Text

Decontamination of Selected General Atomics Science Labs for Release to Unrestrictive Use (Group 3)
	ML20248B376
Person / Time
Site:	07000734
Issue date:	12/21/1988
From:	; GENERAL ATOMICS (FORMERLY GA TECHNOLOGIES, INC./GENER
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DEC3f!' MINATION CF SEIECTED GENERAL AitMICS' A

l SCIENCE IABORA70 RIES HR RELEASE

'IO UNRESTRICTED USE (Group 3) r+: 2er 21, 1988

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i TABLE OF CCNIDfrS Pace l

l LIST OF ATTACHMENTS....................................... i l

l IlfNiiCN.............................................. 1 SITE DESCRIPTICt3,.......,.................................. 2 CRI'IERIA ETR RELFAT 10 UNRESTRICTED USE.................. 3 INSTRUMENTATION AND MEASUREMENT IJMITS FOR REI. EASE........ 4 PREVIOUS LABORATORY ACTIVITIES AND EFFORT OF DECONTAMINATICH RErCIRED.......................,... 6 FINAL RADIATICH SURVEYS................................... 9 FINAL CCNIAMINATION SURVEYS.............................. 10 OCMPLIANCE WITH THE TAMET CPlTERIA..'.................... 11 C%NCLUS IQ4.............................................. 11 l

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w LIST CF ATDCHMCNTS Attehmarit 1:

Plan View of Site :

Building 2 Conplex~ (Science laboratories Building) :

-Selected Science Labs (Group 3) to be Released to Unrestricted Use A:

Table I Guidelines fcr Release of Equipnent and-Facilities to Unrestricted Use (NRC)

Att ehmant 4B:

Table I Guidelines for Release of Equipnent and Facilities to Unrestricted Use (State of California I

Decon-1)

Att ehmant 5:

Final Radiation Survey of Lab 234 Attehmant 6:

Initial Survey of Cm bi mi Labs 321/323 Att ehment 7:

Final Survey of Canbined Labs 321/323

-1 Att e hmant 8:

Final Survey of Enmhimi Mezzanines above Labs 321/

323/325/327 At* e hmant 9:

Final Survey of Lab 327 At+ e hmant 10:

Final Survey of Canbined Imbs' 343/345 and Lab 347 Attehmar t 11:

Final Survey of Combined Mezzanines above Iabs 335, 337,.

i 339, 341, 343, 345, 347 and 349 2:

Final Survey of Cambined Labs 425/427/429 Atte h" ant 13:

Final Survey Cambined Mezzanines above Labs 425, 427, and 429 4:

Final Survey of Cambined Labs 431/433 Attachnent 15:

Final survey of Cambined Hezzanines above Iabs 431 and 433 6:

Final Survey of Cambined Mezzanines above labs 615/617 7:

Final Survey of Iabs 647, 649, 651 and cambined l

Mezzanines above labs 645 and 647 l

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Contamination Survey Results (6 pages) i l

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INTRODUCTION General Atomics has been involved in the process of decontaminating and obtaining the release to unrestricted use of selected laboratories and associated offices in GA's Building 2 (also known as the Science I. laboratories Building). Thirty-eight (38) such laboratories were released.-

l earlier this year in two groups designated as " Group 1" and " Group 2".

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Group 1 involved the release of twenty-five (25) laboratories and Group 2 involved the release of thirteen (13) laboratories.

GA has recently decontaminated another group of laboratories in Building 2.

This group consists of fifteen (15) laboratories (12 of these laboratories have mezzaninaa) and nine (9) other mez=ninas located above laboratories which are not being released at this time. These later laboratories are currently occupied; however, none of the activities R

involve the use of raditwtive material. This group of laboratories and associated offices is designated as " Group 3".

GA has no plans for conducting any future activities involving radiewtive materials in these laboratories and/or mezzanines included in " Group 3" and would like to lease same, or all, of these laboratories to outside mmanies. The offices across the hall fran these laboratories which have never been used for work involving radioactive materials may also be leased to outside companies. Accordingly, GA is requesting the release of these laboratories and/or mezzanines and their associated offices to unrestricted use.

The 15 laboratories (12 have mezzanines) and 9 other mczzanines in 2

" Group 3" consist of a total area of about 8704 ft to be released to~

unrestricted use. A brief history of the use of these laboratories is provided. The primary radionuclides previously used in these laboratories were Cs-137, co-60, thorium and depleteJ, natural or enriched uranium.

Only one laboratory (Lab 323) required decontamination beyond the removal / decontamination of sources and contaminated equipment (including-drMn pipes, hoods, filter plenums and associated ducting). This involved 2

the scabbling of about 20 ft of concrete on the floor and the wall of lab 4

-_.-_____.--._----...-----.-_s

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t 323. The primary contaminants found during the decontamination efforts i

were Cs-137 and uranium (including U-235).

GA has decontaminated equipnent and facilities consistent with the State of California's and U. S. Nuclear Regulatory Comission's guidelines for Release of Facilities and Equiptent to Unrestricted Use.

The results of the final radiation and contamination surveys are included in this report to demonstrate compliance with the guidelines.

SITE DESCRIPI'IOti The location of mileling 2 with respect to other facJlities on the GA Site is shown in Attachment 1.

A layout of Building 2 is shown in Attm h nt 2.

The building is divided into three Laboratory sections; Iaboratory B, C, and A.

Laboratory B includes offices and laboratories fram 102 through 243. Iaboratory C includes offices and laboratories frun 300 through 445 and laboratory A includes offices and laboratories fram 502 through 651. The laboratories and mezzanines to be released to unrestricted use in Group 3 are located in all three of the laboratory sections as shown in Attachment 3.

The fifteen (15) laboratories.s are 234, 321, 323, 327, 343, 345, 347, 425, 427, 429, 431, 433, 647 649 and 651 and the 12 mezzanines above some of the labs which are also being released are 321, 323, 327, 343, 345, 347, 425, 427, 429, 431, 433, and 647.

(laboratories 234, 649 and 651 do not have mezzanines.) In addition, nine (9) other mezzanines are also being released in " group 3".

These mezzanines are above labs 325, 335, 337, 339, 341, 349, 615, 617, and 645. The lcbs below these mezzanines are not being released to unrestricted use at this time because they are l

currently occupied. They are not being used for work involving l

radioactive materials and there are no plans to use radioactive materials in them in the future.

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2 The wwdmate area in ft is presented below:

Laboratory / Mezzanine Approximate ft-Lab 234 (This lab does not have a mezzanine) 336 Lab 321/323 (Ccaubined Labs) 552 Mezzanines above Iabs 321/323/325/327 720

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Lab 327 288 Labs 343/345 and Lab 347 864 Mezzanines above Labs 335/337/339/341/

343/345/347 and 349 1440 rabs 425/427/429 1008 Mezzanines above Labs 425/427/429 504 Labs 431/433 (Cambined Labs) 672 Mezzanines above Labs 431/433 448 Mezzanines above Labs 615/617 416 Labs 647, 649, 651 and Mezzanines 645/647 1456 (Labs 649 and 651 do not have mezzanines)

'IUIAL 8704 CRITERIA FOR RELEASE 'ID UNRESTRICTED USE Table I (Attachment 4A) is taken from USNRC's criteria for releasing facilities and eqaignent to unrestricted use.

It has been incorporated into our SNM-696 license. The State of california's limits for release of facilities and equipment to unrestricted use are identical to these limits for the radionuclides of concern (predominantly U-238, Cs-137, U-235 and Co-60). These guidelines, "DHS Criteria for Release of Facilities and Equi 2nent to Unrestricted Use," are also known as "DECON-1" are summarized l

in Table I (Attachment 4B). GA has decontaminated the laboratories and l

selected mezzanines to levels below these guidelines.

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t INSTRUMENTATION AND MEASURDENT LIMITS FOR REMASE Instnmentation 1.

Beta /gama counters - Model TBM 28 geiger counters manufactured by Taehn4 cal Associates were used to survey surfaces for beta /ganma contamination. The instruments contain a p neaka Geiger-Mueller (GM) 2 l

detector which has a window thickness of less than 7 mg/cm. The l

ine^uunaut has three ranges covering from 0-50,000 counts per minute (cpn). The instmaents are calibrated semiannually using a Cs-137 standard or a pulser.

2.

Alpha counters - Model 12 rate meterF with Model 43-44 air pwgri.ional alpha probes manufactured by Ludlum Measurements Inc.

were used to survey for alpha contamination. The instrument has four ranges covering frcxn 0-500,000 counts per minute. Alpha counters are calibrated using an alpha source traceable to NBS.

I 3.

Gantua Detectors - Model 19 microR meters with NaI scintillation detectors manufactured by Ludlum Measurements Inc. were used in all locations. The in=^uwinut has three ranges from 0 - 5 mR/hr. The microR meters are normally returned to the manufacturer for I

calibration annually. Gamna spectral analysis on selected samples were performed using a high purity germanium detector manufactured by l

Canberra Industries, Inc.

l 4.

Ir.u level Alpha / Beta counting systems manufactured by Canberra were used to analyze wipe samples.

The alpha / beta systems and the germanium detector system has been calibrated for various type of samples. This calibration is checked on a daily or weekly basis dapaneling on usage.

i Measurement Limits for Release The final survey results have been converted from cpn (counts per I

2 minute) for a particular detector to dyn/100 cm by correcting the counts l

per minute observed by an appropriate detector for background, detector 4

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I efficiency and M h ic factors associated with the instrumentation.

===1.

Background===

A " standard" natural background was determined for each instrument and subtracted frczn the survey readings. The surface beta /ganma readings were ccrupleted using the TBM Model 28 G4 counters which have a background concrete reading of 80 plus or minus 20 counts per minute.

2.

Efficiency The primary contm inants found during the decontamination efforts were Cs-137 and uranium.

Only one laboratory (Lab 323) required decontamination beyond the removal / decontamination of sources and contaminated equipuent (including hoods and associated ducting and filter plenums). The concrete floor of lab 323 was found to be contaminated with Cs-137.

l 2

An area of about 20 ft was scabbled until the contamination levels met the release criteria in Table 1 (Attachments 4A and 4B). An NBS traceable standard was used to calibrate instruments for Cs-137 efficiencies. The standard consisted of a concrete block having an i

area of approximately 25 cm x 25 cm spiked with an NBS traceable standard ligaid solution of Cs-137. The maximum allowable level is 2

15,000 dpn for an area less than 100 cm and the average allowable

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2 level for an area 1 meter by 1 meter of less is 5000 dpn/100 cm (Attachments 4A and 4B). Surface measurements of the blocks were obtained with the instruments and percent efficiencies were obtained.

The readings were corrected for efficiency by multiplying by the appropriate correction factor.

The hood in laboratory 433 was contaminated with uranium (including U-235) and was cleaned to background levels (background levels of both beta / gamma and alpha detecting instruments). Therefore, instrument efficiencies were not needed.

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2 De values listed in Table 1 are in dpm/100 an, therefore, a correction factor was applied to the values to correct for the smaller area of the detector for the Cs-137 contaminated areas. The TBM-28~

(geiger counter) has a 5 cm diameter detector which measures a 19.6 cm area. ' The raariing is cvit cLed by Intltiplying by 5.1.

PREVICXJS LABORA'KRY ACTIVITIES AND EFICRT OF 20CNTAML(ATION fuivuuum Initial Survey Ja initial beta /genena survey was conducted during and after the runoval of all vi,==nt (including the hood,. filters, plenums and -

associated ducting) to deramina the extent of the r='=4ning contamination and the radionuclides present.

%ese surveys inrite**M that only one laboratory (lab 323) was contaminated beyond the runoval of sources and equipnent (including drain-pipes, hoods,. filters plenums and associated ducting).

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The total area of these laboratories is 8704 ft but only about 20 2

ft required decontamination beyond the cleanup of hoods and removal of all contaminated equipnent.

The cleanup effort involved washing of floors, renoval of floor l

tiles, removal or cleanup of hoods, associated plenums and ducting and the 2

2 scabbling of about 18 ft of concrete on the floor and about 2-ft of concrete brick from the wall of lab 323.

Every reasonable effort was made to eliminate residual contamination.

No covering was applied to the contaminated surfaces of equipment or-I structures such as paint, plating etc. The floors of all'the other:

laboratories were washed, surveyed and found to be free of contamination.

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A brief description of the previous use of the 13 laboratories over the past approximately 20 years is provided below.

Lab 234 (Lab does not hwe a mezzanine)

This lab had been used for X-Ray diffraction of samples containing Uranium and Thorium as well as for X-ray diffraction of sanples containing up to 1 nci of mixed fission products. The sanples were prepared in other radiochemistry laboratories and then transferred to this laboratory for X-ray diffraction. No contamination was detected in this laboratory.

Labs 321 and 323 These laboratories had been used for work involving mixed fission products many years ago. After the remval of all sources and contaminated equipt, an initial survey was canpleted (see ). All values are provided in cpn (beta / gamma contamination) using a technical associates nodel TBM-28 GM counter.

Contamination was found on the floor and one wall of laboratory 323.

Ganma scans of concrete chips remved frun the floor showed Cs-137 to be the only conteinant. The floor was cleaned and an area (about 20 2

ft ) was scabbled until the contamination levels met the release criteria in Table 1 (Attachments 4A and 4B). The mezzanines had no contamination but a few radioactive sanples (i.e. metal, plastic) were disposed of as radioactive waste during clean up of the lab.

l Lab 327 No record of work involving radioactive material exists for this lab.

No contamination was detected.

Mezzanines above Labs 325 and 327 Ducts in the mezzanine above laboratory 327 were labeled " Caution Radioactive Material" but no contamination was detected. The ducts were removed and released to unrestricted use. There were no records of any Wark Authorizations for this laboratory. No contamination was detected.

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Labs 343/345 and Lab 347 and Mezzanines above Labs 335, 337, 339, 341, 343, 345 and 347 l

W rk involving rad % ctive material has not been conducted in these laboratories since 1974 at which time a E rk Authorization for X-ray i

analysis of samples containing uranium and thorium was in existence for laboratory 339. The X-ray machine was located in the lab 335 mezzanine but did not appear to have been operated. The X-ray machine is currently being stored in another facility.

During the surveys a few itens were found to be contaminated.

In the mezzanine above lab 341, a part used for a milling machine had contamination up to 300 counts per minute (CM reading). The part was transferred to the Hot Cell Facility. A bottle of thorium was found in lab 343 and was transferred to the raai m h mistry laboratories.

In aMition, a sheet of material containing thorium was found in the service core cabinet and disposed of as radioactive waste. No contamination was detected on the floors or walls of these laboratories and/or mezzanines.

Labs and Hezzanines above labs 425, 427, and 429 Between 1974 and 1976, tests of the thermal and physical properties of fuel particles were conducted in these labs.

In 1977, densitometry of fuel rods was also conducted. An isolated plenum in laboratory 429 was found to have minor contamination on the door i

gaskets. These gaskets were removed and disposed of as radioactive waste. The plenum and associated ducting were not contaminated but were removed and transferred to another location. An internally contaminated drain pipe which had been capped off on both ends was also removed and disposed of as radioactive waste. Minor 1

1 decontamination of the floor was required following removal of the j

drain pipe. The cont minants were not identified but the floor was

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imediately cleaned to background levels.

Labs 431/433 and Mezzanines above the labs i

Until a few months ago, these laboratories had been used for fuel l

development work. Uranium of varying enrichments, thorium, and small l

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i amounts of mixed fission products were used in these laboratories.

f After removal of all sources and contaminated equipnent a survey showed only the hood in Lab 433 was contaminated with uranium (including U-235). The hood was cleaned to background levels.

Mezzanines above labs 615 and 617

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There was no record of radioactive material use for these labs / mezzanines over the past 20 years. No contamination was detected.

j Laboratories 647, 649, and 651 and Mezzanine 645/647 There was no record of radioactive material use for these labs / mezzanines over the past 20 years. No contamination was detected.

I FI1UL RADIATICN SURVEYS I

Finc.1 surveys of all laboratories and selected mezzanines were i

conducted using the TBM-28 G4 counters. The measurements of average l

contamination were averaged over 1 meter and are given in dpu/100 cm.

The mwimm contamination level applies to an area of not nore than 100 2

The results of these surveys are shown in Attachments 5 through 17 cm.

as described below. :

Final Radiation Survey of Lab 234 :

Initial Survey of Combined Iabs 321/323 :

Final Survey of Cambined Labs 321/323 Final Survey of Cambined Mezzanines above Labs 321/

323/325/327 :

Final Survey of Lab 327 At w hment 10:

Final Survey of Cambined Labs 343/345 and Lab 347 Attehmant 11:

Final Survey of Cambined Mezzanines above Labs 335, 337, 339, 341, 343, 345, 347 and 349 2:

Final Survey of Combined Labs 425/427/429 9

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Final Survey remhinad Hezzanines above Iabs 425, 427, and i

429 Attach =nt 14:

Final Survey of Ccubined Iabs 431/433

-Attach =nt 15:

Final survey of Cambined Mezzanines above Labs 431 and 433 Atteh=nt 16:.

Final Survey of cemhtnad Mezzanines above labs 615/617 Atteh=nt 17:

Final Survey of Labs 647, 649, 651 and canbined Mezzanines above labs 645 and 647 1

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A microR meter was also used to survey the laboratories and to measure I

radiation levels. The final surveys show the measurements obtained at one meter above the surface. These levels were all within normal background levels.

Alpha counters were also used to survey the laboratories. The beta /ganna levels were used to determine allowable release levels for the Cs-137 contaminated areas and the uranium contaminated areas were cleaned to beta /gadma and alpha bachwimi levels.

FINAL CCtg' AMINATION SURVEYS Table 1 (Attachments 4A and 4B) provides limits for acceptable removable surface contamination levels. Although the type of l

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decontamination efforts (i.e. washing, scabbling and vacuuming) conducted in these laboratories eliminates the probability of removable l

contamination, a wipe survey was conducted. These wipes were collected primarily on the floors of the laboratories. The wipe sample locations are shown in Attehmnts 5 through 17 and the results are shown in Attache nt 18. The contamination levels in every location were ( 20 j

dpn/100 cm area, and well below the Table 1 limits (Attachent 4A and 4B) for removable contamination.

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CpMPLIANCE WIN THE TARCET CRITfRIA The laboratories were cleared of all rM4mdive materials and contaminated equipment. Drain lines, hoods, filter plenums and associated ducting was either decontaminated to natural background levels or disposed of as rMimetive waste.

All floors, walls and concrete surfaces were also decontaminated below the release levels specified in Table 1 (Attehent 4A and 4B). The i

final surveys provided in this report danonstrate conpliance with the f

criteria for release to unrestricted use.

CCNCLUSICN The above described 15 labs (12 of which have mezzanines) and 9 other rezzanines (labs below these mezzanines are not included) have been j

cleared for release to unrestricted use. Final cor/: amination and radiation surveys show the levels meet the guidelines for release to uma=Lcicted use.

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m t

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ntf o l

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nc m) n s e d

e x

r.

1e nt 1 T f 1 a e en d

es rd a

mb r

vr u

1 t

a a

r,,

gd es ei st ul m

a r no aml t c s32 a21 ai r rl un s o oup u01 t 3 l

,i f

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a n e

es ao e 2.

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e.

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A c f

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erummr 4s TABE I f

ACEPTABE SURFAE CONTAMINATION [MLSV#

WCLII" AVERAE

MAXIMJM REiO/ABE'

b bd 2

.(dpm/100 cm )

(dpm/100 cm )

(dpm/100 c=2) a) U-nac, U-235, U-238, and 5,000 15,000 1,000 essociated decay products l

b) Transuranic, Ra-226, Ra-228, 100 300 20 Th-230. Th-229, Pa-231 Ac-227, f-ut, I-170 c) 'Ih-n a t, Th-232, Sr-90 1,000 3,000 200 Ra-223, Pa-224, U-232, I-126, I-131, I-133 d) Dets gamma emitters (nuclides 5,000 15,000 1,000 with decay modes other than alpha emission or spontaneous fission) except Sr-90 and others noted above.

e)

H-3, C-14 except as DNA 20,000 60,000 4,000 precursors f/

4 Where surface contamination by both alpha-and beta-gar =na~ emitting naclides exists, the limits established for alpha ~ and beta-gamma-emitting nuclides should apply independently.

Ls used in this table, dpm (disintegrations per minute) means the rate of emission by radioactive

.aterial as determined by correcting the counts per minute observed by an appropriate detector

!ct background, efficiency, and geometric factors associated with the instrumentation.

Measurement 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.

2

.The maximum contamination level applies to an area of not more than 100 cm.

i

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

by wiping that area with dry filter or soft ebsorbent paper, applying ncderate pressure, and assessing the amount of radioactive material on the wipe with an appropriate instrument of known e!!1ciency. When renovable contamination on objects of less surface area is determined, the pertinent levels should be reduced proportionally and the entire surface should be s,iped.

DNA precursors mean nolecules. or compounds that are directly incorporated into the DNA tclecule during DNA biosynthesis, e.g. purine and pyrimidine bases and their analogs, nucleotides and n ucl eosides. The acceptable surface contamination levels for H-3 and C-14 in DNA precursors are as tabulated in paragraph (d) for beta-gamma-emitters.

[USNi?CRegul.3coryGa:de1.55 Ter :1nat en of C erat:nc M :enres !c Vuclear Reacecrc, Wasnin?t==

s2.:.

(June 1974)

/ ARSI, Cont :1 of Radioactive Surface Contamination on Materials. Eculpment and Facilities To Be Relessed for Uncontrolled Use. final draft. oroposed Amer:can Nat:cnal Standarc N-322, Atomic Industrial Forum, Inc., N.Y.

(June 1974)

ATTACHMENT 3:

FINAL. SURVEY OF' Lab.234-14' 0

0 0

i) 17 E

20 0

0 0

3v 0

0 0

0 0-8 3

0 0

0 0-0 0

0 15 15 15 24' O

O O

O O-0 0

0 0

0 a

c 0

0 0

o

.g j0 0

0 0

00 g

a s

n 0

0 0

0' 0

0 25 26 4

l 0

0 0

0 NORTH 0

0 0

16 3

5 0

0 0

sank 0

0 0

Oi

,y 13' l

FINAL SURVEY OF LAB 234 COMPLETED 8-25-88 Instruments used were:

Ludium 19 microR meter,#33545 calibrated 2-29-88 and geiger counter TBM-28 #2759'- calibrated 6-24-88.

1.

Eoch unit represents a three foot by three foot area or less.

2.

Top value.ls the average beta / gamma. contamination in'DPM/100 cm square

~

infa-three foot by three foot area or.less.

3.-

Bottom value is the maximum bete / gamma contamination in DPM fer.an area <100 cm square.

4..

Circled numbers are' wipe locations.

3.

Numbers In' squares are measured mic'roR/hr levels.

6.

No. contamination was detected on floors or walls in this lab.

l

l ATTACBMENT 6:

INITIAL SURVEY OF COMBINED I4BS 321/323 24 1/2 '

S i

.s 0/

0 0

0 I

0 0

0 O

O O

O 0

0 0

O O

O 200 500 0

0 0

4000 5000 0

0 0

200 400 0

0 0

4000 4500 24' O

O O

0-0 0

0 0

0

'O O

O O

O j

0 0

0 1000 1000 0

0 0

8000 8000 0

0 y

6000 6000 l

WAu.

I 22'

?

k INITIAL SURVEY OF LABS 321/323 COMPLETED 4-27-88 N

INSTRUMENTS OSED WERE:

Ludlum 19 #33545, Calibrated 2-16-88 Ludlum 12 #46465, Calibrated 11-10-87 TBM-28 492238, Calibrated 4-21-88 I

1.

Levels were measured on tile and cuncrete floor 2.

Each unit represents a three foot by three foot area or less.

I 3.

Top value is the maximum net CPM with TBM-28 on floor tiles.

I 4.

Bottom value is the maximum net CPM on concrete under floor

)

tiles.

i 5.

The maximum net CPM for a small area (2 square feet) of the lower wall is also indicated. No other areas of the walls were contaminated.

l 6.

No contamination was detected in the mezzanines above these l

labs.

j l

1

4

+

l ATTACEMENT 7:

FINAL SURVEY OF L&BE 321/323

- t 24 1/2 '

O O

O 0.

0 0

15 3

4

'O O

O O

O Q

0 0

20 1 17 0

0 0

0 "- T/ 84 0

0 0

6244 8920 2

0 0

1784

)0 0

0 0

0 6244 6244 1

7 24' 20 0

0 0

'O O

O O

O 5

15 6

~

0 0

., 0 0

0 0

17 1

te O

O O

1784 784 0

0 0

6244' 12488

-0 0

6244 12488 k/ALL k

22'

)

N FINAL SDRVEY OF LABS COMPLETED 4/25/88, 4/28/88 AND 4/29/88 1

INSTRUMENTS USED WERE:

Ludlum 19 #33545,' Calibrated 2-16-88 Ludlum 12 #46465, Calibrated. 11-10-87 TBM-28 #92236, Calibrated 4-'21-88 l

1.

Levels were measured on tile or concrete floor after cleaning--

or scabbling.

2.

Each unit represents a three' foot by three foot area or less.

i 3.

Top value is the average beta / gamma contamination in DPM/100 1

cm sq in a three foot by.three foot area'or less.

4.

Bottom value is the maximum beta / gamma. contamination in DPM' for-an area less than 100 cm'sq.

5.

Circled numbers are wipe locations.

6.

Numbers in squares are microR/hr surface levels.

7.

Approximately 20 ft2_og concrete required scabbling.

(

-)

ATTACHMENT 8:

FINAL SURVEY.0F COMBINED MEZZANINE ABOVE LABS 321, 323, 325, AND 327 0

0 0

b# P ' 0-

.l O'

O 0._ 0 0

0 0

.0-0 0

0 0

0 0-0 0

j 7

7 1

7 0

0 0

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O "0

0 0

0 0-0 7

8 9

10 0

0 0

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""" M 15' k 48' NANS N

FINAL SURVEY OF MEZZANINES ABOVE LABS COMPLETED ON 4/25/88 AND 4/27/88-INSTRUMENTS USED WERE:

Ludlum 19 633545, Calibrated 2-16-88 Ludlum 12 #46465, Calibrated-11-10-87 TBM-28 492238, Calibrated 4-21-88 1.

Levels were measured on floor tile.

I 2.

Each unit represents a three foct by three foot area or less.

l 3.

Top value is the average beta / gamma contamination in DPM/100:

l cm sp in a three foot by three' foot area or less.

4.

Bottom value is the maximum beta / gamma contamination in DPM for an area less than 100 cm sq.

5.

Circled numbers are wipe locations.

6.

Numbers in squares are IticroR/hr readings.-

7.

No contamination was detected; No cleaning was required.

l l

- - - - - - ~ - -

-n-----------

- - - - - - - - - - ^ - - - - - - - - - -

ATTACHMENT 9:

FINAL SURVEY OF LAB 327 11'-

i

/s-0 0

0 0

0 0j 15 12, /

0 -

0 0

.0 0

0 0

0 B3 84 0

0 0

0

( 0 0

0 0

24' O

O O

0 13

( 2.

0 0

N 4

0 0

'O O

BI g.z 0

0 0

0 12-II O

O O

O 0

0 0

s, 12'

.l FINAL SURVEY COMPLETED 11-11-88 1

Instruments used were:

Ludlum 19 microR' meter #33545 calibrated 11-11-88, and'gelger counter TBM-28 #108113 calibrated 10-31-88' 1.

Each unit represents a three foot.by three foot area'or iess.

2.

Top value Is the average beta / gamma contamination in.DPM/100 cm square j

in a three foot by three foot eres or less.

3.

Bottom value is the maximum beta / gamma qpntamination in DPM for an area <100 cm square.

4 Circled numbers are wipe locations.

5.

Numbers in squares are measured microR/hr levels.

6.

No contamination requiring cleanup was detected in this lab.

]

I i

___e-__

._-_nx___7_____~_.__-______-_-_-

_ _ ~ _

~

ATTACHMENT 10:

FINAL SURVEY OF COMBINED LABS 343/345, AND LAB 347 f

24 1/2 '

M 12'

?

LAB R 43 /34c; t n a wr a

0 0

0 0/

0 0

0 0\\ 0 0

0 0

0 Of 0

0 0

0 10 10 10 10 jo

~

0 0

0@0

@0 0

0 0

0 s

0 0

0 E

O O

24' 10 12 12 10 10

~

0 0

0-'~'

O O

O O'

O O

0 0

0 0'

O O

@O

@O O@O O

O O

N O

O_0 0

0 0

l 10 12 14 10

.12 0

0 0

0 l

0 0

22' 11' SURVEY OF LABS COMPLETED 4/20/88 AND 4/27/88 INSTRUMENTS USED WERE:

Ludlum 19 #33545, Calibrated 2-16-88 Ludlum 12 #46465, Calibrated 11-10-87 TBM-28 #92238, Calibrated 11-9-87 1.

Levels were measured on tile floor after cleaning.

2.

Each unit represents a three foot by three foot area or less.

3.

Top value is the average bete / gamma contamination in DPM/100 cm sp in a three foot by three foot area or less.

4.

Bottom value is the maximum beta / gamma contamination in DPM for en area less than 100 cm sq.

5.

Circled numbers are wipe locations.

6.

Numbers in squares are measured 'microR/hr values at 1 meter.

7.

No contamination was found on floor or walls.

I 1

I ATTACHMENT 11:

FINAL SURVEY OF COMBINED MEZZANINES ABOVE LABS l

335/ 337/ 339/ 341/ 343/ 345/ 347/ AND 349 C

96' 00000000 00000000 000 0000000000000 i

00000000 000000 0 000 0000000000000 i

0b00b0 0b000 00000000 0

0 000000 00000000 00000000 000 0000000000000 12' OOOOOOOO OOOOOOOO OOO OOOO OOOOOOOOO 16' 000000 0000000 000 0000 000000000 000 00 0

00 0 M0 0 10 0

0000000 1

0000000 00000000 000 0000 000000000 l

{7 07

's 1

s 00 000000 000000000000000 000000000 j

00000000 000000000000000 000000000 gy

. 00 0(

00 00 0 00 000 0

8

' OOOOOOOOOOOOOOO OOOOOOOOO I

v 4/21/88 AND 442_7[N 4)LATFORM v.

SURVEY OF MEZZANINES COMPLETED 88 o

N A

INSTRUMENTS USED WERE:

Ludlum 19 #33545, Calibrated 2-16-88

.Ludlum 12 #46465, Calibrated 11-10-87 TBM-2 8- # 9223 8, Calibrated 11-9-87 4

1.

Levels were measured on tile floor af ter cleaning.

2.

Each unit represents a three foot by three foot area or less.

3.

Top value is the average beta / gamma contamination in DPM/100 cm square in a three foot by three foot area or less.

4.

Bottom value is the maximum beta / gamma contamination in DPM for an area less than 100 cm sq.

5.

Circled numbers are. wipe locations.

6.

Numbers in squares are measured micro R/hr values at 1 meter.

7.

No contamination requiring cleaning was detected.

O

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l

l ATIACBMENT 13: FDE SORVEY OF CDMBDED MEZZANDES ABCT/E IABS 425, 427, A10 429 0

0 0

0 p

^

0 0

7 T

7 n

0 0

0~0 0

0 0

0 )k Slu 12' O

O O

Q.,

@0 6

0 0

0 v

0 0

7 7

7 0

0 0

0 42' i

FDE SURVEY OF LAB ME"ZANDE WAS CDMPLLTED 10-20-68, USDG GM CDONIER (' IBM-28 #2759)

CALIBRA'IED 10/17/88 Ato LUDLUM 19 #39764, CALIBPA'IED 7/7/88..

IDIES:

1.

LEVELS WERE MEASURED CN TILE FLOCR AFTER CLEANDG.

2.

EACB UNIT REF?ISENIS A TEREE E00F BY THREE ECOT AREA OR LESS.

3.

'IDP VALDE IS THE AVERICE BEIA/GAWA DIRECT PEADIIG IN DPM/100 m SQUARE IN A TBREE FOCPI BY THREE FOCTf IREA OR LESS.

4.

BOFIDM VALUE IS TIE PAXIMUM BETA / GAMMA DIRECT REAODG IN DPM EUR AN AREA <100 m SQUARE.

5.

NUMREPS WITHIN SQUARES ARE LUDLUM '9 PEADDU3 IN MICRO R/IR.

6.

NUMtERS IN CIRCLES ARE WIPE IOCATIONS.

7.

10 CDNWIINATION WAS irm;rw.

l i

j

n t 4 ATMCEH2rf 14: FINAL SURVEY OF 000BDED L8BS 431 Ato 433 26' D-0 0

0 0

.0 0

0 0

12 10 10 10 0

0 0

0-0 0

0 0'

O 0

~0 0

0 0

0' O

O O

@L @

^

0 0'

O O

'O O

O O

-O O

24'.0 0

0 0

0 ~

0 0

0

~0 0

10 10 10 10 v

0 0

0 N

0g0 0

0 0

Eh 0

0 0

0-0 0_0 0

0 0

0 10 059 N./

0 0

'O O'

40 0

0 0

0 00 0

0 O_0-0 0

12 10 10 h

0-0 0

0 0-00 0

0 0

28' FINAL SURVEY OF LABS CDMPLETED 10/19/88 Ato 10/21/88, USUG GM (DUNER (' IBM-28 2759), CALIBMTED 10/17/88 Ale LUDLUM-19 #39764, CALIBRATED 7/7/88.

- W9: ' 1.

LEVELS NERE EASURED CN TILE FIOCR CR FUE IDOD AETER CLEANDG.

2.

EACH UNIT REPPISE!ffS A THREE FOCTP BY 'IEREE POOT NtEA CR

)

LESS.

i 3.

'IOP VALUE IS THE AVERME BETA / GAMMA DIRECT READHG IN DPM/100 CM SQUARE IN A THREE FOOT BY THREE PCCTf AREA OR LESS.

4 '. BCn'ICH VALUE IS THE MAXIMUM BETA / GAMMA DIRECT READIIG IN DPM EUR AN AREA <100 CM SQUARE.

S.

IEEERS E SOUTSIS IFI LUDLUM 19 READEUS IN MICRO F/EDUR.

6.

NGBERS IN CIRCLES API WIPE LOCATIO5.

4 o

7.

10 CONTAMINATION KAS DETECIED ON THE FLOORS OR WALLS OF.

_l TIESE IABS.

i

-l r~._.--__.__L_..--_

--___l_-_------

..g 4

ATD43ENT 15: FINAL SURVEY W CDEINED MEZZANINE ABWE IABS 431/433 26'

'O O

O O

O' O

O O

7 7

~

^

0 0

0-0 0

0 0

0 0.

0 0

0 y

16' 0

0 0

g 0

0 0

I 7

7 6"

0 0

V O

O O

O-0 0

0 0

0 7,0 7

7 7

l0 sivk.

0~0 0

0 0

0 0-0 -

i 0

0 0

0 O W TTAus 28' FINAL SURVEY WAS COMIUIED 10-20-88, OSING GM QX1NIER (' IBM-28 #2759) CALIBRA'IED 10-17-88, PACISA #34092 CALIBRATED 8-19-88 Ato LUDLUM 19 439764 CALIBRATED 7-7-88.

N7IES:

1.

LEVELS WERE MEASURED W TILE FICOR AFIER CLEANING.

2.

EACB UNIT mam.stWIS A THREE 100T BY THREE FOCTI AREA OR LESS.

3.

'IDP VALUE IS TIE AVERAGE BLWGAMMA DIRECT READIIG IN DPM/100 m SQUARE IN A THREE FOOT BY THREE FIXTT AREA OR LESS.

4.

BC7720M VALDE IS TIE MAXIMUM BETA /GAPMA DIRECT REA' DDG IN DPM FOR AN AREA <100 CM SQUARE.

5.

NUMBERS IN SQUARES ARE LUDLUM 19 RE70 DES IN MICRO R/IDUR.

6.

NUMBERS IN CIRCLES ARE WIPE IOCATIOFE.

7.

10 CONTAMINATION WAS DI?rECTED.

1 I

l O

J.

S 1

ATTACHMENT 16 3 -

FINAL SORVEY OF MEZZANINE ABOVE LABS 615/617'

-. q l

26'

^

0 0

0

-O 0

0 J

0 0

0' O

O 0

0-0 7

7-7 16' O

O 0-0 0

0 0

0-0 0

g-g:

6"

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O O

O' O

0 0

v 0

0 0

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0 0

0-0 0

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7 7

0 0

0 0-0 0

0 0

0

-0 0

0 0

0 28' 9

FINAL' SURVEY COMPLETED 5/18/88 USING GM COUNTER- (TBM_28

92238)

CALIBRATED 4/21/88 AND LODLUM 19 #33545, CALIBRATED 2/16/88..

NOTES:

1.

LEVELS WERE MEASDRED ON TILE FLOOR AFTER. CLEANING.-

2.

EACH UNIT REPRESENTS A THREE FOOT BY THREE FOOT AREA OR~

LESS.

3.

TOP VALUE IS THE AVERAGE BETA / GAMMA-DIRECT READING IN DPM/100 CM2 IN A THREE FOOT BY THREE. FOOT AREA OR LESS.-

4.

BOTTOM VALUE IS THE MAXIMDM. BETA / GAMMA DIRECT READING IN-DPM FOR AN AREA <100 CM2.

S.

CIRCLED NUMBERS ARE WIPE LOCATIONS.

6.

NUMBERS IN S00 ARES ARE MICRO-R/ HOUR READINGS AT 1 METER.

7.

.NO CONTAMINATION WAS DETECTED.

~

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.p ATDCSENI' 18: CNDMINATION SURVEY RESULTS Page 1 of 6 GROSS ALPHA / PETA COUNTING RE9ULTS FOR HIPE SAMPLE 9 JUN 2 0 988 1

ALPHA

" PETA COUNT 9 AMPLE ID LENGTH DPM/100 SG CM

% ERROR DPM/100 SGiCM,

% ERROR MIN 95%.CL 95% CL L-3 H-1 IeS~.323 1:

'<1 212E-02 95:00

<2:105E-01 95 00 2 6/17/99 Iab-323 1

<1.212E-02 95.00

<3 795E-02 95 00 3 Iab-323 1,

?3217E-01 121:25

'<2 105E-01 95i00 4 Imb-321 1.

<1:212E-02.

95,00

<7 571E-01 95,00 9 Zab 321 1:

<1:212E-02 95 00

<2:105E-01 95i00 6 Iab 323 1i

<1:212E-02 95,00

<7 571E-01 95.00

-?

Iab 321 Mezzanine 1.

<1:212E-02 95 00

<1:252E-00 05:00 9 Zab 323 Mezzanine 1i

<1,212E-02 95.00

<3i795E-02 05i00 9 Iab 325 Mezzanine 1:

2 633E-01 245i03

<2,105E-01 95>00 10Iab 327 Mezzanine 1

<1.212E-02 95.00

<3.795E-02 05.00 11Iab 343 1

<1 212E-02

5i00

<2i105E-01 05:00 12Iab 343 1

<1:212E-02 05:00

<2:105E-01

5i00 13 ab 345 1:

<1,212E 95,00

<3,795E-02 05.00 1

141ab 345 1

<1.212E-02 95:00

<2.105E-01 95.00 15Iab 347 1i 2,633E-01 245:03

<3i795E-02 95i00 141ab 347 1.

<1.212E-02' 05:00

-<3i?95E-02 95.00 171ab 335 Mezzanine 1i

<1.212E-02 05,00

<2>105E-01 05i00 19Zab 337 Mezzanine 1

<1.212E-02 95 00

<24105E-01 95:00

'l 19Zab 339 Mezzanine li

<1 212E-02 05.00

<2:105E-01 95.00 1.

20Zab 341 Mezzanine 1i

<1 212E-02 95i00

<7.571E-01 c5 00 21Iab 343 Mezzanine 1.

<1:212E-02 05 00

<3.795E-02 95 00 22 ab 345 Mezzanine 1>

2:633E-01 245103

<35795E-02

5i00 I

23 ab 347 Mezzanine 1:

<11"-^'

0 % 00

' <7:"'#-^1

5i00 I

I j

l i

M.. h. Y. r.

T. u. r.

T..D. R.. r.t D.. e.hn M.. n. T.

.T u r. t l.it.a r._

T. M sJ r t. r M. T.

F,,, r, t.T r.' T r N. f.* v,

r. o.. l.T ra c. 4. T. T. n_.M.l.l M. e r D.. T..a..t M. T. T. _e c,. :

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WT O M!NP 18: CXNIAMI!RTICE SURVEY RESILTS Page 2 of 6'

GROSS ALPHA / PETA COUNTING RESULTS FOR WIPE.9AMPLES fo ALPHA PETA COUNT SAMFLE ID LENGTH DPM/100 SG CM, y roono neweson eg,cM, v roono MIN 95% CL-95%:CL.

4 Iab 349 Mez h i.

< 1 _,, _9 r _ n. _,

o. s. 3 0 n. -

<, y e_ s_ r _ n. _,

o. s.. n. n..

At.8ER A GE '

e,142E-02 22903E-01 HIGH.

9.217E-01 1>252E 00 LOW 1:212E-02 3 795E-02 NOTE! THE ERRORS DO NOT INCLUDE INHERENT EFFICIENCY CALIBRATION' UNCERTAINTIES l

e 4.

____.l.__..__

_.._._...___________l

__.m._

r e

a ATDCHMENT 18: CCNINENATION SURVEY RESULTS Page 3 of 6 CROSS ALPHA / BETA COUtiTIttG RESULTS FOR WIPE SAMPLES s

8 199i ALPHA BETA MOV O CoutlT SAMPLE ID LEt1GTH DPM/100 SG.CM.

% ERROR DPM/100 Su.CM.

% ERROR Mitt 95% CL 957. CL LAD 3 W-25 Lab 234 1.

<1. 014E- 02 95.00 (9.500E-01 75 00 26 11/4/88 Lab 234 1.

<1.014E-02

?5.00 (4 054E-01 95.00 27 Lab 234 1.

<1.014E-02

?5.00 (9.520E-01

?5.00 28 Lab 234 1.

<1.014E-02 95.00

<4.054E- 01 95.00 27 Lab 425 1.

(1.014E-02 95.00 S.453E-01 150.81 30 Lab 427 1.

2.331E-01 227.93

<3 167E-02 95.00 31 Lab 427 1.

<1.014E-02 95.00 (9.520E 01 75.00 32 Lab 429 1.

<1.014E-02 95.00

<?.520E-01 95.00 33 Lab 429 1.

<1.014E-02 95.00 8.455E-01 150.01 34 Lab 427 1.

2. 8 31 E- 0,1 227.93 1.140E 00 125.11 35 Lab 427 1.

<1.014E-02 95.00

<1.44/E 00 95.00 36 Lab 425 1.

2.331E-01 227.93 (4.054E-01 95.00 37 Lab 429 Mezzanine 1.

2.331E-01 227.93 (4.054E-01 95.00 30 Lab 429 Mezzanine 1.

2.831E-01 227.93 (9.500E-01

?5.00 39 Lab 427 Mezzanine 1.

(1.014E-02 75.00 2.455E-01 150.31 90 Lab 427 Mezzanine 1.

'1.014E-02 95,00

<4.054E-01

?5.00 41 Lab 425 Mezzanine 1.

<1.014E-02 95.00 (9.520E-01 95.00 42 Lab 425 Mezzanine 1.

<1 014E-02

?5.00

<4.051E-01 95.00 43 Lab 433 Mezzanine 1.

C1.014E-02 95.00 (3 167E-02

?5.00 44 Lab 433 Mezzan2ne 1.

6.123E-01 149.03 (9.520E-01 95.00 i

1 45 Lab 431 Mezzanine l' 01 012E-02

?5.00

<3+117E-02

" 5 O '-

^' Lab 431 Mezzanine i-

-- *01lE*;-

"5400

5 2 0 E - ? '-

I5.--

+

47 Lab 433 Mezzanine 1.

1.014E-02 95.00

<3.167E-02 95.00 i

j 4

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r ATDCIM!NT 18: CONIMDETION SURVEY RESUTES Page 4 of 6 GROSS ALPHA / BETA COUNTING RESULTS FOR WIPE SAMi'LES 2

ALPil A -

BETA COUNT SAMPLE ID LENGTH DPM/100 30.CM.

% ERROR DPM/100 SG.0M.

% ERROR' MIN 95% CL 95% CL 48 Iab 433 Mezzanine 1.

<1.014E-02 95.00

<3.167E-02 75.00

' 47 Lab 431 Marimnhw 1.

<1.014E.02 95.00

< 4. 0 5 4 E--01 15 00 50 Lab 431 Mezzanine 1.

<1.014E-02 95.00 (3.167E-02

?5.00 51 Imb 433 1.

<1.014E-02 95.00

<3.167E-02 75.00-52 Iab 433 1.

<1.014E-02 95.00

<3.16 7 E- 0 2' :

95.00 53 Iab 433 1.

6.123E-01 147.03

<3.167E-02 75.00 54 Lab 433 1.

<1.014E-02 95.00

<?.520E-01

?5.00 55 Lab 433 1.

<1.014E-02 95.00 (4.054E-01 95 00 56 Iab 433 1.

2.331E-01 227.93 (9. 5:'0 E -01 75.00 57 Iab 431 1.

2.831E-01 227.73

<4.054E-01 95.00-

.j 50 Lab 431 1.

<1.014E-02' 95.00'

<9.500E-01 95.00 i

59 Iab 431 1.

<1.014E-02 95.00

<4.051E ?5.00 60 Lab 431 1.

6.123E-01 149.03

<4.054E-01

?5.00 j

61 Lab 615 Hezzanine 1.

<1.014E-02 95.00

<3.167E-02

?5.00

.62 Lab 617 Mezzanine 1.

2.831E-01 227.?3

' <4.054E-01

?5.00 63 Iab 615 Mezzanine 1.

<1.014E-02 75.00 S.4550-01 150.31.

i I

64 Lab 617 Mezzanine 1.

(1.014E-02 75.00 (4.054E-01

?5. 00-65 Lab 647 1.

2.831E-01

'27 93 x.4 054E-01

?5.00 v

-!j 66 Iab 647 :

1.

<1.014E-02 75'00 (4.054E-01

?5.00

- i

~

67 Iab 647 1.

<1.014E-02 95.00

<4 054E-01

?!. 00 -

. ?.520E-01

?' 5. 0 0 '

63 -

Lab 647 1 '.

<1.014E-02 95.00 i.

a> Lab 649

.r

,m.

4 - - '

+

-- +<--

e~~-

70 Iab 649 la 2*B312"01 227.?3 (7.520E-01

?5.00 NOIEl IHC ERICRC 00 MOT !!?C',,'jUI !N}{CT,EMT C T IC;;[MCY Cf.LIIIA~!O,' 'MCE7~"'!IC, i

1 I

i

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ATDCINEN1' 18: CNDMINATICN SURVEY RESULTS Page 5 of 6-CROSS ALPHA / BETA COUNTING' RESULTS FOR 'JIPE SAMPLLS ALPHA BETA

.a COUNT SAMPLE ID LENGTH OPM/100 SG.CM.

% ERROR' DPM/100 S3.CM.

ERRCR-

~

MIN 95% CL 95% CL 71 Lab 649 1.

<1.014E-02 95.00 (4.054C 95.00.

72 Iab 649 1.

2.Ca?E-01 228.93 3.770E 00 60.?;

73 Imb 651.

.1.

<1.014E-02 95.00.

<4.054E-01 95.00

-7 4 Lab 651 1.

2.331E-01 227.73 3.152E-01 156.53 75 Lab 651

1. '

2.831E-01 207.93

<1.447E.00 95.00:

76 Lab 651.

1.

2.831E-01 227.93.

<3.167E-02 95.00 j

77 Lab 647 Mezzanine 1.

<1.014E-02 95.00 C.167E-02 95.00' 70 Lab 647 Mezm 1.

6.123E-01 1*,9.03

<4.054E-01

?5.00

- 79 Iab 645 Mezzanine 1.

<1.014E-0:'

95.00

<1.447E.00 95;00 80 Lab 645 Mezzanine 1.

<1.014E-0,2 95.00

<9.520E-01 95.00 AVERAGE

1. 06:'E-01 "6.371E-01 H80H 6.123E-01 3.772E 00 L O'J

1. 01

E-0:'

3.167E-0:'.

NOTE: THE ERRCRS DC NOT INCLUDE 1MHERENT EFF10!ENCY~CtL:3 RATION UtlCERTAIMT!EO.

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,0 ATDONENT 18: COMMINATION SURVEY RESULTS Page 6 of 6

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