ML081610163

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Final Status Survey Summary Report, March 20, 2008, Flash Tank Room, Survey Unit F8130141
ML081610163
Person / Time
Site: Rancho Seco
Issue date: 03/20/2008
From: Tallman D
Sacramento Municipal Utility District (SMUD)
To:
NRC/FSME
References
F8130141
Download: ML081610163 (29)
v • d • e


Text

Rancho Seco Final Status Survey Summary Report March 20, 2008 Flash Tank Room Survey Unit F8130141 Prepared Reviewed Date: 3 Approved By_

Date:

-_o Dismantlement Superintendent, Radiological

FINAL STATUS SURVEY

SUMMARY

REPORT Survey Unit:

F8130141, Flash Tank Room Survey Unit

Description:

Operating History: The Auxiliary Building, a reinforced concrete structure, 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 -20' elevation showed a mean gross activity level of 247,831 dpm/100 cm2 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 interior of the auxiliary building -20' elevation 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 measurement locations were determined using a random-start, fixed grid pattern and 61.6 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 F8130141

Table 1. Survey Unit Design Parameters Survey Design Value Comment Parameter Survey Area:

Survey Unit:

Class:

SU Area (m2):

Evaluator:

DCGL (dpm/100 cm2):

Area Factor:

Design DCGLemc (dpm/100 cm 2):

LBGR (dpnV100 cm 2):

Design Sigma (dpm/100 cm 2):

Type I Error:

Type II Error:

Predominant Nuclide:

Sample Area (m2):

Scan Area (M-2):

Scan Coverage (%):

Sign P:

Calculated Relative Shift:

Relative Shift Used:

N-Value:

Design N-Value + 20%:

Design Min Samples N:

Grid Spacing L:

F813 0141 1

61.6 D.A.Tallman 43000 5.1 221058 21500 12035 0.05 0.05 Cs-137 3.85 61.6 100%

1.645 1.645 0.96407 1.8 1.8 13 16 16 1.9 Flash Tank Room Structure Surface LTP Table 5-4 Gross Activity DCGL Class I Class I 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 F8130141

J Survey Results:

A total of 16 direct measurements were made in F8130141. The results including mean, median, standard deviation and range are shown in Table 2. All direct measurements were less than the DCGL. Five scan measurements indicated areas of elevated activity.

Scan activity ranged from 1356 to 114477 dpm/100 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.

Table 2. Direct Measurement Results Measurement ID Gross Activity (dpm/100 cmy)

F8130141-COOOIBD 2915 F8130141 -CO002BD 1841 F8130141 -CO003BD 1556 F8130141 -CO004BD 1930 F8130141 -CO005BD 1608 F8130141 -CO006BD 2754 F8130141 -CO007BD 1836 F8130141 -COOO8BD 11365 F8130141 -CO009BD 2210 F8130141 -CO01OBD 5068 F8130141 -CO011 BD 2090 F8130141 -COOI2BD 2319 F8130141 -CO01 3BD 2215 F8130141-CO014BD 1551 F8130141-CO015BD 1323 F8130141-CO016BD 923 Mean:

2719 Median:

2010 Standard Deviation:

2486 Range:

923-11365 Page 4 of 8 FSS Summary Report F8130141

Table 3. Removable Surface Activity Results Measurement ID Surface Beta Activity (dpm/100 cm2)

F8130141 C0001SM FBI 30141 C0002SM F8130141CO003SM F8130141 C0004SM F8130141 C0005SM F8130141 C0006SM F8130141 C0007SM F8130141 C0008SM F8130141 C0009SM F8130141CO010SM F8130141CO011SM F8130141CO012SM F8130141 COOl 3SM F8130141 Co014SM F8130141 COO1 5SM F8130141COO16SM Mean:

Median:

Standard Deviation:

Range:

13.26

-2.24

-3.53

-2.24

-3.53 2.93 0.34 8.09

-2.24 5.51 0.34 6.8 13.26

-0.95

-2.24 0;34 2.12 0.34 5.64

-3.53 to 13.26 Page 5 of 8 FSS Summary Report F8130141

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 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 F8130141

Table 4. Data Assessment Results Survey Results Parameter Value Comment Material Background Used (dprrlO0 cm2):

N/A Ambient Background Used (dpm/100 cm 2):

N/A Average Ambient BKG = 0 Actual Direct Measurements (N):

16 Median (dpm/100 cm2):

2010 Mean (dpm/100 cm2):

2719 Direct Measurement Standard Deviation 2486 (dpm/100 cm 2):

Total Standard Deviation (dpm/100 cm 2):

2486 Based on samples and backgrounds.

Maximum (dpmr100 cm2 ):

11365 Material Type:

N/A Background Subtract Not Applied 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:

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.

F8130141

Survey Unit Investigations and Results:

Five investigations (scan grids 03, 05, 20, 21, & penetration scan P07) were required based on an Investigation Level set conservatively at the.DCGLw in the survey design for the' Beta 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 inlInitial 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. The potential areas of elevated activity were detected and evaluated as shown in Attachment 3 demonstrating that 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 investigations required were performed and evaluated as documented in Attachment 3.

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 F8130141 meets the release criteria of 10CFR20.1402.

Page 8 of 8 FSS Summary Report F8130141 Maps March 20, 2008 Survey Unit F8130141

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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 cm 2)

M2350; 180733 43-98B; 1486381 930 1680 M2350; 180733 43-98B; 1486382 350.

630 M2350; 180733 43-98B; 1486383 550 990 M2350; 180733 43-98B; 1486384 820 1490 M2350; 180733 43-94; 1486205 590 1030 M2350; 149789 43-68B; 161397 433 1033 M2350; 149789 43-116-1B; 256006 6 491 73.9 M2350; 149789 43-116-1B; 2560067 472 1930 M2350; 149789 43-116-IB; 2560068 796 3258 Tennelec; 0401171 N/A 5.88 dpm 11.71 dpm O, N/A Penetration - 3" -concrete 2 Penetration - 2" - metal 3 Penetration - 3" - metal 4 Penetration - 4" - metal 5 Penetration - 1" - concrete 6 Juncture - concrete 7 Structure/Penetration - 4"-14" - metal 8 Structure /Penetration - 4"- 14" - concrete

'Table 2-2. Investigation Criteria and DCGL Parameter Value (dpm/100 cm2)

Investigation Criteria - Direct 222282 Investigation Criteria - Scan 43000 A DCGLw 43000 DCGLEMC 222282 A Investigation Level set at DCGLw within the survey instruction.

Page 2 of 2 Att. 2 Instrumentation F8130141 Investigation March 20, 2008 Survey Unit F8130141

Table 3-1 Survey Unit Investigation Investigation Initial Value Investigation Elevated Area Investigation DCGLemc d

Level (cpm)

(CPM)

Area (mn) Factor DCGLemc Result Unity (cpm) I A

(dpm/lOOcm2)

Fraction Grid 03 5840 7111 5422 NA NA NA

< DCGLw 0

Grid 05 5840 11202 7172 NA NA NA

< DCGLw 0

Grid 20 5840 8665 3954 NA NA NA

< DCGLw 0

Grid 21 5840 15605 13322 0.06 218.25 9384924 69105 0.007 P07 1350 4430 1088 2 NA NA NA

< DCGLw 0

1 Beta Direct measurement 2 43-98B Survey Unit Remainder DCGL =

SU Mean =

0.063 43,000 2718 EMC Unity Sum 0.07 Page 2 of 2 Att. 3 Investigation F8130141 Data Assessment March 20, 2008 Survey Unit. F8130141

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CD F8130141 Gross Activity Sample Results Quantile Plot DCGL = 43000 dpm/1 00cm 2 I

12,000 10,000 8,000 6,000 4,000 2,000 0

2010 0

20 40 60 Percentile 80 100

~I1 00 Direct Measurements (dprn/100cm2) median -

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OQ CD w) 0-1 F8130141 Gross Activity Sample Results Scatter Plot DCGL = 43000 dpmlO00cma Cd)

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...........

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