ML090850557

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Final Status Survey Report for October 20, 2008, Turbine Building High Pressure Pedestals, (+) 20 El. to (+) 40 El., Survey Unit F8261003
ML090850557
Person / Time
Site: Rancho Seco
Issue date: 10/20/2008
From: Donna Anderson
Sacramento Municipal Utility District (SMUD)
To:
NRC/FSME
Shared Package
ML090830613 List: ... further results
References
DPG 09-097
Download: ML090850557 (44)
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Rancho Seco Final Status Survey Summary Report October 20, 2008 Turbine Building High Pressure Pedestals, (+) 20' El. to (+) 40' El.

Survey Unit F8261003 Prepared By:

Reviewed By

c. g-QLA

___A Date: _1_________

FSS Engineer Date: -o

,/76 Lead FSS Engineer Approved By:m Date: _

_-Z_-_

Dismantlement kierintendent, Radiological

FINAL STATUS SURVEY

SUMMARY

REPORT Survey Unit:

F8261003, Turbine Building High Pressure Pedestals, (+/-) 20' El. to (+) 40' El.

Survey Unit

Description:

Operating History: The reinforced concrete and steel structure contained the turbine-generator and supporting systems. The building contained five 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 in the condenser pit elevation showed a mean gross activity level of 3,077 dpm/100 cm 2 and a maximum value of 24,900 dpm/1 00 cm2. Direct measurements on the grade elevation showed a mean gross activity level of 2,035 dpm/l00 cm 2 and a maximum value of 6,980 dpm/100 cm 2. Direct measurements on the mezzanine elevation showed a mean gross activity level of 1,566 dpm/100 cm 2 and a maximum value of 2,626 dpm/100 cm 2. Direct measurements on the +40' elevation showed a mean gross activity level of 2,843 dpm/100 cm 2 and a maximum value of 3,615 dpm/100 cm 2. Direct measurements on the building exterior showed a mean gross activity level of 1,984 dpm/l100 cm 2 and a maximum value of 10,312 dpm/100 cm 2. Based on the classification procedure (DSIP-0020) and levels of gross activity reported, the interior of the turbine building was determined to be Class 1, 2, & 3 areas and the exterior was a Class 3.

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 309.8 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 10 FSS Summary Report F8261003

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

F826 Survey Unit:

Class:

SU Area (m2):

Evaluator:

DCGL (dpm/100 cm2):

Area Factor:

Design DCGLemc (dpm/100 cm2):

LBGR (dpm/100 cm2):

Design Sigma (dpm/100 cm2):

Type I Error:

Type II Error:

Predominant Nuclide:

Sample Area (m2):

Scan Area (M2):

Scan Coverage (%):

Zl-, :

Sign P:

Calculated Relative Shift:

Relative Shift Used:

1003 1

309.8 D. Anderson 43,000 3.5 163,400 25,030 5,990 0.05 0.05 Cs-137 6.9 309.8 100%

1.645 1.645 0.99865 3

3 Turbine Building High Pressure Pedestals, (+) 20' El. to (+) 40' El.

Structure Surface LTP Table 5-4

  • Gross Activity DCGL Class I Class I Adjusted Class 1 Class 1 Uses 3.0 if Relative Shift is

>3 NUREG-1575 Table 5-5 Class 1 Class 1 N-Value:

Design N-Value + 20%:

Design Min Samples N:

Grid Spacing L:

11 14 45 2.6 Page 3 of 10 FSS Summary Report F8261003

Survey Results:

A total of 50 direct measurements were made in F8261003. The results including mean, median, standard deviation and range are shown in Table 2. All direct measurements were less than the DCGL. None of the scan measurements indicated areas of elevated activity. The gamma scan activity ranged from < 752 dpm/100 cm 2 Co-60 and < 1,030 dpm/100 cm 2 to 2,889 dpm/100 cm 2 Cs-137. Beta scan activity ranged from 1,445 to 44,257 dpm/100 cm', 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 F8261003-CO001 BD 1,665 F8261003-CO002BD 1,458 F8261003-CO003BD 1,644 F8261003-CO004BD 3,600 F8261003-CO005BD 1,582 F8261003-CO006BD 1,504 F8261003-CO007BD 2,101 F8261003-CO008BD 2,023 F8261003-CO009BD 1,442 F8261003-CO01 OBD 1,541 F8261003-CO01 1 BD 1,297 F8261003-CO012BD 1,261 F8261003-CO013BD 1,266 F8261003-CO014BD 1,484 F8261003-CO015BD 1,717 F8261003-CO01 6BD 1,504 F8261003-CO017BD 1,432 F8261003-CO018BD

.1,722 F8261003-CO019BD 6,733 F8261003-CO02OBD 1,592 F8261003-CO021BD 908 F8261003-CO022BD 1,655 F8261003-CO023BD 2,044 F8261003-XO024BD 3,483 F8261003-CO025BD 1,598 F8261003-CO026BD 2,500 F8261003-XO027BD 3,119 F8261003-CO028BD 2,967 F8261003-CO029BD 2,075 F8261003-CO03OBD 1,556 F8261003-CO031 BD 1,525 F8261003-CO032BD 1,437 F8261003-CO033BD 1,546 F8261003-CO034BD 1,359 F8261003-CO035BD 1,484 Page 4 of 10 FSS Summary Report F8261003

Measurement ID Gross Activity (dpm/100 cm i

F8261003-CO036BD F8261003-CO037BD F8261003-CO038BD F8261003-CO039BD F8261003-CO04OBD F8261003-C0041 BD F8261003-CO042BD F8261003-CO043BD.

F8261003-MOO44BD F8261003-MO045BD F8261003-MOO46BD F8261003-MOO47BD F8261003-CO048BD F8261003-CO049BD F8261003-CO05OBD Mean:

Median:

Standard Deviation:

Range:

1,209 2,371 2,412 2,355 2,059 2,381 2,288 2,547 794 1,067 1,052 1,015 2,272 1,945 2,251 1,917 1,621 931 794 -6,733 Page 5 of 10 FSS Summary Report F8261003

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

F8261003C0001SM 9.38 F8261003CO002SM

-2.24 F8261003CO003SM 0.34 F8261003C0004SM 8.09 F8261003C0005SM

-2.24 F8261003C0006SM

-4.82 F8261003C0007SM 4.22 F8261003C0008SM

-0.95 F8261003CO009SM

-3.53 F8261003C0010SM

-2.24 F8261003C0011SM 0.34 F8261003C0012SM

-2.24 F8261003C0013SM

-2.24 F8261003C0014SM

-0.95 F8261003C0015SM

-0.95 F8261003C0016SM

-2.24 F8261003C0017SM

-2.24 F8261003C0018SM

-2.24 F8261003C0019SM 26.17 F8261003C0020SM 1.64 F8261003C0021SM 0.34 F8261003C0022SM

-3.53 F8261003C0023SM 0.34 F8261003X0024SM

-2.24 F8261003C0025SM

-4.82 F8261003C0026SM

-0.95 F8261003X0027SM

-4.82 F8261003C0028SM 1.64 F8261003C0029SM 8.09 F8261003CO030SM

-3.53 F8261003C0031SM

-2.24 F8261003C0032SM

-4.82 F8261003C0033SM

-3.53 F8261003C0034SM 0.34 F8261003C0035SM

-4.82 F8261003C0036SM 0.34 F8261003C0037SM 6.8 F8261003C0038SM 10.68 F8261003C0039SM 1.64 F8261003C0040SM 5.51 F8261003C0041SM

-2.24 F8261003C0042SM 10.68 F8261003C0043SM 5.51 F8261003M0044SM

-3.53 F8261003M0045SM

-0.95 F8261003M0046SM 0.34 F8261003M0047SM

-4.82 F8261003C0048SM 1.64 Page 6 of 10 FSS Summary Report F8261003

Measurement ID Surface Beta Activity (dpm/100 cm 2)

F8261003C0049SM 13.26 F8261003C0050SM 10.68 Mean:

1.04 Median:

-0.95 Standard Deviation:

6 Range:

-4.82 to 26.17 Page 7 of 10 FSS Summary Report F8261003

Survey Unit Data Assessment:

The survey design required 50 direct measurements for the Sign Test. The critical value and the results of the Sign Test are presented in Table 4. Thesample 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 F8261003

Table 4. Data Assessment Results Survey Results Parameter Value Comment Material Background Used (dpm/1O0 cm 2):

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

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

50 Median (dpm/100 cm 2):

1,621, Mean (dpm/100 cm 2) 1,917 Direct Measurement Standard Deviation 931 (dpm/100 cm 2):

Total Standard Deviation (dpm/100 cm2):

931 Based on samples and backgrounds.

Maximum (dpm/100 cm 2):

6,733 Material Type:

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

50 S+ Value:

50 Critical Value:

31 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 F8261003

Survey Unit Investigations and Results:

No investigations were required for either direct or scan measurements and no investigation results are reported.

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. No potentialareas of elevated activity were detected. 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 43,000 dpm/100 cm 2 and none of the removable surface activity measurements exceeded 10% of the DCGL. No investigations were required.

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 F8261003 meets the release criteria of 10CFR20.1402.

Page 10 of 10 FSS Summary Report 1

F8261003 Maps October 20, 2008 Survey Unit F8261003

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Y Map F8261003-1, Location of Turbine Building at Rancho Seco site

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North Column Looking North 932 ft 2 - 86.6 m' I

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North Column Looking North North Column Developed Looking South Reflected View 0.0 1.0 2.0 3.0 4.0 Distance in Meters EnV Developed Reflected View 277 ft2 - 25.7 m2 Map F8261003-2, Turbine Building (+) 0' El. to (+) 40' El.

High Pressure Turbine Pedestals - North Column Area Estimate: 2,266 sq ft. - 210.5 sq. meters F8261003 Area Estimate: 112.3 sq. meters F8261004 Area Estimate: 40.0 sq. meters F8261005 Area Estimate: 98.2 sq. meters El F8261003, Class 1 El F8261004, Class 1 ED F8261005, Class 2

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North High Pressure Turbine Pedestal Looking North North High Pressure Turbine Pedestal Looking South Map F8261003-3

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Developed Refelected View 0] F8261003, Class 1 0l F8261004, Class 1 ED F8261005, Class 2 Developed Reflected View 115 ft2 _ 10.7 m2 17 00 C0 0.0 1.0 2V0 3.0 4.0 Distance in Meters Map F8261003-4, Turbine Building (+) 0' El. to (+) 40' El.

High Pressure Turbine Pedestals - South Column Area Estimate: 1,151 sq ft. - 106.9 sq. meters F8261003 Area Estimate: 67 sq. meters F8261004 Area Estimate: 40 sq. meters

Map F8261003-5, Turbine Building (+) O' El. to (+) 40' El.-'-

High Pressure Turbine Pedestals-South Column Looking South Page 6 of 27 Att. I Maps F8261003

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8'7" 6'2" West Column Looking West 576 ft2 - 53.5 m' L 4'6"-1-3'6"1L 14'2" 1

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West Column Looking West El F8261003, Class 1 0 F8261004, Class 1 0 F8261005, Class 2 Developed Reflected View 134.3 ftW - 12.5 m2 West Column Looking East Developed Reflected View Map F8261003-6, Turbine Building (+) 0. El. to (+) 40' El.

High Pressure Turbine Pedestals - West Column Area Estimate: 1,428.3 sq ft. - 132.7 sq. meters F8261003 Area Estimate: 40.0 sq. meters F8261004 Area Estimate: 26.0 sq. meters F8261005 Area Estimate: 66.7 sq. meters 0.0 1.0 2.0 3.0 4.0 Distance m Meters

Map F8261003-7, Turbine Building (+) O' El. to (+),40' El.

Hiqh Pressure Turbine Pedestals West Column Lookinq West Page 8 of 27 Att. 1 Maps F8261003

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[I F8261003, Class 1 C] F8261004, Class 1 13 F8261005, Class 2 17 17-4/

-IF Dw East Column Developed Looking West Reflected View 0ý0 1.0 2.0 3.0 4.0 Distance m MeteMs Developed Reflected View 134.3 f - 12.5 m2 Map F8261003-8, Turbine Building (+) 0' El. to (+) 40' El.

High Pressure Turbine Pedestals - East Column Area Estimate: 1,428.3 sq ft. - 132.7 sq. meters F8261003 Area Estimate: 40.0 sq. meters F8261004 Area Estimate: 26.0 sq. meters F8261005 Area Estimate: 66.7 sq. meters

Map F8261003-9, Turbine Building (+) 0 El. to (+) 40' El.

High Pressure Turbine Pedestals East Column Looking West Page 10 of 27 Att. 1 Maps F8261003

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North Portion Area Estimate:

29.05 sq. meters South Portion Area Estimate:

21.45 sq. meters N

HP Turbine Pedestal Plan View - 40' El.

0 F8261003, Class 1 Fl F8261004, Class 1 III F8261005, Class 2 HP Turbine Pedestal Plan View 40'-0" Elevation 544 ft' - 50.5 m' 0.0 0

210 3,0 Distance in Meters Map F8261003-1 0, Turbine Building (+) 40' El.

High Pressure Turbine Pedestals -

Plan View at 40' Elevation Area Estimate: 544 sq ft. - 50.5 sq. meters F8261003 Area Estimate: 50.5 sq. meters

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High Pressure Turbine Pedestals o-Views at 40' Elevation U) oNorth Column Looking North

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-1 F8261004, Class 1 69 F8261 005, Class 2 01 t

I 26'4" 21'8" 48'

-1 0.0 1.0 2.0 3.0 4.0 Distance in Meters Map F8261003-12, Turbine Building (+) 0' El.

High Pressure Turbine Pedestals - Floor Surface Area with Trench Vertical Surfaces Area Estimate: 1,402 sq ft. - 130.2 sq. meters

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0.5 1.0 1.5 2.0 Distance in Meters Developed Reflected View Map F8261003-14, Turbine Building (+) 0' El. to (+) 40' El.

High Pressure Turbine Pedestals - East and South Columns Beta Direct Measurements F8261003C0013BD to F8261003C0023BD, F8261003X0024BD, F8261003C0025BD to F8261003C0026BD, F8261003X0027BD, and F8261003C0028BD to F8261003C0031 BD 2.5 meter qrid spacinq Developed Reflected View

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0 0.58 m from edge 0.50 m from edge 00 C)J Developed Reflected View Map F8261003-15, Turbine Building (+) 0' El. to (+) 40' El.

High Pressure Turbine Pedestals - West and North Columns Beta Direct Measurements F8261003C0001BD to F8261003C0012BD and F8261003C0032BD to F8261003C0036BD 2.5 meter arid spacina 0

0.5 1.0 1.5 2.0 Distance in Meters

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Map F8261003-16, Turbine Building (+) 40' El.

High Pressure Turbine Pedestals - Plan View at 40' Elevation Beta Direct Measurements F8261003C0037BD to F8261003C0043BD, F8261003M0044BD to F8261003M0047BD, and F8261003C0048BD to F8261003C0050BD 2.5 meter grid spacing S0.5 1-0 1.5 2.0 Distance in Meters

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Developed Reflected View 1 m Developed Reflected View 171B 166BS F65BS OBS 159BS C 253BS 250BS 249BS 246BS 245BS 242BS 241BS 00 C)

W 170B3 167S 64BS 1 IBS 158BS Crt 169BS 168BS 163BS !62BS 157BS 174BS I 252BS1I251B3S1248B3S I247B3S I 244BS11 243BS1 24OBS I Map F8261003-17, Turbine Building (+) 0' El. to (+) 40' El.

High Pressure Turbine Pedestals - East and South Columns Beta Scan Measurements 0 0.5 1.0 1.5 2.0 Distance in Meters

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181 S 180BS 179BS 178BS 177BS 376BS 53S F1 8cis U

183BS 184 185BS 1868S 187BS 138BS 189BS C 8

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Developed Reflected View 0 05 1.0 1.5 2-0 Distance in Meters Map F8261003-18, Turbine Building (+) 0' El. to (+) 40' El.

High Pressure Turbine Pedestals - West and North Columns Beta Scan Measurements

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Nor0n uolumn LOOKing NORtM West Column Looking West L:ast ',olumn LOOKIng Last Map F8261003-19, Turbine Building High Pressure Turbine Pedestals Beta Scan Measurements

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0 0.5 1ý0 15 2.0 Distance in Meters Map F8261003-20, Turbine Building (+) 40' El.

High Pressure Turbine Pedestals - Plan View at 40' Elevation Beta Scan Measurements

)Iumn Looking West Beta Scan Measurements Page 22 of 27 Att. I Maps F8261003

South Column Looking South Beta Scan Measurements North Column Looking North Beta Scan Measurements.

Att. 1 Maps North Column Looking North Beta Scan Measurements Page 23 of 27 F8261003

North Column - underside of arch Beta Scan Measurements Page 24 of 27 Att. 1 Maps F8261003

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Measurement performed A

at 45-degree angle N

Map F8261003-21, Turbine Building (+) 40' El.

High Pressure Turbine Pedestals ISOCS Gamma Scan Measurements F8261003C0001GS to F8261003C0002GS and F8261003C0004GS to F8261003C0009GS 7 sq. meter field of view F8261003C0003GS downward looking into shaft with cover removed I

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N 0 0.5 1.0 1.5 2 0 Distance in Meters Map F8261003-22, Turbine Building (+) 40' El.

High Pressure Turbine Pedestals - Plan View at 40' Elevation ISOCS Gamma Scan Measurements F8261003C001OGS to F8261003C0025GS 3.14 sq. meter field of view

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Map F8261003-23, Turbine Building (+40'El..

to High Pressure Turbine Pedestals

~ISOCS Gamma Scan Measurements C>i*

F8261003C0026GS to F8261003C0034GS

~3.14 sq. meter field of view (downward looking)

F8261003C0035GS and F8261003C0036GS downward looking into shafts Instrumentation October 20, 2008 Survey Unit F8261003

Table 2-11 Survey Unit Instrumentation Instrument Detector MDC Static MDC Scan Model; Serial No.

Model; Serial No.

(dpm/100 cm2 )

(dpm/100 cm 2)

M2350; 149789 43-68B; 161415' 433 1,033 M2350; 149789 43-68B; 1614152 909 2,169 M2350; 149789 43-68B; 1614153 257 612 M2350; 203486 43-68B; 161400 433 1,033 M2350; 175834 43-68B; 148634 433 1,033, Tennelec; 0401171 N/A 5.88dpm N/A 11.71 dpm 3 1Concrete surfaces 2Concrete surfaces with 1 3Metal surfaces layer of paint MDC Concrete - 1,030 dpm/100 cm 2 Cs-137, Concrete - 752 dpm/100 cm2 Co-60 Table 2-2. Investigation Criteria and DCGL Value Param eterV a u C M (dpm/100 cm2)

Investigation Criteria - Direct 163,400 Investigation Criteria - Scan 163,400 Investigation Criteria-Scan 186,000 Cs137 (ISOCS average activity - 3.14 64,000 Co-60 sq. meter field of view)

Investigation Criteria - Scan 115,000 Cs-137 (ISOCS average activity - 7.1 40,000 Co-60 sq. meter field of view)

DCGLw 43,000 DCGLEMC 163,400 Page 2 of 2 Att. 2 Instrumentation F8261003 Investigation October 20, 2008 Survey Unit F8261003 (none required)

Data Assessment October 20, 2008 Survey Unit F8261003

CF8261003 Gross Activity Sample Results Quantile Plot DCGL = 43,000 dpm/100 cm' 8,000 -I 6,000 I

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5,000 -'

2,000 1D k

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20 40 60 80 100 Percentile 0

Dir.ct Measurements (dprn/lOcm2) median 75th Percentile

-- 50th Percentile

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F8261003 Gross Activity Sample Results Scatter Plot DCGL = 43,000 dpml00 cm=2 8000 7000 E

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4000 3000 -

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"-3StDev"(

C1 GO F8261,003 Gross Activity Frequency Plot DCGL = 43,000 dppm1l 00 cmr U1)

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(\\J 00 ON Bins - Upper End Value (dpm/1 00cm2)

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