

Survey results are provded in Table 5.

2.

Numbers are the approximate locations and results of Exposure Rate Measurements.

3.

Squares are the approximate locations for five minute (cp5m) fixed p readings using a 100cm Detector.

2 4.

Large Area Masslinn wipes were taken on floor surfaces before survey was started. No activity above background was detected.

5.

All concrete surface.

h am

W W

W W

M M

M M

M M

M M

M M

M M

M M

M Figure 14: Tunnel Annex: Paint Sample Conection v

&4 v 'JL V

6 ih

\\

Wan Wau iN Wat 3 i Meter above noor t ueter above noor 1 g

5 t ueiw atxm nwr g'

s \\ex 2%

E" N...

( p.

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z=_-

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1 Meter above noor 4 1 ueter above noor i Meter m noor 2

' 2 ! :-

h an s

Notes:

1.

Survey results are provided in Table 5.

2.

= approximate locations of Paint Samples taken.

3.

Five minute (cp5m) fixed p readings were taken, before Paint Chips were removed & After Paint Chips were removed,

~1 meter above the floor using a 100cm Detedor.

2 4.

All concrete surface.

E I

- Appendix to Final Radiological Survey Performed at General Atomics' Building 37 Non-Suspect Affected Areas l

Tunnel and Tunnel Annex I

dated February 1,1999 I

I l

I

" Survey Plan for Building 37 - South Tunnel" E

dated September 11,1997 I

I

" Survey Plan for Building 37 - Tunnel Annex" I

dated September 16,1997 I

I

I I

l Survey Plan for Building 37 - South Tunnel (2214 ft floor area)

// 77 2

[Q[. W8.

Type of Survey B-37 South Tunnel History of use Storage of SNM and Source materials in sealed containers l

Gridding Not Required Floor Scan a - 46%

Yes (See Figure 1A)

Floor Scan

~ 46%

Yes (See Figure 1A) l Outside North and Yes East doors a 100%

l Outside North and Yes East doors p 100%

Lower Walls a ~ 22%

Yes I

! Nis)

Lower Walls P ~ 22%

Yes I

(

1B)

Upper Walls No Fixed Measurements (17) 15 Floor (See Figure 1A) 1 Outside East Door l

1 Outside North Door Paint Samples No g

(All Bare Concrete Surfaces)

Smears (49) 15 Floor (every Sm)

I 10 East Wall 10 West Wall 2

North Wall I

2 South Wall 10 Structural Elements

1. of MicroR Readings 30 I

(See Figure 1C)

Floor Drains No Total # of Measurements 61 (Rxed Measurements & smears)

I I

North Door N+

4-73.4m -*

.-5m-

\\

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

\\\\

\\ \\ \\ \\ \\\\ \\

\\

k i

X X

X X

X

~

2.8m

\\ \\ \\ V \\ \\ \\ \\ \\ \\ Y \\ \\ \\ \\ \\ \\ V\\ \\ \\ \\ \\ \\ \\x\\ \\ \\ \\ \\ \\ \\A \\, \\ -

y X

X X

x 4

\\\\\\\\\\\\

\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\'\\ \\ \\ \\ \\ \\ \\ \\ \\

East /

\\

Area Scanned for Alpha and Beta Radiation [ \\ \\ \\ \\ \\l

\\

Door (Each scan path 1T wide)

'\\

. Location of Fixed Measurements.X.

h FIGURE 1A. Floor Scan and Fixed Measuremer.ts B-37, South Tunnel n

(NOT TO SCALE) l l

4-73.4m

-+

N+

t 3.37m 1

\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\

Area Scanned for A!pna md Bets Radiaton k \\ \\ \\ \\ \\ l I

Along Bottom of V.ait. (scan path 1T wide)

FIGURE 18. Lower Walls Scanned B-37, South Tunnel I

(NOT TO SCALE)

E 4-73.4m

-+

.- 5m -

N+

I t

2 E

.8m 4

• Location of MicroR Readogs e

FIGURE 1C. MicroR Readings on Floor B-37, South Tunnel (NOT TO SCALE)

FIGURE 1. BUILDING 37, SOUTH TUNNEL (NOT TO S('Al F)

_. _. _ _ _.. _... ~. _ _ _

I 4

Survey Plan for Building 37 - Tunnel Annex (867 ft floor area) g/f 4/79 2

Type of Su?vey B-37 Tunnel Annex Odd M4 W History of use Storage of SNM and Source materials in sealed containers Gridding Not Required Floor Scan a ~ 53%

Yes (See Rgwe 1A)

~ 53%

Stairlanding inside a 100%

Yes North door p 100%

Floor 2m outside a 100%

Yes

l l

North door p 100%

Lower West wall a - 22%

Yes (bottom 2 m) (See Figwe 1B) p ~ 22%

Lower East Wall a - 39%

Yes

<s.e now ic) p ~ 39%

East Wall a - 10%

Yes (Using hand held meters)

Ledge p ~ 10%

1I Upper Walls Na g

Fixed Measurements (20) 6 Floor ig (Sw Rgwe 1A) j 3tglr lgndjng j

i 1 Outside North Door 12 Wa'Is (borare and enn paint umpling)

Paint Samples 3 Westwall 3 East wall Smears (28) 6 Floor (every Sm) 6, East Wall I

6' East Wall Ledge 6 West Wall 2

North Wall 2

South Wall

1. of MicroR Readings 14 (see n we 10) e Floor Drains No j

I Total # of Measurements 48 (Fhed Measurements & Smears)

I I

Stair Landing

• l 1'1m

+-

30m

-+

l 5m.

outside j

l 1 xx x x x x x x x x x x xxx N N,

N x N \\

A N/

N N N N X N N N N N N N xx x xx x s s y

g\\

\\ \\ \\ \\ \\ \\ \\ \\x\\ \\ \\ \\ x x s s s

~

s ij g N+

Area Scanned for Alpha and Beta Radia5on Stairs Location of Fixed Measurements 2.

q

\\

/-

(Each scan path 17' wide) y l

FIGURE 1 A. Floor Scan and Fixed Measurements B-37 Tunnel Annex 8

1. 8 (NOT TO SCALE)

+-

32.3m

-+

t l

3.4 m N +-

4

\\ _ N_

_\\

\\

\\

\\

\\

\\

\\ \\

\\ \\

N N N

N N N"'

I Area Scanned for Alpha and Beta Radiation Along Bottom of West Wall (Scan path 17' wide)

FIGURE 18. Lower West Wall Scanned B-37 Tunnel Annex (NOT TO SCALE)

I

+

1.gm xxx x x x, x

x x.

x x x x

x

\\

x - \\

x N+

e 32.3m 4

Concrete up 1.09m metal above Area Scanned for Alpha and Beta Radiation Along Bottom of East Wall (Scan path 17" wide) b \\

^

FIGURE 1C. Lower East Wall Scanned B-37 Tunnel Annex g

(NOT TO SCALE)

~

l g.

q

. w.

N+

5m-Location of MicroR Readings e

FIGURE 1D.. MicroR Readings on Floor B-37 Tunnel Annex (NOT TO SCALE) i FIGURE 1. BUILDING 37 TUNNEL ANNEX (NOT TO SCALE)

I