ML090850558
| ML090850558 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 10/07/2008 |
| From: | Donna Anderson Sacramento Municipal Utility District (SMUD) |
| To: | NRC/FSME |
| Shared Package | |
| ML090830613 | List:
|
| References | |
| DPG 09-097 | |
| Download: ML090850558 (35) | |
Text
1J Rancho Seco Final Status Survey Summary Report October 7, 2008 Turbine Building High Pressure Pedestals, (+) 0' El. to (+) 20' El.Survey Unit F8261004 Prepared By: .
-FSS Engineer Date:. I/07/ 20" Reviewed By: .Date: (0 fi?Lead FSS Engineer Approved By: ?Date: __-_7_Dismantlement Superintendent, Radiological FINAL STATUS SURVEY
SUMMARY
REPORT Survey Unit:F8261004, Turbine Building High Pressure Pedestals, (+) 0' El. to (+) 20' El.Survey Unit
Description:
Operating History: The reinforced concrete and steel structure contained the turbine-generator and supporting systems. The building contained five 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.
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 measurements in the condenser pit elevation showed a mean gross activity level of 3,077 dpm/l100 cm 2 and a maximum value of 24,900 dpm/l 00 cm 2.Direct measurements on the grade elevation showed a mean gross activity level of 2,035 dpm!100 cm 2 and a maximum value of 6,980 dpm/100 cm 2.Direct measurements on the mezzanine elevation showed a mean gross activity level of 1,566 dpm/100 cm 2 and a maximum value of 2,626 dpm/100 cm 2.Direct measurements on the +40' elevation showed a mean gross activity level of 2,843 dpm/100 cm 2 and a maximum value of 3,615 dpm/ 100 cm 2.Direct measurements on the building exterior showed a mean gross activity level of 1,984 dpm/100 cm 2 and a maximum value of 10,312 dpm/100 cm 2.Based on the classification procedure (DSIP-0020) and levels of gross activity reported, the interior of the turbine building was determined to be Class 1, 2, & 3 areas 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 random-start, fixed grid pattern and 262.2 m 2 were scanned for 100% coverage.
Samples of removable contamination were collected at each direct measurement location.
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 9 FSS Summary Report F8261004 Table 1. Survey Unit Design Parameters Survey Design Value Comment Parameter Survey Area: F826Survey Unit:
Class: SU Area (m2): Evaluator:
DCGL (dpm/100 cm 2): Area Factor: Design DCGLemc (dpm/100 cm 2): LBGR (dpm/100 cm 2): Design Sigma (dpm/100 cm 2): Type I Error: Type II Error: Predominant Nuclide: Sample Area (m2): Scan Area (m 2): Scan Coverage (%): Zl-a : Sign P: Calculated Relative Shift: Relative Shift Used: N-Yalue: Design N-Value + 20%: Design Min Samples N: Grid Spacing L: 1004 1 262.2 D. Anderson 43,000 3.8 163,400 25,030 5,990 0.05 0.05 Cs-137 6.9 262.2 100%1.645 1.645 0.99865 3 3 11 14 38 2.6Turbine Building High Pressure Pedestals, (+) 0'El. to (+) 20' El.Structure SurfaceLTP Table 5-4 Gross Activity DCGL Class 1 Class 1 Adjusted Class 1 Class 1 Uses 3.0 if Relative Shift is>3 NUREG-1575 Table 5-5 Class 1 Class 1 Page 3 of 9 FSS Summary Report F8261004 Survey Results: A total of 43 direct measurements were made in F8261004.
The results including mean, median, standard deviation and range are shown in Table 2. All direct measurementswere less than the DCGL. One scan measurement indicated an area of elevated activity
(> DCGLEMC).
Due to scan measurements that were greater than the DCGL, a total of nine scan grids were investigated.
Beta scan activity ranged from 3,045 to 187,872 dpm/100 cm 2 , 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.Page 4 of 9 FSS Summary Report F8261004 Table 2. Direct Measurement Results Measurement ID Gross Activity (dpm/100 cm)i F8261004-CO001 BD F8261004-XO002BD F8261004-XO003BD F8261004-XO004BD F8261004-XO005BD F8261004-CO006BD F8261004-CO007BD F8261004-CO008BD F8261004-C0009BD F8261004-XOOIOBD F8261004-C0011BD F8261004-CO012BD F8261004-CO013BD F8261004-Co014BD
F8261004-Co015BD F8261004-CO016BD F8261004-XO017BD F8261004-XO018BD F8261004-XO019BD F8261004-CO02OBD F8261004-C0021 BD F8261004-XO022BD F8261004-CO023BD F8261004-CO024BD F8261004-XO025BD F8261004-CO026BD F8261004-CO027BD F8261004-CO028BD F8261004-CO029BD F8261004-XO030BD F8261004-X0031BD F8261004-XO032BD F8261004-CO033BD F8261004-CO034BD F8261004-CO035BD F8261004-XO036BD F8261004-CO037BD F8261004-XO038BD F8261004-XO039BD F8261004-XO040BD F8261004-X0041 BD F8261004-Co042BD F8261004-CO043BD Mean: Median: Standard Deviation:
Ranqe: 1,758 4,023 5,015 2,877 3,737 2,028 1,976 1,857 2,148 3,153 1,841 1,727 2,028 2,179 1,738 1,961 5,589 3,428 4,641 1,862 1,899 3,494 1,847 1,681 3,351 1,670 1,686 6,375 1,779 2,028 2,260 5,104 6,126 1,707 2,033 3,395 2,044 3,351 3,461 4,090 3,792 1,774 1,644 2,841 2,044 1,329 1,644 -6,375 Page 5 of 9 FSS Summary Report F8261004 Table 3. Removable Surface Activity Results Measurement ID Surface Beta Activity (dpm/100 cm 2)F8261004C0001 SM F8261004X0002SM F8261004X0003SM F8261004X0004SM F8261004X0005SM F8261004CO006SM F8261004C0007SM F8261004CO008SM F8261004C0009SM F8261004X0010SM F8261004C001 1 SM F8261004C0012SM F8261004C0013SM F8261004C0014SM F8261004C0015SM F8261004C0016SM F8261004X0017SM F8261004X0018SM
F8261004X0019SM F8261004C0020SM F8261004C0021SM F8261004X0022SM F8261004C0023SM F8261004C0024SM F8261004X0025SM F8261004C0026SM F8261004C0027SM F8261004C0028SM F8261004C0029SM F8261004X0030SM
F8261004X0031SM F8261004X0032SM F8261004C0033SM F8261004C0034SM F8261004C0035SM F8261004X0036SM F8261004C0037SM F8261004X0038SM F8261004X0039SM F8261004XO040SM F8261004X0041SM F8261004C0042SM
F8261004C0043SM Mean: Median: Standard Deviation:
Ranqe:-0.95 4.22-0.95 0.34-3.53-3.53 0.34-0.95-4.82-0.95 5.51-4.82-3.53-3.53 0.34 0.34 0.34-2.24-3.53 2.93-2.24-4.82-3.53
-3.53-0.95
-0.95 2.93 30.05-2.24-3.53-2.24 5.51 23.59-3.53
-3.53-3.53-2.24-4.82-4.82-4.82-0.95-2.24 0.34-0..26-2.24 6.67-4.82 to 30.05 Page 6 of 9 FSS Summary Report F8261004 Survey Unit Data Assessment:
The survey design required 43 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 designstandard deviation so no additional samples were required.ra Page 7 of 9 FSS Summary Report F8261004 Table 4. Data Assessment Results Survey Results Parameter Value CommentMaterial Background Used (dpm/100 cm 2): N/A'Ambient Background Used (dpm/100 cm 2): N/A Average Ambient BKG = 0 Actual Direct Measurements (N): 43 Median (dpm/100 cm 2): 2,044 Mean (dpm/IO0 cm 2): 2,841 Direct Measurement Standard Deviation 1,329 (dpm/100 cm 2): Total Standard Deviation (dpm/100 cm 2): 1,329 Based on samples and backgrounds.
Maximum (dpm/100 cm 2): 6,375 Material Type: N/A Background Subtract Not Applied Sign Test Final N Value: 43 S+ Value: 43 Critical Value: 27 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? YesReject the Null Hypothesis?
Yes Does the Survey Unit Pass All Criteria?
Yes Page 8 of 9 FSS Summary Report F8261004 Survey Unit Investigations and Results: Nine investigations (scan grids 4, 5, 11, 17, 112, 118, 252, 268 and 269) were requiredfor the scan measurements and the results are reported in Attachment
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. Nine potential areas of elevated activity were detected and evaluated as shown in Attachment
- 3. Therefore the EMC criterion was met.Conclusion:
The FSS of this survey unit was properly designed as a Class 1 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. Nine 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 F8261004 meets the release criteria of 1OCFR20.1402.
Page 9 of 9 FSS Summary Report F8261004 Attachment 1 Maps October 7, 2008 Survey Unit F8261004 0, -- -0 ....L),/ L -Li LJjj -:rjz"Ii<-- --'"-L u ,-o--.- .... .L'D az a-F"-Z o Location of Turbine Building inside the Industrial Area 00 S Map F826100471, Location of Turbine Building at Rancho Seco site CD 0 00 I in, Q" I 2>1,R" 1019W ln'q,, I 21' A" 10' rn I' -co 0.4 22" b N (N North Column Looking North 932 ft2 -86.6 m'2 01 (N~North Column Looking North ,T-00 oo 0o North Column Develope Looking South Reflected V Developed Reflected View id 277 ft 2 -25.7 m 2'iew Map F8261004-2, Turbine Building (+) 0' El. to (+) 40' El.High Pressure Turbine Pedestals
-North Column Area Estimate:
2,266 sq ft. -210.5 sq. meters F8261003 Area Estimate:
112.3 sq. meters F8261004 Area Estimate:
40.0 sq. meters F8261005 Area Estimate:
98.2 sq. meters O1 F8261003, Class 1 0] F8261004, Class 1 9 F8261005, Class 2 0.0 1.0 2.0 3.0 4-0 Distance n Metms Cb 0 00 00 Developed Refelected View 0l F8261003, Class 1 0 F8261004, Class 1[a F8261005, Class 2 I I 1Ii 0.0 1,0 2.0 3.0 4.0 Distance in MWtors Developed Reflected View 115 ft 2 -10.7 m 2 Map F8261004-3, Turbine Building (+) 0' El. to (+) 40' El.High Pressure Turbine Pedestals
-South Column Area Estimate:
1,151 sq ft. -106.9 sq. meters F8261003 Area Estimate:
67 sq. meters F8261004 Area Estimate:
40 sq. meters L ~30' 9"J 46-1-1' "-1r'7 0 00 I-6 z Nb West Column West Column Developed Looking West Looking East Reflected View 17'4" It1 00 1] F8261003, Class 1[] F8261004, Class 1 t] F8261005, Class 2 Developed Reflected View 134.3 ft' -12.5 m 2 Map F8261004-4, Turbine Building (+) 0' El. to (+) 40' El.High Pressure Turbine Pedestals
-West Column Area Estimate:
1,428.3 sq ft. -132.7 sq. meters F8261003 Area Estimate:
40.0 sq. meters F8261004 Area Estimate: 26.0 sq. meters F8261005 Area Estimate:
66.7 sq. meters 0.0 1.0 20 3.0 4.0 Distance in Melers p 30'9" C0 000 U z 0 C'4 I- 6' 1,. 14'2" .1 3'6"- 1-4, ri 6~lw 174/ I!Developed Reflected View 134.3 ft 2-12.5 m'I'll 00 oo 0o 4:2 East Column Looking East fl F8261003, Class 1 0 F8261004, Class 1 M F8261005, Class 2 East Column Looking West 0.0 1.0 2.0 3.0 Distance in Meters Developed Reflected View Map F8261004-5, Turbine Building (+) 0' El. to (+) 40' El.High Pressure Turbine Pedestals
-East Column Area Estimate:
1,428.3 sq ft. -132.7 sq. meters F8261003 Area Estimate:
40.0 sq. meters 40 F8261004 Area Estimate:
26.0 sq. meters F8261005 Area Estimate:
66.7 sq. meters CfQ--I 0 00 A N I 03 (0 (N 09 0 01 21'8" 05 4', IA Q COO LI V~1 K HP Turbine Pedestal fRi 7 ' 8,6 W E HP Turbine Pedestal Plan View -40' El.i 1k 03 19' 2" 05 Ii-I I 2R,' A" 02 11 10"-I S1, 10"'71 00 0 26'4" , 21'8" 114- 48'O1 F8261003, Class 1 O1 F8261004, Class 1 IM F8261005, Class 2 0.0 1.0 2.0 3.0 4.0 Distance in Meters Map F8261004-6, Turbine Building (+) O' El.High Pressure Turbine Pedestals
-Floor Surface Area with Trench Vertical Surfaces Area Estimate:
1,402 sq ft. -130.2 sq. meters
-]- -...]-i- -*1- --I- -r- -- ---00 0 00---7-'-'ii -A iT1F -11] -r -, rI...--- L-j -.-4------+--
F I I-*1~-1 II 2-F-li-4I~1 I "-4 I-I I--~ I I*~ ~4't-"---I.-F-I-I- *-~-I *~~-F-r---4 7 04tl 1 [ 1 ! I I 1 Ti 1717 1771 ITYii i1i i it i ,-" , , i i !-i-- F ---t t --1 ---I ---- -i i. i- ' H t t-LI 11+_estGColumi4 -i (-ill--I--I-nu aIh flenIm Fr
--3 rt-.,o~ati n e -3 mn frqmn N ort6 edgqe I E---ast Colymr zIzt~11z}~zi3i]EiEf I T ii7f 7~.ii i 1--I..I.ooking SLo th net 11)rs from West! ed,le -1[VIZ, [II r*--t]-=4_" _ _7-I---.ii 7- I _______ivv11-vi-vr
.7' ---iIH'~'~' LA r~~H rrr~~1~~ I-i-I F, IT III _______~1~ ..}F I I IL 1- --I- 7- -..7 7-LE I L-,-J L P-2an-V;6w-Ptl-
-] I;-~-J1F I.1-Ii- h-Xerti(H.,2b.]L_,--VJ aceuur 00 C)--I.------1 North Column:ooki56- Nrt--I---i-f -.{ --f -] -117-F 1 ' I i-i-< --i ---V -S i ! i ,I i-i , ; t FF F F-, i-ii-- 7-1~- I --- I ~ I-i--1-2-F II, 0 5 0 1 2 3 4 Distance in Meters 10 15 20 25 30 35 40 45 50 Map F82601004-7, High Pressure Turbine Pedestals Random Start Location E -t oo L- ) fl/l 0 , 00 0.5 m a frm 11 8.0 m 13 Dis ..ce from E West edge -- to of survey unit 0 00 C N 0 0.5 1.0 1.5 2.0 Distance in Meters E E E E E 0 U) 0 0 0U)Map F8261004-8, Turbine Building (+) O' El.High Pressure Turbine Pedestals
-Floor Surface Area Beta Direct Measurements F8261004C000 1 BD, F8261004X0002BD to F8261004XO005BD F8261004CO006BD to F8261004CO009BD, F8261004XO010BD, F8261004C0011BD to F8261004CO016BD, F8261004X0017BD to F8261004X0019BD (2.5 meter grid spacing) 0(0 O0 v -m0.58 m 0.08 m from edge 0.50 m from edge from edge from edge Iz1 00 Map F8261004-9, Turbine Building (+) 0' El. to (+) 40' El.High Pressure Turbine Pedestals
-East and South Columns Beta Direct Measurements F8261004X0025BD, F8261004C0026BD to F8261004C0027BD, F8261004X0032BD, F8261004C0033BD to F8261004C0035BD, F8261004X0036BD, F8261004C0037BD, F8261004X0038BD, F8261004C0042BD to F8261004C0043BD 2.5 meter grid spacing 0 0.5 1.0 1.5 2.0 Distance in Meters 05 00 00 1.04 m from edge 7 0.58 m from edge 0 0.5 1.0 1.5 2.0 Distance in Meters 0.50 m from edge Looking North V 0.72 m from edge Map F8261004-10, Turbine Building (+) 0' El. to (+)40' El.High Pressure Turbine Pedestals
-West and North Columns Beta Direct Measurements F8261004C0020BD to F8261004C0021 BD, F8261004X0022BD F8261004C0023BD to F8261004C0024BD, F8261004C0028BD to F8261004C0029BD,* F8261004X0030BD to F8261004X0031BD, and F8261004X0039BD to F8261004X0041 BD 2.5 meter grid spacing 0)00~ 4 I East Column Looking East South Column Looking South 1m C9 0-T CI) r-. C C C) 0 0 1im 1im z r: C:WO 1- CI)C0 0 0 COW )(P a4 (P I side$tart Grid wraps to left side of West Column (Map F8261004-12)
C-Il 00_ -Concrete painted with 1 layer of paint Map F8261004-11; Turbine Building (+) 0' El. to (+) 40' El.High Pressure Turbine Pedestals
-East and South Columns Beta Scan Measurements F8261004C0001BS to F8261004C0036BS, F8261004C0043BS to F8261004C0072BS, and F8261004C0103BS to F8261004C01 14BS I Ditace inMetr 0t 00U) U)11 C)T.U) I U) U)
C.0 co coCl> CT)tn LnU) U)In Co M 04 00LO LO V) (n U)39BS CO CO CO to ý; t'.UýS :M 7 B-M, LO 7 E \E West Column Looking West North Column Looking North ilm C-0 lm 1m Im co Grids wrap to right s!de of South Column (Map F8261004-11)
Grids wrap to left side of West Column Grid wraps from left sid of East Column (Map F8261004-11)
ItJ 00I M -Concrete painted with 1 layer of paint Map F8261004-12, Turbine Building (+) 0' El. to (+) 40' El.High Pressure Turbine Pedestals
-West and North Columns Beta Scan Measurements F8261004C0037BS to F8261004CO06OBS, F8261004C0073BS to F8261004C0102BS, and F8261004C0109BS to F8261004C0132BS 0 0.5 1-0 1.5 2.0 Distance in Meters 00 U')(0244BS243BS 242BS 241 BS 240BS 239BS 212BS 211BS 210BS 209BS208BS207BS 185BS 186BS 187BS 188BS 189BS 190BS 191B5 192BS 193BS 194BS 195BS 182BS 181BS 18085 179BS 17885 17785 17685 175BS 174BS 17385 17285 J~In///158BS 159BS 160BS'71 00 C)C)I M -Concrete painted with 1 layer of paint N Map F8261004-13, Turbine Building (+) 0' El.High Pressure Turbine Pedestals
-Floor Surface Area Beta Scan Measurements F8261004C0133BS to F8261004C0213BS, F8261004C0221BS to F8261004C0228BS, F8261004C0230BS to F8261004C0237BS, F8261004C0239BS to F8261004C0245BS, F8261004C0255BS to F8261004C0256BS, and F8261004C0259BS to F8261004C0285BS 0 0.5 1.0 1.5 2.0 Distance in Meters (D 0 00 00 C)ik I M -Concrete painted with 1 layer of paint Map F8261004-14, Turbine Building (+) 0' El.High Pressure Turbine Pedestals
-Trench Walls Beta Scan Measurements F8261004C0214BS to F8261004C0237BS, F8261004C0246BS to F8261004C0254BS, and F8261004C0257BS to F8261004C0258BS 0 0.5 1.0 1.5 2.0 Distance in Meters (0 00 00 N 0 0.5 1.0 1.5 2.0 Distance in Meters Map F8261004-15, Turbine Building (+) 0' El.High Pressure Turbine Pedestals
-Floor Surface Area Juncture Scan Measurements F8261004C0001JS to F8261003C0018JS
+,,+ .-., I * .+,>4, , ** *+*_*+ CDb~~*-;I frq*0 East Column South Column Looking East -Looking South 00 Map F8261004-16, Turbine Building (+ ' El. to (+40 El.High Pressure Turbine Pedestals
-East and South Columns Juncture Scan Measurements 0 0.5 1.0 1.5 2.0 Ditac in Metem F8261004CO019JS to F8261004C0020JS.
Map F8261004-17, Turbine Building (+) 0' El.High Pressure Turbine Pedestals Beta Scan: Measurements of Railings F8261004M0286BS to F8261004M0289BS Page 18 of 18 Att. 1 Maps F8261004 Attachment 2 Instrumentation October 7, 2008 Survey Unit F8261004 Table 2-1. Survey Unit Instrumentation Instrument Detector MDC Static MDC Scan Model; Serial No. Model; Serial No. (dpm/l00 cm 2) (dpmll00 cm 2)M2350; 193700 43-68B; 190294' 433 1,033 M2350; 193700 43-68B; 1902942 909 2,169 M2350; 193700 43-68B; 1902943 257 612 M2350; 203486 43-68B; 161400' 433 1,033 M2350; 203486 43-68B; 1614002 909 2,169 M2350; 193715 43-68B; 160703' 433 1,033 M2350; 193715 43-68B; 1607032 909 2,169 M2350; 189089 43-68B; 148460' 433 1,033 M2350; 189089 43-68B; 1484602 909 2,169 M2350; 175834 43-116-1B; 1906423 472 1,930 M2350; 175834 43-116-1B; 1906424 491 739 Tennelec; 0401171 N/A 5.88 dpm a, N/A 11.71 dpmf3'Concrete surfaces 2 Concrete surfaces with I layer of paint 3 Metal surfaces 4 Concrete junctures Table 2-2. Investigation Criteria and DCGL Value Param eter V l eC 2 (dpm/100 cm 2)Investigation Criteria -Direct 163,400 Investigation Criteria -Scan 163,400 DCGLw 43,000 DCGLEMC 163,400 Page 2 of 2 Att. 2. Instrumentation F8261004 Attachment 3 Investigation October 7, 2008 Survey Unit F8261004 Table 3-1 Survey Unit Investigation Investigation Initial Value Investigation Elevated Area DCGLemc Investigation DCLemc Result Area () Result Unity Gd Level (cpm) (cpm) (cpm) (dpm/lOOcm
- 2) Fraction 4 22,200 15,982 12,986 0.026 499.6 21,483,230 67,362 0.003 5 22,200 25,610 34,328 0.062 211.3 9,085,040 178,068 0.020 11 22,200 8,795 6,415 0.068 192.8 8,290,830 33,276 0.000 17 22,200 2,441 8,583 0.077 170.5 7,330,640 44,522 0.006 112 22,200 3,075 2,562 0.052 251.5 10,813,640 13,290 0.000 118 22,200 3,355 3,107 0.052 251.5 10,813,640 16,117 0.000 252 22,200 5,352 6,580 0.065 201.6 8,669,660 34,132 0.000 268 10,500 4,372 4,273 0.124 106.7 4,586,810 47,101 0.010 269 10,500 4,864 4,013 0.333. 45.4 1,950,050 44,235 0.023 DCGL = SU Mean =Survey Unit Remainder 43,000 2,841 0.066 EMC Unity Sum 0.128 Page 2 of 2 Att. 3 Investigation F8261004 Attachment 4 Data Assessment October 7, 2008 Survey Unit F8261004 00 Cl), PýF8261004 Gross Activity Sample Results Quantile Plot DCGL = 43000 dpmll 00cm 2 II 7,000 6,000 5,000 4,000 3,000 2,000 1,000 0 2044 I0 2 0 20 40 60 Percentile 80 100* Direct Measurements (dpm/l100cm2) -median ---75th Percentile
.... 50th Percentilej CD 0 CD It 00 C)C)P0 o F8261004 Gross Activity Sample Results Scatter Plot DCGL = 43000 dpml00cm=1 IN E E*0 bed i 8000 7000 6000 5000 4000 3000 2000 1000 0-1000-2000 0 0 0 0 0 0 00 0 0 0 0 0 0 0 000 0 0 0) 000 0 O0 00 00 0°0 0 0 00(:-828 2841-1146 r r a00 0, 0Co 000,0-0 aW.wOwOrnWMOmfflOwOwOwmwOwwOw0w Measurement Locations I o Gross Activhty -Average --"+3SIDev" --"-3StDev "
0-4-00 CD'F8261004 Gross Activity Frequency Plot DCGL = 43000 dpm/l 00cm 2 LL C 0 4-J 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0, (N N-N-C?)N-c~J N-LO)Bins -Upper End Value (dpm/1 00cm2)