ML081610159

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Final Status Survey Summary Report, March 12, 2008, Rc Drain Tank (V-600) Room (Lowers), Survey Unit F8130051
ML081610159
Person / Time
Site: Rancho Seco
Issue date: 03/12/2008
From: Tallman D
Sacramento Municipal Utility District (SMUD)
To:
NRC/FSME
References
F8130051
Download: ML081610159 (31)
v • d • e


Text

Rancho Seco Final Status Survey-Summary Report March 12, 2008 RC Drain Tank (V-600) Room (lowers)

Survey Unit F8130051 Prepared By: Dan A. Tallman L.Ž Date: March 12, 2008 FSS5ngne r Reviewed By:

Date: 3/2-/eoe

/

-/Lead S

ngineer Approved By:

7 Date:_______

Dismantlem/nt perintendent, Radiological

FINAL STATUS SURVEY

SUMMARY

REPORT Survey Unit:

F8130051, RC Drain Tank (V-600) Room (lowers)

Survey Unit

Description:

Operating History: The Auxiliary Building was a reinforced concrete structure which 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, the Reactor Coolant Drain Tank (V-600) room within the interior of the auxiliary building was determined to be a Class 1 survey unit.

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 141 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 F8130051

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

F813 Survey Unit:

Class:

SU Area (m2):

Evaluator:

DCGL (dpm/100 cm2):

Area Factor:

Design DCGLemc (dpm/100 cm 2):

LBGR (dpm/100 cm2):

Design Sigma (dpm/100 cm2):

Type I Error:

Type II Error:

Predominant Nuclide:

Sample Area (m2):

Scan Area (mi):

Scan Coverage (%):

Sign P:

Calculated Relative Shift:

Relative Shift Used:

N-Value:

Design N-Value + 20%:

Design Min Samples N:

Grid Spacing L:

00511 141 D.A.Tallman 43000 3.6 156520 21500 9976 0.05 0.05 Cs-137 6.7 141 100%

1.645 1.645 0.97725 2.1 2.1 12 15 21 2.5 RC Drain Tank (V-600)

Room (lowers)

Structure Surface LTP Table 5-4 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 F8130051

Survey Results:

A total of 26 direct measurements were made in F8130051. 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 1922 to 189618 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)

+

F8130051-COOOIBD FB130051-CO002BD F8130051-CO003BD F8130051-CO004BD F8130051-CO005BD F8130051-CO006BD F8130051-C0007BD F8130051-CO008BD F8130051-CO009BD F8130051-CO01OBD F8130051-CO011BD F8130051-CO012BD F8130051-CO013BD F8130051-CO014BD F8130051-CO015BD F8130051-Co016BD F8130051-CO017BD F8130051-CO018BD F8130051-CO01 9BD F8130051-CO02OBD F8130051 -C0021 BD F8130051-CO022BD F8130051 -CO023BD F8130051-C0024BD F8130051-C0025BD F8130051-C0026BD Mean:

Median:

Standard Deviation:

Range:

2422 2148 1982 1707 1644 1971 27664 2324 1608 1790 1733 1769 1779 1940 7221 2293 2013 4565 2760 5493 3138 2557 2028 2314 2843 2848 3560 2220 5084 1608 -27664 Page 4 of 8 FSS Summary Report F8130051

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

F8130051 COOOI SM F8130051 C0002SM F8130051 C0003SM F8130051CO0004SM F8130051CO005SM F8130051CO006SM F8130051 C0007SM F8130051 C0008SM F8130051 C0009SM F8130051Co010SM F8130051C0011SM F8130051Co012SM F8130051 Co013SM F8130051C0014SM F8130051Co015SM F8130051CO016SM F8130051Co017SM F8130051CO018SM F8130051Co019SM F8130051 C0020SM F8130051C0021SM F8130051 C0022SM F8130051 C0023SM F8130051 C0024SM F8130051 C0025SM F8130051 C0026SM Mean:

Median:

Standard Deviation:

Range:

11.97 4.22 1.64 9.38 4.22 2.93

-2.24 32.63 8.09 4.22 126.91 11.97 14.55 70.08

-0.95 4.22

-0.95 17.13 28.76 21.01 2.93 1.64 48.13 32.63 10.68 1.64 17.98 8.74 27.92

-2.24 to 126.91

=

Page 5 of 8 FSS Summary Report F8130051

Survey Unit Data Assessment:

The survey design required 26 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 Page 6 of 8 ~FSS Summary Report P

30 F8130051

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):

26 Median (dpm/100 cm 2):

2220 Mean (dpm/100 cm 2):

3560 Direct Measurement Standard Deviation 5084 (dpm/100 cm 2):

Total Standard Deviation (dpm/100 cm 2):

5084 Based on samples and backgrounds.

Maximum (dpm/100 cm2):

27664 Material Type:

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

26 S+ Value:

26 Critical Value:

17 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 F8130051

Survey Unit Investigations and Results:

Six (6) investigations (scan grids 0 19, 143, 145, Junctures 02, & 42, and Penetration 02) 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. 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 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 that the data quality objectives were met.

It is concluded that survey unit F8130051 meets the release criteria of 1 OCFR20.1402.

Page 8 of 8 FSS Summary Report F8130051 Maps March 12, 2008 Survey Unit F8130051

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813OOOOI SHEET 1 of 1 RC RA"MOND Instrumentation March 12, 2008 Survey Unit F8130051

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; 203481 43-68B; 161405 433 1033 M2350; 142507 43-68B; 160781 433 1033 M2350; 193715 43-68B; 160703 433 1033 M2350; 149789 43-1.16-IB; 256006 796 3258 M2350; 193715 43-116-IB; 190643 M2350; 149789 43-116-1B; 256006 491' 1060' M2350; 193715 43-116-1B; 190643 Tennelec; 0401171 N/A 6 dpm a, 12 dprn3 N/A 43-116-lB - Juncture Scan - concrete Table 2-2. Investigation Criteria and DCGL Value Parameter Vmlucm (dpml100 cm2)

Investigation Criteria - Direct 156520 Investigation Criteria - Scan 43000 DCGLw 43000A DCGLEMC 156520 A Investigation Level set at DCGLw as conservative measure.

Page 2 of 2 Att. 2 Instrumentation F8130051 Investigation March 12, 2008 Survey Unit F81 30051 Page. 1, of 2 Page.1'of 2Att.

3 Investigation F8130051 Investigation March 12, 2008 Survey Unit F8130051 Table 3-1 Survey Unit Investigation Investigation Initial Value Investigation Elevated Area Investigation DCGLemc iResult DCGLemc Result Unity Level (cpm)

(cpm)

(cpm)

Area (m2)

Factor (dpm/lOOcm2)

Fraction Grid 19 11990*

2154 1723 NA NA NA NA

<DCGLw Grid 145 5840 25848 13262 0.22 60.95 2,620,881 153,584 0.056 Grid 143 5840 13468 5919 0.04 326 14,022,374 68547 0.0045 J-42 4260 4529 5515 0.02 649 27,913,730 63868 0.0021 J-02 1990*

3031 2498 NA NA NA NA

<DCGLw P-02 1990*

2013 2013 0.4 34.65 1,489,303 43380 0.025

  • - Investigation Level as documented within the survey instructions = 1100 cpm above background. Subsequent to survey performance, the IL was revised to the 1990 value based on the scan speed coefficient modification (0.42 vs. 0.76)

Survey Unit Remainder DCGL=

SU Mean 0.14 43,000 6194 EMC Unity Sum 0.2318 Page 2 of 2 Att. 3 Investigation F8130051 Data Assessment March 12, 2008 Survey Unit F8130051

F8130051 Gross Activity Sample Results Quantile Plot k)o DCGL 43000 dpm/1 00cm2 30,000 4*4 25,000

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