ML090850553
| ML090850553 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 07/16/2008 |
| From: | Donna Anderson Sacramento Municipal Utility District (SMUD) |
| To: | NRC/FSME |
| Shared Package | |
| ML090830613 | List:
|
| References | |
| DPG 09-097 | |
| Download: ML090850553 (33) | |
Text
Rancho Seco Final Status Survey Summary Report July 16, 2008 Turbine Building Structural Steel Framing Survey Unit F8260202 Prepared By:
- yi*
Date:
FSS Engineer Reviewed By:7-&ý K9I)&k Date:
, Lead FSS Engineer Approved By:
f Date:
'Z Dismantlement Superintendent, Radiological
FINAL STATUS SURVEY
SUMMARY
REPORT Survey Unit:
F8260202, Turbine Building Structural Steel Framing 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/100 cm2 and a maximum value of 24,900 dpm/1 00 cm2. 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/10.0 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/l00 cm2 and a maximum value of 10,312 dpm/100 cm2. 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 randomly determined and 886.9 m2 were scanned for approximately 10%
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 F8260202
Table 1. Survey Unit Design Parameters Survey Design Value Comment Parameter Survey Area:
F826 Survey Unit:
Class:
SU Area (m):
Evaluator:
DCGL (dpm/100 cm2):
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 (M2):
Scan Coverage (%):
ZI.*0 Sign P:
Calculated Relative Shift:
Relative Shift Used:
N-Value:
Design N-Value + 20%:
Design Min Samples N:
Grid Spacing L:
0202 3
9134.2 D. Anderson 43,000 N/A N/A 39,052 1,316 0.05 0.05 Cs-137 N/A 886.9 10%
1.645 1.645 0.99865 3
3 11 14 14 N/A Turbine Building Structural Steel Framing Structure Surface LTP Table 5-4 Gross Activity DCGL Class 3 Class 3 Adjusted Class 3 Class 3 Uses 3.0 if Relative Shift is
>3 NUREG-1575 Table 5-5 Class 3 Class 3 L
Page 3 of 8 FSS Summary Report F8260202
Survey Results:
A total of 14 direct measurements were made in F8260202. 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 scan measurements indicated areas of elevated activity. Scan activity ranged from 953 to 16,396 dpm/l 00 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 Activity (dpm/lO0 cm')
F8260202-MOO01 BD F8260202-MOO02BD F8260202-MOO03BD F8260202-MOO04BD F8260202-MOOO5BD F8260202-MOO06BD F8260202-MOO07BD F8260202-M0008BD F8260202-MOO09BD F8260202-MOOOBD F8260202-MO011BD F8260202-MOO12BD F8260202-MOO13BD F8260202-MOO14BD Mean:
Median:
Standard Deviation:
Range:
434 465 658 468 508 480 480 566 452 560 1,240 1,446 809 544 651 526 312 434-1,446 Page 4 of 8 FSS Summary Report F8260202
Table 3. Removable Surface Activity Results Measurement ID Surface Beta Activity (dpm/100 cm 2)
F8260202M0001 SM
-4.82 F8260202M0002SM
-2.24 F8260202M0003SM
-2.24 F8260202M0004SM
-3.53 F8260202M0005SM
-4.82 F8260202M0006SM
-4.82 F8260202M0007SM
-2.24 F8260202M0008SM
-4.82 F8260202M0009SM
-4.82 F8260202M0010SM
-3.53 F8260202M0011SM
-4.82 F8260202M0012SM
-3.53 F8260202M0013SM
-2.24 F8260202M0014SM 0.34 Mean:
-3.44 Median:
-3.53 Standard Deviation:
1.56 Range:
-4.82 to 0.34 Page 5 of 8 FSS Summary Report F8260202
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 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 F8260202
Table 4. Data Assessment Results Survey Results Parameter Value Comment Material Background Used (dpm/100 cm 2):
N/A Ambient Background Used (dpm/100 cm2):
N/A Average Ambient BKG = 0 Actual Direct Measurements (N):
14 Median (dpm/100 cm 2):
526 Mean (dpm/100 cm2):
651 Direct Measurement Standard Deviation 312 (dpm/100 cm2):
Total Standard Deviation (dpm/lOO cm 2):
312 Based on samples and backgrounds.
Maximum (dpm/100 cm 2):
1,446 Material Type:
N/A Background Subtract Not Applied 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 3 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 F8260202
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 3 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.
==
Conclusion:==
The FSS of this survey unit was properly designed as a Class 3 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 F8260202 meets the release criteria of 10CFR20.1402.
Page 8 of 8 FSS Summary Report F8260202
Attachment I Maps July 16, 2008 Survey Unit F8260202
00 o
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F 10
.I LQII111 Location of Turbine Building inside the Industrial Area 00 bON I
Map F8260202-1, Turbine Building Structural Steel Framing Location of Turbine Building at Rancho Seco site
2 3
4 5
6 789101123 8 9
10 11 12 13 (41) 0 00 00 C)
C)
U 23' 4" 17'0" 20' 4" 18'4" 18' 10.5" 18' 10.5"
-Is 4 23' 4" 23' 4" 23' 4" 16' 11" N
0 2
4 6
8 Distance in Meters Map F8260202-2, Turbine Building (+) 39' 2" El.
Plan at Turbine Deck Structural Steel Framing Area Estimate: 855.6 sq. meters
0 00 cjký Map F8260202-3, Turbine Building (+) 0' El. to (+) 40' El.
Structural Steel Framing - Crane Supports 00 Included in Structural Steel Framing Estimate for Turbine Deck to 01
2 3
4 5
6 7
8 9
10 11 12 13 0
00 U
-. 9 W-0 Ow 23'4" 17'0" 20' 4" 18'4" 18' 10.5" 18'10.5" 18'4" 23'4" 23' 4" 23' 4" 16' 11" It00 k)
N 0
2 4
6 8
Distance in Meters Map F8260202-4, Turbine Building (+) 19' 10 3/4" El.
Plan at Mezzanine Floor Structural Steel Framing Area Estimate: 3,366.0 sq. meters
00 0I C)
Map F8260202-5, Turbine Building (+) 20' El. to (+) 40' El.
Mezzanine Level Structural Steel Framinq
b C14 8ET..
7LL DEMý1111111in pin 00 T Cross beams Cross beams Horizontal I-beam k)
Map F8260202-6, Turbine Building (+) 20' El.
0 2
4 6
8 Plan at Mezzanine Level Distance in Meters Structural Steel Framing - Vertical I-Beams Area Estimate: 585.8 sq. meters
I CD, 00 0
00) 00 C>
w0 C>
t')
Map F8260202-7, Turbine Building (+) 0' El. to (+) 20' El.
Grade Level Structural Steel Framing
CD 00 00 C)
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- 3 ID 04 I.
. k-pr
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El
~1 CD ib Horizontal I-beam T7 set of beams Cross beams N
0 2
4 6
8 Distance in Meter Map F8260202-8, Turbine Building (+) 0' El.
Plan at Grade Level Structural Steel Framing - Vertical I-Beams Area Estimate: 4,326.8 sq. meters
2 3
4 5
6 7
8 9
10 11 12 13 0b 00 00 z1 (N
ZN CN (N
U.
(0 (N
b 23' 4" 17'0" 20'4" 18'4" 18' 10.5" 18, 10.5" 1i" 4 23'4" 23' 4" 23' 4" 16' 11" 00 0'
I'..
N Map F8260202-9, Turbine Building (+) 39' 2" El.
Turbine Deck Structural Steel Framing Beta Scan Measurements F8260202M001 5BS to F8260202M0030BS, F8260202M0045BS to F8260202M0060BS and F8260202M0073BS to F8260202M0148BS Total Scan Area: 139.6 sq. meters 2
4 6
8 Distance in Meters
2.U 000 00 m
(N 0.t LL 0
,;I _:7 t
Map F8260202-10, Turbine Building (+) 20' El.
oo Mezzanine Level Structural Steel Framing - Vertical Beams o(
rs em B eta Scan Measurements
- o Crs basF8260202M01 65BS to F8260202M01 67BS, k)
CrsbasF8260202MO 169BS to F8260202MO1 71 BS, n
Fg260202M0173BS to F8260202M0175BS, and Distane in Mete~rs Horizontal I-beam r~o')nor)o'f.A4Q'l")e*
f,.- I:A')nnolAAt1QAI~0 Total Scan Area: 32.3 sq. meters
00 2
3 4
6 7
8 9
10 11 12 13
- ýN-ýi'24WE,106e I
H 192BS - 195BS (n
Cn (ZI CO C"
CO Z"N to CO M
CO CO rn 18
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M Ch C)
C1) C4 196BS - 199 w
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M M
M M
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M 351BS - 357BS 1-'A 0LLT11 00 Q
N j;
Go CO 13D 04 CM w
UJ Cý Cn to Cn CO C4 In Ln w it 'T Cq Cn ý'
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Cp 0
Cn 224BS - 226BS 00 CO W*11418
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228BS - 230BS C-4 N
232BS - 234 C')
7:,*"
IM ý4 M CO C"i 00 0
N 236BS - 23813S I 251BS-253BS 257BS-26OBS N00 00 rw "1'8 W F "Ll 40ý
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ND iD CN
'iQW9-1242BS
- 244BS OW24 I24BS
- 2508S
-7 1,254BS-2568S 26 BS-264BS 265BS - 268BS 11 269BS - 271 BS UK OWF13v-1XhQ1Q-Cq'A",AM in Ii~
94813 T5RS 23'4" 17'0" 20'4" 18'4" 18' 10.5" 18'10.5" 18'4" 23' 4" 23'4" 23' 4" 16'11"
-Il 00 C)
N 0
2 4
6 8
Distance in Meters Map F8260202-11, Turbine Building (+) 19'10 3/4" El.
Mezzanine Floor Structural Steel Framing Beta Scan Measurements F8260202M0031BS to F8260202M0044BS, F8260202M0185BS to F8260202M0222BS, F8260202M0224BS to F8260202M0226BS F8260202M0228BS to F8260202M0230BS, F8260202M0232BS to F8260202M0234BS, F8260202M0236BS to F8260202M0238BS, and F8260202M0239BS to F8260202M0421BS Total Scan Area: 319.4 sq. meters
cJQ 0
00 rU.
(6 ft. above grade) 2 231, 235 11 1 1
1 -
FrUT/
3 4
5 6
7 8
9 10 11 57213S - 577BS 578 S S
-583 FA 12 -WPý 584BS A12 I, CO 4 590BS - 59513-596BS 913 1ýý,--V U) 513 (I IN11
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II II I*1 bl Jtl*
II I*1 T
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- 603BS' L'Z
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S - 1I54BS
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I*1 IIf II II
- 1% II I%1 J
II I " Ii II II " LI /
'IL J*L ikll~ liii I~I II II~ liii WLWL NI
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11 1 I C"'
VI Ii II II II II T ---
T"7 (0
(0 1
23'4" 17'0" 20' 4" 18'4" 18' 10.5" 18' 10.5" 18'4" 23' 4" 23'4".
23' 4" 16' 11" 00 0C N
0 2
4 6
8 Distance in Meters Map F8260202-12, Turbine Building (+) 19' 10 3/4" El.
Mezzanine Floor Structural Steel Framing Beta Scan Measurements F8260202M0001BS to F8260202M0014BS, F8260202M0061BS and F8260202M0072BS F8260202M0149BS to F8260202M0164BS, F8260202M0168BS, F8260202M0172BS, F8260202M01 76BS to F8260202M01 81 BS, F8260202M0223BS, F8260202M0227BS, F8260202M0231 BS, F8260202M0235BS and F8260202M0572BS to F8260202M0611BS Total Scan Area: 107.6 sq. meters
("
14WF 184 14WF 184 14WF184 1W 84 14WF 184
-ni-"z 440BS-I4B i
I 422BS -42 SI I 428BS -433BS I l[43413S-419IBSj14I3S-45B I 446BS -451BSl 000 C.P 04 12WF120.--
12WF120 12 13312WF99
<I I
00 61 4 8=___7__
N Map F8260202-13, Turbine Building (+) 0' El.
Grade Level Structural Steel Framing - Vertical I-Beams O
2 4
6 8
et Scan Measurements Distance in Meters B t F8260202M0422BS to F8260202M0499BS Total Scan Area: 149.8 sq, meters
2 3
4 5
6 7
8 9
10 11 12 13 0
00 I
Ca (0
Uf) 0)
(In an In LO NU, In C)
ZD NI ID ID iU iN El I
0
~2
-j
[j]
(0 04
-I1I 00 I'Q N
2 4
6 8
Distance in Motors Map F8260202-14, Turbine Building (+) 0' El.
Grade Level Structural Steel Framing - Vertical Beams Beta Scan Measurements F8260202M0500BS to F8260202M0571BS Total Scan Area: 138.1 sq. meters
2 3
4 5
6 7
8 9
10 11 12 13 00 00 CN C)
ZN C1 CN U
No ED f
-0 1
11 ---
23'4" 17'0" 20' 4" 18'4" 18' 10.5" 18' 10.5" I
4 23' 4" 23' 4" 23' 4" 16' 11" N
2 4
6 8
Distance in Meters Map F8260202-15, Turbine Building (+) 39'2" El.
Turbine Deck Structural Steel Framing Direct Beta Measurements F8260202M0001 BD to F8260202M0003BD and Alternate 3
2 3
4 6
7 8
9 10 11 12 13 8
9 10 11 12 13 (D
00 C-)
23'4" 17'0' 20'4" 18'4" 18' 10.5" 18'10.5" 18'4" 23'4" 23'4"
. 23' 4" 16'11" 00 C)
C) k)
N 0
2 4
6 8
Distance in Meters Map F8260202-16, Turbine Building (+) 19' 10 3/4" El.
Mezzanine Floor Structural Steel Framing Direct Beta Measurements F8260202M0004BD to F8260202M0013BD and Alternate 2
00 00 00 00 o)
U U
Map F8260202-17, Turbine Building (+) 0' El.
Grade Level Structural Steel Framing - Vertical I-Beams Beta Direct Measurements F8260202M0014BD and Alternate 1 N
0 2
4 6
8 Oistanýe in~ Maimr Instrumentation July.16, 2008 Survey Unit F8260202
Table 2-1. Survey Unit Instrumentation Instrument Detector MDC Static MDC Scan Model; Serial No.
Model; Serial No.
(dpm/100 cm 2 )
(dpm/100 cm 2 )
M2350; 203486 43-68B; 190476 257 612 M2350; 193700 43-68B; 190294 257 612 M2350; 149789 43-68B; 161415 257 612 M2350; 203486 43-68B; 161400 257 612 M2350; 175834 43-68B; 148634 257 612 M2350; 149789 43-68B; 148633 257 612 5.88 dpm a,.
Tennelec; 0401171 N/A 11.71 dpm3 PN/A Table 2-2. Investigation Criteria and DCGL Value Param eter V l eC 2
(dpm/100 cm 2)
Investigation Criteria - Direct 21,500 Investigation Criteria - Scan 43,000 DCGLW 43,000 DCGLEMC N/A Page 2 of 2 Att. 2 Instrumentation F8260202 Investigation July 16, 2008 Survey Unit F8260202 (none required)
Data Assessment July 16, 2008 Survey Unit F8260202
ct~
0 Vl)
CD) 00 C)0 F8260202 Gross Activity Sample Results Quantile Plot DCGL = 43000 dpm/1 00cm 2 Z,
2,000 1,800 1,600 1,400 1,200 1,000 800 600 400 200 0
526
-I 0
20 40 60 Percentile 80 100 I
- Direct Measurements (dpm/100cm2)
-median
. -75th Percentile.
50th Percentile
CD 0
4-I F8260202 Gross Activity Sample Results Scatter Plot DCGL = 43000 dpmi00icm=
04 U)
(V Cl)
N-4 to 00 0
0 2000 E 1500 1000 500 4600
- to.a a M w w a w a f
-M a a a a at j 158 0
0 0
o 0
0 0
851
-28B5 r
B 0N
- 11) 0 CC 0
0 a
IN
- 0) t o
a o
C 0
0 a
0 0
T-V-
r a
0 a
a a
C 0
a a
0 0
a a
0 0
a a
0 0
0 a
a a
0 0
0 a
0 2M22 t2o222 222 2
2e Measurement Locations LOG r--Ioss ACtvty verage -
"+3St ev t
-3s evj
-e cf~
(t~
0 cj~
CA (t~
CA F8260202 Gross Activity Frequency Plot DCGL = 43000 dpm/1 00cm2 8
7 6
C0 5
4-3-
2-1 0
00 C) tQ Bins - Upper End Value (dpm/1 00cm2)