ML090980385
| ML090980385 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 02/03/2009 |
| From: | Tallman D Sacramento Municipal Utility District (SMUD) |
| To: | NRC/FSME |
| Shared Package | |
| ML090830613 | List:
|
| References | |
| DPG 09-097 | |
| Download: ML090980385 (28) | |
Text
Rancho Seco Final Status Survey Summary Report Revision I February 3, 2009 AB -20' corridor column R-T Survey Unit F8130161 Prepared By: Dan A. Tallman _______Date: February 3, 2009 FSS Engineer Reviewed By: I.*L *1 *LI Date: 7-*1\ 0e 1 Lead FSS Engineer Approved By:_ Date:-
Dismantlement Supe'riintendent, Radiological
FINAL STATUS SURVEY
SUMMARY
RE:PORT Survey Unit:
F8130161, AB -20' corridor column R-T Survey Unit
Description:
Operating History: The Auxiliary Building is a reinforced concrete structure that contained the RadWaste processing and supporting systems. The building contained six 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 cf the interior elevation surfaces as well as the exterior surfaces of the structure. These measurements confirmed the presence of plant-derived radionuclides. The direct measurements on the -20' elevation showed a mean gross activity level of 247,831 dpm/100 cm 2 and a maximum value of 10,080,000 dpm/100 cm 2 . Based on the classification procedure (DSIP-0020) and levels of gross activity reported, the main east - west corridor between columns R and T in the -20' elevation of the interior of the auxiliary building was determined to be a Class 1 area.
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 Direct measurement locations were determined using a random-start, fixed grid pattern and 310.1 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 9 FSS Summary Report F8130161
Table 1. Survey Unit Design Parameters Survey Design Value Comment Parameter Survey Area: F813 AB -20' corridor column R-T Survey Unit: 0161 Structure Surface Class: 1 LTP Table 5-4 SU Area (mZ): 310.1 Evaluator: D.A.Tallman DCGL (dpm/100 cm 2 ): 43000 Gross Activity DCGL Area Factor: 3.58 Class 1 Design DCGLemc 153867 Class 1 (dpm/100 cm2 ):
LBGR (dpm/100 cm 2): 21500 Default = 50% DCGL Design Sigma (dpm/100 cm 2): 12035 Type I Error: ,0.05 Type II Error: 0.05 Predominant Nuclide: Cs-137 Sample Area (m2): 6.89 Class 1 Scan Area 2 (M ): 310.1 Scan Coverage (%): 100% Class 1 1.645 1.645 Sign P: 0.955435 Calculated Relative Shift: 1.7 Relative Shift Used: 1.7 U:ses 3.0 if Relative Shift is
>3 N-Value: 14 Design N-Value + 20%: 17 NUREG-1575 Table 5-5 Design Min Samples N: 45 Class 1 Grid Spacing L: 2.6 Class 1 Page 3 of 9 FSS Summary Report F8130161
Survey Results:
A total of 47 direct measurements were made in F8130161. The results including mean, median, standard deviation and range are shown in Table 2. All direct measurements were less than the DCGL. No FSS measurements indicated areas of elevated activity.
Scan activity ranged from 1482 to 54498 dpm/100 cm 2 , based on a surveyor efficiency of 0.5 and no background subtracted. ISOCS scan activity on the walls and ceiling ranged from 1116 to 12,300 dpm/1OOcm 2 for Cs-137 with all scans MDA for Co-60. 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 F8130161
Table 2. Direct Measurement Results
- 1*
Measurement ID Gross Activity (dpm/100 cm)
F8130161-CO001BD 1717 F8130161-CO002BD 1712 F8130161-CO003BD 1696 F8130161-CO004BD 1826 F8130161-CO005BD 1790 F8130161-CO006BD 1504 F8130161 -CO007BD 1624 F8130161 -COOOBBD 1592 F8130161-CO009BD 1535 F8130161-CO01OBD 3035 F8130161-CO011BD 3916 F8130161-CO012BD 2443 F8130161-CO013BD 2511 F8130161-CO014BD 2832 F8130161-CO015BD 5239 F8130161-CO016BD 1899 F8130161-CO017BD 1914 F8130161-CO018BD 2163 F8130161-CO019BD 2116 F8130161-CO02OBD 1515 F8130161-CO021BD 1369 F8130161-CO022BD 1639 F8130161-CO023BD 1411 F8130161-CO024BD 1608 F8130161-CO025BD 1629 F8130161-CO026BD 1530 F8130161-CO027BD 1286 F8130161-CO028BD 1442 F8130161-CO029BD 1572 F8130161-CO03OBD 1390 F8130161-CO031BD 1660 F8130161-CO032BD 1499 F8130161-CO033BD 1421 F8130161-CO034BD 1489 F8130161-CO035BD 1375 F8130161-CO036BD 1390 F8130161-CO037BD 1733 F8130161-C0038BD 1644 F8130161-C0039BD 1520 F8130161-CO04OBD 1541 F8130161-CO041BD 1582 F8130161-C0042BD 1432 F8130161-C0043BD 1598 F8130161-C0044BD 1561 F8130161-C0045BD 1468 F8130161-CO046BD 1577 F8130161-CO047BD 1551 Mean: 1819 Median: 1592 Standard Deviation: 705 Ranqe: 1286 - 5239 Page 5 of 9 FSS Summary Report F8130161
Table 3. Removable Surface Activity Results Measurement ID Surface Beta Activity (dpmllO0 cm 2 )
F8130161 C0001SM -0.95 F8130161 C0002SM -3.53 F8130161 C0003SM -2.24 F8130161 C0004SM -0.95 F8130161 C0005SM 0.34 F8130161 C0006SM -2.24 F8130161 C0007SM -2.24 F8130161 C0008SM -0.95 F8130161 C0009SM -3.53 F8130161 Co010SM 0.34 F8130161CO01ISM 2.93 F8130161 Co012SM 2.93 F8130161 Co013SM 2.93 F8130161CO014SM 1.64 F8130161C0015SM -0.95 F8130161 Co016SM 5.51 F8130161 CO017SM 17.13 F8130161CO018SM 1.64 F8130161CO019SM -2.24 F8130161CO020SM 17.13 F8130161 C0021 SM -4.82 F8130161 CO022SM 5.51 F8130161 C0023SM -3.53 F8130161 C0024SM 15.84 F8130161 C0025SM 2.93 F8130161C0026SM -2.24 F8130161 C0027SM -3.53 F8130161 C0028SM -3.53 F8130161C0029SM -3.53 F8130161CO030SM -2.24 F8130161C0031SM 4.22 F8130161 C0032SM 0.34 F8130161 C0033SM 1.64 F8130161 C0034SM 8.09 F8130161 CO035SM -0.95 F8130161 C0036SM -2.24 F8130161C0037SM 19.72 F8130161 C0038SM 4.22 F8130161 C0039SM 11.97 F8130161 C0040SM 0.34 F8130161CO041SM 24.88 F8130161 C0042SM 1.64 F8130161 C0043SM 13.26 F8130161 C0044SM 0.34 F8130161CO045SM 15.84 F8130161 C0046SM 1.64 F8130161 C0047SM 13.26 Mean: 3.23 Median: 0.34 Standard Deviation: 7.3 Range: -4.32 to 24.88 Page 6 of 9 FSS Summary Report F8130161
Survey Unit Data Assessment:
The survey design required 47 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 7 of 9 FSS Summary Report F8130161
Table 4. Data Assessment Results Survey Results Parameter Value Comment Material 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): 47 2
Median (dpm/100 cm ): 1592 Mean (dpm/100 cm 2 ): 1819 Direct Measurement Standard Deviation 705 (dpm/100 cm 2):
Total Standard Deviation (dpm/100 cm 2): 705 Based on samples and backgrounds.
Maximum (dpm/100 cm 2): 5239 Material Type: N/A Background Subtract Not Applied Sign Test Final N Value: 47 S+ Value: 47 Critical Value: 29 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 8 of 9 FSS Summary Report F8130161
Survey Unit Investigations and Results:
No investigations were required based on the results of the FSS performed within this survey unit.
During routine surveillance surveys utilizing the 44-10 Nal detector, discovery was made in grids 24/25, 26/27, 32/33, 34/35, & 40/41. The results of this discovery are detailed in attachment 3. The EMC unity rule was not exceeded as shown in to Table 3-1.
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 1 structure survey and t:-e sample results are consistent with that classification. The variability of the survey results was less than the characterization data used for survey design. Potential areas of elievated 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 43000 dpm/100 cm 2 and none of the removable surface activity measurements exceeded 10% of the DCGL. The required investigations were performed.
The direct measurement data support rejection of the null hypothesis, providing high confidence that the survey unit satisfied the release criteria and t" at the data quality objectives were met.
It is concluded that survey unit F8130161 meets the release criteria of 10CFR20.1402.
Page 9 of 9 FSS Summary Report F8130161
Attachment 1 Maps June 17, 2008 Survey Unit F8130161
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Scale Meters ROOM 15 BETWEEN COLS. 1R"& "T" Floor- 51.7 m 2
- SMUDSACRAMENTO MUNICIPAL SURFACE AREA ESTIMATE 2
0 1 2 3 4 5 UTILITY DISTRICT F8130161 -M1 Total - 310.1 m
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Attachment 2 Instrumentation June 17, 2008 Survey Unit F8130161
Table 2-1. Survey Unit Instrumentation Instrument Detector MDC Stati4: MDC Scan Model; Serial No. Model; Serial No. (dpm/100 cirn2 ) (dpm/100 cm 2)
M2350; 180733 43-98B; 148638 3 50 A 630 A M2350;. 175834 43-68B; 190482 M2350; 203486 43-68B; 190476 M2350; 193700 43-68B; 190294 433 B 1033 B M2350; 149789 43-68B; 161397 M2350; 142509 43-68B; 160699 M2350; 180738 43-68/5B; 148942 M2350; 180738 43-116-1B; 216073 796 B 3258B M2350; 175834 43-116-IB; 190642 7 96 c 3258 C 43-116-1B; 190173 491,D 7 39D M2350; 203486 M2350; 203482 44-10; 211672 NA 16756 Tennelec; 0401171 N/A 6 dpm cx, 12 dpr 3 N/A A Penetration -- 2" - metal 13 Structure - surface - concrete c Penetration - 4" to 14" - Concrete D Juncture - concrete Instrument Detector MDC Model; Serial No. Model; Serial No. (di:,m/100 cm2 )
_____ 1983920 1030 (Co60)
ISOCS 1983920 1420 (Cs 137) 3920_2m-concrete geometry 12.5 m 2 FOV Table 2-2. Investigation Criteria and EICGL Parameter ( mValue~ IO CM)
(dpm/10*Jcm2 Investigation Criteria - Direct 15386W Investigation Criteria - Scan' 15386 DCGLw 43000 DCGLEMc 153867 Scan Investigation Level for routine 44-10 surveillance scan set at 20,000 cpm (- 60%
DCGLEMC 0.75 m2)
Value (c0pm/1OO cm")
Instrument Parameter To detect a I m hot spot at the EMC Criterion within the detector field of view 1 Investigation Criteria -
Concrete Scan 1 21,275 dprn/100 63,300 2
cm Cs-137 dpni/100 cm 2 Co-60 3920_2m-concrete geometry 12.5 M 2 FOV Page 2 of 2 Att. 2 Instrumentation F8130161
Attachment 3 Investigation REVISION 1 February 3, 2009 Survey Unit F8130161
Table 3-1 Survey Unit Investigation Investigation Initial Value Investigation Elevated Area Inv estigation DCGLun Gridn Levesai Initial Value Result Area (m 2) Factor D Lec Result Unity Level (cpm) (cpm) (cpm) (dpm/lOOcm2) Fraction C24/25GS 20000 T 32000 4000 I 0.33** 41.48 1 1,783,640 155,255 0.086 C26/27GS 20000 1 82000 12000 0.01 1294.1 55,646,300 465,766 0.008 C26/27GS 20000 1 35000 8000 0.78*
- 18.70 804,100 310,511 0.384 C32/33GS -F 20000 [ 52000 1 4000 1 0.50*
- 28.10 ]1,208,300 ] 155,255 0.127 C32/33GS 1 20000 [ 49000 1 4000 1 0.50** 1 28.10 1,208,300 155,255 0.127 C34/35GS C24/25BS 20000 N/A
[ 29000 N/A J 1 4000 1379 0.26**
0.33**
51.86 41.48 2,229,980 1,783,640 155,255 10,116 0.069 0.00472 N/A N/A 2488 0.78** 18.70 804,100 18,252 0.020 2 C26/27BS N/A N/A 1470 1.0"* 14.9 640,700 10,784 0.014 2 C32/33BS N/A N/A 1507 0.26** 51.86 2,229,980 11,055 0.004 2 C34/35BS C40/41BS N/A N/A 1511 1.0'* 14.9 640,700 11,085 0.015 2 N/A N/A 2014 0.1* 131.6 5,658,800 45,812 3 0.008 2 Juncture G25 N/A N/A 1624 0.1* 131.6 5,658,800 36,941 0.006 2 Juncture G26 N/A N/A 2175_ 0.1" 131.6 5,658,800 49,475 _ _0.008 2
Juncture G33 Juncture G34 N/A N/A 976 0.1* 131.6 5,658,800 22,20147 0.0042 N/A N/A 552 0.1* 131.6 5,658,800 12,556 0.002 2 Juncture G41 Comments:
- Elevated juncture area estimated at 2" by one meter.
- Elevated area conservatively estimated at the surface area of the remediation foot print 1 Discovery made during routine surveillance with 44-10. Insufficient survey documentation available to distinguish exact FSS grid identification.
FSS arids correspondina to surveillance location are as indicated (includina the adiacent-iuncture).
2 Post remediation verification survey included beta scan survey measurements of grid and accompanying juncture area. (EMC Unity Fraction =
0.0857) As this evaluation duplicates the surface area of the 44-10 evaluation, it will not be added to the more conservative 44-10 EMC Unity Fraction value of 0.801.
3Juncture remediation resulted in a geometry most accurately conforming to that of the Csl 37 surface scan selected in the DQA.
Survey Unit Remainder DCGL = SU Mean= 0.042 43,000 1821 EMC Unity Sum 0.843 Page 2 of 2 Att. 3 Investigation F8130161
Attachment 4 Data Assessment June 17, 2008 Survey Unit F8130161
F81 30161 Gross Activity Sample Results Quantile Plot DCGL = 43000 dpm/100cm2 6,000 5,000 (D
4,000 I,
3,000 2,000 1592 1,000 -
0-0 20 40 60 80 100 Percentile 00 U1h F DirectMeasurements (dpm/100cm2) medlan - -75th Percentile .... 50th Percentile
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0 F8130161 Gross Activity Sample Results Scatter Plot DCGL = 43000 dpm/100cm=
6000 5000 0 0
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C 4000 39351 3000 0 0
C; 2000 181E CD) 00 00000 00 0 000.00 000000000 C,)
1000 0 -- - - -- - - -- - - - - -- -- - - - - - - - - - - . - - -. -287
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000000~w §0MMMM 0000000000000 00 0000 03 0000%0W000000N"000000 0 000 Measurement Locations 171 00 U)
I o Gross Activity - Average - - "+3StDev" - - "-3SIDerv"1
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F8130161 Gross Activity Frequency Plot DCGL = 43000 dpm/1 00cm2 45 42 39 36 c-) 33 30 C
0- 27 0L U-24 0
21 18 15 WV 00 12 9
6 3
0 SN Bins - Upper End Value (dpm/1 00cm2)