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{{#Wiki_filter:Rancho Seco Final Status Survey Summary Report July 17, 2008 Turbine Building (+) 0' El., North Floor Survey Unit F8260161 Prepared By: | {{#Wiki_filter:Rancho Seco Final Status Survey Summary Report July 17, 2008 Turbine Building (+) 0' El., North Floor Survey Unit F8260161 Prepared By: __ ._ _ __ _ _. _ __ _Date: 11/7/i0o " | ||
FSS Engineer Reviewed By Lead SSEgineDate:r Lead FSS Engineer Approved By: Date: | |||
Dismantlement S'4erintendent, Radiological | |||
FINAL STATUS SURVEY | |||
==SUMMARY== | ==SUMMARY== | ||
REPORT Survey Unit: F8260161, Turbine Building (+) 0' El. North Floor Survey Unit | REPORT Survey Unit: | ||
F8260161, Turbine Building (+) 0' El. North Floor Survey Unit | |||
== Description:== | == Description:== | ||
Operating History: The reinforced concrete and steel structure contained the turbine-generator and supporting systems. The building contained five main elevations. | 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. | ||
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. | Operating records and the HSA document several events with the potential for a release of radioactivity inside this structure. | ||
Site Characterization: | 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/1 00 cm 2 . Direct measurements on the grade elevation showed a mean gross activity leyel 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. | ||
Direct measurements were made of each of the interior elevation surfaces as well as the exterior surfaces of the structure. | During characterization surveys of F8260131 (Turbine Building (+) 0' El., North Floor, Class 2), beta measurements identified activity within a 2-meter by 3-meter area that exceeded the DCGL of 43,000 dpm/100 cm 2 . The area was subsequently remediated and reclassified as a Class 1 structure, based on the classification procedure (DSIP-0020). As a result of the reclassification, a new survey package was initiated as F8260161. | ||
These measurements confirmed the presence of plant-derived radionuclides. | HSA Events: HSA Report pg. 63. | ||
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/1 00 cm 2.Direct measurements on the grade elevation showed a mean gross activity leyel 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.During characterization surveys of F8260131 (Turbine Building (+) 0' El., North Floor, Class 2), beta measurements identified activity within a 2-meter by 3-meter area that exceeded the DCGL of 43,000 dpm/100 cm 2.The area was subsequently remediated and reclassified as a Class 1 structure, based on the classification procedure (DSIP-0020). | Survey Unit Design Information: | ||
As a result of the reclassification, a new survey package was initiated as F8260161.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 11.6 m2 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. | ||
The Survey Unit Design Parameters are presented in Table 1 below. The survey unit and measurement locations are depicted on the maps in Attachment | Page 2 of 8 FSS Summary Report F8260161 | ||
Samples of removable contamination were collected at each direct measurement location. | Table 1. Survey Unit Design Parameters Survey Design Value Comment Parameter Survey Area: F826 Turbine Building (+) 0' El. | ||
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 8 FSS Summary Report F8260161 Table 1. Survey Unit Design Parameters Survey Design Value Comment Parameter Survey Area: F826 Survey Unit: | North Floor Survey Unit: 0161 Structure Surface Class: 1 LTP Table 5-4 SU Area (m2 ): 11.6 Evaluator: D. Anderson DCGL (dpm/100 cm 2): 43,000 Gross Activity DCGL Area Factor: 17.7 Class 1 Design DCGLemc 761,100 Class 1 (dpm/100 cm 2): | ||
DCGL (dpm/100 cm 2): Area Factor: Design DCGLemc | LBGR (dpm/100 cm 2): 25,030 Adjusted 2 | ||
Design Sigma (dpm/100 cm ): 5,990 Type I Error: 0.05 Type II Error: 0.05 Predominant Nuclide: Cs-137 Sample Area (m2): 0.7 Class 1 Scan Area (M2): 11.6 Scan Coverage (%): 100% Class 1 ZlI, : | |||
1.645 ZI-0 : 1.645 Sign P: 0.99865 Calculated Relative Shift: 3 Relative Shift Used: 3 Uses 3.0 if Relative Shift is | |||
>3 N-Value: 11 Design N-Value + 20%: 14 NUREG-1575 Table 5-5 Design Min Samples N: 14 Class 1 Grid Spacing L: 0.9 Class 1 Page 3 of 8 FSS Summary Report F8260161 | |||
Range: 1, | |||
Survey Results: | |||
The survey design required 15 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 6 of 8 FSS Summary Report F8260161 Table 4. Data Assessment Results Survey Results Parameter Value Comment Material Background Used (dpm/100 cm'): N/A Ambient Background Used (dpm/100 | A total of 15 direct measurements were made in F8260161. The results including mean, median, standard deviation and range are shownin Table 2. All direct measurements were less than the DCGL. None of the scan measurements indicated areas of elevated activity. Scan activity ranged from 3,236 to 20,988 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. | ||
Maximum (dpm/100 cm | Table 2. Direct Measurement Results Measurement ID Gross Activit (dpm/100 cm F8260161-CO001BD 1,401 F8260161-CO002BD 2,692 F8260161-CO003BD 1,909 F8260161 -CO004BD 1,442 F8260161 -CO005BD 1,452 F8260161-CO006BD 1,395 F8260161-CO007BD 1,452 F8260161-C0008BD 7,672 F8260161-CO009BD 1,344 F8260161-Co01OBD 2,397 F8260161-Co01o1 BD 3,496 F8260161-Co012BD 2,277 F8260161-Co013BD 6,811 F8260161-CO014BD 1,499 F8260161-CO015BD 1,515 Mean: 2,584 Median: 1,515 Standard Deviation: 1,995 Range: 1,344 - 7,672 Page 4 of 8 FSS Summary Report F8260161 | ||
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? | Table 3. Removable Surface Activity Results Measurement ID Surface Beta Activity (dpm/100 cm 2 ) | ||
Yes Does the Survey Unit Pass All Criteria? | F8260161C0001SM -3.53 F8260161 C0002SM -4.82 F8260161 C0003SM -3.53 F8260161CO004SM 0.34 F8260161 C0005SM -2.24 F8260161 C0006SM -6.11 F8260161 C0007SM -0.95 F8260161 C0008SM -3.53 F8260161CO009SM -2.24 F8260161Co010SM -3.53 F8260161C0011SM -2.24 F8260161 C001 2SM -3.53 F8260161C0013SM -3.53 F8260161CO014SM -0.95 F8260161Co015SM 0.34 Mean: -2.67 Median: -3.53 Standard Deviation: 1.8 Range: -6.11 to 0.34 Page 5 of 8 FSS Summary Report F8260161 | ||
Yes Page 7 of 8 FSS Summary Report F8260161 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: | Survey Unit Data Assessment: | ||
The survey unit wasdesigned as a Class 1 structure survey and the sample results are consistent with that classification. | The survey design required 15 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. | ||
The variability of the survey results was less than the characterization data used for survey design. No potential areas of elevated activity were detected. | Page 6 of 8 FSS Summary Report F8260161 | ||
Therefore the EMC criterion was met. | |||
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. 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 F8260161 meets the release criteria of | Table 4. Data Assessment Results Survey Results Parameter Value Comment Material Background Used (dpm/100 cm'): N/A Ambient Background Used (dpm/100 cm2): N/A Average Ambient BKG = 0 Actual Direct Measurements (N): 15 Median (dpm/100 cm 2): 1,515 Mean (dpm/100 cm 2): 2,584 Direct Measurement Standard Deviation 1,995 2 | ||
Page 8 of 8 FSS Summary Report F8260161 Attachment 1 Maps July 17, 2008 Survey Unit F8260161 | (dpm/ 100 cm ): | ||
11.6 square meters 0 | Total Standard Deviation (dpm/100 cm 2 | ||
Attachment 4 Data Assessment July. 17, 2008 Survey Unit F8260161 F8260161 Gross Activity Sample Results Quantile Plot DCGL = 43000 dpm/1 | ): 1,995 Based on samples and backgrounds. | ||
* Direct Measurements (dpm/100cm2) | Maximum (dpm/100 2 cm ): 7,672 Material Type: N/A Background Subtract.Not Applied Sign Test Final N Value: 15 S+ Value: 15 Critical Value: 11 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 7 of 8 FSS Summary Report F8260161 | ||
-median -75th Percentile 50th Percentile ON _ | |||
(tQ | 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 wasdesigned 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 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. 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 F8260161 meets the release criteria of 10CFR20.1402. | |||
Page 8 of 8 FSS Summary Report F8260161 | |||
Attachment 1 Maps July 17, 2008 Survey Unit F8260161 | |||
. il I LII -5 0 | |||
DLIFII"F- J ii] | |||
a' 0 0 1 00D 00 00[ | |||
o] n n RD 00[ Rn II 0 | |||
N Location of Turbine Building inside the Industrial Area 0I1 00 ON N | |||
Map F82601.61-1, North Turbine Building (+) 0 Elevation Class 1 Area (floor) 0 2 4 6 Distance in Meters Area Estimate: 11.6 square meters | |||
CD 0 | |||
t) | |||
ON N Map F8260161-2, North Turbine Building (+) 0 Elevation 0 0.25 0.5 0.75 1.0 Class 1 Area Distance in Meters Random Start Location | |||
Distance in meters (D from East wall 0.6 m fjA 1.3 m 2.0 m EE E E E E | |||
() z 019 -~CO.o C: | |||
00 ONk ON Map F8260161-3, North Turbine Building (+) 0' Elevation N Class 1 Area Beta Direct Measurements 0 025 0.5 0.75 1.0 F8260161 C0001BD to F8260161 C0015BD Distance in Meters 0.7 m by 0.7 m cgrid spacing | |||
0 (II 00 Map F8260161-4, North Turbine Building (+) 0' Elevation Class 1 Area Beta Scan Measurements N F8260161C0001 BS to F8260161 C0006BS | |||
. Juncture Scan Measurements 0 | |||
I 0,25 0.5 0.75 1.0 F8260161C0001JS to F8260161C0004JS Distance in Meters | |||
Attachment 2 Instrumentation July 17, 2008 Survey Unit F8260161 | |||
Table 2-1. Survey Unit Instrumentation Instrument Detector MDC Static MDC Scan Model; Serial No. Model; Serial No. (dpm/100 cm2 ) (dpm/100 cm2) | |||
M2350; 193715 43-68B; 148630 433 1,033 M2350; 193715 43-116-IB; 190643 491 739 Tennelec; 0401171 N/A 5.88 dpm c N/A 11.71 dpm Table 2-2. Investigation Criteria and DCGL Parameter Value (dpm/100 cm 2) | |||
Investigation Criteria - Direct 761,100 Investigation Criteria - Scan 761,100 DCGLw 43,000 DCGLEMC 761,100 Page 2 of 2 Att. 2 Instrumentation F8260161 | |||
Attachment 3 Investigation July 17, 2008 Survey Unit F8260161 (none required) | |||
Attachment 4 Data Assessment July. 17, 2008 Survey Unit F8260161 | |||
F8260161 Gross Activity Sample Results Quantile Plot DCGL = 43000 dpm/1 00cm2 8,000 7,000 7,000+ | |||
7,00 5,000 | |||
, 4,000 CO) | |||
* ° r | |||
<3,000 - | |||
2,000 | |||
.*1515 0 - | |||
0 20 40 60 80 100 Percentile | |||
* Direct Measurements (dpm/100cm2) - median -75th Percentile 50th Percentile ON _ | |||
(tQ U) 0 o F8260161 Gross Activity Sample Results Scatter Plot DCGL = 43000 dpm100=cn 10000 o" 8000 o oo6000 4000 o 00 | |||
-2000 | |||
-20000000000 o 0 0 0 0 0 0 0 0) 0 0 0 0 0 oU 0 U 0 U 0 U 0 U 0 U 0U 0U 0U 0U 0U 0U 0U 0U 0U Measurement Locations Gross Actt Average "+3StDev" - "-3StDev | |||
. r | |||
: T TT: : :T ::::: T:T " : . : T: " T : :1: : : : ::T T: T T .: : ::Y T: . . .; " *1L : :: 1 ::::: I: i: 11i1T 1 1 | |||
- A: T | |||
CDQ 0 | |||
F8260161 Gross Activity Frequency Plot DCGL = 43000 dpm/1 00cm2 9 | |||
8 6" 7 6 | |||
U- 5 C | |||
0 4-Cl) 0 Cd) 3-0 2-1 0 | |||
(NJ N-(0 Ir1 | |||
('4 C%'I 00 CO Bins - Upper End Value (dpm/100cm2) | |||
ON}} |
Latest revision as of 08:43, 14 November 2019
ML090850550 | |
Person / Time | |
---|---|
Site: | Rancho Seco |
Issue date: | 07/17/2008 |
From: | Donna Anderson Sacramento Municipal Utility District (SMUD) |
To: | NRC/FSME |
Shared Package | |
ML090830613 | List:
|
References | |
DPG 09-097, F8260161 | |
Download: ML090850550 (20) | |
Text
Rancho Seco Final Status Survey Summary Report July 17, 2008 Turbine Building (+) 0' El., North Floor Survey Unit F8260161 Prepared By: __ ._ _ __ _ _. _ __ _Date: 11/7/i0o "
FSS Engineer Reviewed By Lead SSEgineDate:r Lead FSS Engineer Approved By: Date:
Dismantlement S'4erintendent, Radiological
FINAL STATUS SURVEY
SUMMARY
REPORT Survey Unit:
F8260161, Turbine Building (+) 0' El. North Floor 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/1 00 cm 2 . Direct measurements on the grade elevation showed a mean gross activity leyel 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.
During characterization surveys of F8260131 (Turbine Building (+) 0' El., North Floor, Class 2), beta measurements identified activity within a 2-meter by 3-meter area that exceeded the DCGL of 43,000 dpm/100 cm 2 . The area was subsequently remediated and reclassified as a Class 1 structure, based on the classification procedure (DSIP-0020). As a result of the reclassification, a new survey package was initiated as F8260161.
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 11.6 m2 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 8 FSS Summary Report F8260161
Table 1. Survey Unit Design Parameters Survey Design Value Comment Parameter Survey Area: F826 Turbine Building (+) 0' El.
North Floor Survey Unit: 0161 Structure Surface Class: 1 LTP Table 5-4 SU Area (m2 ): 11.6 Evaluator: D. Anderson DCGL (dpm/100 cm 2): 43,000 Gross Activity DCGL Area Factor: 17.7 Class 1 Design DCGLemc 761,100 Class 1 (dpm/100 cm 2):
LBGR (dpm/100 cm 2): 25,030 Adjusted 2
Design Sigma (dpm/100 cm ): 5,990 Type I Error: 0.05 Type II Error: 0.05 Predominant Nuclide: Cs-137 Sample Area (m2): 0.7 Class 1 Scan Area (M2): 11.6 Scan Coverage (%): 100% Class 1 ZlI, :
1.645 ZI-0 : 1.645 Sign P: 0.99865 Calculated Relative Shift: 3 Relative Shift Used: 3 Uses 3.0 if Relative Shift is
>3 N-Value: 11 Design N-Value + 20%: 14 NUREG-1575 Table 5-5 Design Min Samples N: 14 Class 1 Grid Spacing L: 0.9 Class 1 Page 3 of 8 FSS Summary Report F8260161
Survey Results:
A total of 15 direct measurements were made in F8260161. The results including mean, median, standard deviation and range are shownin Table 2. All direct measurements were less than the DCGL. None of the scan measurements indicated areas of elevated activity. Scan activity ranged from 3,236 to 20,988 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.
Table 2. Direct Measurement Results Measurement ID Gross Activit (dpm/100 cm F8260161-CO001BD 1,401 F8260161-CO002BD 2,692 F8260161-CO003BD 1,909 F8260161 -CO004BD 1,442 F8260161 -CO005BD 1,452 F8260161-CO006BD 1,395 F8260161-CO007BD 1,452 F8260161-C0008BD 7,672 F8260161-CO009BD 1,344 F8260161-Co01OBD 2,397 F8260161-Co01o1 BD 3,496 F8260161-Co012BD 2,277 F8260161-Co013BD 6,811 F8260161-CO014BD 1,499 F8260161-CO015BD 1,515 Mean: 2,584 Median: 1,515 Standard Deviation: 1,995 Range: 1,344 - 7,672 Page 4 of 8 FSS Summary Report F8260161
Table 3. Removable Surface Activity Results Measurement ID Surface Beta Activity (dpm/100 cm 2 )
F8260161C0001SM -3.53 F8260161 C0002SM -4.82 F8260161 C0003SM -3.53 F8260161CO004SM 0.34 F8260161 C0005SM -2.24 F8260161 C0006SM -6.11 F8260161 C0007SM -0.95 F8260161 C0008SM -3.53 F8260161CO009SM -2.24 F8260161Co010SM -3.53 F8260161C0011SM -2.24 F8260161 C001 2SM -3.53 F8260161C0013SM -3.53 F8260161CO014SM -0.95 F8260161Co015SM 0.34 Mean: -2.67 Median: -3.53 Standard Deviation: 1.8 Range: -6.11 to 0.34 Page 5 of 8 FSS Summary Report F8260161
Survey Unit Data Assessment:
The survey design required 15 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 6 of 8 FSS Summary Report F8260161
Table 4. Data Assessment Results Survey Results Parameter Value Comment Material Background Used (dpm/100 cm'): N/A Ambient Background Used (dpm/100 cm2): N/A Average Ambient BKG = 0 Actual Direct Measurements (N): 15 Median (dpm/100 cm 2): 1,515 Mean (dpm/100 cm 2): 2,584 Direct Measurement Standard Deviation 1,995 2
(dpm/ 100 cm ):
Total Standard Deviation (dpm/100 cm 2
): 1,995 Based on samples and backgrounds.
Maximum (dpm/100 2 cm ): 7,672 Material Type: N/A Background Subtract.Not Applied Sign Test Final N Value: 15 S+ Value: 15 Critical Value: 11 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 7 of 8 FSS Summary Report F8260161
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 wasdesigned 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 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. 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 F8260161 meets the release criteria of 10CFR20.1402.
Page 8 of 8 FSS Summary Report F8260161
Attachment 1 Maps July 17, 2008 Survey Unit F8260161
. il I LII -5 0
DLIFII"F- J ii]
a' 0 0 1 00D 00 00[
o] n n RD 00[ Rn II 0
N Location of Turbine Building inside the Industrial Area 0I1 00 ON N
Map F82601.61-1, North Turbine Building (+) 0 Elevation Class 1 Area (floor) 0 2 4 6 Distance in Meters Area Estimate: 11.6 square meters
CD 0
t)
ON N Map F8260161-2, North Turbine Building (+) 0 Elevation 0 0.25 0.5 0.75 1.0 Class 1 Area Distance in Meters Random Start Location
Distance in meters (D from East wall 0.6 m fjA 1.3 m 2.0 m EE E E E E
() z 019 -~CO.o C:
00 ONk ON Map F8260161-3, North Turbine Building (+) 0' Elevation N Class 1 Area Beta Direct Measurements 0 025 0.5 0.75 1.0 F8260161 C0001BD to F8260161 C0015BD Distance in Meters 0.7 m by 0.7 m cgrid spacing
0 (II 00 Map F8260161-4, North Turbine Building (+) 0' Elevation Class 1 Area Beta Scan Measurements N F8260161C0001 BS to F8260161 C0006BS
. Juncture Scan Measurements 0
I 0,25 0.5 0.75 1.0 F8260161C0001JS to F8260161C0004JS Distance in Meters
Attachment 2 Instrumentation July 17, 2008 Survey Unit F8260161
Table 2-1. Survey Unit Instrumentation Instrument Detector MDC Static MDC Scan Model; Serial No. Model; Serial No. (dpm/100 cm2 ) (dpm/100 cm2)
M2350; 193715 43-68B; 148630 433 1,033 M2350; 193715 43-116-IB; 190643 491 739 Tennelec; 0401171 N/A 5.88 dpm c N/A 11.71 dpm Table 2-2. Investigation Criteria and DCGL Parameter Value (dpm/100 cm 2)
Investigation Criteria - Direct 761,100 Investigation Criteria - Scan 761,100 DCGLw 43,000 DCGLEMC 761,100 Page 2 of 2 Att. 2 Instrumentation F8260161
Attachment 3 Investigation July 17, 2008 Survey Unit F8260161 (none required)
Attachment 4 Data Assessment July. 17, 2008 Survey Unit F8260161
F8260161 Gross Activity Sample Results Quantile Plot DCGL = 43000 dpm/1 00cm2 8,000 7,000 7,000+
7,00 5,000
, 4,000 CO)
- ° r
<3,000 -
2,000
.*1515 0 -
0 20 40 60 80 100 Percentile
- Direct Measurements (dpm/100cm2) - median -75th Percentile 50th Percentile ON _
(tQ U) 0 o F8260161 Gross Activity Sample Results Scatter Plot DCGL = 43000 dpm100=cn 10000 o" 8000 o oo6000 4000 o 00
-2000
-20000000000 o 0 0 0 0 0 0 0 0) 0 0 0 0 0 oU 0 U 0 U 0 U 0 U 0 U 0U 0U 0U 0U 0U 0U 0U 0U 0U Measurement Locations Gross Actt Average "+3StDev" - "-3StDev
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CDQ 0
F8260161 Gross Activity Frequency Plot DCGL = 43000 dpm/1 00cm2 9
8 6" 7 6
U- 5 C
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('4 C%'I 00 CO Bins - Upper End Value (dpm/100cm2)
ON