ML20236W926

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Final Radiological Survey of Rooms for Release to Unrestricted Use (Bldg 30 - Phase II)
ML20236W926
Person / Time
Site: 07000734
Issue date: 07/29/1998
From: Cowan S, Gonzales L, Keesling D
GENERAL ATOMICS (FORMERLY GA TECHNOLOGIES, INC./GENER
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NUDOCS 9808060307
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{{#Wiki_filter:_ _ _ _ _ - _ _ _ _ _ _ _ _ _ - _ _ _ _ _ - _ h GENERAL ATOMICS FINAL RADIOLOGICAL SURVEY OF ROOMS FOR RELEASE TO UNRESTRICTED USE (Building 30 - PHASE II) July 29,1998 Prepared By: Dan Keesling, Scott Cowan, Laura Gonzales and Paul Maschka I I I I l ggeoggggKgjggggg4 C PDR

l l l l 1 kE PHASE 11 l TABLE OF CONTENTS Page LI ST O F TAB LE S............................................................ ii LI ST O F FI G U R E S......................................................... iii INTRODUCTION ...........................................................1 SITE DESCRIPTION ........................................................1 CRITERIA FOR RELEASE TO UNRESTRICTED USE............................. 1 i Facilities and Equipment............................................... 2 i Soil Criteria.......................................................... 2 PREVIOUS ACTIVITIES (HISTORY OF USE)..................................... 2 I N STR U M ENTATI O N........................................................ 3 BACKGROUND MEASUREMENTS ............................................3 SU RVEYS PLAN AN D SU RVEYS.............................................. 5 S u rvey Plan........................................................... 5 Removal of items and Equipment....................................... 5 RESULTS OF THE SURVEY MEASUREMENTS................................... 5 M a s slin n............................................................ 5 l S ca n nin g............................................................ 6 ) Fixed Measurements................................................... 6 Removable Contamination Surveys....................................... 6 Exposure Rate Measurements........................................... 6 l ADDITIONAL MEASUREM ENTS............................................... 7 1 } CONCLUSION..............................................................7 A P P E N D IX................................................................ 2 8 1 f 1 f 1 ) l I

h "M PHASEH LIST OF TABLES Page Table 1. USNRC's Acceptable Surface Contamination Levels.................. 9 Table 2. State of CA Acceptable Surface Contamination Levels................ 10 Table 3. List of Instruments - Building 30 Phase ll Decommissioning............. 11 Table 4. Background pR Measurements Determination....................... 12 Table 5. Background Measurements...................................... 13 Table 6: Results of Radiation Scans and Fixed Measurements.................. 14 Table 7: Selected Confirmatory Measurements.............................. 16 Table 8: Exposure Rate Measureme-ts.................................... 17 Table 9: Results of Removable Contamination Surveys....................... 18 l l ii

kE PHASE 11 LIST OF FIGURES Easa Figure 1: View of Site................................................... 20 Figure 2: Building 30/31 Complex .........................................21 Figure 3: Building 30 - Phase il Rooms .................................... 22 Figure 4: Final Floor Masslinn Smear Survey Locations........................ 23 Figure 5: Final Ceiling Masslinn and Smear Survey Locations.................... 24 Figure 6: Final Floor Fixed Meter Survey Readings........................... 25 Figure 7: Final Floor Scans, R Meter Readings and Smear Locations............. 26 Figure 8: Final Wall Scan Survey Locations.................................. 27 l. l l l I I l

hE PHASEll INTRODUCTION General Atomics (GA)is continuing its efforts directed at decontaminating and obtaining the release 5 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 11." It is urgent that these rooms get released to unrestricted use as soon as possible. The rooms in Building 30 to be released in Phase il are rooms 104,105A,108108A (hall way included), 110,111,112, and 108 Annex. The total area to be released to unrestricted use is 2 2,422.4 ft, GA is requesting both the State of Califomia and the Nuclear Regulatory Ccmmission to release these rooms to unrestricted use. This report documents the results of extensive and comprehensive measurements completed in " Building 30- Phase ll" 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 112]. The partition wall that separated Room 108 and 110 has been removed as have the walls that enclosed Rooms 111 and 112. A layout of these rooms is shown in Figure 3. A total of nine (9) rooms are included in " Building 30 - Phase 11." The total area to be released to unrestricted use in the " Building 30-Phase 11" rooms is - 2422.4 ftz, CRITERIA FOR RELEASE TO UNRESTRICTED USE Table 1 is taken from U.S. NRC's criteria for releasing facilities and equipment to unrestricted use. it has been incorporated into GA's SNM-696 license. The State of Califomla's guidelines, "DHS Criteria for Release of Facilities and Equipment to Unrestricted Use," also known as "DECON-1," are summarized in Table 2. 1

i +M PHASEN Facilities and Equipment Since only irradiated parts and sealed ply sources were stored in these rooms, the applicable _ release criteria is: 2 5,000 dpm/100cm, average over 1m, 2 2 15,000 dpm/100cm maximum in 100 cm average if average is net, 2 1,000 dpm/100cm removable. Soil Criteria No soil contamination was encountered in the rooms of Phase 11. I a GA has conducted extensive and comprehensive surveys and sampling to demonstrate that the radiation levels in this facility are below the release guidelines, i PREVIOUS ACTIVITIES (HISTORY OF USE) Phase il rooms housed offices, machine and electronic shops, a radioactive source storage room, storage of irradiated material and the LINAC control room from 1961 to 1986. After 1986, Phase 11 rooms were used to store a variety of equipment and material; no radioactive materials were kept, stored or used in these areas during this period. GA's Work Authorization logs were searched in order to review the previous activities conducted in each lab and to identify the radionuclides of concem. 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. ) HISTORY OF PHASE 11 ROOMS A brief history of each room is as follows: l Room 104 This area was used as office space. No radioactive material was permitted in this area. )I 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. l Boom 107 This area was an electronics lab and was used to test and repair irradiated and non-irradiated equipment. 2 l I

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 removable contamination viere 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 10BA This area is a hallway leading to the accelerator test cells. The " lay-down" was covered with brown paper or plastic sheeting and irradiated materials, equipment, or tools were 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 removab!e 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. Note: Rooms 108A,111,112 were combinedin the finalreport because the walls had boen removed. INSTRUMENTATION Table 3 is a list of instruments used during the radiological surveys. The table includes: (1) a description of the instrument, (2) the model and serial numbers of the rate meters and detectors, (3) instrument ranges, (4) calibration due dates, (5) typical efficiencies, and (6) typical background count rates. BACKGROUND MEASUREMENTS Four (4) diffe.ent surfaces exist in the " Building 30 - Phase ll." These surfaces are cement-block, tile over concrete, 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 il could also be found in Building 13. Background measurements were taken during January 1998 and February 1998. Statistical analysis of the data obtained from R meter background readings (Table 4) indicate that a sample size of five (5) measurements is sufficient to be statistically relevant. Determination of the 3

_ _ _ _. - _ _ _ _. - _. _ - - - - - - - - - - - - - - - - ~ - - - - - - ' - - - - numbers of background data points needed were calculated by using the following formula from the draft version of NUREG/CR 5849:") Equation (8-22): Where: n, = Number of measurements to add t,n = Constant for 95% Confidence at n-1 S, = Standard Deviation of the Measurements Taken R = Mean of the Measurements For fixed background measurements, shown in Table 5, the mean and standard deviation for each surface surveyed with the 100 cm gas flow proportional detector were calculated using equations 2 8-11 and 8-12 from the draft version of NUREG/CR-5849 as shown below: Equation (8-11): '1 Equation (8-12): D, Gr-x)'

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n-1 Background measurements and minimum detectable activities (MDA's) for each type of surface and for various counting times are provided in Table 5. Minimum detectable activities (MDA's) for each type of surface, were calculated usirg equation (5-2) from NUREG/CR-5849 as shown below: UI Manual for Conducting Radiological Surveys in Support of Ucense Termination (Draft for Comment), NUREG/CR-5849. ORAu-92/C57, Oak Ridge Associated Universities, June 1992. Equation (5-2) 2.71 +4.65/B,xt(dpm/100cm ') MDA= ^ txEx Where: Ba= background rate (cpm) t = count time (min) E = efficiency A = area ofthe detector (cm ') 4

l l SURVEY PLAN AND SURVEYS Survey Plan A survey plan was developed that included 100% scanning of all materials and equipment that were removed from Building 30 Phase 11. No contamination was found on any equipment using the Ludlum Model-3 Geiger counter equipped with a 15 cm pancake probe (listed in Table 3). The 2 survey plan also includes wipes (smears), scanning, fixed measurements and microR readings based on the previous history of the rooms. Also, the radionuclides of concem, the various types of surfaces and the potential for contamination were considered in the development of the survey plan. The physical characteristics of the rooms (vents, painted surfaces, unpainted surfaces, overhead structures, floor coverings, etc.) were inspected in determining the number of locations and types of surveys to be performed. All floors were covered with tile. The tile was surveyed and met the criteria for clean release. The tile was removed before the characterization survey was started. This area was categorized as a "Non-Suspect Affected Area" as defincd in GA's Site Decommissioning Plan and surveys were conducted in accordance with the approved Characterization and Final Survey Plans (See Appendix A & B). Characterization surveys showed no detectable contamination and is included in the final survey results. Survey measurements for surface activity consisted of a combination of surface scans, direct measurements, and measurements of removable activity. Rsmoval ofitems and Equipment in each room, all items and equipment were surveyed prior to removal using the Ludlum Model-3 Geiger counter listed in Table 3. No contaminated equipment was found during these surveys. RESULTS OF THE FINAL SURVEY MEASUREMENTS The rooms in Building 30 - Phase 11 were categorized as *Non-Suspect Affected" areas based on historical information and scanning of the floors (no contamination detected). 5

l hE PHASE 11 MIeslinn Survey Large area masslinn surveys were conducted on all floor surfaces and in the cable troughs. No contamination was detected as a result of this survey (see Figure 4). Masslinn smears were checked with the Ludlum Model 3 Geiger counter equipped with a 15 cm probe (Listed in Table 3). 2 Scanning Scanning was performed in each room using a floor monitor having a 434 cm gas-flow proportional detector. 2 The floors and the walls (up 2m) received 100 percent and 10 percent scanning, respectively, for beta contamination upperwalls were not surveyed. The results of the scans are provided in Table 6. Readings were at or near background levels (see Table 5 for background levels). Fix:d Measurements Fixed measurements were performed using a beta gas-flow proportional counter having a 100 cm detector. 2 The counting time for fixed measurements was one (1) minute in all rooms. For fixed measurements, an appropriate background was determined for cach type of surface and subtracted from the survey readings. The readings were converted to dpm/100 cm using the efficiency of the detector. 2 The fixed measurements on the floor were taken in accordance with the survey plan and are provided in Figure 6. A total of 34, one-minute fixed measurements (rather than 11 measurements specified in the plan) were taken as indicated in Table 6. All were b310w the minimum detectable activity (MDA) and indicated that radiation levels are below release criteria for unrestricted use. Rimovable Contamination Surveys Removable contamination measurements (smears) were performed on all surfaces including the floors, walls, and overhead structures; including ducts, this also includes lights and support beams in accordance with the survey plan. Smear surveys consisted of using a Whatman Filter Paper (4.7 cm dia.) and wiping an area 2 of 100 cm. The smears were counted in GA's Health Physics Laboratory using a Canberra 2404 alpha / beta counter. A total of 59 smears taken. Each smear area was 100 cm and counted smears indicated activity 2 2 levels <10 dpm/100 cm alpha and < 10 dpm/100 crrf beta (Locations indicated in Figures 5 & 7 and the results are listed in Table 9). The locations where smears were collected on the floors are shown in Figure 7. Results of all removable contamination surveys are provided in Table 9. Radiation levels were below the release criteria (alpha and beta results were < 10 dpm/100 cm,) 2 Exposure Rate Measurements Direct radiation exposure rate measurements using a microR ( R) meter were taken in every room at randomly chosen areas. The radiation levels ranged from 14-22 R/hr, which were at or near background 6

hE PHASE 11 radiation levels of 12-21 R/hr (Table 4), well within the 10 R/hr above background at 1 meter from the surface limit. Additional Measurements Additional measurements were taken by health Physics personnel other than those who conducted the survey to verify that radiation levels were below the relcase criteria. Verification measurements in these three rooms indicated no significant changes (Table 7) when compared to the Final Survey results (Table 6). The same Geiger counter and Ludlum 2221 (p) instruments were used as in the Final Survey. Measurements for a contamination were also taken in the additional measurements. CONCLUSION Final contamination and radiation surveys provided in this report, designated as " Building 30- Phase 11" demonstrate that the Phase il areas meets the approved guidelines for release to unrestricted use. 7

PHASEI! TABLES 8

kM PHASE 11 Table 1: USNRC'S ACCEPTABLE SURFACE CONTAMINATION LEVELS ' Average **' Maximum 8 Removable **' 6 (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) 2 2 2 U-nat,23sU,23eU, & associated decay products 5,000 a 15,000 a 1,000 a Transuranic,22 era, 22 era,23 Th, 22eTh, 23'Pa, 100 300 20 227Ac,12sg,12ej Th-nat, n2Th, "Sr,223Ra, 22dRa,2 2U,12eg, is3g, ta'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 /gammammitting nuclides exists, the limits established for alpha, and beta / gamma-emitting nuclides should apply independent!y. b As used in this table dpm (disintegrations por minute) means the rate of emission by radioactive material as determined by correcting the counts per minute observed by an appropriate detector for background, efficiency, an geometric factors associated with the instrumentation. c Measurements of average contaminant shocY not be averaged over more than 1 square rneter. 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 8 of surface area should be determined by wiping that area with dry filter or soft absorbent paper, applying moderate pressure, and assessing the amount of radioactive material on the wipe with an appropnate 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 wtped. 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, rneasured through not more than 7 milligrams per square centimeter of total absorber. Guldelines For Decontamination of Facilities and Equipment Prior to Release for Unrestricted Use or Termination of Licenses For byproduct, Source, or Special Nuclear Material. USNRC, July 1982, incorporated into GA's SNM 696 license. 9

$M PHASE 11 Table 2: STATE OF CA ACCEPTABLE SURFACE CONTAMINATION LEVELS Average *d Maximum $d> Removable **' 2 2 2 (dpm/100cm ) (dpm/100cm ) (dprn/100cm ) _ U-nat,28U,2 8U, & associated decay 5,000 15,000 1,000 products Transuranic, 228Ra, 22 era, 2soTh, 22eTh, 100 300 20 23'Pa. 227Ac,12sg, treg Th-nat, 222Th, "Sr, 22sRa, 22'Ra, 2220, sael, 1,000 3,000 200 '22, '8'l 1 Bete / 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 ir. dependently. b As used in this table dpm (disintegrations per minute) means the rate of emission by radioactive material as determined by correcting the counts per minute observed by an appropriate detector for background, efficiency, an geometric factors associated with the instrumentation. c Measurements of average contaminant should not be averaged over more than 1 square meter. For objects of less surface area, the average should be derived for each such object. d The maximum contamination level applies to an area of not more than 100 cm. 8 The amount of removable radioactive materlat per 100 cm of surface area should be determined by 2 e ) 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-l. 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. I Guidelines For Decontamination of Facilities and Equiprnent Prior to Release for Unrestricted Use or Termination of Ucenses For byproduct, i Source, or Special Nuclear Material, also known as "Decon-1" incorporated into GA's State of CA Radioactive Materials Ucense. r l I j 10 1 .1

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hE PHASE il Table 4 Background pR Determinations for Various Types of Material Taken at GA Building 13 February 20,1998. S'* y Range of Location / No.of x n i s Exposure Rates Type of Surface Measurements at 1 Meter (pR/hr) Electrical Room,18 Floor-5 14.8 0.84 0.37 14 - 16 Concrete floor, ceiling, walls Outside Building 13,2nd floor;(concrete floors and 5 15.6 0.55 0.14 20-21 concrete block walls) Near Rooms 450-470. Open Mezzenine Area Outside East wing; Metal 5 15.2 0.45 0.10 15-16 Overhead, Cement Block \\ Walls and Floor. 3rd Floor Breezway Near West Entrance to Rooms 5 13.2 0.84 0.46 12-14 300-321. Service Corein Basement; Concrete Floor, Walls, 5 19.4 0.89 0.24 18-20 Ceiling with Pipes & Other Service Conduits. @ Mean of the Samples 2 Standard Deviation of the Samples 3 Acceptable Accuracy for Background Parameter 12

+M PHASEll TABLE 5: Background Measurements (cpm) 100 cm* beta detector (1 Minute Counts) ")

Background

Average of10 measurements MDA na Material (1 minutes each) (dgmitooem>> total counts i2 SD Drywall 272 i 11 269 0.14 Concrete Block wall 372123 312 0.34 Concrete 412i13 328 0.13 Linoleum over Concrete 271 i16 212 0.05 2 434 cm Floor Monitor Background Scan Results W Surface Beta / gamma Scan Range (counts per minute) Drywall 770-937 Concrete block wall 1174-1409 Concrete 1400-1570 Linoleum over Concrete N/A "8 Measurements taken January 19,1997. 13

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t i kE PHASE 11 TABLE 8: EXPOSURE RATE MEASUREMENTS Building 30fhase il Rooms Location Number of Range of Exposure Rates Measurements at 1 Meter (pRIhr) l Room 104 4 16 (All) Room 105A 4 14-15 Room 107 8 15-16 Room 108 13 14 - 17 i Rooms 108A, 14 16 - 22 111,112 Room 108 2 17 48 Annex Room 110 4 14 - 16 l ) l ? 17 I

hE PHASEH ) L Table 9: Results of Removable Contamination Surveys t Removable Activity Measurements Number of Maximum Activity Smears on sach rigure # Total Number (dpm/100 cm*) Surface of smears Alpha Beta Room 104 4F ' 5&7 6 <10 <10 C ng Room 105A 1 5&7 2 <10 <10 ng Room 107 8 Floor 4 Ceiling 5&7 16 <10 <10 4 Outside HVAC Duct Room 108 5 Floor 2 Ceiling 5&7 8 <10 <10 1 Inside HVAC Ducts Room 108 Annex 1 Floor 1 <10 <10 Room 108A, iii,112 9 Floor 5 Ceiling 5&7 14 <10 <10 I After tile was removed from all floon. I8

/ PHASEil I I FIGURES 19

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PHASE 11 APPENDIX 28

4M PHASE 11 ~ APPENDIX A BUILDING 30 PHASE il CHARACTERIZATION SURVEY PLAN November 25,1997 Laura Gonzales Paul R. Maschka Phase ll includes rooms 105A,107,104108,108A,108 Annex 110,111 and 112. The survey plan includes each of the above as separate rooms, but partitions have been removed making 108 and 110 one room, and 108A, iii, and 112 another large room. 1. Take large area masslinn smears for contamination on the floors and in the cable troughs. 2. Spot-check equipment being removed with direct radiation measurements and masslinn smears prior to removal from the facility. 3. After it is determined that the area is free of removable contamination; the floors will be swept and.the cab,a troughs will be cleaned (Facilities). 4. The clean equipment stored in rooms 104 and 107 will be removed (Facilities). 5. Take large area masslinn smears in rooms 104 and 107. 6. Scan, Beta only,50% of the tile in rooms 104 and 107 before removal. 7. Scan, Beta only,10*A of the concrete floors, including Rooms 104 and 107 after the tile is removed. Survey between the conduits in the trough in Rooms 108 and 110 with hand held instruments. 8. Scan, Beta only,10% of the walls up 2 meters. 9. Take 10 fixed radiation measurements (1 minute each) and 20 smears.

10. Take 30 direct radiation readings, im above the floor, at evenly spaced locations.

29

hE PHASE 11 l APPENDIX B - Final Survey Plan for Building 30 - Phase'll Rooms (Total of 2,422.4 fta a) Type of Survey 0 "* f (10 0 II' 140.4 ft8 327.7 M. 112) ' 81.5 M, 185 ft: ; 788.8 ft 899.8 ft s Floor 100% p scan Yes Yes Yes Yes Yes Yes Lower Walls (bottom Yes Yes Yes Yes Yes Yes 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) (Sce list)

  1. of Smears 2

1 2 5 9 1 (See List)

  1. cf MicroR '

MicroR readings were taken in all areas at random locations including the cable troughs. ~ Rxdings ' Cabla 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 M:asurements 30 _ _ _ _. _}}

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