ML20151U003

Revised Final Radiological Survey of Building 30 - Phase II Rooms for Release to Unrestricted Use

ML20151U003
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Site:	07000734
Issue date:	09/02/1998
From:	GENERAL ATOMICS (FORMERLY GA TECHNOLOGIES, INC./GENER
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ML20151T986	List: ML20151T982 ML20151U003
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..... _ _._._ _ _ _. _ _ _. _ _ _ _ _ _ _ _ _ _.. _... _. _

CENERAL ATOMICS FINAL RADIOLOGICAL SURVEY OF BUILDING 30 - PHASE ll ROOMS FOR RELEASE TO UNRESTRICTED USE July 29,1998 Revised September 2,1998 e!O'*An$$0 Uooi$st C

PDR.

+ *M PHASEH IABLE OF CONTENTS Page LIST OF TABLES....

.... ii LIST OF FIGURES

............ iii INTRODUCTION

.... 1 SITE DESCRIPTION

.1 CRITERIA FOR RELEASE TO UNRESTRICTED USE......

..... 1 PREVIOUS ACTIVITIES (HISTORY OF USE)

.2 INSTRUMENTATION

... 3 BACKGROUND MEASUREMENTS......

.......... 3 S U RVEY PLAN................

.. 4 RESULTS OF THE FINAL SURVEY MEASUREMENTS

.. 5 Masslinn

... 5 Scanning 5

Fixed Measurements.............

.... 6 Removable Contamination Surveys.....

6 Exposure Rate Measurements.........

.6 CONCLUSION...................

.6 i

1 l

1 i

i i

l

.sT-

I 1

j PHASE!!

LIST OF TABLES Page Table 1.

USNRC's Acceptable Surface Contamination Levels..............

.8 Table 2.

State of CA Acceptable Surface Contamination Levels.........

9 1

Table 3.

List of instruments - Building 30 Phase 11 Decommissioning..

10 Table 4.

Background Measurements.....

. 11 Table 5:

Results of Radiation Scans and Fixed Measurements 12 l

Table 6:

Exposure Rate Measurements 14 1

Table 7:

Results of Removable Contamination Surveys 15 4

l l

ii U

kE PHASE 11 LIST OF FIGURES 1

Page I

Figure 1:

General Atomics Site Map......

............................ 17 Figure 2:

B uilding 3 0/31...............................................18 Figure 3:

Building 30 Phase ll Rooms

..............................,.,,. 19 l

1 Figure 4:

Masslinn Wipe Survey...............................

20 Figure 5:

Ceiling Removable Contamination Survey

... 21 I

Figure 6:

Fixed Measurements.

.22 Figure 7:

Floor Scans, Removable Contamination and Exposure Rate Surveys

...... 23 Figure 8: Final Wall Scans...........

. 24 i

l 1

f I

i 111

)

i

+M PHASE 11 INTRODUCTION General Atomics (GA) is continuing its efforts directed at decontaminating and obtaining the release to unrestricted use of selected laboratories and facilities on its San Diego site. GA has recently surveyed a group of rooms in Building 30. These rooms have been designated in this report as

" Building 30 - Phase ll."

The rooms in Building 30 to be released in Phase il are rooms 104,105A,108,108A (hallway included),110, iii,112, and 108 annex. The total area to be released to unrestricted use is

)

Only irradiated parts and sealed p/y sources were stored in these rooms. No 2,422.4 ft2 radiological contamination was detected in any of these rooms.

GA is requesting both the State of Califomia and the Nuclear Regulatory Commission to release these rooms to unrestricted use.

This report documents the results of extensive and

- comprehensive measurements completed in " Building 30- Phase 11" rooms and demonstrates that -

these rooms meet the approved criteria for release to unrestricted use.

]

SITE DESCRIPTION The location of Building 30 with respect to other facilities on the GA Site is shown in Figure 1. A layout of the Building 30/31 complex is shown in Figure 2. The rooms in Building 30 to be released

)

in Phase 11 are rooms 104,105A,107,108,108A (including the east hall),108 Annex,110, iii, and J

112. The partition wall that separated Room 108 and 110 has been removed as have the walls that j

enclosed Rooms 111 and 112.' Alayout of these rooms is shown in Figure 3.

The total area to be released to unrestricted use in the " Building 30-Phase ll" rooms is ~ 2422.4 ft.

2 CRITERIA FOR AELEASE TO UNRESTRICTED USE Table 1 is taken from U.S. NRC's cri aria for releasing facilities and equipment to unrestricted use.

It has been incorporated into GA's GNM-696 license. The State of Califomia's guidelines, "DHS Criteria for Release of Facilities and Equipment to Unrestricted Use," also known as "DECON-1,"

are summarized in Table 2.

Since only irradiated parts and sealed p/y sources were stored in these rooms, the applicable release criteria is:

1 i

+M PHASE 11 5,000 dpm/100cm, averaged over im, 2

15,000 dpm/100cm, maximum in a 100 cm' area if the average over im is met, 2

1,000 dpm/100cm removable contamination GA has conducted extensive and comprehensive surveys and sampling to demonstrate that the radiation levels in this facility are below the release guidelines.

PREVIOUS ACTIVITIES (HISTORY OF USE)

GA's Work Authorization logs were searched in order to review the previous activities conducted in each lab and to identify the radionuclides of concern. Although an exhaustive search of the records was not completed, enough information was obtained to demonstrate that detailed radiation measurements in each room were needed. Phase il rooms housed offices, machine and electronic shops, a radioac'ive source storage room, storage of irradiated material and the LINAC accelerator control room from 1961 to 1986. After 1986, equipment and material was stored in these rooms but no radioactively contaminated equipment or radioactive materials were used or stored in these rooms. A brief history of each room is provided below:

Room 104 This area was used as office space No radioactive material was permitted.

Room 105A This is the main outside entrance to Phase 11 areas and housed a machine shop.

No machining of radioactive material was performed in this area nor was any radioactive or

. activated material stored, used or handled in this area.

Room 107 This area was an electronics lab and was used to test and repair irradiated and non-irradiated equipment.

Room 108 This area was primarily used as a data collection center; limited testing of irradiated electronic equipment was conducted in this area.

108 Annex This room was used for storage of radioactive materials including sources (kept in a locked cabinet) and irradiated equipment. All equipment and tools with removab contamination were stored in sealed containers to avoid any contamination in this area.

Room 110 This room contained high-voltage power supplies for the accelerator. No radioactive or contaminated materials were used or stored in this area.

]

Room 108A This area is a hallway leading to the accelerator test cells. The " lay-down" was J

covered with brown paper or plastic sheeting and irradiated materials, equipment, or tools were 2

1 kE PHASELI placed here to be surveyed by the HP tech. Routine smear surveys were conducted in the hallway every day. The hallway was routinely cleaned by a decontamination team every Monday moming or whenever removable contamination was found as a result of the smear surveys when the LINAC was operational.

Room 111 - This room was the Health Physics office and counting room. Only small sealed instrument check sources were allowed in this room.

Room 112 - This room was the Linear Accelerator Control Room. No radioactive materials were permitted in this room.

INSIRUMENTATION Table 3 is a list of instruments used during the radiological surveys. The table includes: (1) a j

description of the instrument, (2) the model and serial numbers of the rate meters and detectors, (3) instrument ranges, (4) calibt alfon due dates, (5) typical efficiencies, and (6) typical background count rates.

BACKGROUND MEASUREMENTS Three (3) different surfaces exist in the " Building 30 - Phase ll." These surfaces are cement-block, concrete, and drywall. Building 13 was selected for conducting background measurements due to the age of the building, because radioactive material has never been used in this building, and the various surfaces found in Building 30 - Phase li could also be found in Building 13.

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

each surface surveyed with the 100 cm gas flow proportional detector were calculated using equations 8-11 and 8-12 from the draft version of NUREG/CR-5849' as shown below:

4 Equation (8-11)

MC, x, l

a.

Equation (8-12)

,'. E 6-">'

\\

n -1 Background measurements and minimum detectable activities (MDA's) for each type of surface and for various counting times are provided in Table 4. Minimum detectable activities (MDA's)

' Manual for Conducting Radiological Surveys in Support of License Termination (Draft for Comment), NUREG/CR-5849, ORAU-92/C57, Oak Ridge Associated Universities, June 1992.

3 4

1 i..

+M PHASE 11 for each type of surface, were calculated using equation (5-2) from draft NUREG/CR-5849 as shown below; i

4 Equation (5-2) 2 MDA =

(dpm/100cm )

^

txEx 100 i

b Where:

1 Ba=backgroundrate (cpm) t = count time (min)

E = eficiency A = area ofthe detector (cm')

1

^

For background exposure rate surveys, a room in Building 1 (an office building) was chosen for background measurements because (1) radioactive material has never been used in this j

room or building and (2) the construction of the room (concrete floor, walls and ceiling) was

)

similar to the Building 30-Phase ll rooms.

j SURVEY PLAN 7

1i ltems and equipment in these rooms were surveyed using a geiger counter prior to removal from the facility. No radioactive contamination was detected on any of the equipment. After l

all items and equipment were removed, a survey plan was developed based on the previous l

history of the rooms, the radionuclides of concern, the various types of surfaces and the 4

potential for contamination. The physical characteristics of the rooms (vents, painted l

surfaces, unpainted surfaces, overhead structures, etc.) were inspected in determining the number of locations and types of surveys to be performed.

?

Floor tile was surveyed and removed from the rooms (no contamination was detected on the tile). Final surveys were performed on concrete surfaces.

Soil sampling was not performed based on the history of the facility and because no contamination was detected on any of the surfaces.

4

+M PH&SE il Final Survey Plan for Building 30 - Phase 11 Rooms (Total of ~2,422.4 ft' )

Non-Suspect Affected Area Rooms

%8 Room 104 Room 107 Rooms 108/110 Type of Survey 05A

" " '12 Annex (140.4 ft')

(327.7 ft )

(788.8 ft )

8 8

(185 ft')

(899.8 ft )

(81.5 ft )

2 Floor 100% p scan Yes Yes Yes Yes Yes Yes Lower Walls Yes Yes Yes Yes Yes Yes (bottom 2m) 10% scan Ceiling Yes Yes Yes Yes Yes Yes Masslinn Smears

1. of Fixed 1

0 2

2 5

1 Measurements (1 min)

(1 min)

(1 min)

(1 min)

(1 min)

1. of Smears 2

1 2

5 g

1

1. of MicroR MicroR readings were taken in all areas at random locations including the cable Readings troughs.

Cable Troughs Yes Yes Floor Surface Concrete Concrete Concrete Concrete Concrete Concrete after Tile after Tile Removed Removed Total # of 3

1 4

7 14 2

Measurements RESULTS OF THE FINAL SURVEY MEASUREMENTS Masslinn Survey Large area masslinn surveys were conducted on all floor surfaces, in the cable troughs and on the overheads. Masslinn smears were checked with the Ludlum Model 3 ratemeter 2

equipped with 15 cm geiger counter probe (listed in Table 3) and with a Luc?um Model 12 i

ratemeter equipped with a Model 43-65 alpha probe (listed in Table 3). No contamination was detected on any surfaces (see Figures 4 and 5).

Scanning 2

Scanning was performed in each room using a floor monitor having a 434 cm gas-flow proportional detector. The floors and the walls (up 2m) received 100 percent and 10 percent scanning, respectively, for beta contamination; upper walls were not surveyed. The results of l

the scans are provided in Table 5 and in Figures 5 and 7. Readings were at or near background levels (see Table 4 for background levels) except in Room 108 annex where the beta levels were slightly elevated. Follow-up measurements using hand-held instruments showed no contamination (geiger counter readings ranged from 100-140 cpm, near 5

+M PHASE 18 4

background levels and < 2000 dpm/100 cm, below the release criteria), and alpha 2

measurements using a hand-held instrument showed no contamination (readings were O cpm).

Fixed Measurements Fixed measurements were performed using a beta gas-flow proportional counter having a 100 cm' detector. The counting time for fixed measurements was one (1) minute in all rooms. For fixed measurements, an appropriate background was determined for each type of surface and subtracted from the survey readings. The readings were converted to dpm/100 cm using the 2

efficiency of the detector.

A total of twenty-three (23), one minute fixed measurements were taken on the concrete floors.

The results are provided in Table 5 and the approximate locations (and results) are shown in Figure 6. The maximum result was 750 dpm/100 cm, well below the release criteria.

2 Removable Contamination Survays Removable contamination measurements (smears) were performed on all surfaces including the floors, walls, and overhead structures (lights and support beams). Smear surveys consisted of using a Whatman Filter Paper (4.7 cm dia.) and wiping an area of ~100 cm. The 2

smears were counted in GA's Health Physics Laboratory using a Canberra 2404 alpha / beta counter. A total of 52 smears taken. Each smear area result showed activity levels <10 2

2 dpm/100 cm alpha and < 10 dpm/100 cm beta; well below the releass criteria. Approximate locations of smears are shown in Figures 5 & 7 and the results are provided in Table 7).

Exposure Rate Measurements Direct radiation exposure rate measurements taken at 1 m above the surface using a microR

( R) meter were taken at various locations in every room. The results are provided in Table 6 and shown in Figure 7 (not each reading is noted in Figure 7). Radiation levels ranged from 14-22 R/hr.

Since the facility is constructed of dense concrete floors, walls and ceilings, a suitable background was found in Building 1 (a room also constructed of concrete floors, walls and ceilings). Ten (10) readings, taken at ~1m from the surface ranged from 18-23 pR/hr, as shown in Table 6.

Comparing the readings taken for the Phase ll rooms of Building 30 with the Building i background leveis shows that the readings in the Phase 11 rooms are at or near background levels for this type of facility. Exposure rate levels are therefore well below the release criteria of 10 pR/hr above background at 1 meter from the surface.

CONCLUSION Final contamination and radiation surveys provided in this report, designated as "Bullding 30-Phase ll" demonstrate that the Phase ll areas meets the approved guidelines for release to unrestricted use.

6

hE PHASE 11 TABLES 7

+M PHASEll Table 1: USNRC'S ACCEPTABLE SURFACE CONTAMINATION LEVELS '

NucEdet A

Ad Average 'd Maximum '

Removable **>

(dpm/100cm')

(dpm/100cm'l (dpm/100cm )

2 U-nat,235U,23eU, & associated decay products 5,000 a 15,000 a 1,000 a Transuranics, 22 era, 22 era, * 'Th, 22sTh, Pa, 100 300 20 22'Ac, "5, i2 g 1

Th-nat, 232Th, "Sr, 22'Ra, 22'Ra, 232U, "*l, "31, "'I 1,000 3,000 200 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 nuchdes exists, the limits estabhshed for alpha-and beta / gamma-emitting nuclides should apply independently.

b As used in this table dpm (disintegrations pe, minute) means the rate of emission by radioactive material as determined by correcting the counts per minute observed by an appropriate detector for backgrouad, efficiency, an geometric factors associated with the instrumentation.

c Measurements of average contaminant should not be averaged over more than i 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.8 e The amount of removable radioactive material per 100 cm of surface area should be determined by wiping that area with dry l

8 filter or soft absorbent paper, applying moderate pressure, and assessing the amount of radioactive material on the wipe with an appropdate instrument of known efficiency. Wnen removable contamination on objects of less surface area is determined, then i

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 no exceed 0.2 mrad /hr at 1 cm and 1.0 mrad /hr at 1 cm, 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, oe Special Nuclear Material, USNRC, July 1982, incorporated into GA's SNM 696 license.

8

E PHASE 11

' Table 2: I STATE OF CA ACCEPTABLE SURFACE CONTAMINATION LEVELS 5 Average **'

Maximum **'

Removable **'

2 2

- (dpm/100cm )

(dpm/100cm')

(dpm/100cm >

U-nat,2250, * 'U, & associated decay 5,000 15,000 1,000 products Transuranics,22 era, 22sRa,2 Th, 22eTh, 100 300 20 as'Pa, 22'Ac, '2't,12s; Th-nat, 82*Th, 8 Sr, 22sRa, 22'Ra, 232U, *l, '88,

1,000 3,000 200 1

isig 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 i

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,

8 2

e The amount of removable radioactive material per 100 cm of surface area snould 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 cm and 1.0 mrad /hr at 1 cm, respectively, measured through not more than 7 milligrams per square centimeter of total absorber.

Guidelines For Decontamination of Facilities and Equipment Pnor to Release for Unrestrictod Use or Termination of Ucenses For byproduct, Source, or Special Nuclear Material, also known as "Decon-1" incorporated into GA's State of CA Radioactive Materials License.

9

a v,r

+M PHASED Table 3.

List of instruments - Building' 30 Phase ~ ll Rooms

+

Instrument De8ector Range Calibration Efficiency

Background

Description rm_a n.

n Ludlum Ludlum Model 43-37 gas rvr,Le Four Linear Ranges 07-09-97 S = 21.85% Vanes accor$ng to surface tengActrve Probe Are = 434cm ". The detector and RATE METER are combmed and M 2221 (434 cm') Beta detector 0 - 500.000 & One Log 4n Th-230 scanned mounted on a roe around cart. The instrument features a stanc-cow system, quck S/N 083265 50 - 500.00010 See Table 4 connects, a porta sie gas botDe and a rneans to adjust the he+ght of the detector fron g

g the Soor for optm urn performance Ludlum Ludlum Model 43-37 gas pvr,in,is Four Unear Ranges 06-04-98 S = 21.14%

Vanes according to surface bemg Actnre Probe Area = 434an. The detector and RATE METER are comtuned and 8

M 2221 (434 cm') Beta detector 0 - 500.000 & One Log scanned.

mounted on a rot around cart. The instrument features a stabe-flow system, quck 083293 m 500 m 4n Sr-90 See Tm m.a e e gam w a rneans e e the wd the m w S/N 84459 the floor for opbmur performance.

Ludium -

Ludlurn Model 4348 Four Enear ranges 04-27-98 S =28.95%

Vanes acx:ordmg to surface besng 100 cm gas flow pr sportonal counter.

a Model 2221 100 cm' proporbonal 0 - 500.000 & one 4n Sr-90 scanned Beta e unter S/N 142540 log 50-500.000 See Table 4 2

Ludlum Ludium Model 4345 Four ranges 10-15-98 a= 21.58%

0 cpm Aceve Probe Area = 50 cm8 Model 12 Alpha ScintiHator 0 -500.000 4n Th-230 UI S/N 138801

. Ludlum Ludlum Model 44-9 BotafGamma Four Ranges 04-15-98 p=23.24%

0-120 cpm Actve Probe Area = 15 cm' Model 3 probe 0 -100.000 4n Sr-90 M 145973 S/N 139180 U6 % smmg.

Ludium ModelRCA 6199 coupled to a Nat (TI)

Five Ranges 0443-98 N/A 18-23 pR!hr 1 inch x 1 inch Nat (TI) sontillator is mounted mtemally 19 MM ScintiHator 0 - 5 mR/hr (for these areas)

Used for initial survey on ground floor and for measunng extemal dose rates on the See Table 6 surface and at one meter.

SIN 144068 Canberra LowGas Flow Proportional Detector N/A 26 - 30 %

a = J 5 cpm Low Level ra/p Gas Proportonal Courrong System level alp p = 2.0 cptn Counter Model 2404 Ludlum Model 43-37 gasrvr,6 ;(434 Four Linear Ranges 7-13-98 21.15 %

0 Aceve probe area = 434 cm'. The detector and RATE METER are comtaned and M 12221 cm )434 cm' alpha detector 0-500 000 & One vanes acx:ordeg to surface bemg mounted on a roll around cart The instrument features a stabc-flow system, quck stn 086236 Log 50-500 000 scanned connects, a portable gas bottle and a means to adjust the he ght of the detector frorr tne floor for opemum performance 10

3 4

~

+M eaAse u l

i TABLE 4: Background Measurements-I 100 cm2 beta detector (S/N 86332)

)

Background Material Average of 10 measurements MDA j

Building 13 (1 minute counting time)

(dpm/100 cm )

2

]

Counts per minute i 2 SD Drywall 287122 283 Concrete Block wall 447128 350 Concrete 531 128 381 2

- 434 cm Floor Monitor Background Scan Results (S/N 84459)-

Background Material Beta / gamma Scan Range (counts per minute)

Building' 13 Drywall 770-937 Concrete block wall 1174-1409 i

Concrete 1400-1570 2

434 cm Floor Monitor Background Scan Results (SIN 73701)-

. Background Material Beta / gamma Scan Range (counts per minute)

Building 13 Concrete block wall 1281-1554 Drywall 906-1050 Concrete 1795-2030 11

.. y a.

L

+M PHASEE

{

I Table 5: Results of Radiation Scans and Fixed Measurements i

seen noeune

. gg Flood Measuremente (100 cm' beta detactm) N l

Type or surfae*

' Figure s nonesofTotes sete sechryound m,

ActMer or"m Readines gm, y

NDA' ActMar (com)

(com>

Room 104 '

Floor (concrete) 7 1218-1683 "3 1

1 516 531128

<MDA 381 Walls (drywall) 8 543-827 t

i l

(concrete block) 8 1011-1368 Room 105A Floor (concrete) 7 1430-1885 2

1 543-552 531128

<MDA 381 i

i Walls (drywall) 8 735-1181 l

I l

(concrete block) 8 1483-1704 l

Room 107 l

l Floor (concrete) 7 1425-1759 "8 3

1 522-570 531128

<MDA 381

[

t Walls (drywall) 8 810-1175 l

l (concrete block) 8 1132-1541 Room 108 Floor (concrete) 7 915-1543 4

1 493-539 531128

<MDA 381 Walls (drywall) 8 783-1038 (concrete block) 8 1503-1882

[

L i

12

i PHASER Table 5: Results of Radiation Scans and Fixed Measurements

- Scan Results pg Ftzad Isoasurements (100 cm' beta detector)

• Type or Sueface Figure #

Range of Total Beta.

W 8'ta -

s of.

count mm aAmenum Activer cpm RAusummets

@*iutes)

,, W100cm')

{ep Room 108 Annex Floor (concrete) 7 2003-2358 2

1 727-748 531 128 750 381 Walls (concrete block) 8 1283-1563 Room 110 Floor (concrete) 7 915-1543 3

1 502-553 531128

<MDA 381 Walls (drywall) 8 978-1182 (concrete block) 8 1503-1882 Room 108A, iii,112 Floor (concrete) 7 1540-1968 8

1 521-650 531228 411 381 Walls (drywall) 8 827-1076 (concrete block) 8 1110-1875

") Scans performed with floor monitor s/n 84459. The rest of the scans performed with floor monitor s/n 73701.

• Alpha scans also performed in some of these rooms (see Figure 7 for results).

• All measurements obtained with instrument s/n 86332 (efficiency 28.95%).

13

fM PHASE 11 TABLE 6: EXPOSURE RATE MEASUREMENTS Building 30 Phase 11 Rooms -

' Location Number of Range of Exposure Rates Measurements

' at 1 Meter (pR/hr)

Room 104 4

16 (All)

Room 105A 4

14 15 Room 107 8

15-16 Room 108 13 14-17 Rooms 108A, 14 16 22 111,112 Room 108 7

17-20 i

Annex Room 110 4

14 16 1

Background Exposure Rate Measurements Location Type of Number of Range of Exposure Rate surfaces Measurements Measurements at 1 m above the Surface (pR/hr)

Building i basement Concrete walls 10 18-23 Electrical Room

& ceiling I

14

}

=

PHASEll Table 7: Results of Removable Contamination Surveys.

Removable Activity Measurements Number of Maximum Activity Smears on each Figur.#

Total Number (dpm/100 cm*)

Surface.

of smears Alpha Beta Room 104 5&7 7

<10

<10 n

Room 105A 5&7 2

<10

<10 q

Room 107 UI 10 Floor 4

Ceiling 5&7 18

<10

<10 4

Outside HVAC Due l

Room 108 5&7 6

<to

<10 2

Room 108 Annex 1

Floor 7

1

<10

<10 Room 108A, iii,112 9

Floor 5

Ceihng 5&7 14

<10

<10 Room 110 2

Floor 2

Ceiling 5&7 4

<10

<10 "llncludes wipes taken on the floor prior to removal of the tile.

15

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Figure 4: Building 30 Phase il Rooms. Masslinn Wipe Survey

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l CORRIDOR Note:

1.

Large area masslinn wipes showed rio detectable contamination. Piles of debris in tNs area showed no detectable contammation.

20

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.e Figure 5: Building 30 Phase 11 Roorns. Removable Contamination Survey on Overhead Structure

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ILqtes.; Removable CA.

. Survey of Overhead Structure

1. The numbers crded are soproximate locahons of wpos taken. Wipe results. p were aa <10 dpmn00cm & a were og <10 dpm/100cm2, 2

2.

Large area masshnn wpes were also taken on accesse ce&ng areas No detectatmp contammation was seen on masshnn wipes checked with hand held a and p.'y nieters

3. As metal, wood & concrete surfaces fig 5 vsd 6

21

Figure 6: Building 30 Phase 11 Rooms. Fixed Measurements

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CORRIDOR Ngt-p-Fixed Measurements t

1. The values provided are the approximate locations of measurements taken. One minute (cpm) fixed p readings were taken

)

- every 5 meters (total of 23 readings) using a 100 cm detector. Results converted from cpm to dpm/100cm 2

2 The maximum resu!t was 750 dpm/100cm2,

2. At concrete surfaces.

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Figure 7: Building 30 Phase il P.ooms. Floor Scan, Removable Contamination & Exposure Rate Surveys

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hiote Aten m rooms 104 and 107 were covered wetts sie Wipes were performed befbre ancf after efe was CORRIDOR

,emoM i

9 i

Notes.

Floor Scan, RemovatWe Co4.

. & Exposure Rate Results.

1.

-100% of the floor was scanned for p usmg a 434cm. Results ranged from 915 cpm 10 2358 cpm on concrete surfaces a

2. The numbers circed are approxrviate locations of wipes taken. Wipe results. $ were a6 <10 dpm/100cm & a were a2 <10 dpm/100cm.

2 2

3 Exposure rate measurement (s) were taken. General area results ranged from 14 pre 11r to 22 pR.iir.

4.

Dry was, cement tHock and ccncrete surfaces.

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t Fig 7 vad I

23

s Figure 8: Building 30 Phase 11 Rooms. Final Wall Scans suaw o.or r ruc*

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s t

No'es Fmal war scan 2

1. -10% lower waNs were scanned for $ usmg a 434cm de: actor. A3 results are m cpm and ranged from 543 cpm to 18C2 gm.

2. As dry war & concrete block surfaces.

fig 8.vsd 24 i

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