ML090830543
| ML090830543 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 02/24/2009 |
| From: | Tallman D Sacramento Municipal Utility District (SMUD) |
| To: | NRC/FSME |
| Shared Package | |
| ML090830613 | List:
|
| References | |
| DPG 09-097, F8000105 | |
| Download: ML090830543 (20) | |
Text
Rancho Seco Final Status Survey Summary Report February 24, 2009 IA N-S Roadway East of BWB Survey Unit F8000105 Prepared By: Dan A. Tallman i.4Q
.___Date: February 24, 2009 FSS Enginreer Reviewed By: oA L
4C ý Date:
'-40 Lead FSS Engineer Approved By:
z 271 Date:
Dismantlement Superintendent, Radiological
FINAL STATUS SURVEY
SUMMARY
REPORT Survey Unit:
F8000105, IA N-S Roadway East of BWB Survey Unit
Description:
Operating History: The Survey Unit consists of the roadway running north and south from the T&R to the intersection with the site exit road east of the solidification pad and BWB. Packaged demolition debris from AB and RB remediation has routinely been transported through the survey unit posing the potential for a small amount of contamination to be deposited along the route.
There were no reports of road contamination in the HSA however, during characterization surveys; documented evidence of contamination adjacent to the roadway was discovered. This isolated area designated as a unique survey unit (8000104) and is being evaluated separately.
Site Characterization: Soil and sediment samples were collected and analyzed for the presence of plant-derived radionuclides. Cs-137 was the only detected nuclide of plant origin with a mean activity level of 0.062 pCi/g and a maximum value of 0.299 pCi/g.
(Site background levels of Cs-137 have been determined to be approximately 0.312 pCi/g.) Based on classification procedure (DSIP-0020), the proximity to a class one survey unit, the potential for contamination resulting from radioactive material transport and the characterization survey data, the roadway running north and south from the T&R to the intersection with the site exit road is a class 2 area.
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 700 m 2 were scanned for approximately 41% coverage. Gamma Direct samples were collected at each direct measurement location and analyzed by Gamma Spec (Genie 2000) Analysis. The instrumentation used for the survey along with the MDC values arie listed in Tables 2-1 and 2-2 in Attachment 2.
Page 2 of 7 FSS Summary Report F8000105
Table 1. Survey Unit Design Parameters Survey Design Parameter Value Comment Survey Area:
F800 IA N-S Roadway East of BWB Survey Unit:
0105 Open Land Area Class:
2 LTP Table 5-4 SU Area (m2):
1696 Evaluator:
D.A.Tallman 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):
0.57 DTBD-06-001, Table 5-4C Type I Error:
0.05 Type II Error:
0.05 Nuclide:
Cs137 Sample Area (m2):
121.1 Class 2 Total Area Scanned (m2):
700 Scan Coverage (%):
41.3%
Class 2 ZI_, :
1.645 Zl-P :
1.645 Sign P:
0.99865 Calculated Relative Shift:
44.9 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:
11 Class 2 Page 3 of 7 FSS Summary Report F8000105
Survey Results:
A total of 16 direct measurements were made in F8000105. 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 scan measurements indicated areas of elevated activity. ISOCS Scan results for Co-60 & Cs-137 < the MDC values provided in Table 2-1. Gamma Direct measurements were counted to the MDC shown in Table 2-1 of Attachment 2.
Table 2. Direct Measurement Results (all activity values in pCi/g)
Measurement ID Cs137 MDA Cs137 Activity Uncertainty Mean: 1/2-<
9.89E-01 Median:
9.72E-01 Standard Deviation: : >Ki<'
7'
- 1. 12E-01 Range:
9.11E-01 to 1.39E00 F8000105 AOO15GD 9.31E-01
< 9.31E-01 F8000105 A0014GD 9.43E-01
< 9.43E-01 F8000105 A0013GD 9.57E-01
< 9.57E-01 F8000105 A0012GD 9.40E-01
< 9.40E-01 F8000105 AOI11GD 9.73E-01
< 9.73E-01 F8000105 AOO1OGD 9.24E-01
< 9.24E-01 F8000105 A0009GD 9.94E-01
< 9.94E-01 F8000105 A0008GD 9.78E-01
< 9.78E-01 F8000105 A0007GD 9.76E-01
< 9.76E-01 F8000105 A0006GD 1.04E00
< 1.04E00 F8000105 A0005GD 9.98E-01
< 9.98E-01 F8000105 A0004GD 1.39E00
< 1.39E00 F8000105 A0003GD 9.71E-01
< 9.71E-01 F8000105 A0002GD 9.16E-01
< 9.16E-01 F8000105 AOOO1GD 9.81E-01
< 9.81E-01 F8000105 A0016GD 9.11E-01
< 9.11E-01 Page 4 of 7 FSS Summary Report F8000105
Survey Unit Data Assessment:
The survey design required 16 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 F8000105
Table 3. Data Assessment Results Survey Results Parameter Value Comment Actual Direct Measurements (N):
16 Median (pCi/g):
9.72E-01 Mean (pCi/g):
9.89E-01 Standard Deviation (pCi/g):
1.12E-01 Maximum (pCi/g):
1.39E00 Sign Test Final N Value:
16 S+ Value:
16 Critical Value:
11 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 F8000105
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 F8000105 meets the release criteria of 10CFR20.1402.
Page 7 of 7 FSS Summary Report F8000105 Maps February 24, 2009 Survey Unit F8000105
CD~
00 Ci) i 0 SIA CENTRA*L YARD KEY PLAN N1T888631 LEGEND IJCONCRETE, 385 SO H, TOTAL 1-_-1 ASPHALT. 9393 SO M, TOTAL R-G'AVEL/SOIL, 4804 SO0 M. TOTAL E651321 EXLD I2ý EE 13-6,31023737-
\\
3T E6P~
3 E68136L
/l E63T36Th E881422 2
/
TTT3T842~
4TEIln'S
/7X X!
r6813442I C6E813495 E63511799 E681T40,9 U
1-T34080 N8832NTSS8382 N 1888387 NI8382V 111888382 A'i..
E6814239 N, 1839820 1 L) 4>.
INDUSTRIAL AREA CENTRAL YARD GENERAL ARRANGEMENT DISTRICT F
0105-Ml.1 EA&E I of 2
IA CENIRAL -J YAR[
KEY PLAN
/i
_E 6813537 E313717 E681 392'
!14239 D6,1 3442 N-If8149 8888209918&
/",
i i
NI838650 E
0
/8 Aep Ettirua2-s INDST"A AEACETRL AR Asph"l-,6961m2 GNERAL ARANGEMEN K
SA-L',E6F8000105800012 ELCi_
E
"------UC Nu 8F7
"/~~~~~
~~
18I8888782,41,-'*29 N
8 8 6,3 1..TN 0 ~
~
1 888626.[tr*t*
NDSRA AE ETRLYR i.--,
/,ph~lt X696 rDE SSURFACE AREA ESTIMATE aSACRAMENTrO M*UN,,:,,ICF 00 10-PA1.L SCAL
-E UTILITY DISTRICT F8 0
10 14E E,--.*
F LE:
RO010 01 0 P A('-;F
ýj r,f P C. RA'YM O N D
+/-~
w 0*
-I oN
- p 9 11 1W 1.......
5 -
...,_I I
HIh
,,H I
-+
Il/
l l
I II11 i
- 1.
+ 1 1
1H 11 111 "
H I
'"t1::
H
+ :
14 1..
1.111..
T X
- '" ' + : '" : i
.................... :T T
w:
t l l l '
- l l l', ' l ', t I '
" III I 'T ' ',I I l l ', l l +, l '.
l l T *.m j
ti.'
- TiH--
-- i s i-ii -i-H-i-sm t*11
- f.
I,~
i-
-in-Iiiim
.sm s
sm m
-i-si I
-i-i-.i-s, T
tH1s1s"i-sm Il I-,+H-H+4 i'
'4-P I-H i i
+/-HI I
h+/-Il*~ -is
-ii
-li-i-i I
i 1
1 1 t i l
.. 1 1 1
' 1 l ' I I ' I,
..I w: m m
'"4,
,,I-
'+/-.....
iH - ii H,,,,,
-Ii iiH i-,-
+ H-i-I-i-I I
+/-
- L ii-iH H+1H-ui+-
HH HH, 1+1-"4+./
JS U
DIRECT MEASUREMENT SRANDOM START POINT SACRAMENTO MUNICIPAL F0015 2
UTILITY DISTRICT
.F8000 0 5
- M
.1 FILE: 800010 PAGF I of 2 N*C RAYMOND 0
2 5
4 S
5 5
5 5
55 2
24 12
CD 1A.A CENTRAL KEY PLAN 00 C) 6)SMUD SALIRAMON ItO Nl)CIPAL U~TILITh' DITPir INDUSTRIAL AREA CENTRAL YARD DIRECT MEASUREMENT LOCATION DETAIL F80001 05-M2.1
0 KEY PLAN 00 C0 Un SACRAMENT~O MUNICIPAL UTILITY' DISTRICT INDUSTRIAL AREA CENTRAL YARD GAMMA (ISOCS)
SCAN MEASUREMENT LOCATIONS F80001 05-M3.1 J qLE:
-80001 0
Pa('F i,
f RC ReAYMON,)D Instrumentation February 24, 2009 Survey Unit F8000105
Table 2-1. Survey Unit Instrumentation Detector Detector Serial Instrument Model MDC No.No.
Asphalt - 1.02 pCi/g Co-60 Inspector N/A 08051294 Asphalt - 1.39 pCi/g Cs-137 ISOCS N/A 2983947 Asphalt - 0.227 pCi/g Co-60 I_
I__
Asphalt- 0.413 pCi/g Cs-137 Table 2-2. Investigation Criteria and DCGL Instrument Parameter Value InSpector Investigation Criteria -
Asphalt - 51.2 pCi/g Cs-37(,,,,.)
Direct Asphalt - 5 pCi/g Co-60 ISOCS Investigation Criteria - Scan Asphalt -29 pCi/g Cs-137 All DCGLw 51.2 Cs-137 12.6 Co-60 All DCGLEMC NA - Class II Page 2 of 2 Att. 2 Instrumentation F8000105 Investigation February 24, 2009 Survey Unit F8000105 (none required)
Data Assessment February 24, 2009 Survey Unit F8000105
CD Ci2 ct-F8000105 Quantile Plot Cs137 DCGL = 51.2 pCi/g u
1.600 1.400 1.200 1.000 0.800 0.600 0.400 0.200 0.000 0.972 0
20 40 60 Percentile 80 100 I
+
Activity -Median
- - 75th Percentile.. -
50th Percentile I
-D O0 F8000105 Scatter Plot C9137 DCGL =51.2 pCllg C')
C')
Cl)
CrC 1.60E+00 1.40E+00 S1.20E+00 U 1.OOE+0O C-S.OOE 82
.0012 4.0012 2.OOE-01
,n nnC nn 0
1.328 o- -
`
`.
7 na
..... m........10.652 I
f N
I I
I I
I I
I J
]
I I
U. ~dU I
ýp 0,tp,.1p "Cl Ci C-4 Cs
'p, 0 p p
-N,
-11 101 01 -OP Op I vsp
- Ip Ip va,0 va va VP tv Ip ve Measurement Locations 0
Activfty -
Average
-+3StDev
"-3StDev -
00 CIO CD C:
0 00 C)
C0 0ý C0 0A F8000105 Frequency Plot Cs1 37 DCGL = 51.2 pCi/g U-c 0
M-09 15 14 13 12 107 9
8 7
6 5
4 3
2 10, N
N Bg),'
Bins - Upper End Value (pCi/g)