ML21012A275

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Attachment a - General Atomics Triga Reactor Fssr Survey Unit Map
ML21012A275
Person / Time
Site: General Atomics
Issue date: 12/31/2020
From:
General Atomics
To: Marlayna Vaaler Doell
Reactor Decommissioning Branch
Doell M
Shared Package
ML21012A268 List:
References
38/67-5040
Download: ML21012A275 (50)
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Text

License Nos. R-38 & R-67 December 2020 General Atomics TRIGA Final Status Survey Report Attachment A Survey Unit Map

115 114 104 100 102 110 Conc.

Pad 109 111 112 113 106 105 107 108 101 101A H100 100B M2 Mezz M1 Mezz FormerMake UpWaterTank B27 Electrical Pad Equipment Pad CountingTrailer Janitor Bath room SU1(MarkIReactorPit)

SU2(MarkFReactorPit&Canal)

SU3(MarkIReactorRoom-FloorsandLowerWalls)

SU4(MarkIReactorRoom-UpperWalls&Ceiling)

SU5(MarkFReactorRoom-Floors&LowerWalls)

SU6(MarkFReactorRoomUpperWalls&Ceiling) 103 SU8(Mezzanine1)

SU9(Mezzanine2)

SU10(TRIGAWasteYard)

SU11(TRIGAFrontLot)

SU12(TRIGABackLot)

SU13(Room112) 11 10 8

3&4 5&6 2

1 SU14(PreviouslyReleased) 110 7

9 14 14 13 SU7(SoilLab) 14 12 TRIGASurveyUnits Nottoscale 16 MkIRoof MkFRoof SU15 SU15 SU15MkI&MkFRoof SU16SubcriticalPit&Trenches

License Nos. R-38 & R-67 December 2020 General Atomics TRIGA Final Status Survey Report Attachment B Maps of Survey Units

Degrees 180 270 90 0

0 Distance From Top 1.0M 2.0M 3.0M 4.0M 5.0M 0M 6.0M (pit floor)

N N

W S

E 180 270 90 0

0 2M (above floor)

N N

W S

E 6.56M (new pit floor)

X random = 0.443 Y random = 0.054 X starting pt. =28' 2"" x 0.443 = 12' 5" Y Starting pt. = 21"6" x 0.054 = 1' 2" Class 1, Spacing = 49" Area = 7.17 m2 (77.2 ft2)

Scale 0.34" = 1' 8

1 9

2 10 3

6 4

17 15 18 11 19 16 21 20 11 5

12 1

13 6

14 7

22 16 25 23 26 24 28 29 32 30 33 31 27 34 49" 49" N

37 36 38 35 49" 49" 23" 19" 40" 9"

63" 39" 39 TRIGA Mark I Reactor Pit Survey Unit 1

- Random Starting Point

- Systematic Location

- Judgmental Location

68 in.

Degrees 12" 41" 0

30 60 90 330 300 270 180 210 240 168 120 19" 150 38 in.

0 30 60 90 330 300 270 180 210 240 120 150 168 168 168 31" 13" 68 in.

0 30 60 90 330 300 270 180 210 240 120 150 168 0

30 60 90 330 300 270 180 210 240 168 120 150 168 4

6 3

5 2

1 15 17 14 16 13 12 26 28 25 27 24 23 32 34 31 33 30 29 39 41 38 40 37 35 36 42 49 53" 68" 68" 35" 64" 7 ft. 5 in. (2.26m) 10 ft.(3.05m) 4 ft.(1.21m) 6 ft.(1.83m) 10 9

11 8

7 21 20 22 19 18 55 3 ft.5 in. (1.07m) 0 M 1 M 2 M 3 M 4 M 5 M 6 M 7 M 8 M 6 ft.(1.83m) 4 ft.(1.21m) 10 ft.(3.05m) 7 ft. 5 in. (2.26m) 3 ft.5 in. (1.07m) 7 in.

10 in.

53 54 52 0

90 270 180 12 deg 168 210 240 330 30 60 120 15038.6"31.3"64"56"267 deg 106 deg 14" 46 47 48 43 44 45 56 300 9

+

0 50 51 Taken under ledge at 1.75 meters at 0 and 10 degrees respectively.

0 10 Distance From Deck in Meters 31 in.

- Random Starting Point

- Systematic Location

- Judgmental Location X random = 0.192 Y random = 0.220 X starting pt. = 62' 11" x 0.192 = 12' 1" Y Starting pt. = 27' 8" x 0.220 = 6' 1" Class 1, Spacing = 60" Area = 14.9 m2 (160 ft2)

Scale 0.25" = 1' TRIGA Mark F Reactor Pit & Canal Survey Unit 2 Floor Canal

106 102 X random = 0.558 Y random = 0.186 X starting pt. = 49' 7" x 0.558 = 27' 8" Y starting pt. = 40' 4" x 0.186 = 7' 6" Class 1, Spacing = 60" Area = 93.9 m2 (1,011 ft2)

Scale 0.18 = 1' TRIGA Mark I Reactor Room - Surfaces & Structures Below Two Meters Survey Unit 3 51" 39" 14 1

13 2

12 3

11 4

10 5

9 6

8 7

15 16 17 18 19 20 21 28 27 26 25 24 23 22 29 30 31 32 33 38 37 36 35 34 39 40 42 41 C

F H

K O

A C

H G

J I

M N

O K

L P

Q R

S T

E F

A 44 43 45 46 47 48 B

49 52 53 56 57 50 51 54 55 58 L

59 60 G

61 62 D

64 63 74 P

N 72 73 86 87 88 89 90 T

84 S

X 83 M

69 70 71 R

80 81 82 E

85 D

75 I

65 66 J

67 68 Q

78 77 79 76 92 93 94 91 95

- Random Starting Point

- Systematic Location

- Judgmental Location

TRIGA Mark I Reactor Room - Surfaces & Structures Above Two Meters Survey Unit 4 X random = 0.423 Y random = 0.756 X Starting = 672" x 0.423 = 293" Y Starting = 619" x 0.756 = 468" Class 1, Spacing = 96" Area = 93.9 m2 (1,011 ft2)

Scale 0.18 = 1' Ceiling height = 16' 8".

102 52" 60" 1

8 9

16 15 10 7

2 3

6 11 14 13 12 5

4 20 19 18 17 21 22 23 24 28 27 26 25 32 31 30 29 44" 36" 36 35 34 33 40 39 38 37 A

B A

B 4' 6" 3' 7" From Top From Top C

C

- Random Starting Point

- Systematic Location

X = 37' 9", Y = 43' 4" Random X = 0.475, Random Y = 0.465 X Starting Point = 38' 7" x 0.475 = 18' 4" Y Starting Point = 55' 2" x 0.465 = 25' 8" Class 1, Spacing = 5.0 ft.

Area = 98.84 m2 (1,064 ft2)

Scale 0.21" = 1' 9

10 11 12 8

7 3

1 2

4 5

6 14 13 16 19 18 17 30 28 29 31 32 57 55 56 58 59 37 33 35 39 41 43 25 27 26 24 23 22 38 34 36 42 44 40 62 64 63 61 60 A

B C

A B

C 49 48 47 46 45 50 51 52 53 54 67 68 69 70 71 80 79 78 77 76 81 82 83 84 85 72 73 74 75 66 65 TRIGA Mark F - Surfaces & Structures Below Two Meters Survey Unit 5 15 20 21 86 87 88 89 90 91 92 93 94 95 SU 5A Mark F Canal SU 2 Mark F Pit SU 2

- Random Starting Point

- Systematic Location

- Judgmental Location

10' 6'

1 10 2

11 3

12 4

13 5

14 6

15 7

8 9

24" 24" 24" 42" 38" 27" 7'

X = 84", Y = 120" Rand X = 0.670 Rand Y = 0.155 X Starting Pt. = 0.670

  • 84" = 56.25" Y Starting Pt. = 0.155
  • 120" = 18.63" Class 1 Area, Spacing = 24" Scale = 0.6" = 1' TRIGA Mark F - Excavated Area Survey Unit 5A

- Random Starting Point

- Systematic Location

X = 45' 10", Y = 52' 1" Random X = 0.786, Random Y = 0.465 X Starting Point = 45' 10" x 0.650 = 30' 4" Y Starting Point = 52' 1" x 0.392 = 20' 5" Class 1, Spacing = 8.0 ft.

Area = 98.84 m2 (1,064 ft2)

Scale 0.17" = 1' TRIGA Mark F - Surfaces & Structures Above Two Meters Survey Unit 6 Ceiling Height = 16' 8" A

A B

B C

C 2

4 1

3 6

8 5

7 9

11 10 12 60" 120" 28 29 27 72" 16 26 17 25 18 24 19 23 21 22 20 14 15 13 32 31 33 30 Ceiling Height = 9' 0" 42" 30" 36" 39" 12"

- Random Starting Point

- Systematic Location

TRIGA Soil Lab - Surfaces & Structures Below Two Meters Survey Unit 7 X = 48' 3", Y = 21' 9" Random X = 0.475, Random Y = 0.465 X Starting Point = 48' 3" x 0.692 = 33' 5" Y Starting Point = 21' 9" x 0.195 = 4' 3" Class 1, Spacing = 5.0 ft.

Area = 27.7 m2 (298 ft2)

Scale 0.3" = 1' 14 15 16 17 18 19 11 12 13 1

2 3

4 10 9

8 7

6 5

28 27 26 25 24 23 22 21 20 29 29" 36" Spacing = 5' 30 31 34 32 Hole in Wall 33

- Random Starting Point

- Systematic Location

- Judgmental Location

Mezzanine X random = 0.543 Y random = 0.827 X starting pt. = 37' 6" x 0.543 = 20' 4" Y starting pt. = 23' 5" x 0.827 = 19' 4" Class 1, Spacing = 47" Area = 23.6 m2 (254 ft2)

Scale 0.3" = 1' 1

5 2

6 30 34 31 35 38 13 39 14 28 10 25 9

3 36 4

37 32 29 33 27 26 15 16 12 8

11 7

22 21 20 19 17 41 18 24 40 23 23" 15" TRIGA Mezzanine 1 - Surfaces & Structures Below Two Meters Survey Unit 8 45 44 42 43 46 47 48 49 50 51

- Random Starting Point

- Systematic Location

- Judgmental Location

Mezzanine 2 X random = 0.419 Y random = 0.431 X starting pt. = 39' 9" x 0.419 = 16' 8" Y starting pt. = 26' 3" x 0.431 = 11' 4" Class 1, Spacing = 47" Area = 30.6 m2, (329 ft2)

Scale 0.3" = 1' 37 41 38 42 39 40 1

5 2

6 3

4 14 10 13 9

12 11 15 19 16 20 17 18 28 24 27 23 26 25 53 49 52 48 51 50 34 33 31 32 30 29 22 47 21 46 8

45 7

43 44 35 36 1' 8" 4' 6" TRIGA Mezzanine 2 - Surfaces & Structures Below Two Meters Survey Unit 9 54 55 Handle 58 56 57 59 Handle

- Random Starting Point

- Systematic Location

- Judgmental Location

14 23 13 24 28 4

27 5

16 21 15 22 30 2

29 3

12 25 9

26 6

8 7

18 19 17 20 33 32 31 1

X = 59' 5" Y = 23' 11" Random X = 0.701 Random Y = 0.920 X Starting Point = 59' 5" x 0.701 = 41' 8" Y Starting Point = 23' 11" x 0.920 = 22' 0" Class 1, Spacing = 6' 4" Area = 99.59 m2 (1,072 ft2)

Scale 0.2' = 1' 29" 24" 38 39 36 37 40 35 34 42 41 A

A B

B C

C Chain Link Fence Chain Link Fence Chain Link Fence TRIGA Waste Yard - Surfaces & Structures Below Two Meters Survey Unit 10 51 Trench 50 45 49 11 10 43 44 45 46 47 48

- Random Starting Point

- Systematic Location

- Judgmental Location

TRIGA Front Yard Survey Unit 11 25.3 m (83 ft.)

22.2 m (72.75 ft.)

23.5 m (77 ft.)

11.0 m (36 ft.)11.5 m (37.6 ft.)

33" 30" 12' 2

1 4

3 5

11 12 9

10 8

7 6

14 13 16 15 17 18 19 25 26 23 24 22 21 20 28 27 30 29 31 32 33 39 40 37 38 36 35 34 42 41 44 43 45 46 47 12' 49 51 52 50 48 X = 77', Y = 72' 6" Random X = 0.208 Random Y = 0.687 X Starting Point = 77" x 0.208 = 16' Y Starting Point = 72' 6" x 0.687 = 49' 9" Class 2, Spacing = 12' Area = 520.4 m2 (5,602 ft2)

Scale 3/32" = 1' 0"

- Random Starting Point

- Systematic Location

- Judgmental Location

115 114 109 111 113 Former Make-Up Water Tank 110 SU 14 SU 12 TRIGA Back Yard Survey Unit 12 24' 10' 32 34 26 25 24 23 22 21 20 19 18 17 16 15 14 13 8

9 10 11 12 4

5 6

7 1

2 3

27 28 33 X random = 0.476 Y random = 0.814 X Starting Pt. = 760" x 0.476 = 361.8" Y Starting Pt. = 1,040" x 0.814 = 90" Class 2, Spacing = 17' Area = 886 m2 (9,539 ft2)

Scale 1 = 19.4' 29 31 30

X random = 0.853 Y random = 0.674 X starting pt. = 32' 6" x 0.853 = 27' 8" Y staring pt. = 35' x 0.674 = 23' 7" Class 1, Spacing = 59" Area = 36.9 m2, (397 ft2)

Scale 0.26" = 1' TRIGA Room 112 - Surfaces & Structures Below Two Meters Survey Unit 13 18 19 14 15 11 12 10 22 20 21 16 17 13 35 8

7 9

23 33 34 5

6 4

24 32 31 2

1 3

25 29 30 27 28 26 4' 4" 2' 4" 36 37 38 39 40

- Random Starting Point

- Systematic Location

- Judgmental Location

109110111113114115 TRIGA Non-Impacted Areas Survey Unit 148765910111217181920232221242526273130292832333435 Spacing = 9' 108" 46" 84" 94"161514131234 75" 46"

- Sample Location Class 3 Area = 293.4 m2, (3,159 ft2)

Scale 0.14" = 1'

X random = 0.116 Y random = 0.842 X starting pt. = 86' 1" x 0.116 = 10' 0" Y starting pt. = 49' 0" x 0.842 = 41' 3" Class 2, Spacing = 96" Area = 339.0 m2 (3,649 ft2)

Scale 0.13 = 1' TRIGA Mark I Reactor Room - Mark I & Mark F Roof Survey Unit 15 60' 6" 24 6" 42' 6" 44' 48 33 32 17 16 1

47 34 31 18 15 2

46 35 30 19 14 3

45 36 29 20 13 4

44 37 28 21 12 5

43 38 27 22 11 6

42 39 26 23 10 7

41 40 25 24 9

8 61 60 55 54 49 62 59 56 53 50 63 58 57 52 51 70" 26" 48" 70" 108" 64 65 68 69 66 67 70 71 72 73

- Random Starting Point

- Systematic Location

- Judgmental Location

Room 109-110 Trench 37' 2'

9 10 1

2 11 12 3

4 5

6 7

8 Mark F Canal Track 9

10 1

2 11 12 3

4 5

6 15 16 13 14 15 16 Mark F Canal 10' 3" 4'

8' 6" 4'

4' 14' 6" Floor 6' 6" 2

3 4

1 5

6 0

90 180 270 180 Walls 20' 5" 12' 9" 9

11 10 7

8 14 16 15 12 13 TRIGA Mark F Sub-Critical Pit, Trench, and Mark F Canal Track Survey Unit 16 Sub-Critical Pit Post-remediation sample locations The trenches in Rooms 109-110 were not previously released and have been included in this survey.

Post-remediation sample locations Sub-Critical Pit = 294.6 ft2, (27.4 m2)

Trench (109-110) = 37 ft., (11.3m)

Mark F Canal = 92 ft2, (8.5 m2)

License Nos. R-38 & R-67 December 2020 General Atomics TRIGA Final Status Survey Report Attachment C Instrument Calibration Certificates

License Nos. R-38 & R-67 December 2020 General Atomics TRIGA Final Status Survey Report Attachment D Site Specific Background Measurements

General Atomics - TRIGA Decommissioning Attachment D Background Documentation July 15, 2019 to January 28, 2020 Probe Bkg 43-37 1781.4 43-37 2109.4 43-37 2782.1 43-37 1096.8 Probe Bkg 43-68 382.6 43-68 527.3 43-68 650.1 43-68 257.2 Probe Bkg 43-93 170.9 43-93 378.6 43-93 320.1 43-93 359.5 Probe Bkg 44-10 8388.0 Uncollimated 44-10 4410.4 Collimated Background Data 1772 1767 1776 1791 1749 1813 1806 1745 1821 1774 Average:

1781.4 cpm 2164 2099 2074 2148 2059 2151 2146 2035 2029 2189 Average:

2109.4 cpm 2853 2759 2770 2623 2639 2947 2819 2808 2861 2742 Average:

2782.1 1115 1135 1084 1116 1085 1089 1073 1030 1150 1091 Average:

1096.8 cpm Ambient Surface Counts (cpm)

Cinder block Surface Counts (cpm)

Concrete Surface Counts (cpm)

Metal Surface Counts (cpm)

Background Data (Static) #84510 Surface Ambient Cinder block Concrete Metal Background Data (Static) #84459 Surface Ambient Ludlum 2221 with 43-37 probe # (Floor Monitor)

Ambient Metal Background Data Meter #97817 Surface Ambient Cinder block Concrete Metal Background Data (Static) #97814 Surface Ambient Cinder block Concrete Ref. NUREG-1507 Background Data Page 1 of 2

General Atomics - TRIGA Decommissioning Attachment D Background Data 397 402 363 366 417 330 403 369 377 402 Average:

382.6 cpm 622 525 535 532 488 485 545 501 510 530 Average:

527.3 cpm 633 677 658 684 586 644 675 645 667 632 Average:

650.1 267 219 275 267 280 246 254 248 236 280 Average:

257.2 cpm Background Data 210 153 184 171 167 147 150 156 191 180 Average:

170.9 cpm 382 365 390 357 367 386 379 377 388 395 Average:

378.6 cpm 343 315 318 323 331 296 300 330 314 331 Average:

320.1 343 354 356 327 374 373 370 342 390 366 Average:

359.5 cpm Background Data 8250 8513 8352 8455 8365 8280 8441 8375 8462 8387 Average:

8388.0 cpm 4539 4801 4235 4326 4333 4313 4409 4455 4380 4313 Average:

4410.4 cpm Surface Counts (cpm)

Ambient - Collimated Ludlum 2221 with 44-10 collimated probe # (2x2 NaI)

Surface Counts (cpm)

Ambient - Uncollimated Concrete Surface Counts (cpm)

Metal Ludlum 2221 with 44-10 collimated probe # (2x2 NaI)

Ambient Surface Counts (cpm)

Cinder block Surface Counts (cpm)

Surface Counts (cpm)

Ambient Surface Counts (cpm)

Cinder block Surface Counts (cpm)

Concrete Surface Counts (cpm)

Metal Ludlum 2221 with 43-93 probe #

Surface Counts (cpm)

Ludlum 2221 with 43-68 probe #

Ref. NUREG-1507 Background Data Page 2 of 2

General Atomics - TRIGA Decommissioning Background Documentation January 29, 2020 to July 29, 2020 Probe Bkg 43-37 1850.1 43-37 2472.5 43-37 2908.9 43-37 1463.1 Probe Bkg 43-68 290.7 43-68 511.4 43-68 516.9 43-68 293.4 Probe Bkg 43-93 219.2 43-93 480.3 43-93 392.0 43-93 433.3 43-93 372.4 Probe Bkg 44-10 4095.0 Background Data 1872 1840 1888 1862 1850 1857 1955 1749 1813 1815 Average:

1850.1 cpm 2335 2333 2480 2495 2389 2554 2580 2601 2556 2402 Average:

2472.5 cpm 2881 2811 2775 2837 2990 2792 2920 2970 3171 2942 Average:

2908.9 1579 1508 1499 1416 1472 1467 1379 1433 1415 1463 Average:

1463.1 cpm Counts (cpm)

Metal Background Data (Static) #84459 Surface Ambient Ludlum 2221 with 43-37 probe # (Floor Monitor)

Ambient Surface Counts (cpm)

Cinder block Surface Counts (cpm)

Concrete Surface Ambient Cinder block Concrete Metal Roof Surface Counts (cpm)

Metal Background Data Meter #97817 Surface Ambient Cinder block Concrete Metal Background Data (Static) #97814 Surface Ambient Cinder block Concrete Background Data (Static) #84510 Surface Ref. NUREG-1507 Background Data Page 1 of 2

General Atomics - TRIGA Decommissioning Background Data 332 308 310 285 315 314 272 270 239 262 Average:

290.7 cpm 468 493 499 538 504 519 508 519 548 518 Average:

511.4 cpm 628 559 497 509 505 515 482 517 482 475 Average:

516.9 285 289 296 288 317 295 285 281 288 310 Average:

293.4 cpm Background Data 234 211 221 240 220 218 210 210 218 210 Average:

219.2 cpm 516 500 469 531 465 445 490 436 469 482 Average:

480.3 cpm 411 384 353 407 403 375 421 385 375 406 Average:

392.0 438 430 462 406 400 423 482 429 412 451 Average:

433.3 cpm 305 360 463 309 332 371 377 423 333 451 Average:

372.4 cpm Background Data 4293 4070 4135 3972 3952 3971 3997 4273 4150 4137 Average:

4095.0 cpm Ambient Surface Counts (cpm)

Metal Ludlum 2221 with 44-10 collimated probe # (2x2 NaI)

Surface Counts (cpm)

Roof Surface Counts (cpm)

Counts (cpm)

Cinder block Surface Counts (cpm)

Concrete Ludlum 2221 with 43-68 probe #

Surface Counts (cpm)

Ambient Surface Counts (cpm)

Cinder block Surface Counts (cpm)

Concrete Surface Counts (cpm)

Metal Ludlum 2221 with 43-93 probe #

Ambient Surface Surface Counts (cpm)

Ref. NUREG-1507 Background Data Page 2 of 2

License Nos. R-38 & R-67 December 2020 General Atomics TRIGA Final Status Survey Report Attachment E MDC Calculations

General Atomics - TRIGA Decommissioning Ref. NUREG-1507 MDA Worksheet Page 1 of 3 Minimum Detectable Concentration (MDC) Static Measurements (95% confidence level via NUREG 1507 method)

(Eq. 2)

Where:

Total Eff. =Total Efficiency [2pi efficiency

  • 0.5 (per ISO 7503-1)]

Rb =

Average background rate (cpm)

Ts+b =

Sample count time (minutes)

Tb =

Background count time (minutes)

P =

Probe area (cm2)

Static Count MDC Calculations Nuclide Total Eff.

Rb Ts+b Tb P

Sr-90/Cs-137 15.00%

1781.4 1

1 584 227.6 dpm/100 cm2 Ambient Sr-90/Cs-137 15.00%

2109.4 1

1 584 247.4 dpm/100 cm2 Cinder Block Sr-90/Cs-137 15.00%

2782.1 1

1 584 283.6 dpm/100 cm3 Concrete Sr-90/Cs-137 15.00%

1096.8 1

1 584 179.3 dpm/100 cm2 Metal Nuclide Total Eff.

Rb Ts+b Tb P

Sr-90/Cs-137 18.75%

382.6 1

1 126 397.9 dpm/100 cm2 Ambient Sr-90/Cs-137 18.75%

527.3 1

1 126 464.9 dpm/100 cm2 Cinder Block Sr-90/Cs-137 18.75%

650.1 1

1 126 514.8 dpm/100 cm3 Concrete Sr-90/Cs-137 18.75%

257.2 1

1 126 328.5 dpm/100 cm2 Metal Nuclide Total Eff.

Rb Ts+b Tb P

Sr-90/Cs-137 10.02%

170.9 1

1 100 637.0 dpm/100 cm2 Ambient Sr-90/Cs-137 10.02%

378.6 1

1 100 933.5 dpm/100 cm2 Cinder Block Sr-90/Cs-137 10.02%

320.1 1

1 100 860.7 dpm/100 cm3 Concrete Sr-90/Cs-137 10.02%

359.5 1

1 100 910.4 dpm/100 cm2 Metal Minimum Detectable Concentration (MDC) Scan Measurements (Scan MDA per NUREG-1575, NUREG-1507 methodology)

(Eq. 3)

MDC (Static)

Meter: 43-93 Meter: 43-37 MDC (Static)

Meter: 43-68 MDC (Static)

(

)(

)(

)

(

)(

)(

)

2 2

2 100 1

29

.3 3

)

100

/

(

cm cm area probe T

Eff T

T T

R cm dpm MDC b

s b

b s

b s

b

+

+

+

+

+

=

( )(

)

=

2 100cm A

p MDCR MDC Scan s

i

General Atomics - TRIGA Decommissioning Ref. NUREG-1507 MDA Worksheet Page 2 of 3 Where:

p =

surveyor efficiency, per NUREG 1507 (0.5) i =

total efficiency (2 geometry) s =

surface efficiency, 0.5 for gammas and high energy betas >400 keV (max) (e.g. Sr/Y-90, Cs-137, etc.),

0.25 for low energy betas (e.g. C-14, S-35, etc.)

A =

probe active area (cm2)

And, (Eq. 4)

Where:

MDCR = Minimum detectable count rate (cpm)

Si =

source counts in time interval, i.

And, (Eq. 5)

Where:

d =

1.38 for 95% true positive scan detection rate, per, NUREG 1507, Table 6.1 Bi =

Background counts in interval, i

And, (Eq. 6)

Where:

Pb =

probe background count rate (cpm) i =

observation interval Scan Minimum Detectable Concentration (MDC)

Calculations for Hand-Held Monitors (Scan MDC per NUREG-1575, NUREG-1507 methodology)

Specific Scan MDC calculation results:

Meter 43-37 Ambient Cinder Block Concrete Metal Pb =

1781.4 2109.4 2782.1 1096.8 cpm i =

2 2

2 2

sec Bi =

59.38 70.31 92.74 36.56 counts d =

1.38 1.38 1.38 1.38 Si =

10.63 11.57 13.29 8.34 counts MDCR =

319.0 347.2 398.7 250.3 cpm

(

)

sec min sec 60 i

S MDCR i

=

i i

B d

S

=

(

)( )(

)

sec 60 min 1

i P

B b

i =

General Atomics - TRIGA Decommissioning Ref. NUREG-1507 MDA Worksheet Page 3 of 3 Meter 43-68 Ambient Cinder Block Concrete Metal Pb =

382.6 527.3 650.1 257.2 cpm i =

2 2

2 2

sec Bi =

12.75 17.58 21.67 8.57 counts d =

1.38 1.38 1.38 1.38 Si =

4.93 5.79 6.42 4.04 counts MDCR =

147.8 173.6 192.7 121.2 cpm Meter 43-93 Ambient Cinder Block Concrete Metal Roof Pb =

170.9 378.6 320.1 359.5 0.0 cpm i =

2 2

2 2

2 sec Bi =

5.70 12.62 10.67 11.98 0.00 counts d =

1.38 1.38 1.38 1.38 1.38 Si =

3.29 4.90 4.51 4.78 0.00 counts MDCR =

98.8 147.1 135.2 143.3 0.0 cpm Scan MDC Calculations Meter: 43-37 Nuclide Area Sr-90/Cs-137 584 515.0 dpm/100 cm2 Ambient Sr-90/Cs-137 584 560.4 dpm/100 cm3 Cinder Block Sr-90/Cs-137 584 643.6 dpm/100 cm3 Concrete Sr-90/Cs-137 584 404.1 dpm/100 cm2 Metal Meter: 43-68 Nuclide Area Sr-90/Cs-137 126 885.0 dpm/100 cm2 Ambient Sr-90/Cs-137 126 1039.0 dpm/100 cm3 Cinder Block Sr-90/Cs-137 126 1153.6 dpm/100 cm3 Concrete Sr-90/Cs-137 126 725.6 dpm/100 cm2 Metal Meter: 43-93 Nuclide Area Sr-90/Cs-137 100 1394.6 dpm/100 cm2 Ambient Sr-90/Cs-137 100 2075.8 dpm/100 cm3 Cinder Block Sr-90/Cs-137 100 1908.7 dpm/100 cm3 Concrete Sr-90/Cs-137 100 2022.7 dpm/100 cm2 Metal 10.02%

18.75%

Total Efficiency MDC (Scan) 10.02%

10.02%

10.02%

18.75%

Total Efficiency MDC (Scan) 15.00%

15.00%

15.00%

15.00%

Total Efficiency MDC (Scan) 18.75%

18.75%

General Atomics - TRIGA Decommissioning Ref. NUREG-1507 MDA Worksheet Page 1 of 3 Minimum Detectable Concentration (MDC) Static Measurements (95% confidence level via NUREG 1507 method)

(Eq. 2)

Where:

Total Eff. =Total Efficiency [2pi efficiency

  • 0.5 (per ISO 7503-1)]

Rb =

Average background rate (cpm)

Ts+b =

Sample count time (minutes)

Tb =

Background count time (minutes)

P =

Probe area (cm2)

Static Count MDC Calculations Nuclide Total Eff.

Rb Ts+b Tb P

Sr-90/Cs-137 17.85%

1850.1 1

1 584 194.9 dpm/100 cm2 Ambient Sr-90/Cs-137 17.85%

2472.5 1

1 584 224.8 dpm/100 cm2 Cinder Block Sr-90/Cs-137 17.85%

2908.9 1

1 584 243.6 dpm/100 cm3 Concrete Sr-90/Cs-137 17.85%

1463.1 1

1 584 173.6 dpm/100 cm2 Metal Nuclide Total Eff.

Rb Ts+b Tb P

Sr-90/Cs-137 16.50%

290.7 1

1 126 396.0 dpm/100 cm2 Ambient Sr-90/Cs-137 16.50%

511.4 1

1 126 520.5 dpm/100 cm2 Cinder Block Sr-90/Cs-137 16.50%

516.9 1

1 126 523.2 dpm/100 cm3 Concrete Sr-90/Cs-137 16.50%

293.4 1

1 126 397.8 dpm/100 cm2 Metal Nuclide Total Eff.

Rb Ts+b Tb P

Sr-90/Cs-137 12.50%

219.2 1

1 100 575.1 dpm/100 cm2 Ambient Sr-90/Cs-137 12.50%

480.3 1

1 100 839.8 dpm/100 cm2 Cinder Block Sr-90/Cs-137 12.50%

392.0 1

1 100 761.0 dpm/100 cm3 Concrete Sr-90/Cs-137 12.50%

433.3 1

1 100 798.8 dpm/100 cm2 Metal Sr-90/Cs-137 12.50%

372.4 1

1 100 742.3 dpm/100 cm2 Roof Minimum Detectable Concentration (MDC) Scan Measurements (Scan MDA per NUREG-1575, NUREG-1507 methodology)

(Eq. 3)

MDC (Static)

Meter: 43-93 Meter: 43-37 MDC (Static)

Meter: 43-68 MDC (Static)

(

)(

)(

)

(

)(

)(

)

2 2

2 100 1

29

.3 3

)

100

/

(

cm cm area probe T

Eff T

T T

R cm dpm MDC b

s b

b s

b s

b

+

+

+

+

+

=

( )(

)

=

2 100cm A

p MDCR MDC Scan s

i

General Atomics - TRIGA Decommissioning Ref. NUREG-1507 MDA Worksheet Page 2 of 3 Where:

p =

surveyor efficiency, per NUREG 1507 (0.5) i =

total efficiency (2 geometry) s =

surface efficiency, 0.5 for gammas and high energy betas >400 keV (max) (e.g. Sr/Y-90, Cs-137, etc.),

0.25 for low energy betas (e.g. C-14, S-35, etc.)

A =

probe active area (cm2)

And, (Eq. 4)

Where:

MDCR = Minimum detectable count rate (cpm)

Si =

source counts in time interval, i.

And, (Eq. 5)

Where:

d =

1.38 for 95% true positive scan detection rate, per, NUREG 1507, Table 6.1 Bi =

Background counts in interval, i

And, (Eq. 6)

Where:

Pb =

probe background count rate (cpm) i =

observation interval Scan Minimum Detectable Concentration (MDC)

Calculations for Hand-Held Monitors (Scan MDC per NUREG-1575, NUREG-1507 methodology)

Specific Scan MDC calculation results:

Meter 43-37 Ambient Cinder Block Concrete Metal Pb =

1850.1 2472.5 2908.9 1463.1 cpm i =

2 2

2 2

sec Bi =

61.67 82.42 96.96 48.77 counts d =

1.38 1.38 1.38 1.38 Si =

10.84 12.53 13.59 9.64 counts MDCR =

325.1 375.8 407.7 289.1 cpm

(

)

sec min sec 60 i

S MDCR i

=

i i

B d

S

=

(

)( )(

)

sec 60 min 1

i P

B b

i =

General Atomics - TRIGA Decommissioning Ref. NUREG-1507 MDA Worksheet Page 3 of 3 Meter 43-68 Ambient Cinder Block Concrete Metal Pb =

290.7 511.4 516.9 293.4 cpm i =

2 2

2 2

sec Bi =

9.69 17.05 17.23 9.78 counts d =

1.38 1.38 1.38 1.38 Si =

4.30 5.70 5.73 4.32 counts MDCR =

128.9 170.9 171.8 129.5 cpm Meter 43-93 Ambient Cinder Block Concrete Metal Roof Pb =

219.2 480.3 392.0 433.3 372.4 cpm i =

2 2

2 2

2 sec Bi =

7.31 16.01 13.07 14.44 12.41 counts d =

1.38 1.38 1.38 1.38 1.38 Si =

3.73 5.52 4.99 5.24 4.86 counts MDCR =

111.9 165.7 149.7 157.3 145.9 cpm Scan MDC Calculations Meter: 43-37 Nuclide Area Sr-90/Cs-137 584 441.1 dpm/100 cm2 Ambient Sr-90/Cs-137 584 509.9 dpm/100 cm3 Cinder Block Sr-90/Cs-137 584 553.1 dpm/100 cm3 Concrete Sr-90/Cs-137 584 392.2 dpm/100 cm2 Metal Meter: 43-68 Nuclide Area Sr-90/Cs-137 126 876.6 dpm/100 cm2 Ambient Sr-90/Cs-137 126 1162.7 dpm/100 cm3 Cinder Block Sr-90/Cs-137 126 1169.0 dpm/100 cm3 Concrete Sr-90/Cs-137 126 880.7 dpm/100 cm2 Metal Meter: 43-93 Nuclide Area Sr-90/Cs-137 100 1579.5 dpm/100 cm2 Ambient Sr-90/Cs-137 100 2338.0 dpm/100 cm3 Cinder Block Sr-90/Cs-137 100 2112.2 dpm/100 cm3 Concrete Sr-90/Cs-137 100 2220.7 dpm/100 cm2 Metal Sr-90/Cs-137 100 2058.7 dpm/100 cm3 Roof 10.02%

10.02%

10.02%

16.50%

16.50%

Total Efficiency MDC (Scan) 10.02%

10.02%

16.50%

Total Efficiency MDC (Scan) 17.85%

17.85%

17.85%

17.85%

Total Efficiency MDC (Scan) 16.50%

License Nos. R-38 & R-67 December 2020 General Atomics TRIGA Final Status Survey Report Attachment F Example Survey Unit Package Instructions

Final Status Survey Package Building: 21 TRIGA Survey Unit #: 3 (MkI Reactor Room)

Page __1__ of __3__

Classification:

Class 1 - Impacted Class 2 - Impacted Class 3 - Impacted Survey Type:

Characterization Final Status Survey Applicable Nuclides of Concern:

Nuclide 137Cs 60Co 152Eu 154Eu DCGLW (dpm/100cm2) 5,000 NA NA NA Action Level (dpm/100cm2) 5,000 NA NA NA Applicable Survey Unit Surfaces:

% of Surface Requiring Scan Surveys Floors 25%

50%

100%

N/A Lower walls 25%

50%

100%

N/A Upper Walls 25%

50%

100%

N/A Ceilings 25%

50%

100%

N/A RAM Use and Storage Areas 25%

50%

100%

N/A Structures (Permanent Furnishings) Interior and Exterior Surfaces 25%

50%

100%

N/A Required Survey Instrumentation Measurement Type Static Count Time Scan Rate Limiting2 Beta Nuclide Limiting2 Gamma Nuclide Typical MDCR (cpm)

Ludlum 2221 w/ 43-37 Beta NA 4

inches/sec.

137Cs NA Ludlum 2221 w/ 43-68 Beta NA 2

inches/sec.

137Cs NA Ludlum 2221 w/ 43-93 Beta 1 min.

NA 137Cs NA NA Other: _______________

(Specify)

A low background Tennelec Alpha/Beta counter shall be used for analysis of any required removable contamination measurements. See General Survey Instructions item # 7.

1 Since this instrumentation is non-nuclide specific (gross measurements), the applicable efficiency and DCGLW values have been selected based on the most limiting nuclides of concern for the survey unit.

Final Status Survey Package General Survey Instructions:

Page __2__ of __3__

1.

Perform scan surveys of the required surface area at the prescribed scan rates. If less than a 100% scan is required, use professional judgment to select the areas scan surveyed. Select areas with the highest probability to contain residual activity (i.e., areas of known radionuclide usage, floor traffic pathways, cracks and/or crevices not easily cleaned, counter top workspaces, storage locations, stained or water spotted areas, or areas with a known history of contamination).

2.

If elevated activity is detected during the scan surveys, then establish the extent (size) of the contaminated area(s) and mark the affected area(s) and quantify the activity by taking static measurements of the affected area(s). Notify the Project Manager or designee of the type, amount and extent of any contamination.

3.

Document all scan survey results on the applicable survey maps and data results sheets.

4.

The established number of static measurement locations needed for the statistical evaluation of this survey unit is

20. However, due to statistical and geometrical considerations, the actual number of locations may vary. In this case, collect the actual locations provided on the survey map whether this number is greater than or less than 20.

In addition to the random static measurement locations, use professional judgment to select an additional 5-10 survey locations (include vertical surfaces). Take static measurements and wipes at those locations.

5.

Locate and mark the required static measurements locations using the survey map(s). Survey Maps with sufficient detail to measure and locate all of these locations have been provided.

6.

Collect all required static measurements and document the results on the associated data results sheets.

Additional static measurements may be taken in suspect areas at the discretion of the Project Manager or survey technician. However, these additional locations are not included in the analysis of the statistical sample set.

7.

Removable contamination measurements (swipes) shall be performed at the established measurement locations and analyzed by the Tennelec Alpha/Beta system.

8.

Notify the Project Manager or designee if elevated activity is detected by any of the static measurements or applicable removable contamination measurements.

9.

Ensure that all package information is completed and signed prior to turning in this Survey Package to the RSO or designee for review.

10.

Perform a removable contamination survey of the internal surfaces of each drain, vacuum system nozzle, and ventilation exhaust duct located within the survey unit.

Special Survey Instructions:

Action Levels for each Meter/Probe Ludlum 2221 w/ 43-68 Ambient - 1,320 cpm Concrete - 1,588 cpm Metal - 1,195 cpm Cinder Block - 1,465 cpm Ludlum 2221 w/ 43-37 Ambient - 2,674 cpm Concrete - 3,695 cpm Metal - 1,989 cpm Cinder Block - 3,002 cpm

Final Status Survey Package Location Code Description (Soil Sampling Only)

A unique location code shall be assigned to each individual survey location to ensure proper data management of the survey results. The following format shall be used to ensure consistency throughout the final status survey process:

BB-RR-MMMM-LL-DD Where:

BB

=

Building or area code. This field represents the facility area. This will be the building number or an assigned area number. (2 characters)

RR

=

Survey unit ID code. (2 characters)

MMMM

=

Matrix type (Concrete = CONC, Soil = SOIL)

LL

=

Numerical identification number. This field represents the survey point assigned numerical identifier. The field 01 means survey point location number 1. Numerical Identifiers shall not be duplicated within the same survey unit. (2-characters)

DD

=

Depth of soil sample - 06 is six inches, 12 is 12 inches. (2 characters)

Prepared By: _______________________________________________

Date: ________________

Printed Name/Signature Reviewed By: _______________________________________________

Date: ________________

Printed Name/Signature Package Complete: __________________________________________

Date: ________________

Printed Name/Signature

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