ML090930073
| ML090930073 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 10/28/2008 |
| From: | Donna Anderson Sacramento Municipal Utility District (SMUD) |
| To: | NRC/FSME |
| Shared Package | |
| ML090830613 | List:
|
| References | |
| DPG 09-097 | |
| Download: ML090930073 (25) | |
Text
Rancho Seco Final Status Survey Summary Report October 9, 2008 Reactor Building, Interior Walls, (+) 75' El. to (+)115' El.
Survey Unit F8110111 Prepared By: _ __ _ Date: /o/**cc FSS Engineer Reviewed By: Date: 10 Iz 05 Lead FSS Engineer Approved By: '2 Date: -
Dismantlement Supeýýintendent, Radiological
FINAL STATUS SURVEY
SUMMARY
REPORT Survey Unit:
F81 10111, Reactor Building, Interior Walls, (+) 75' El. to (+) 115' El.
Survey Unit
Description:
Operating History: The reinforced concrete structure contained the reactor and supporting systems. The building contained four main elevations. Residual radioactive material was known to be present on all levels of the interior of the building. Operating records and the HSA document several events with the potential for a release of radioactivity inside this structure. No events documenting exterior contamination were found.
Site Characterization: Direct measurements were made of each of the interior elevation surfaces as well as the exterior surfaces of the structure. These measurements confirmed the presence of plant-derived. radionuclides. Direct me asurements on the (-) 27' elevation showed a mean gross activity level of 1,535,383 dpm/100 cm 2 and a maximum value of 8,134,000 dpm/100 cm2. Direct measurements on the grade elevation showed a mean gross activity level of 201,670 dpm/100 cm 2 and a maximum value of 370,000 dpm/ 100 cm 2. Direct measurements on the (+) 40' elevation showed a mean gross activity level of 51,521 dpm/100 cm 2 and a maximum value of 99,150 dpm/100 cm2.
Direct measurements on the (+) 60' elevation showed a mean gross activity level 'of 20,110 dpm/100 cm 2 and a maximum value of 46,660 dpm/100 cm 2 . Direct measurements on the exterior roof showed a mean gross activity level of 1,364 dpm/1 00 cm2 and a maximum value of 1,57.1 dpm/100 cm 2 . Based on the classification procedure (DSIP-0020) and levels of gross activity reported, the interior of the reactor building was determined to be a Class 1 area and the exterior was a Class 3.
HSA Events: HSA Report pg. 63.
Survey Unit Design Information:
The Survey Unit Design Parameters are presented in Table 1 below. The survey unit and measurement locations are depicted on the maps in Attachment 1. Direct measurement locations were determined using a fixed grid pattern and 1,966 m2 were scanned for 100% coverage. Samples of removable contamination were collected. The instrumentation used for the survey along with the MDC values are listed in Tables 2-1 and 2-2 in Attachment 2.
Page 2 of 12 FSS Summary Report F81 10111
Table 1. Survey Unit Design Parameters Survey Design Value Comment Parameter Survey Area: F811 Reactor Building, Interior Walls, (+) 75' El. to
(+) 115' El.
Survey Unit: 0111 Structure Surface Class: 1 LTP Table 5-4 SU Area (m2): 1,966 Evaluator: D. Anderson DCGL (dpm/100 cm 2): 43,000 Gross Activity DCGL Area Factor: 14.9 Class 1 (for I m 2)
Design DCGLemc 640,700 Based-on 1 m 2 at the edge 2
(dpm/100 cm ): of the 19.6 m2 field of view LBGR 2 (dpm/100 cm ): 21,500 Default = 50% DCGL Design Sigma 2 (dpm/100 cm ): 33,040 DTBD-06-001, Table 5-4D Type I Error: 0.05 Type II Error: 0.05 Predominant Nuclide: Cs-137 Sample Area (m2): 19.6 Class 1 Scan Area 2 (M ): 1,966 Scan Coverage (%): 100% Class 1 Zl_*t :
1.645 Zj-P : 1.645 Sign P: 0.725747 Calculated Relative Shift: 0.6 Relative Shift Used: 0.6 Uses 3.0 if Relative Shift is
>3 N-Value: 54 Design N-Value + 20%: 65 NUREG- 1575 Table 5-5 Design Min Samples N: 180 Class 1 Grid Spacin2 L: N/A Class 1 Page 3 of 12 FSS Summary Report F81 10111
Survey Results:
A total of 180 direct measurements were made in F8 110111. The results including mean, median, standard deviation and range are shown in Table 2. All direct measurements were less than the DCGL. None of the ISOCS gamma measurements on the interior wall surfaces indicated areas of elevated activity. Co-60 was not identified above the MDC.
Beta scan activity on the crane rail supports ranged from 3,564 to 41,945 dpm/100 cm2 ,
based on a surveyor efficiency of 0.5 and no background subtracted. Samples for removable surface activity were all less than 10% 'of the DCGL as shown in Table 3.
Removable surface activity samples were counted for alpha activity and none was detected at the MDC shown in Table 2-1 of Attachment 2.
Table 2. Direct Measurement Results Measurement ID Gross Activiy Uncertainty (dpm/100 cm ) (dpmll00 cm 2)
F8110111-MOOOIGS < 954 F8110111-MOO02GS 5,881 1,021 F8110111-MOO03GS 10,365 1,575 F8110111-MOO04GS 4,195 811 F8110111-MOO05GS 4,646 875 F8110111-MOO06GS 2,920 652 F8110111-MOO07GS 2,356 583 F8110111-MOO08GS 7,189 1,185 F8110111-MOO09GS 3,701 759 F8110111-MOOlOGS < 863 F8110111-MOOlIGS 679 325 F8110111-MOO12GS 880 367 F8110111-MOO13GS 2,151 550 F8110111-MOO14GS < 1,030 F8110111-MOO15GS 1,195 422 F8110111-MOO16GS 1,087 397 F8110111-MO017GS < 904 F8110111-MO018GS 1,831 497 F8110111 -MO019GS 1,081 369 F8110111-M0020GS < 800 F8110111-M0021GS < 710 F8110111-M0022GS < 826 F8110111-MOO23GS 1,828 492 F8110111-M0024GS < 886 F8110111-M0025GS 1,484 455 F8110111-M0026GS 2,399 569 F8110111-M0027GS 1,365 427 F8110111-M0028GS 1,479 459 F8110111-M0029GS < 787 F8110111-M0030GS < 703 F8110111-M0031GS < 794 F8110111-M0032GS < 970 F8110111 -M0033GS 2,470 603 F8110111-M0034GS < 991 F8110111-M0035GS 1,757 514 Page 4 of 12 FSS Summary Report F81 10111
Measurement ID Gross Activit Uncertainty (dpm/100 cm ) (dpm/100 cm 2)
F8110111-M0036GS 1,903 529 F8110111-MOO37GS < 975 F8110111-M0038GS 2,146 539 F8110111-M0039GS 696 327 F8110111-M0040GS < 767 F8110111-M0041GS < 746 F8110111-MOO42GS < 980 F8110111-M0043GS 2,406 595 F8110111-M0044GS < 1,080 F8110111-M0045GS < 1,140 F8110111-M0046GS 4,990 918 F8110111.-M0047GS 4,737 879 F8110111-M0048GS 8,115 1,301 F8110111-M0049GS 3,605 732 F8110111-MOOSOGS 1,784 495 F8110111-M0051GS 1,022 374 F8110111-MOO52GS 3,176 683 F8110111 -MOO53GS 9,660 1,492 F8110111-MOO54GS 6,439 1,094 F8110111-MOO55GS 7,838 1,265 F8110111-MOO56GS 3,410 711 F8110111-MOO57GS 1,990 529 F8110111-MOO58GS 3,222 679 F8110111-MOO59GS 1,220 401 F8110111-MOO60GS < 717 F8110111-M0061GS < 845 F8110111-M0062GS < 991 F8110111-M0063GS 4,360 831.
F8110111-M0064GS 1,591 469 F8110111-M0065GS 1,536 450 F8110111-M0066GS 5,435 970 F8110111-M0067GS 4,360 845 F8110111-M0068GS 17,259 2,410 F8110111-M0069GS 3,324 714 F8110111-M0070GS < 1,010 F8110111-M0071GS 1,536 449 F8110111-MOO72GS 3,420 707 F8110111-MOO73GS 14,784 2,112 F8110111-M0074GS 5,804 1,018 F8110111-MOO75GS 8,278 1,322 F8110111-M0076GS 2,552 593 F8110111-M0077GS 2,432 587 F8110111-M0078GS 4,626 865 F8110111-MOO79GS 1,761 487 F8110111-MOO80GS < 832 F8110111-MOO81GS < 800 F8110111-M0082GS 2,198 . 559 F8110111-MOO83GS 3,649 735 F8110111-M0084GS 1,960 520 F8110111-M0085GS 1,171 408 F8110111-MOO86GS 2,485 580 F8110111-MOO87GS 2,591 598 Page 5 of 12 FSS Summary Report F81 10111
Measurement ID Gross Activit Uncertainty (dpm/100 cm ) (dpm/100 cm 2 )
F8110111-M0088GS 3,274 692 F8110111-MOO89GS 1,366 418 F8110111-MOO90GS < 800 F8110111-MOO91GS 593 306 F8110111-MOO92GS 708 350 F8110111-MOO93GS 1,946 512 F8110111-MOO94GS 1,439 434 F8110111-MOO95GS 2,650 615 F8110111-MOO96GS 1,732 477 F8110111-MOO97GS 1,040 366 F8110111-MOO98GS 2,009 526 F8110111-MOO99GS 704 313 F8110111-MO100GS 572 324 F8110111-MO101GS 541 314 F8110111-MO102GS 1,012 376 F8110111-MO103GS 2,565 598 F8110111-MO104GS 863 340 F8110111-MO105GS 1,629 475 F8110111-MO106GS 4,494 857 F8110111-MO107GS 3,574 731 F8110111-MO108GS 6,443 1,085 F8110111-MO109GS 1,946 511 F8110111-MOIIOGS 1,829 500 F8110111-MO111GS 2,703 606 F8110111-MO112GS 3,586 739 F8110111-MO113GS 8,381 1,327 F8110111-MO114GS 5,946 1,036 F8110111-MO115GS 8,597 1,356 F8110111-MO116GS 3,462 715 F8110111-MOI7GS 2,989 654 F8110111-MO118GS 6,461 1,092 F8110111-MO119GS 4,481 853 F8110111-MO120GS 1,187 408 F8110111-MO121GS 1,182 409 F8110111-MOI22GS 6,754 1,142 F8110111-MOI23GS 8,120 1,298 F8110111-MOI24GS 4,056 782.
F8110111-MOI25GS 6,321 1,082 F8110111-MO126GS 5,681 1,000 F8110111-MO127GS 5,169 938 F8110111-MO128GS 10,557 1,597 F8110111-MO129GS 12,871 1,881 F8110111-MOI30GS 1,614 483 F8110111-MO131GS 2,056 530 F8110111-MO132GS 14,446 2,071 F8110111-MO133GS 13,344 1,941 F8110111-MO134GS 5,441 978 F8110111-MO135GS 9,072 1,420 F8110111-MO136GS 6,432 1,099 F8110111-MO137GS 5,138 937 F8110111-MO138GS 9,935 1,525 F8110111-MO139GS 5,139 941 Page 6 of 12 FSS Summary Report F81 10111
Measurement ID Gross Activity Uncertainty (dpm/100 cm ) (dpm/100 cm 2)
F8110111-MO140GS 1,145 406 F8110111-M0141GS 720 331 F8110111-MO142GS 1,553 456 F8110111-MO143GS 2,994 666 F8110111-MO144GS 1,438 450 F8110111-MO145GS 2,502 587 F8110111-MO146GS 1,516 446 F8110111-MO147GS 702 335 F8110111-M0148GS 2,773 618 F8110111-MO149GS < 857 F8110111-MO150GS < 687 F8110111-MO151GS < 794 F8110111-M0152GS < 910 F8110111-MO153GS 2,240 536 F8110111-MO154GS 860 368 F8110111-MO155GS 994 390 F8110111-MO156GS 1,418 441 F8110111-MO157GS 1,251 422 F8110111-MO158GS 2,068 511 F8110111-MOI59GS 1,076 380 F8110111-MO160GS 608 306 F8110111-MO161GS < 838 F8110111-MO162GS 1,004 387 F8110111-MO163GS 3,198 686 F8110111-MO164GS 1,324 410 F8110111-MO165GS 988 392 F8110111-MO166GS 754 317 F8110111-MO167GS 915 360 F8110111-MO168GS 2,234 578 F8110111-MO169GS < 826 F8110111-MO170GS < 826 F8110111-MO171GS < 838 F8110111-MO172GS 1,163 393 F8110111-MO173GS 2,337 571 F8110111-MO174GS < 857 F8110111-M0175GS 1,312 414 F8110111-MO176GS 3,031 654 F8110111-MO177GS 3,061 664 F8110111-MO178GS 4,705 875 F8110111-MO179GS 2,667 614 F8110111-MO180GS 1,153 395 Mean: 2,992 Median: 1,830 Standard Deviation: 3,012 Ranqe: 541 to 17.259 Page 7 of 12 FSS Summary Report F81 10111
Table 3. Removable Surface Activity Results Measurement ID Surface Beta Activity (dpm/100 cm 2)
F8110111-MOO01SM 153.39 F8110111-MOOO2SM 69.45 F8110111-MOOO3SM 7.46 F8110111-MOO04SM 135.31 F8110111-MOO05SM 13.91 F8110111-MOO06SM 20.37 F8110111-MOO07SM 24.24 F8110111-MOO08SM 20.37 F8110111-MOO09SM 4.87 F8110111-MOO01SM 13.91 F8110111-MOOIISM 12.62 F8110111-MOO12SM 10.04 F8110111-MOO13SM 6.16 F8110111-MOO14SM 8.75 F8110111-MOO15SM 11.33 F811:0111-MOO16SM 21.66 F8110111-MOO17SM 37.16 F8110111-MOO18SM 4.87 F8110111-MOO19SM 122.39 F8110111-MOO2OSM 168.89 F8110111-MOO21SM 698.38 F8110111-MOO22SM 152.10 F8110111-MOO23SM 42.33 F8110111-MOO24SM 131.43 F8110111-MOO25SM 79.78 F8110111-MOO26SM 44.91 F8110111-MOO27SM 471.09 F8110111-MOO28SM 128.85 F8110111-MOO29SM 493.04 F8110111-MOO30SM 409.10 F8110111-M0031SM 131.43 F8110111-MOO32SM 60.41 F8110111-MOO33SM 59.11 F8110111-MOO34SM 39.74 F8110111-M0035SM 113.35 F8110111-MOO36SM 139.18 F8110111-MOO37SM 25.54 F8110111-M0038SM 16.50 F8110111-M0039SM 22.95 F8110111-MOO40SM 90.11 F8110111-MOO41SM 38.45 F8110111-M0042SM 20.37 F8110111-MOO43SM 246.37 F8110111-M0044SM 143.06 F8110111-MOO45SM 101.73 F8110111-M0046SM 65.57 F8110111-M0047SM 115.94 F8110111-MOO48SM 16.50 Page 8 of 12 FSS Summary Report F81 10111
Measurement ID Surface Beta Activity (dpm/100 cm 2 )
F8110111-MOO49SM 165.01 F8110111-MOO50SM 21.66 F8110111-MOO51SM 95.27 F8110111-MOO52SM 229.58 F8110111-MOO53SM 427.18 F8110111-MOO54SM 13.91 F8110111-MOO55SM 265.75 F8110111-M0056SM 44.91 F8110111-MOO57SM 74.61 F8110111-MOO58SM 48.78 F8110111-MOO59SM 26.83 F8110111-MOO60SM 68.15 F8110111-MOO61SM 15.20 F8110111-MOO62SM 16.50 F8110111-MOO63SM 15.20 F8110111-MOO64SM 60.41 F8110111-MOO65SM 16.50 F8110111-M0066SM .84.94 F8110111-MOO67SM 12.62 F8110111-M0068SM 39.74 F8110111-MOO69SM 21.66 F8110111-MOO70SM 46.20 F8110111-MOO71SM 46.20 F8110111-M0072SM 136.60 Mean: 96.64 Median: 46.2 Standard Deviation: 129.12 Range: 4.87 to 698.38 Page 9 of 12 FSS Summary Report F81 10111
Survey Unit Data Assessment:
The survey design required 180 direct measurements for the Sign Test. The critical value and the results of the Sign Test are presented in Table 4. The sample mean and median values were less than the DCGL. The sample standard deviation was less than the design standard deviation so no additional samples were required.
Page 10 of 12 FSS Summary Report F81 10111
Table 4. Data Assessment Results Survey Results Parameter Value Comment Material Background Used (dpm/100 cm 2): N/A Ambient Background\Used (dprn/100 cm 2): N/A Average Ambient BKG = 0 Actual Direct Measurements (N): 180 Median (dpm/100 cm 2): 1,830 Mean (dpm/100 cm 2): 2,992 Direct Measurement Standard Deviation 3,012 2
(dpm/100 cm ):
Total Standard Deviation (dpm/100 cm 2): 3,012 Based on samples and backgrounds.
Maximum (dpm/100 cm2): 17,259 Material Type: N/A Background Subtract Not Applied Sign Test Final N Value: 180 S+ Value: 180 Critical Value: 101 Sufficient Samples Collected: Yes Maximum Value < DCGL: Yes Median Value < DCGL: Yes Mean Value < DCGL: Yes Maximum Value < DCGLemc: Yes Class 1 Total Standard Deviation <= Sigma: Yes Pass the Sign Test? Yes Reject the Null Hypothesis? Yes Does the Survey Unit Pass All Criteria? Yes Page I I of 12 FSS Summary Report F81 10111
Survey Unit Investigations and Results:
No investigations were required for either direct or scan measurements and no investigation results are reported.
ALARA Statement:
As stated in Chapter 4 of the LTP, as long as the residual activity within the survey unit is less than the DCGL (i.e. the survey unit average activity is less than the DCGL and the EMC criterion has been met), the ALARA criterion has been met.
Changes in Initial Survey Unit Assumptions:
The survey unit was designed as a Class 1 structure survey and the sample results are consistent with that classification. The variability of the survey results was less than the characterization data used for survey design. No potential areas of elevated activity were detected. Therefore the EMC criterion was met.
==
Conclusion:==
The FSS of this survey unit was properly designed as a Class I survey based on Table 5-4 of the LTP. The required number of direct measurements was made and the scan coverage met the requirement of Table 5-6 of the LTP. No direct measurements exceeded the DCGL of 43,000 dpm/100 cm 2 and none of the removable surface activity measurements exceeded 10% of the DCGL. No investigations were required.
The direct measurement data support rejection of the null hypothesis, providing high confidence that the survey unit satisfied the release criteria and that the data quality objectives were met.
It is concluded that survey unit F81 10111 meets the release criteria of 10CFR20.1402.
Page 12 of 12 FSS Summary Report F81 10111
Attachment 1 Maps October 9, 2008 Survey Unit F8110111
0 --
L. 'Li 1r /<
- ...... J"I I ' -. m- ".. Location of ...Cntainment.Buiioldn '""
1cc3
..... , F--
--i.... . .-
IN: ]0;... .
.. = == - = : -=-\ ::- - _ .
000 i :I Location of Containment Building
.. /.. . i . L "i n s ide t h e In d u s t r ia l A r e a N
Map F8110111-1, Containment Building Location at Rancho Seco site
'-e 0 Distance Survey Unit F8110111 Distance in feet above -27 El. above 0" El.
0 Z w V)
V 42 ft. - 43.28 m 115 ft.
32 ft, - 40.23 mi-22 ft. - 37.19 mw
,12 t. - 34.14 m 95aft.
02 ft. - 31.09 mr 55 ft.
45 ft.
+/-- 351f1.
-- 4*.
255 ft.
15 ft.
(+) 0' El. . 5 ft.
- 15 It.
! -25 ft.
(-) 27' El.
3.46 meters between horizontal centers 3.05 meters between vertical rows NOTE: Polar Crane supports are located every 10 degrees, are numbered in red and will be used to index gamma measurements.
Total Scan Area is approximately 1,966 square meters (100%). Map F8110111-2, Reactor Containment Interior Walls 00 ISOCS Gamma Scan Measurements F8110111M0001GS to F8110111M0180GS 0 2 0 n
- 6. 19.6 sq. meter field of view Di'anr mMe-,,
0 Survey Unit F8110111 Distance in feet above 0 El.
C\
40 a 0 w Q)
- 115ff.
- 105 f5 95 ft.
9 F 85 ft 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 1 2 3 4 5 6 7 8 9 T 75 ft.
65 ff
\ Personnel 55 ft.
ID numbers of polar ID numbers of polar
- 45ftf crane supports ........ crane supports
- 35 ft.
Equipment *° ... $... ° . *..
S15ff.
Hatch 0_ Transfer Tubes o
o.
0 G
Emergency Hatch
- 01) 5 ft.
(+) 0 El. .. . . . . .. . . . . . ....... ... 90.
-5 ft.
e.
.. . . .. . ...... . ......... -*-.coce - 15 ft.
-- 25 ft.
(-) 27 El.
NOTE: Polar Crane supports are located every 10 degrees and are numbefed in red.
Map F8110111-3, Reactor Containment Interior Walls 00 Crane Rail Supports 02 r 58 ffslancoLuLlevrs
('D Survey Unit F8110111 Distance in feet above 0 El.
0 w 0 z
V 115 ft.
19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 1 3 5 7 9 11 13 15 17 105 ft.
I
- I . . . .. . 4.. 95 ft.
-3 1 V V 20 52 d 68 . ..
85 ft.
CI)
, .. . . . . . / . - 75ft.
GL 5 ft.
\ I . Personnel Hatch ÷ 55ft.
ID numbers of polar I ID numbers of polar 7 45 ft.
crane supports'-* . .crane supports 7 35 ..
Equipment
- 25 ft.
Hatch Transfer Emergency 15ft.
Tubes Hatch aft.
5-(-)0' El.
-511
............. ,............eo..
15 f1.
-25 ft.
(-) 27' El.
NOTE: Polar Crane supports are located every 10 degrees, are numbered in rod.
It Map F8110111-4, Reactor Containment Interior Walls 00 Smear Measurements 9 2 4 6 8 Diýe in Pk:- F8110111M0001SM to F8110111M0072SM
fi -,
Map F8110111-5, Reactor Containment Interior Walls Crane Rail Support - Total of 36 Supports 0.0 0.1 0.2 Distance in Meters Page 6 of 6 Att. 1 Maps F81 10111
Attachment 2 Instrumentation October 9, 2008 Survey Unit F8110111
Table 2-1. Survey Unit Instrumentation Instrument Detector MDC Static MDC Scan Model; Serial No. Model; Serial No. (dpm/100 cm ) 2 (dpm/100 cm 2 )
M2350; 142509 44-116; 193992 343 884 M2350; 142507 44-116; 153352 343 884 M2350; 189089 44-116; 192946 343 884 M2350; 149794 44-116; 193562 343 -884 M2350; 142509 43-51B; 190667 788 2,675 M235'0; 180738 43-51B; 190666 788 2,675 Tennelec; 0401171 N/A 4.93 dpm (x, N/A 8.21 dpmrn3 MDC Metal - 1,140 dpm/100 cm 2 Cs-137, Metal - 652 dpm/100 cm 2 Co-60 Table 2-2. Investigation Criteria and DCGL Value Parameter (dpm/1OO cm 2 )
Investigation Criteria - Direct 640,700 Investigation Criteria- Scan 34,000 Cs-137 (ISOCS average activity - 19.6 11,000 Co-60 sq. meter field of view)
DCGLw 43,000 DCGLEMC 640,700 Page 2 of 2 Att. 2 Instrumentation F81 10111
Attachment 3 Investigation October 9, 2008 Survey Unit F8110111 (none required)
Attachment 4 Data Assessment October 9, 2008 Survey Unit F8110111
(D F81 10111 Gross Activity Sample Results Quantile Plot DCGL =43000 dpmll 00cm2 1 8,000 - l ~t2 17,000 4- '~;g'Q~
16,000 .
15,000 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
1 4,000 2~4 4 ~" <4? lt<,1U~~'~
-13,000 ~ "
11,000 4~
4 t4 r- "~
19,000 . 4 ' "r 7,000 -'44
- - -- ' 6n.
,000 ."'A4'A"~4 W' CD -
5,000 c 1tt '4, 1 2,000"" 1830 1,000 I T"44A1<4& 44 it o 20 40 60 80 100
~ITJ Percentile
- Dirct Measurements (dpm/lQ0cm2) -median - -- 75th Percentile 50th Percentile
-o 4:Q P8110111 Gross Activity Sample Results Scatter Plot DCGL = 43000 dpm1OOcm 2 201000 1 19,000-18,000.-.
11,000 0 16,000 E 0 0
A 0 14,000 -
0 E
13,000H 0 Ct 0O 12,000 11,000 "1- - - a - - - - --- - - a - - - a---------------------- 1 12028 a: 0 Un 0
>a 10,000- 0 0
-4 92000 0 a 84000- 0 0 0 0-14000- 0 01000 0 o 0o00 0
)
51000 0 0 0 c0 4,000o 0 f- 00 0 Z 0 0
[11 3,000- O*
c o " ,OO r00 q
- 0 0(P 0)%0 2992 G'
0,-
0 z a-, -N 00 21000 Coo &2 0 o%' ot C? tcttt ,. c ) ~0 a/ 1,000 Measurement Locations o) Gross Activity - Average -...j+3StDev "- "-3StDevI
CDQ F81 10111 Gross Activity Frequency Plot DCGL = 43000 dpm/1 00cm 2 115 110 105 100 95 an b 90
- 0) 85 80, 75 70 65 60 3D 55 0
50 45 W
40 En 35 30 25 20 15 10 CD'- 5 0
(NJ 0)CO UL) N'--
Bins - Upper End Value (dprn/1 00cm2)