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| number = ML090830547
| number = ML090830547
| issue date = 02/10/2009
| issue date = 02/10/2009
| title = Rancho Seco Final Status Survey Report for February 10, 2009, Cooling Tower Buffer (West), Survey Unit F8080032
| title = Final Status Survey Report for February 10, 2009, Cooling Tower Buffer (West), Survey Unit F8080032
| author name = Brown E L
| author name = Brown E
| author affiliation = Sacramento Municipal Utility District (SMUD)
| author affiliation = Sacramento Municipal Utility District (SMUD)
| addressee name =  
| addressee name =  
Line 17: Line 17:


=Text=
=Text=
{{#Wiki_filter:Rancho Seco Final Status Survey Summary Report February 10, 2009 Cooling Tower Buffer (West)Survey Unit F8080032 Prepared By: & t,. /&-o Do Date: 21/6/c,/2o FSS Engineer Reviewed By:" J-q kate: -Cd Lead FSS Engineer Approved By: 2 Date: _-"________
{{#Wiki_filter:Rancho Seco Final Status Survey Summary Report February 10, 2009 Cooling Tower Buffer (West)
Dismantlement Superi endent, Radiological FINAL STATUS SURVEY  
Survey Unit F8080032 Prepared By: &       t,. /&-o   Do         Date: 21/6/c,/2o FSS Engineer Reviewed By:"*      J-q       kate:                   -     Cd Lead FSS Engineer Approved By:     z*    2                   Date: _-"________
Dismantlement Superi       endent, Radiological
 
FINAL STATUS SURVEY  


==SUMMARY==
==SUMMARY==
REPORT Survey Unit: F8080032, Cooling Tower Buffer (West)Survey Unit
REPORT Survey Unit:
F8080032, Cooling Tower Buffer (West)
Survey Unit


== Description:==
== Description:==


Operating History: The cooling towers and basins were part of the condenser cooling water system. The paved area comprising the basins was not reported to have been used for the storage of radioactive material.
Operating History: The cooling towers and basins were part of the condenser cooling water system. The paved area comprising the basins was not reported to have been used for the storage of radioactive material. Operating records and the HSA document one event with the potential for a release of radioactivity associated with this survey area.
Operating records and the HSA document one event with the potential for a release of radioactivity associated with this survey area.Site Characterization:
Site Characterization: Direct measurements were made of the exterior surfaces of the structure which confirmed the presence of plant-derived radionuclides. Direct structure measurements showed a mean gross activity level of 4,952 dpm/100 cm2 and a maximum value of 6,289 dpm/100 cm2. Based on the classification procedure (DSIP-0020) and levels of gross activity reported, the area was determined to be a Class 2 area.
Direct measurements were made of the exterior surfaces of the structure which confirmed the presence of plant-derived radionuclides.
HSA Events: PDQ-930036.
Direct structure measurements showed a mean gross activity level of 4,952 dpm/100 cm2 and a maximum value of 6,289 dpm/100 cm2. Based on the classification procedure (DSIP-0020) and levels of gross activity reported, the area was determined to be a Class 2 area.HSA Events: PDQ-930036.
Survey Unit Design Information:
Survey Unit Design Information:
The Survey Unit Design Parameters are presented in Table I below. The survey unit and measurement locations are depicted on the maps in Attachment  
The Survey Unit Design Parameters are presented in Table I 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 1130 m 2 were scanned for approximately 20% coverage. The instrumentation used for the survey along with the MDC values are listed in Tables 2-1 and 2-2 in Attachment 2.
: 1. Direct measurement locations were determined using a random-start, fixed grid pattern and 1130 m 2 were scanned for approximately 20% coverage.
Page 2 of 7                         FSS Summary Report                             F8080032
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 7 FSS Summary Report F8080032 Table 1. Survey Unit Design Parameters Survey Design Parameter Value Comment Survey Area: F808 Cooling Tower Buffer (West)Survey Unit: 0032 Open Land Area Class: 2 LTP Table 5-4 SU Area (m2): 5547 Evaluator:
 
Erin L. Brown DCGL Cs137 surrogate (pCi/g): 51.2 Area Factor: N/A Class 2 Design DCGLemc (pCi/g): N/A Class 2 LBGR (pCi/g): 25.6 Default = 50% DCGL Design Sigma (pCi/g): 0.92 LTP Table 5-4C, Rev. No. I Type I Error: 0.05 Type II Error: 0.05 Nuclide: Cs137 Sample Area (m2): 396.2 Class 2 Total Area Scanned (m2): 1130 Scan Coverage (%): 20.4% Class 2 Zla : 1.645 ZI-1 : 1.645 Sign P: 0.99865 Calculated Relative Shift: 27.8 Relative Shift Used: 3 Uses 3.0 if Rel Shift >3 N-Value: 11 Design N-Value + 20%: 14 NUREG-1575 Table 5-5 Grid Spacing L: 19.9 Class 2 Page 3 of 7 FSS Summary Report F8080032 Survey Results: A total of 14 direct measurements were made in F8080032.
Table 1. Survey Unit Design Parameters Survey Design Parameter                 Value                       Comment Survey Area:                       F808   Cooling Tower Buffer (West)
The results including mean, median, standard deviation and range are shown in Table 2. All of the direct measurements were less than the DCGL. None of the ISOCS scan measurements indicated activity above the MDC (2.56E-01 to 4.25E-01) for Cs-137.Table 2. Direct Measurement Results (all activity values in pCi/g)Measurement ID Cs137 MDA Cs137 Activity Uncertainty Mean: L O1EOO Median: I .01 OO, Standard Deviation:~
Survey Unit:                       0032   Open Land Area Class:                         2 LTP Table 5-4 SU Area (m2):                     5547 Evaluator:             Erin L. Brown DCGL Cs137 surrogate (pCi/g):                       51.2 Area Factor:                       N/A   Class 2 Design DCGLemc (pCi/g):                         N/A   Class 2 LBGR (pCi/g):                       25.6 Default = 50% DCGL Design Sigma (pCi/g):                       0.92 LTP Table 5-4C, Rev. No. I Type I Error:                       0.05 Type II Error:                       0.05 Nuclide:                   Cs137 Sample Area (m2):                     396.2   Class 2 Total Area Scanned (m2):                       1130 Scan Coverage (%):                       20.4%   Class 2 Zla :                   1.645 ZI-1 :                   1.645 Sign P:                 0.99865 Calculated Relative Shift:                       27.8 Relative Shift Used:                           3 Uses 3.0 if Rel Shift >3 N-Value:                           11 Design N-Value + 20%:                             14 NUREG-1575 Table 5-5 Grid Spacing L:                       19.9 Class 2 Page 3 of 7                     FSS Summary Report                         F8080032
4.1 8E-02 Range: 9.12E-01 to 1.08E00 F8080032 A0001GD 1.04E00 < 1.04E00 F8080032 A0002GD 9.92E-01 < 9.92E-01 F8080032 A0003GD 9.72E-01 < 9.72E-01 F8080032 A0004GD 1.03E00 < 1.03E00 F8080032 A0005GD 9.83E-01 < 9.83E-01 F8080032 A0006GD 9.12E-01 < 9.12E-01 F8080032 A0007GD 9.87E-01 < 9.87E-01 F8080032 A0008GD 9.90E-01 < 9.90E-01 F8080032 A0009GD 1.03E00 < 1.03E00 F8080032 AOO1OGD 1.08E00 < 1.08E00 F8080032 AOO11GD 1.05E00 < 1.05E00 F8080032 A0012GD 1.04E00 < 1.04E00 F8080032 A0013GD 9.88E-01 < 9.88E-01 F8080032 A0014GD 1.02E00 < 1.02E00 Page 4 of 7 FSS Summary Report F8080032 Survey Unit Data Assessment:
 
The survey design required 14 direct measurements for the Sign Test. The critical value and the results of the Sign Test are presented in Table 3. 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 5 of 7 FSS Summary Report F8080032 Table 3. Data Assessment Results Survey Results Parameter Value Comment Actual Direct Measurements (N): 14 Median (pCi/g): 1.0LEO Mean (pCi/g): 1.0LEO0 Standard Deviation (pCi/g): 4.18E-02 Maximum (pCi/g): 1 .08E00 Sign Test Final N Value: 14 S+ Value: 14 Critical Value: 10 Sufficient Samples Collected:
Survey Results:
Yes Maximum Value < DCGL: Yes Median Value < DCGL: Yes Mean Value < DCGL: Yes Maximum Value < DCGLemc: N/A Class 2 Standard Deviation  
A total of 14 direct measurements were made in F8080032. The results including mean, median, standard deviation and range are shown in Table 2. All of the direct measurements were less than the DCGL. None of the ISOCS scan measurements indicated activity above the MDC (2.56E-01 to 4.25E-01) for Cs-137.
<= Sigma: Yes Pass the Sign Test? Yes Reject the Null Hypothesis?
Table 2. Direct Measurement Results (all activity values in pCi/g)
Yes The survey unit passes all conditions?
Measurement ID             Cs137 MDA                   Cs137 Activity   Uncertainty Mean:                                       L O1EOO Median:                                       I .01 OO, Standard Deviation:~                                       4.1 8E-02 Range:                               9.12E-01 to 1.08E00 F8080032 A0001GD               1.04E00                     < 1.04E00 F8080032 A0002GD               9.92E-01                     < 9.92E-01 F8080032 A0003GD               9.72E-01                     < 9.72E-01 F8080032 A0004GD               1.03E00                     < 1.03E00 F8080032 A0005GD               9.83E-01                     < 9.83E-01 F8080032 A0006GD               9.12E-01                     < 9.12E-01 F8080032 A0007GD               9.87E-01                     < 9.87E-01 F8080032 A0008GD               9.90E-01                     < 9.90E-01 F8080032 A0009GD               1.03E00                     < 1.03E00 F8080032 AOO1OGD               1.08E00                     < 1.08E00 F8080032 AOO11GD               1.05E00                     < 1.05E00 F8080032 A0012GD               1.04E00                     < 1.04E00 F8080032 A0013GD               9.88E-01                   < 9.88E-01 F8080032 A0014GD               1.02E00                     < 1.02E00 Page 4 of 7                       FSS Summary Report                         F8080032
Yes Page 6 of 7 FSS Summary Report F8080032 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 was designed as a Class 2 land survey and the sample results are consistent with that classification.
The survey design required 14 direct measurements for the Sign Test. The critical value and the results of the Sign Test are presented in Table 3. 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.Conclusion:
Page 5 of 7                       FSS Summary Report                         F8080032
The FSS of this survey unit was properly designed as a Class 2 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. All of the direct measurements were less than 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 F8080032 meets the release criteria of 1OCFR20.1402.
 
Page 7 of 7 FSS Summary Report 1F8080032 Attachment 1 Maps February 10, 2009 Survey Unit F8080032 (D 41 00 6813044E 1BB9193N 6813030E 1889072N 6813454E 1889207N 6813454E 1889050N 6813454E 1888915N 6813031E 6813443E 1888915N 1888915N 0 5 10 15 20 25 SCALE METERS (a 171 00 C0 0 C to 000smuo SACRAMENTO MUNICIPAL UTILITY DISTRICT COOLING TOWER BUFFER GEN ARRGMT SURFACE AREA ESTIMATE F8080032-M1 FILE: 808003.02 RC RAYMOND p O'Q CD 0 &#xfd;-p&#xfd;II II II II II II Ii 8 II I -0~(flU)Inc II II II 6813367.75E 1889181.OON REF.KEY PLAN-4 p t cc-I'00 00 0 0 K)*Smn SACRAMENTO MUNICIPAL UTILITY DISTRICT SCALE METERS COOLING TOWER BUFFER GAMMA DIRECT MEASUREMENT LOCATIONS FILE: 808003.02 SHEET 1 OF 2 RC RAYMOND, (D 0 KEY PLAN o 5 10 15 20 25 SCALE METERS 00 00 00 oQ*# muo SACRAMENTO MUNICIPAL UTILITY DISTRICT COOLING TOWER BUFFER GAMMA SCAN MEASUREMENT LOCATIONS Q8080032-M3 FILE: 808003.02 RC RAYMONI Attachment 2 Instrumentation February 10, 2009 Survey Unit F8080032 Table 2-1. Survey Unit Instrumentation Detector Detector Serial Instrument Model No.MDC No.Inspector N/A 08051294 Asphalt -1.08E00 pCi/g Cs-137 Asphalt -1.06E00 pCi/g Co-60 Inspector N/A 03069793 Asphalt -1.04E00 pCi/g Cs- 137 Asphalt -1.03E00 pCi/g Co-60 ISOCS N/A 2983947 Asphalt -4.25E-01 pCi/g Cs- 137 Asphalt -2.70E-01 pCi/g Co-60 Table 2-2. Investigation Criteria and DCGL Instrument Parameter Value ISOCS Investigation Criteria -Scan Asphalt- 23 pCi/g Cs-137 All DCGLw 51.2 Cs-137 12.6 Co-60 All DCGLEMC N/A Page 2 of 2 Att. 2 Instrumentation F8080032 Attachment 3 Investigation February 10, 2009 Survey Unit F8080032 (none required)
Table 3. Data Assessment Results Survey Results Parameter               Value           Comment Actual Direct Measurements (N):           14 Median (pCi/g): 1.0LEO Mean (pCi/g): 1.0LEO0 Standard Deviation (pCi/g): 4.18E-02 Maximum (pCi/g):   1.08E00 Sign Test Final N Value:         14 S+ Value:       14 Critical Value:       10 Sufficient Samples Collected:       Yes Maximum Value < DCGL:             Yes Median Value < DCGL:           Yes Mean Value < DCGL:           Yes Maximum Value < DCGLemc:               N/A Class 2 Standard Deviation <= Sigma:           Yes Pass the Sign Test?       Yes Reject the Null Hypothesis?         Yes The survey unit passes all conditions?       Yes Page 6 of 7                     FSS Summary Report                 F8080032
Attachment 4 Data Assessment February 10, 2009 Survey Unit F808003 2 (DQ t'J 0F8080032 Quantile Plot Csl 37 DCGL = 51.2 pCi g 1.080-1.060 ~-1.040 S1.020____  
 
.0> _1.01.00 S0.980 C C- ~- ---. -_ -~~7 ---**--0.960 CD fl 0.920 ~ , ~0.900 , p 0 20 40 60 80 100 Percentile Activity -- Median ---75th Percentile  
Survey Unit Investigations and Results:
.... 50th Percentile 1711 00 00 C:)
No investigations were required for either direct or scan measurements and no investigation results are reported.
CI)00 C0 C )F8080032 Scatter Plot Cs137 DCGL = 51.2 pCIg 1.20E+00............  
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.
.1133 1.00E+00 0 0 0 .0. 0. "-.....--.. .. ------- ------------.883' 8.00E-01 U CL 6.OOE-01001E-01 2.00E-01 0.00E+00_ t.p 0,, e 4, ,, 1 0, 1 &#xfd; 1: Measurement Locations 0 ActMity &#xfd;- Average --"+3StDev -.-3StDev"I  
Changes in Initial Survey Unit Assumptions:
-o 00 0 00 C)C>Uj~F8080032 Frequency Plot Csl 37 DCGL = 51.2 pCi/g a.)a)r-U-C.-0 4)&deg;, 03 5 4 3 2 1 0 oNIb Bins -Upper End Value (pCi/g)}}
The survey unit was designed as a Class 2 land 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.
 
==
Conclusion:==
 
The FSS of this survey unit was properly designed as a Class 2 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. All of the direct measurements were less than 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 F8080032 meets the release criteria of 10CFR20.1402.
Page 7 of 7                         FSS Summary Report                             1F8080032
 
Attachment 1 Maps February 10, 2009 Survey Unit F8080032
 
(D 41 00 6813454E 1889207N 6813044E 1BB9193N 6813030E 1889072N 6813454E 1889050N 6813031E            6813443E          6813454E 1888915N             1888915N           1888915N 171 00 C0 0 5 10 15 20 25 SCALE METERS       (a 0
C                                                     COOLING TOWER BUFFER to                                                GEN ARRGMT SURFACE AREA ESTIMATE 000smuo SACRAMENTO MUNICIPAL                F8080032-M1 UTILITY DISTRICT FILE: 808003.02                     RC RAYMOND
 
II p
O'Q CD   II 0-p&#xfd;
    &#xfd; II                                           6813367.75E II                                           1889181.OON REF.
II KEY PLAN II Ii 8
II I         -
0~
(flU)
Inc
-4   II p
t cc II II
                  -I' SCALE 00                                                                             METERS 00 COOLING TOWER BUFFER
                      *Smn 0
0 K)
GAMMA DIRECT MEASUREMENT LOCATIONS SACRAMENTO MUNICIPAL UTILITY DISTRICT F8080032-o*M2 FILE: 808003.02     SHEET 1 OF 2           RC RAYMOND,
 
(D 0
KEY PLAN o 5 10 15 20 25 SCALE 00                                                    METERS 00 00 oQ                               COOLING TOWER BUFFER
    *#     muo             GAMMA SCAN MEASUREMENT LOCATIONS SACRAMENTO MUNICIPAL UTILITY DISTRICT Q8080032-M3 FILE: 808003.02                       RC RAYMONI
 
Attachment 2 Instrumentation February 10, 2009 Survey Unit F8080032
 
Table 2-1. Survey Unit Instrumentation Detector     Detector Serial Instrument     Model               No.MDC No.
Inspector     N/A           08051294             Asphalt - 1.08E00 pCi/g Cs-137 Asphalt - 1.06E00 pCi/g Co-60 Inspector     N/A           03069793             Asphalt - 1.04E00 pCi/g Cs- 137 Asphalt - 1.03E00 pCi/g Co-60 ISOCS       N/A             2983947             Asphalt - 4.25E-01 pCi/g Cs- 137 Asphalt - 2.70E-01 pCi/g Co-60 Table 2-2. Investigation Criteria and DCGL Instrument           Parameter                               Value ISOCS     Investigation Criteria - Scan       Asphalt- 23 pCi/g Cs-137 All     DCGLw                                       51.2 Cs-137 12.6 Co-60 All     DCGLEMC                                           N/A Page 2 of 2                   Att. 2 Instrumentation                       F8080032
 
Attachment 3 Investigation February 10, 2009 Survey Unit F8080032 (none required)
 
Attachment 4 Data Assessment February 10, 2009 Survey Unit F808003 2
 
(DQ t'J 0F8080032                                                               Quantile Plot Csl 37 DCGL = 51.2 pCi g 1.080-1.060                             ~-
1.040
            > _S1.020____                                                                                         .0 1.01.00 S0.980 CD C                   ~-
C-   - --.       -_ -~~7 -   -   -**--
0.960 fl                                 .,*.-.
0.920       ~             ,           ~
0.900 p                      ,
0               20                       40               60             80       100 Percentile Activity         -- Median       -   - - 75th Percentile .... 50th Percentile 1711 00 00 C:)
 
F8080032 Scatter Plot Cs137 DCGL = 51.2 pCIg 1.20E+00   ............                         ..................                             . 1133 1.00E+00           0       0   .0.                                             0             0. "
                                -   .- - . - -   .  -- - -               - -   - -     - ..-   - - - - .883
    ' 8.00E-01 U
CL 6.OOE-01
* 001E-01 CI) 2.00E-01 0.00E+00
_ Op* Q0*,*          t.p 0,, e       4,,.o,,*                      10, 1 &#xfd; 1:*
C )
Measurement Locations 0   ActMity &#xfd;-   Average -       - "+3StDev - . -3StDev"I 00 C0
 
F8080032 Frequency Plot Csl 37 DCGL = 51.2 pCi/g 5
-o a.)   4 r-a)
U-3 C.-
00  0 0  4)
    &deg;,
2 03 1
00 0
C)
C>
Uj~
oNIb Bins - Upper End Value (pCi/g)}}

Latest revision as of 15:43, 12 March 2020

Final Status Survey Report for February 10, 2009, Cooling Tower Buffer (West), Survey Unit F8080032
ML090830547
Person / Time
Site: Rancho Seco
Issue date: 02/10/2009
From: Ellen Brown
Sacramento Municipal Utility District (SMUD)
To:
NRC/FSME
Shared Package
ML090830613 List: ... further results
References
DPG 09-097, F8080032
Download: ML090830547 (18)
v • d • e


Text

Rancho Seco Final Status Survey Summary Report February 10, 2009 Cooling Tower Buffer (West)

Survey Unit F8080032 Prepared By: & t,. /&-o Do Date: 21/6/c,/2o FSS Engineer Reviewed By:"* J-q kate: - Cd Lead FSS Engineer Approved By: z* 2 Date: _-"________

Dismantlement Superi endent, Radiological

FINAL STATUS SURVEY

SUMMARY

REPORT Survey Unit:

F8080032, Cooling Tower Buffer (West)

Survey Unit

Description:

Operating History: The cooling towers and basins were part of the condenser cooling water system. The paved area comprising the basins was not reported to have been used for the storage of radioactive material. Operating records and the HSA document one event with the potential for a release of radioactivity associated with this survey area.

Site Characterization: Direct measurements were made of the exterior surfaces of the structure which confirmed the presence of plant-derived radionuclides. Direct structure measurements showed a mean gross activity level of 4,952 dpm/100 cm2 and a maximum value of 6,289 dpm/100 cm2. Based on the classification procedure (DSIP-0020) and levels of gross activity reported, the area was determined to be a Class 2 area.

HSA Events: PDQ-930036.

Survey Unit Design Information:

The Survey Unit Design Parameters are presented in Table I 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 1130 m 2 were scanned for approximately 20% coverage. 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 7 FSS Summary Report F8080032

Table 1. Survey Unit Design Parameters Survey Design Parameter Value Comment Survey Area: F808 Cooling Tower Buffer (West)

Survey Unit: 0032 Open Land Area Class: 2 LTP Table 5-4 SU Area (m2): 5547 Evaluator: Erin L. Brown DCGL Cs137 surrogate (pCi/g): 51.2 Area Factor: N/A Class 2 Design DCGLemc (pCi/g): N/A Class 2 LBGR (pCi/g): 25.6 Default = 50% DCGL Design Sigma (pCi/g): 0.92 LTP Table 5-4C, Rev. No. I Type I Error: 0.05 Type II Error: 0.05 Nuclide: Cs137 Sample Area (m2): 396.2 Class 2 Total Area Scanned (m2): 1130 Scan Coverage (%): 20.4% Class 2 Zla : 1.645 ZI-1 : 1.645 Sign P: 0.99865 Calculated Relative Shift: 27.8 Relative Shift Used: 3 Uses 3.0 if Rel Shift >3 N-Value: 11 Design N-Value + 20%: 14 NUREG-1575 Table 5-5 Grid Spacing L: 19.9 Class 2 Page 3 of 7 FSS Summary Report F8080032

Survey Results:

A total of 14 direct measurements were made in F8080032. The results including mean, median, standard deviation and range are shown in Table 2. All of the direct measurements were less than the DCGL. None of the ISOCS scan measurements indicated activity above the MDC (2.56E-01 to 4.25E-01) for Cs-137.

Table 2. Direct Measurement Results (all activity values in pCi/g)

Measurement ID Cs137 MDA Cs137 Activity Uncertainty Mean: L O1EOO Median: I .01 OO, Standard Deviation:~ 4.1 8E-02 Range: 9.12E-01 to 1.08E00 F8080032 A0001GD 1.04E00 < 1.04E00 F8080032 A0002GD 9.92E-01 < 9.92E-01 F8080032 A0003GD 9.72E-01 < 9.72E-01 F8080032 A0004GD 1.03E00 < 1.03E00 F8080032 A0005GD 9.83E-01 < 9.83E-01 F8080032 A0006GD 9.12E-01 < 9.12E-01 F8080032 A0007GD 9.87E-01 < 9.87E-01 F8080032 A0008GD 9.90E-01 < 9.90E-01 F8080032 A0009GD 1.03E00 < 1.03E00 F8080032 AOO1OGD 1.08E00 < 1.08E00 F8080032 AOO11GD 1.05E00 < 1.05E00 F8080032 A0012GD 1.04E00 < 1.04E00 F8080032 A0013GD 9.88E-01 < 9.88E-01 F8080032 A0014GD 1.02E00 < 1.02E00 Page 4 of 7 FSS Summary Report F8080032

Survey Unit Data Assessment:

The survey design required 14 direct measurements for the Sign Test. The critical value and the results of the Sign Test are presented in Table 3. 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 5 of 7 FSS Summary Report F8080032

Table 3. Data Assessment Results Survey Results Parameter Value Comment Actual Direct Measurements (N): 14 Median (pCi/g): 1.0LEO Mean (pCi/g): 1.0LEO0 Standard Deviation (pCi/g): 4.18E-02 Maximum (pCi/g): 1.08E00 Sign Test Final N Value: 14 S+ Value: 14 Critical Value: 10 Sufficient Samples Collected: Yes Maximum Value < DCGL: Yes Median Value < DCGL: Yes Mean Value < DCGL: Yes Maximum Value < DCGLemc: N/A Class 2 Standard Deviation <= Sigma: Yes Pass the Sign Test? Yes Reject the Null Hypothesis? Yes The survey unit passes all conditions? Yes Page 6 of 7 FSS Summary Report F8080032

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 2 land 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.

==

Conclusion:==

The FSS of this survey unit was properly designed as a Class 2 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. All of the direct measurements were less than 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 F8080032 meets the release criteria of 10CFR20.1402.

Page 7 of 7 FSS Summary Report 1F8080032

Attachment 1 Maps February 10, 2009 Survey Unit F8080032

(D 41 00 6813454E 1889207N 6813044E 1BB9193N 6813030E 1889072N 6813454E 1889050N 6813031E 6813443E 6813454E 1888915N 1888915N 1888915N 171 00 C0 0 5 10 15 20 25 SCALE METERS (a 0

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    1. muo GAMMA SCAN MEASUREMENT LOCATIONS SACRAMENTO MUNICIPAL UTILITY DISTRICT Q8080032-M3 FILE: 808003.02 RC RAYMONI

Attachment 2 Instrumentation February 10, 2009 Survey Unit F8080032

Table 2-1. Survey Unit Instrumentation Detector Detector Serial Instrument Model No.MDC No.

Inspector N/A 08051294 Asphalt - 1.08E00 pCi/g Cs-137 Asphalt - 1.06E00 pCi/g Co-60 Inspector N/A 03069793 Asphalt - 1.04E00 pCi/g Cs- 137 Asphalt - 1.03E00 pCi/g Co-60 ISOCS N/A 2983947 Asphalt - 4.25E-01 pCi/g Cs- 137 Asphalt - 2.70E-01 pCi/g Co-60 Table 2-2. Investigation Criteria and DCGL Instrument Parameter Value ISOCS Investigation Criteria - Scan Asphalt- 23 pCi/g Cs-137 All DCGLw 51.2 Cs-137 12.6 Co-60 All DCGLEMC N/A Page 2 of 2 Att. 2 Instrumentation F8080032

Attachment 3 Investigation February 10, 2009 Survey Unit F8080032 (none required)

Attachment 4 Data Assessment February 10, 2009 Survey Unit F808003 2

(DQ t'J 0F8080032 Quantile Plot Csl 37 DCGL = 51.2 pCi g 1.080-1.060 ~-

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0 20 40 60 80 100 Percentile Activity -- Median - - - 75th Percentile .... 50th Percentile 1711 00 00 C:)

F8080032 Scatter Plot Cs137 DCGL = 51.2 pCIg 1.20E+00 ............ .................. . 1133 1.00E+00 0 0 .0. 0 0. "

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F8080032 Frequency Plot Csl 37 DCGL = 51.2 pCi/g 5

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