ML090980384

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Final Status Survey Summary Report for November 6, 2008 East Decay Heat Removal Pump Room - Upper Walls Survey Unit F8130041
ML090980384
Person / Time
Site: Rancho Seco
Issue date: 11/19/2008
From: Tallman D
Sacramento Municipal Utility District (SMUD)
To:
NRC/FSME
Shared Package
ML090830613 List: ... further results
References
DPG 09-097
Download: ML090980384 (40)
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Rancho Seco Final Status Survey Summary Report November 6, 2008 East Decay Heat Removal Pump Room - Upper Walls Survey Unit F8130041 Prepared By: Dan A. Tallman Date: November 19, 2008 FSS Egne Reviewed By:__ Date:. It7 16(q9 Lead FSS gineer Approved By: ;777 Date: c9o-Dismantlement Superintendent, Radiological

FINAL STATUS SURVEY

SUMMARY

REPORT Survey Unit:

F8130041, East Decay Heat Removal Pump Room - Upper Walls 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 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 on the -47' elevation showed a mean gross activity level of 320,071 dpm/ 100 cm 2 and a maximum value of 5,720,000 dpm/lO00 cm. Based on the classification procedure (DSIP-0020) and levels of gross activity reported, the upper walls of the East Decay Heat Removal Pump Room within the interior of the auxiliary building were determined to be a Class I 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 1. Direct measurement locations were determined using a random-start, fixed grid pattern and 239.5 m 2 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 10 FSS Summary Report F8130041

Table 1. Survey Unit Design Parameters Survey Design Value Comment Parameter Survey Area: F813 East Decay Heat Removal Pump Room - Upper Walls Survey Unit: 0041 Structure Surface Class: 1 LTP Table 5-4 SU Area (m2): 239.5 Evaluator: D.A.Tallman DCGL (dpm/100 cm 2): 43000 Gross Activity DCGL Area Factor: 3.5 Class 1 Design DCGLemc 152220 Class 1 (dpm/100 cm 2 ):

LBGR (dpm/100 cm 2 ): 21500 Default = 50% DCGL 2

Design Sigma (dpm/100 cm ): 9976 Type I Error: 0.05 Type II Error: 0.05 Predominant Nuclide: Cs-137 Sample Area (m2): 6.84 Class 1 2 239.5 Scan Area (m ):

Scan Coverage (%): 100% Class 1 Zl1,  :

1.645 ZJ-P : 1.645 Sign P: 0.97725 Calculated Relative Shift: 2.1 Relative Shift Used: 2.1 Uses 3.0 if Relative Shift is

>3 N-Value: 12 Design N-Value + 20%: 15 NUREG-1575 Table 5-5 Design Min Samples N: 35 Class 1 Grid Spacing L: 2.6 Class 1 Page 3 of 10 FSS Summary Report F8130041

Survey Results:

A total of 48 direct measurements were made in F8130041. The results including mean, median, standard deviation and range are shown in Table 2. All direct measurements were less than the DCGL. One of the scan measurements indicated areas of elevated activity. Scan activity ranged from 593 to 1356927 dpm/100 cm2 , based on a surveyor efficiency of 0.5 and no background subtracted. Samplesfor 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/100 cm F8130041-CO001BD 1369 F8130041-C0002BD 934 F8130041-C0003BD 1515 F8130041-C0004BD 1468 F8130041-C0005BD 1318 F8130041-C0006BD 1421 F8130041-C0007BD 1250 F8130041 -CO008BD 1328 F8130041-CO009BD 1323 F8130041-CO01OBD 1312 F8130041-COOIIBD 1395 F8130041-CO012BD 1484 F8130041-CO013BD 1468 F8130041-CO014BD 1691 F8130041-CO015BD 1447 F8130041-CO016BD 1670 F8130041-C0017BD 1478 F8130041-CO018BD 1406 F8130041-CO019BD 1546 F8130041 -CO02OBD 1520 F8130041-C0021BD 1598 F8130041-CO022BD 1665 F8130041-CO023BD 1748 F8130041-C0024BD 788 F8130041-CO025BD 1515 F8130041 -CO026BD 1385 F8130041-C0027BD 1385 F8130041-CO028BD 1437 F8130041 -CO029BD 1494 F8130041-CO03OBD 1235 F8130041-C0031BD 1950 F8130041-C0032BD 1629 F8130041-CO033BD 1292 F8130041-CO034BD 2267 F8130041-CO035BD 1452 F8130041-CO036BD 1349 Page 4 of 10 FSS Summary Report F8130041

F8130041-CO037BD 1426 F8130041-CO038BD 1411 F8130041-CO039BD 1406 F8130041-CO04OBD 1276 F8130041-CO041BD 1421 F8130041-CO042BD 1328 F8130041-CO043BD 1473 F8130041-CO044BD 1530 F8130041-CO045BD 1572 F8130041-CO046BD 1359 F8130041-CO047BD 1650 F8130041-CO048BD 1318 Mean: 1452 Median: 1432 Standard Deviation: 221 Range: 788-2267 Page 5 of 10 FSS Summary Report F8130041

Table 3. Removable Surface Activity Results Measurement ID Surface Beta Activity (dpm/100 cm 2 )

F8130041COOOISM 10.68 F8130041C0002SM 17.13 F8130041C0003SM 5.51 F8130041 C0004SM 4.22 F8130041C0005SM 10.68 F8130041C0006SM 6.8 F8130041 C0007SM -0.95 F8130041 C0008SM 9.38 F8130041 C0009SM 42.96 F8130041CO010SM -0.95 F8130041CO01ISM 1.64 F8130041C0012SM 13.26 F8130041Co013SM 1.64 F8130041CO014SM 15.84 F8130041CO015SM 8.09 F8130041CO016SM -4.82 F8130041CO017SM 13.26 F8130041CO018SM 1.64 F8130041C0019SM -3.53 F8130041 CO020SM 2.93 F8130041C0021SM 6.8 F8130041C0022SM 1.64 F8130041C0023SM 0.34 F8130041C0024SM -3.53 F8130041 C0025SM -0.95 F8130041C0026SM 8.09 F8130041C0027SM -3.53 F8130041CO028SM 4.22 F8130041 CO029SM 2.93 F8130041C0030SM 1.64 F8130041CO03ISM 4.22 F8130041C0032SM 13.26 F8130041 CO033SM -2.24 F8130041C0034SM 13.26 F8130041C0035SM 6.8 F8130041C0036SM 4.22 F8130041C0037SM 1.64 F8130041C0038SM -0.95 F8130041C0039SM 10.68 F8130041C0040SM 6.8 F8130041CO041SM 4.22 F8130041 C0042SM 0.34 F8130041C0043SM 1.64 F8130041 C0044SM -0.95 F8130041C0045SM -0.95 F8130041C0046SM 1.64 F8130041C0047SM 0.34 F8130041C0048SM 2:93 Page 6 of 10 FSS Summary Report F8130041

Mean: 5 Median: 2.93 Standard Deviation: 7.82 Range: -4.82 to 42.96 Page 7 of 10 FSS Summary Report F8130041

Survey Unit Data Assessment:

The survey design required 48 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 8 of 10 FSS Summary Report F8130041

Table 4. Data Assessment Results Survey Results Parameter Value Comment Material Background Used (dpm/100 cm 2): N/A Ambient Background Used (dprn/100 cm2): N/A Average Ambient BKG = 0 Actual Direct Measurements (N): 48 Median (dpm/100 cm 2 ): 1432 Mean (dpm/100 cm 2 ): 1452 Direct Measurement Standard Deviation 221 (dpm/100 cm 2):

Total Standard Deviation (dpm/100 cm 2): 221 Based on samples and backgrounds.

Maximum (dpm/100 cm 2): 2267 Material Type. N/A Background Subtract Not Applied Sign Test Final N Value: 48 S+ Value: 48 Critical Value: 30 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 9 of 10 FSS Summary Report F8130041

Survey Unit Investigations and Results:

One investigation was required for the scan measurements and the results are reported in . The discrete area, within scan grid 53, consisted of the lower lip area of the Decay Heat Removal pipe near its interface with the concrete support as it exited the wall plane. This feature is identified as the DHLIPAREA within the survey unit documentation. The EMC unity rule was not exceeded as shown in 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 the sample results are consistent with that classification. The variability of the survey results was less than the characterization data used for survey design. One potential area of elevated activity was 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 cm2 and none of the removable surface activity measurements exceeded 10% of the DCGL. The required investigations were performed and evaluated.

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 F8130041 meets the release criteria of 10CFR20.1402.

Page 10 of 10 FSS Summary Report F8130041

Attachment 1 Maps November 6, 2008 Survey Unit F8130041

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Attachment 2 Instrumentation November 6, 2008 Survey Unit F8130041

Table 2-1. Survey Unit Instrumentation Instrument Detector MDC Static MDC Scan Model; Serial No. Model; Serial No. (dpm/100 cm') (dpm/100 cm 2 )

590A 1070A7 M2350; 180733 43-98B; 148638 930B 1680B 1400c 2520c M2350; 180733 43-94; 148620 350') 61 D M2350; 149794 43-68/5B; 149103 433 E 1033 E M2350; 142509 43-51B; 190667 132 4 F 4494 F M2350; 180738 43-51B; 190666 990 M2350; 149794 43-116-1B; 256005 796" 3258H 491' 739' M2350; 203486 43-116-IB; 190173 796' 3258' Tennelec; 0401171 N/A 6 dpmaa, 12 dpm3 N/A A 43-98B; - penetration - concrete - 2" F 43-51 B; - surface scan - concrete 43-98B; - penetration - concrete - 3" c 43-5 I B; -juncture scan - concrete 43-98B; - penetration - concrete - 4" H 43-116B; - surface scan - concrete 43-94B; - penetration - concrete- 1'

'-r '43-116B; -juncture scan - concrete E 43-68B; - surface scan - concrete 43-116B; - penetration - concrete -4"-14" Table 2-2. Investigation Criteria and DCGL Value Parameter (dpmnlOO cm 2 )

Investigation Criteria -,Direct 43,000

  • Investigation Criteria - Scan 43,000
  • DCGLw 43000 DCGLEMC 154507 Investigation levels set conservatively at the DCGLw See table below for instrument/media specific cpm values.43-98B; penetration 2"- concrete, scan -3180 43-51B; surface scan - concrete scan -9900, 8

2 43-98B; penetration 3"- concrete, scan -2020 43-51B; juncture scan - concrete, scan -15200 343-98B; penetration 4"- concrete scan -1350 '_43-116B; surface scan - concrete, scan -1990 40 43-116B;juncture scan - concrete, S43-94B; penetration 1"- concrete, scan -32S0 scan - 4260 43-68B; surface scan - concrete, scan -5840 '1 43-116B; penetration - concrete - 4"-14' 6 43-68B; surface - concrete, direct - 8260 scan - 1990 Page 2 of 2 Att. 2 Instrumentation F8130041

Attachment 3 Investigation November 6, 2008 Survey Unit F8130041

Table 3-1 Survey Unit Investigation InvstgatonInvestigation DCGLe,,c Grid Investigation Initial Value Result Elevated Area DCGLemc Result Unity Level (cpm) (cpm) (cpm) Area (i 2) Factor (dpm/lOOcm2) Fraction DHLIPAREA 9900 22668 6201 NA NA NA < DCGLw NA DHLIPAREA - Decay Heat Lip Area - during survey of grid 0053, difficulty was experienced due to the magnitude of the surface irregularities resulting from the substantial remediation effort. One area of particular note was the area in the lower quadrant of the Decay Heat line which protruded from the remediated penetration pedestal. This lip area was investigated as a unique structural feature with the survey unit.

1Post remediation value.

Survey Unit Remainder Page 2 of 2 Att. 3 Investigation F8130041

Attachment 4 Data Assessment November 6, 2008 Survey Unit F8130041

F8130041 Gross Activity Sample Results Quantile Plot DCGL = 43000 dpm/1 00cm2 2,500- i 2,000 1,500 1432

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0" o F8130041 Gross Activity Sample Results Scatter Plot DCGL = 43000 dpmll001cn 2500 0

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(0 Bins - Upper End Value (dpm/1 00cm2)

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