ML082620148

East DHR Pump Drain Sump Room, Survey Unit F8130071

ML082620148
Person / Time
Site:	Rancho Seco
Issue date:	06/11/2008
From:	Tallman D Sacramento Municipal Utility District (SMUD)
To:	NRC/FSME
References
MPC&D 08-064
Download: ML082620148 (33)

Text

Rancho Seco Final Status Survey Summary Report June 11,2008 East DHR Pump Drain Sump Room Survey Unit F8130071 Prepared By: Dan A. Tallman Date: June 12, 2008 FSS Engine r Reviewed By:

Date: __l__O__

Lead FSS Engineer Approved By:

(

ý7 4; Date:

7 Dismantlement Superintendent, Radiological

FINAL STATUS SURVEY

SUMMARY

REPORT Survey Unit:

F8130071, East DHR Pump Drain Sump Room 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/l100 cm2 and a maximum value of 5,720,000 dpm/100 cm 2. Based on the classification procedure (DSIP-0020) and levels of gross activity reported, Survey Unit 813007 within 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 1. Direct nieasurement locations were determined using a random-start, fixed grid pattern and 208 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 8 FSS Summary Report 178130071

Table 1. Survey Unit Design Parameters Survey Design Value I

Comment Parameter Survey Area:

F813 East DHR Pump Drain Sump Room Structure Surface LTP Table 5-4 Survey Unit:

Class:

SU Area (m2):

Evaluator:

DCGL (dpm/100 cm 2):

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 (in2):

Scan Coverage (%):

ZIg Sign P:

Calculated Relative Shift:

Relative Shift Used:

N-Value:

Design N-Value + 20%:

Design Min Samples N:

Grid Spacing L:

0071 1

208 D.A.Tallman 43000 3.6 154,800 21500 9976 0.05 0.05 Cs-137 6.9 208 100%

1.645 1.645 0.97725 2.1 2.1 12 15 30 2.6 Gross Activity DCGL Class 1 Class 1 Default = 50% DCGL Class 1 Class 1 Uses 3.0 if Relative Shift is

>3 NUREG-1575 Table 5-5 Class 1 Class 1 Page 3 of 8 FSS Summary Report F8130.071

Survey Results:

A total of 33 direct measurements were made in F8130071. The results including mean, median, standard deviation and range are shown in Table 2. All direct measurements were less than the DCGL. Multiple scan measurements indicated areas of elevated activity. Scan activity ranged from 1482 to 458279 dpm/100 cm2, 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/100 cm F8130071-CO001BD F8130071-CO002BD F8130071-CO003BD F8130071-CO004BD F8130071-COOO5BD F8130071-C0006BD F8130071-CO007BD F8130071-CO008BD F8130071-CO009BD F8130071-Co01OBD F8130071-CO011BD F8130071-CO012BD F8130071-Co013BD F8130071-CO014BD F8130071-CO015BD F8130071-CO016BD F8130071 -CO01 7BD F8130071-CO018BD F8130071-CO019BD F8130071-CO02OBD F8130071 -C0021 BD F8130071 -C0022BD F8130071-C0023BD F8130071-CO024BD F8130071-CO025BD F8130071-CO026BD F8130071-CO027BD F8130071-C0028BD F8130071-CO029BD F8130071 -CO03OBD F8130071-C0031BD F8130071-CO032BD F8130071-CO033BD Mean:

Median:

Standard Deviation:

Range:

2677 3107 1665 1997 1530 1546 1769 1982 1800 1800 4881 1774 1738 1696 3216 1629 1722 1629 2889 1504 1587 1494 5275 1572 1681 1644 5405 2397 1857 1919 1613 1587 1551 2186

.1738 1067 1494 -5405 Page 4 of 8 FSS Summary Report F8130071

Table 3. Removable Surface Activity Results Measurement ID Surface Beta Activity (dpmll00 cm2)

F8130071COOOISM F8130071 C0002SM F8130071 C0003SM F8130071 C0004SM F8130071 COOO5SM F8130071 C0006SM F8130071CO007SM F8130071 C0008SM F8130071 C0009SM F8130071Co010SM F8130071C0011SM F8130071Co012SM F8130071Co013SM F8130071CO014SM F8130071Co015SM F8130071CO016SM F8130071C0017SM F8130071Co018SM F8130071Co019SM F8130071CO020SM F8130071 C0021 SM F8130071 C0022SM F8130071 C0023SM F8130071 C0024SM F8130071 C0025SM F8130071C0026SM F8130071 C0027SM F8130071 C0028SM F8130071 C0029SM F8130071CO030SM F8130071 C0031 SM F8130071C0032SM F8130071 C0033SM Mean:

Median:

Standard Deviation:

Range:

-2.24

-0.95

-2.24 1.64 19.72 18.42 0.34 6.8 8.09 21.01 630.57 2.93 15.84 4.22 5.51 11.97 48.13 4.22 8.09 2.93 9.38 9.38 84.29

-2.24 11.97 9.38 30.05 103.66 8.09 1.64 1.64 10.68

-2.24 32.75 8.09 109.79

-2.24 to 630.57 Page 5 of 8 FSS Summary Report F8130071

Survey Unit Data Assessment:

The survey design required 33 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 F8130071

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):

33 Median (dpm/I oo cm2):

1738 Mean (dpm/100 cm 2):

2186 Direct Measurement Standard Deviation 1067 (dpm/100 cm 2):

Total Standard Deviation (dpm/100 cm 2):

1067 Based on samples and backgrounds.

Maximum (dpm/100 cm 2):

5405 Material Type:

N/A Background Subtract Not Applied Sign Test Final N Value:

33 S+ Value:

33 Critical Value:

21 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 7 of 8 FSS Summary Report F8130071

Survey Unit Investigations and Results:

Thirteen (13) investigations (scan grids 07, 15, 25, 26, 33, 41, 152, 160, 164, juncture scans 01, 04, 07, and penetration scan 03) were required for the scan measurements and the results are reported in Attachment 3. 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. Several potential areas of elevated 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 investigations required were preformed and reported demonstrating the compliance with the acceptance criteria.

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 F8130071 meets the release criteria of 10CFR20.1402.

Page 8 of 8 FSS Summary Report F8130071 Maps June 11, 2008 Survey Unit F8130071

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

Model; Serial No.

(dpm/100 cm2 )

(dpm/100 cm2 )

M2350; 180733 43-98B; 148638 8 2 0 A 1490A M2350; 175834 43-68B; 190482 M2350; 193700 43-68B; 160691 433 B 1033' M2350; 175834 43-68B; 148634 M2350; 193700 43-116-1B; 216072 796B 3258 172)C 1930 c M2350; 175834 43-116-IB; 190642 491 D 739D Tennelec; 0401171 N/A 6 dpm a, 12 dpm3 N/A A

B C

D Penetration - 4" - metal Surface scan - concrete Penetration 14" - metal Juncture - concrete Table 2-2. Investigation Criteria and DCGL Parameter Value (dpmll00 cm2)

Investigation Criteria - Direct 430001 Investigation Criteria-Scan 43000 A DCGLW 43000 DCGLEMC 154800 A Investigation Level set conservatively at the DCGLw within the survey instructions.

Page 2 of 2 Att. 2 Instrumentation F8130071 Investigation June 11, 2008 Survey Unit F8130071

Table 3-1 Survey Unit Investigation InvstgatonInvestigation DCGLemc Investigation Initial Value Investigation Elevated Area DnCGLemc Result Unity Grid Level Result Area (2)

Factor (cpm)

(cpm)

(cpm)

(dpm/l OOcm 2)

Fraction COOOIJS 1 9 9 0 A 2458 2458 0.026 433.6 18644800 53111 0.003 C0004JS 1990A 2811 2669 1 0.026 433.6 18644800 57671 0.003 C0005JS 1990A 2446 599 1 NA NA NA 12943 NA C0007BS 5840 11572 29451 NA NA NA 21604 NA C0015BS 1990 6772 1207 1,2 NA NA NA 8854 NA C0025BS 5840 6245 2672 1 NA NA NA 19602 NA C0026BS 5840 9119 1598 1 NA NA NA 11723 NA C0033BS 5840 9014 3754 1 NA NA NA 27539 NA C0041BS 5840 16059 1855 1 NA NA NA 13608 NA C0152BS 5840 11451 2939 1 NA NA NA 21560 NA C0160BS 5840 10640 1697 1 NA NA NA 12449 NA C0164BS 5840 7478 3619 1 NA NA NA 26549 NA P03 (metal) 3360 35824 10651-1 0.195 68.6 2948510 136253 0.045 Comments:

A Investigation Level set at surface scan Cs-1 37 value due to monitoring technique and geometry of remediated juncture 1 Post remediation survey results 2 Post remediation survey performed with 43-68B due to monitoring technique and geometry of remediated juncture DCGL =

SU Mean =

0.051 Survey Unit Remainder 43,000 2186 EMC-Unity Sum 0.102 Page 2 of 2 Att. 3 Investigation F8130071 Data Assessment June 11, 2008 Survey Unit F8130071

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