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 cm 2. 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 Survey Unit:
Class:
SU Area (m2):
Evaluator:
DCGL (dpm/100 cm2):
Area Factor:
Design DCGLemc (dpm/100 cm2):
LBGR (dpm/100 cm2):
Design Sigma (dpm/100 cm2):
Type I Error:
Type II Error:
Predominant Nuclide:
Sample Area (m2):
Scan Area (M2):
Scan Coverage (%):
Zl_*t :
Zj-P :
Sign P:
Calculated Relative Shift:
Relative Shift Used:
N-Value:
Design N-Value + 20%:
Design Min Samples N:
Grid Spacin2 L:
0111 1
1,966 D. Anderson 43,000 14.9 640,700 21,500 33,040 0.05 0.05 Cs-137 19.6 1,966 100%
1.645 1.645 0.725747 0.6 0.6 54 65 180 N/A Reactor Building, Interior Walls, (+) 75' El. to
(+) 115' El.
Structure Surface LTP Table 5-4 Gross Activity DCGL Class 1 (for I m2)
Based-on 1 m2 at the edge of the 19.6 m2 field of view Default = 50% DCGL DTBD-06-001, Table 5-4D Class 1 Class 1 Uses 3.0 if Relative Shift is
>3 NUREG-1575 Table 5-5 Class 1 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 cm2)
F8110111-MO140GS F8110111-M0141GS F8110111-MO142GS F8110111-MO143GS F8110111-MO144GS F8110111-MO145GS F8110111-MO146GS F8110111-MO147GS F8110111-M0148GS F8110111-MO149GS F8110111-MO150GS F8110111-MO151GS F8110111-M0152GS F8110111-MO153GS F8110111-MO154GS F8110111-MO155GS F8110111-MO156GS F8110111-MO157GS F8110111-MO158GS F8110111-MOI59GS F8110111-MO160GS F8110111-MO161GS F8110111-MO162GS F8110111-MO163GS F8110111-MO164GS F8110111-MO165GS F8110111-MO166GS F8110111-MO167GS F8110111-MO168GS F8110111-MO169GS F8110111-MO170GS F8110111-MO171GS F8110111-MO172GS F8110111-MO173GS F8110111-MO174GS F8110111-M0175GS F8110111-MO176GS F8110111-MO177GS F8110111-MO178GS F8110111-MO179GS F8110111-MO180GS Mean:
Median:
Standard Deviation:
Ranqe:
1,145 720 1,553 2,994 1,438 2,502 1,516 702 2,773 857 687 794 910 2,240 860 994 1,418 1,251 2,068 1,076 608 838 1,004 3,198 1,324 988 754 915 2,234 826 826 838 1,163 2,337 857 1,312 3,031 3,061 4,705 2,667 1,153 2,992 1,830 3,012 541 to 17.259 406 331 456 666 450 587 446 335 618 536 368 390 441 422 511 380 306 387 686 410 392 317 360 578 393 571 414 654 664 875 614 395 Page 7 of 12 FSS Summary Report F81 10111
Table 3. Removable Surface Activity Results Measurement ID Surface Beta Activity (dpm/100 cm2)
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 F8110111-MOO50SM F8110111-MOO51SM F8110111-MOO52SM F8110111-MOO53SM F8110111-MOO54SM F8110111-MOO55SM F8110111-M0056SM F8110111-MOO57SM F8110111-MOO58SM F8110111-MOO59SM F8110111-MOO60SM F8110111-MOO61SM F8110111-MOO62SM F8110111-MOO63SM F8110111-MOO64SM F8110111-MOO65SM F8110111-M0066SM F8110111-MOO67SM F8110111-M0068SM F8110111-MOO69SM F8110111-MOO70SM F8110111-MOO71SM F8110111-M0072SM Mean:
Median:
Standard Deviation:
Range:
165.01 21.66 95.27 229.58 427.18 13.91 265.75 44.91 74.61 48.78 26.83 68.15 15.20 16.50 15.20 60.41 16.50
.84.94 12.62 39.74 21.66 46.20 46.20 136.60 96.64 46.2 129.12 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 cm2):
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 cm2):
2,992 Direct Measurement Standard Deviation 3,012 (dpm/100 cm 2):
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 Maps October 9, 2008 Survey Unit F8110111
0 L.
'Li 1 r
/<
J"I I m
Location of Cntainment.Buiioldn 1cc3 F--
000
--i IN: ]0;...
.-.. === - = : -= -\\ ::- - _
i
- I Location of Containment Building L
/
i "i
n s id e t h e I n d u s t r i a l A r e a N
Map F8110111-1, Containment Building Location at Rancho Seco site
'-e 0
00 Distance above -27 El.
Survey Unit F8110111 Distance in feet above 0" El.
w 0V)
V 42 ft. - 43.28 m 32 ft, - 40.23 mi-22 ft. - 37.19 mw
,12 t. - 34.14 m 02 ft. - 31.09 mr
(+) 0' El.
(-) 27' El.
Z 115 ft.
95 aft.
55 ft.
45 ft.
+/-- 351f1.
--25 ft.
15 ft.
4*. 5 ft.
. 5 ft.
- 15 It.
! -25 ft.
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%).
0 2
0
- 6. n Di'anr m Me-,,
Map F8110111-2, Reactor Containment Interior Walls ISOCS Gamma Scan Measurements F8110111M0001GS to F8110111M0180GS 19.6 sq. meter field of view
0 C\\
Survey Unit F8110111 Distance in feet above 0 El.
aw 0
Q) 4 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
\\
Personnel ID numbers of polar ID numbers of polar crane supports crane supports 0
- 115ff.
- 105 f5 9 95 ft.
F 85 ft T 75 ft.
65 ff 55 ft.
- 45ftf 35 ft.
S15ff.
5 ft.
-5 ft.
- 15 ft.
-- 25 ft.
Equipment Hatch 0_
- °
° 90.
- e.
-*-.coce Transfer o
0 Tubes
- o.
G Emergency Hatch 1
0 )
(+) 0 El.
(-) 27 El.
NOTE: Polar Crane supports are located every 10 degrees and are numbefed in red.
00 Map F8110111-3, Reactor Containment Interior Walls Crane Rail Supports 02 r 58 ffslanco Lu Llevrs
('D CI)
Survey Unit F8110111 Distance in feet above 0 El.
w 0
0z V
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 I
- I 4..
-3 1 V V 20 52 d
68
/
\\
I Personnel Hatch ID numbers of polar I
ID numbers of polar crane supports'-*
.crane supports 115 ft.
105 ft.
95 ft.
85 ft.
75ft.
GL 5 ft.
÷ 55ft.
7 45 ft.
7 35..
25 ft.
15ft.
5-aft.
-511 15 f1.
-25 ft.
Equipment Hatch
,............eo..
Transfer Tubes Emergency Hatch
(-)
0' El.
(-) 27' El.
NOTE: Polar Crane supports are located every 10 degrees, are numbered in rod.
It 00 9 2 4
6 8
Diýe in Pk:-
Map F8110111-4, Reactor Containment Interior Walls Smear Measurements 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 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 cm2 )
(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 cm2 Cs-137, Metal - 652 dpm/100 cm 2 Co-60 Table 2-2. Investigation Criteria and DCGL Value Parameter (dpm/1OO cm2)
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 Investigation October 9, 2008 Survey Unit F8110111 (none required)
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 A
Ct a:
Un a
[11 00 a/
E E
0 0O
>a
-4 201000 1 19,000-18,000.-.
11,000 16,000 14,000 -
13,000H 12,000 11,000 10,000-92000 84000-14000-01000 51000 4,000o 3,000-21000 0
0 0
0 0
"1- -
- a a -
a----------------------
1 12028 0
0 0
0 0
0 0-0 0
0 0
)
0 0
o 0o00 0
0 0
0 c0 f-00 0
0 Z
O*
0 z
- 0 0,-
0(P 0)%0 o c
,OO r00 q
o %'
C?
ot tcttt G'
c 0
Coo
&2 a-,
-N
)
~0 2992 1,000 Measurement Locations o )
Gross Activity -
Average -...j+3StDev
"- "-3StDevI
CDQ an 0) 3D W
En CD'-
F81 10111 Gross Activity Frequency Plot DCGL = 43000 dpm/1 00cm2 b
0 115 110 105 100 95 90 85 80, 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5
0 (NJ 0)CO UL)
N'--
Bins - Upper End Value (dprn/1 00cm2)