ML090850558

Final Status Survey Report for October 7, 2008, Turbine Building High Pressure Pedestals, (+) 0' El. to (+) 20' El. Survey Unit F8261004

ML090850558
Person / Time
Site:	Rancho Seco
Issue date:	10/07/2008
From:	Donna Anderson Sacramento Municipal Utility District (SMUD)
To:	NRC/FSME
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References
DPG 09-097
Download: ML090850558 (35)

Text

1J Rancho Seco Final Status Survey Summary Report October 7, 2008 Turbine Building High Pressure Pedestals, (+) 0' El. to (+) 20' El.

Survey Unit F8261004 Prepared By: .- o*,__-- Date:. I/07/ 20" FSS Engineer Reviewed By:. Date: (0 fi?

Lead FSS Engineer Approved By: Ž?Date: __-_7_

Dismantlement Superintendent, Radiological

FINAL STATUS SURVEY

SUMMARY

REPORT Survey Unit:

F8261004, Turbine Building High Pressure Pedestals, (+) 0' El. to (+) 20' 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/l100 cm 2 and a maximum value of 24,900 dpm/l 00 cm 2 . Direct measurements on the grade elevation showed a mean gross activity level of 2,035 dpm!100 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/100 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 262.2 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 9 FSS Summary Report F8261004

Table 1. Survey Unit Design Parameters Survey Design Value Comment Parameter Survey Area: F826 Turbine Building High Pressure Pedestals, (+) 0' El. to (+) 20' El.

Survey Unit: 1004 Structure Surface Class: 1 LTP Table 5-4 SU Area (m2): 262.2 Evaluator: D. Anderson DCGL (dpm/100 cm 2): 43,000 Gross Activity DCGL Area Factor: 3.8 Class 1 Design DCGLemc 163,400 Class 1 (dpm/100 cm 2):

LBGR (dpm/100 cm 2): 25,030 Adjusted Design Sigma (dpm/100 cm 2 ): 5,990 Type I Error: 0.05 Type II Error: 0.05 Predominant Nuclide: Cs-137 Sample Area (m2): 6.9 Class 1 Scan Area (m2): 262.2 Scan Coverage (%): 100% Class 1 Zl-a :

1.645 1.645 Sign P: 0.99865 Calculated Relative Shift: 3 Relative Shift Used: 3 Uses 3.0 if Relative Shift is

>3 N-Yalue: 11 Design N-Value + 20%: 14 NUREG-1575 Table 5-5 Design Min Samples N: 38 Class 1 Grid Spacing L: 2.6 Class 1 Page 3 of 9 FSS Summary Report F8261004

Survey Results:

A total of 43 direct measurements were made in F8261004. The results including mean, median, standard deviation and range are shown in Table 2. All direct measurements were less than the DCGL. One scan measurement indicated an area of elevated activity

(> DCGLEMC). Due to scan measurements that were greater than the DCGL, a total of nine scan grids were investigated. Beta scan activity ranged from 3,045 to 187,872 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 Attachment 2.

Page 4 of 9 FSS Summary Report F8261004

Table 2. Direct Measurement Results Measurement ID Gross Activity (dpm/100 cm) i F8261004-CO001 BD 1,758 F8261004-XO002BD 4,023 F8261004-XO003BD 5,015 F8261004-XO004BD 2,877 F8261004-XO005BD 3,737 F8261004-CO006BD 2,028 F8261004-CO007BD 1,976 F8261004-CO008BD 1,857 F8261004-C0009BD 2,148 F8261004-XOOIOBD 3,153 F8261004-C0011BD 1,841 F8261004-CO012BD 1,727 F8261004-CO013BD 2,028 F8261004-Co014BD 2,179 F8261004-Co015BD 1,738 F8261004-CO016BD 1,961 F8261004-XO017BD 5,589 F8261004-XO018BD 3,428 F8261004-XO019BD 4,641 F8261004-CO02OBD 1,862 F8261004-C0021 BD 1,899 F8261004-XO022BD 3,494 F8261004-CO023BD 1,847 F8261004-CO024BD 1,681 F8261004-XO025BD 3,351 F8261004-CO026BD 1,670 F8261004-CO027BD 1,686 F8261004-CO028BD 6,375 F8261004-CO029BD 1,779 F8261004-XO030BD 2,028 F8261004-X0031BD 2,260 F8261004-XO032BD 5,104 F8261004-CO033BD 6,126 F8261004-CO034BD 1,707 F8261004-CO035BD 2,033 F8261004-XO036BD 3,395 F8261004-CO037BD 2,044 F8261004-XO038BD 3,351 F8261004-XO039BD 3,461 F8261004-XO040BD 4,090 F8261004-X0041 BD 3,792 F8261004-Co042BD 1,774 F8261004-CO043BD 1,644 Mean: 2,841 Median: 2,044 Standard Deviation: 1,329 Ranqe: 1,644 - 6,375 Page 5 of 9 FSS Summary Report F8261004

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

F8261004C0001 SM -0.95 F8261004X0002SM 4.22 F8261004X0003SM -0.95 F8261004X0004SM 0.34 F8261004X0005SM -3.53 F8261004CO006SM -3.53 F8261004C0007SM 0.34 F8261004CO008SM -0.95 F8261004C0009SM -4.82 F8261004X0010SM -0.95 F8261004C001 1SM 5.51 F8261004C0012SM -4.82 F8261004C0013SM -3.53 F8261004C0014SM -3.53 F8261004C0015SM 0.34 F8261004C0016SM 0.34 F8261004X0017SM 0.34 F8261004X0018SM -2.24 F8261004X0019SM -3.53 F8261004C0020SM 2.93 F8261004C0021SM -2.24 F8261004X0022SM -4.82 F8261004C0023SM -3.53 F8261004C0024SM -3.53 F8261004X0025SM -0.95 F8261004C0026SM -0.95 F8261004C0027SM 2.93 F8261004C0028SM 30.05 F8261004C0029SM -2.24 F8261004X0030SM -3.53 F8261004X0031SM -2.24 F8261004X0032SM 5.51 F8261004C0033SM 23.59 F8261004C0034SM -3.53 F8261004C0035SM -3.53 F8261004X0036SM -3.53 F8261004C0037SM -2.24 F8261004X0038SM -4.82 F8261004X0039SM -4.82 F8261004XO040SM -4.82 F8261004X0041SM -0.95 F8261004C0042SM -2.24 F8261004C0043SM 0.34 Mean: -0..26 Median: -2.24 Standard Deviation: 6.67 Ranqe: -4.82 to 30.05 Page 6 of 9 FSS Summary Report F8261004

Survey Unit Data Assessment:

The survey design required 43 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 7 ofra9 FSS Summary Report F8261004

Table 4. Data Assessment Results Survey Results Parameter Value Comment Material Background Used (dpm/100 cm2): N/A

'Ambient Background Used (dpm/100 cm 2): N/A Average Ambient BKG = 0 Actual Direct Measurements (N): 43 2

Median (dpm/100 cm ): 2,044 Mean (dpm/IO0 cm 2): 2,841 Direct Measurement Standard Deviation 1,329 (dpm/100 cm 2):

Total Standard Deviation (dpm/100 cm 2

): 1,329 Based on samples and backgrounds.

Maximum (dpm/100 cm 2): 6,375 Material Type: N/A Background Subtract Not Applied Sign Test Final N Value: 43 S+ Value: 43 Critical Value: 27 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 8 of 9 FSS Summary Report F8261004

Survey Unit Investigations and Results:

Nine investigations (scan grids 4, 5, 11, 17, 112, 118, 252, 268 and 269) 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. Nine 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 43,000 dpm/100 cm2 and none of the removable surface activity measurements exceeded 10% of the DCGL. Nine 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 F8261004 meets the release criteria of 10CFR20.1402.

Page 9 of 9 FSS Summary Report F8261004

Attachment 1 Maps October 7, 2008 Survey Unit F8261004

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,T- North Column North Column Develope id 277 ft2 - 25.7 m2 00 Looking South Reflected V'iew Looking North oo 0o Map F8261004-2, Turbine Building (+) 0' El. to (+) 40' El.

O1 F8261003, Class 1 High Pressure Turbine Pedestals - North Column Area Estimate: 2,266 sq ft. - 210.5 sq. meters 0] F8261004, Class 1 0.0 1.0 2.0 3.0 4-0 F8261003 Area Estimate: 112.3 sq. meters Distance n Metms F8261004 Area Estimate: 40.0 sq. meters 9 F8261005, Class 2 F8261005 Area Estimate: 98.2 sq. meters

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00 Developed Refelected View 0l F8261003, Class 1 0 F8261004, Class 1

[a F8261005, Class 2 I I 1Ii Developed Reflected View 115 ft2 - 10.7 m2 00 0.0 1,0 2.0 3.0 4.0 Map F8261004-3, Turbine Building (+) 0' El. to (+) 40' El.

Distance in MWtors 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

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00 17'4" Nb Developed Reflected View It1 00 134.3 ft' - 12.5 m2 West Column West Column Developed Looking West Looking East Reflected View Map F8261004-4, Turbine Building (+) 0' El. to (+) 40' El.

High Pressure Turbine Pedestals - West Column 1] F8261003, Class 1 Area Estimate: 1,428.3 sq ft. - 132.7 sq. meters

[] F8261004, Class 1 F8261003 Area Estimate: 40.0 sq. meters 0.0 1.0 20 3.0 4.0 Distance in Melers F8261004 Area Estimate: 26.0 sq. meters t] F8261005, Class 2 F8261005 Area Estimate: 66.7 sq. meters

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~lw 134.3 ft2 - 12.5 m' 00 East Column East Column Developed oo Looking East Looking West Reflected View Map F8261004-5, Turbine Building (+) 0' El. to (+) 40' El.

0o 4:2 High Pressure Turbine Pedestals - East Column fl F8261003, Class 1 Area Estimate: 1,428.3 sq ft. - 132.7 sq. meters 0 F8261004, Class 1 F8261003 Area Estimate: 40.0 sq. meters 0.0 1.0 2.0 3.0 Distance in Meters 40 F8261004 Area Estimate: 26.0 sq. meters M F8261005, Class 2 F8261005 Area Estimate: 66.7 sq. meters

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O1F8261004, Class 1 Map F8261004-6, Turbine Building (+) O' El.

IMF8261005, Class 2 High Pressure Turbine Pedestals - Floor Surface Area 0.0 1.0 2.0 3.0 4.0 Distance in Meters with Trench Vertical Surfaces Area Estimate: 1,402 sq ft. - 130.2 sq. meters

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.. E E E E E E West edge -- to 0 U) 0 0 0U) of survey unit 0 00 Map F8261004-8, Turbine Building (+) O' El.

High Pressure Turbine Pedestals - Floor Surface Area C N Beta Direct Measurements F8261004C000 1 BD, F8261004X0002BD to F8261004XO005BD F8261004CO006BD to F8261004CO009BD, F8261004XO010BD, F8261004C0011BD to F8261004CO016BD, 0 0.5 1.0 1.5 2.0 Distance in Meters F8261004X0017BD to F8261004X0019BD (2.5 meter grid spacing)

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0 O0 v -m0.58 m 0.08 m from edge 0.50 m from edge from edge from edge Map F8261004-9, Turbine Building (+) 0' El. to (+) 40' El.

High Pressure Turbine Pedestals - East and South Columns Beta Direct Measurements Iz1 F8261004X0025BD, 00 F8261004C0026BD to F8261004C0027BD, F8261004X0032BD, F8261004C0033BD to F8261004C0035BD, F8261004X0036BD, F8261004C0037BD, F8261004X0038BD, F8261004C0042BD to F8261004C0043BD 0 0.5 1.0 1.5 2.0 Distance in Meters 2.5 meter grid spacing

05 00 7

Looking North V 0.72 m 0.58 m 0.50 m 1.04 m from edge from edge from edge from edge Map F8261004-10, Turbine Building (+) 0' El. to (+)40' El.

High Pressure Turbine Pedestals - West and North Columns Beta Direct Measurements 00 F8261004C0020BD to F8261004C0021 BD, F8261004X0022BD F8261004C0023BD to F8261004C0024BD, F8261004C0028BD to F8261004C0029BD,

• F8261004X0030BD to F8261004X0031BD, and F8261004X0039BD to F8261004X0041 BD 0 0.5 1.0 1.5 2.0 Distance in Meters 2.5 meter grid spacing

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C-Il 00 Map F8261004-11; Turbine Building (+) 0' El. to (+) 40' El.

_ - Concrete painted with 1 layer of paint High Pressure Turbine Pedestals - East and South Columns Beta Scan Measurements I

F8261004C0001BS to F8261004C0036BS, F8261004C0043BS to F8261004C0072BS, and Ditace inMetr F8261004C0103BS to F8261004C01 14BS

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ItJ 00 Map F8261004-12, Turbine Building (+) 0' El. to (+) 40' El.

High Pressure Turbine Pedestals - West and North Columns Beta Scan Measurements I M - Concrete painted with 1 layer of paint F8261004C0037BS to F8261004CO06OBS, F8261004C0073BS to F8261004C0102BS, and 0 0.5 1-0 1.5 2.0 F8261004C0109BS to F8261004C0132BS Distance in Meters

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244BS 243BS 242BS 241 BS 240BS 239BS 212BS 211BS 210BS 209BS 208BS 207BS 185BS 186BS 187BS 188BS 189BS 190BS 191B5 192BS 193BS 194BS 195BS 182BS 181BS 18085 179BS 17885 17785 17685 175BS 174BS 17385 17285 J

158BS 159BS 160BS

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Map F8261004-13, Turbine Building (+) 0' El.

'71 High Pressure Turbine Pedestals - Floor Surface Area 00 C)

I M - Concrete painted with 1 layer of paint Beta Scan Measurements C) F8261004C0133BS to F8261004C0213BS, N F8261004C0221BS to F8261004C0228BS, F8261004C0230BS to F8261004C0237BS, F8261004C0239BS to F8261004C0245BS, 0 0.5 1.0 1.5 2.0 Distance in Meters F8261004C0255BS to F8261004C0256BS, and F8261004C0259BS to F8261004C0285BS

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00 00 C) Map F8261004-14, Turbine Building (+) 0' El.

ik High Pressure Turbine Pedestals - Trench Walls I M - Concrete painted with 1 layer of paint Beta Scan Measurements F8261004C0214BS to F8261004C0237BS, 0 0.5 1.0 1.5 2.0 F8261004C0246BS to F8261004C0254BS, and Distance in Meters F8261004C0257BS to F8261004C0258BS

(0 00 00 N Map F8261004-15, Turbine Building (+) 0' El.

High Pressure Turbine Pedestals - Floor Surface Area 0 0.5 1.0 1.5 2.0 Juncture Scan Measurements Distance in Meters F8261004C0001JS to F8261003C0018JS

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0 East Column South Column Looking East -Looking South 00 Map F8261004-16, Turbine Building (+ ' El. to (+40 El.

High Pressure Turbine Pedestals - East and South Columns Juncture Scan Measurements 0 0.5 1.0 1.5 2.0 Ditac inMetem F8261004CO019JS to F8261004C0020JS.

Map F8261004-17, Turbine Building (+) 0' El.

High Pressure Turbine Pedestals Beta Scan: Measurements of Railings F8261004M0286BS to F8261004M0289BS Page 18 of 18 Att. 1 Maps F8261004

Attachment 2 Instrumentation October 7, 2008 Survey Unit F8261004

Table 2-1. Survey Unit Instrumentation Instrument Detector MDC Static MDC Scan Model; Serial No. Model; Serial No. (dpm/l00 cm ) 2 (dpmll00 cm 2 )

M2350; 193700 43-68B; 190294' 433 1,033 M2350; 193700 43-68B; 1902942 909 2,169 M2350; 193700 43-68B; 1902943 257 612 M2350; 203486 43-68B; 161400' 433 1,033 M2350; 203486 43-68B; 1614002 909 2,169 M2350; 193715 43-68B; 160703' 433 1,033 M2350; 193715 43-68B; 1607032 909 2,169 M2350; 189089 43-68B; 148460' 433 1,033 M2350; 189089 43-68B; 1484602 909 2,169 M2350; 175834 43-116-1B; 1906423 472 1,930 M2350; 175834 43-116-1B; 1906424 491 739 Tennelec; 0401171 N/A 5.88 dpm a, N/A 11.71 dpmf3 2'Concrete surfaces Concrete surfaces with I layer of paint 3Metal surfaces 4

Concrete junctures Table 2-2. Investigation Criteria and DCGL Value Param eter (dpm/100 V l eCcm 2 )2 Investigation Criteria - Direct 163,400 Investigation Criteria - Scan 163,400 DCGLw 43,000 DCGLEMC 163,400 Page 2 of 2 Att. 2. Instrumentation F8261004

Attachment 3 Investigation October 7, 2008 Survey Unit F8261004

Table 3-1 Survey Unit Investigation Investigation Initial Value Investigation Elevated Area DCGLemc Investigation DCLemc Result Area () Result Unity Level (cpm)

Gd (cpm) (cpm) (dpm/lOOcm2) Fraction 4 22,200 15,982 12,986 0.026 499.6 21,483,230 67,362 0.003 5 22,200 25,610 34,328 0.062 211.3 9,085,040 178,068 0.020 11 22,200 8,795 6,415 0.068 192.8 8,290,830 33,276 0.000 17 22,200 2,441 8,583 0.077 170.5 7,330,640 44,522 0.006 112 22,200 3,075 2,562 0.052 251.5 10,813,640 13,290 0.000 118 22,200 3,355 3,107 0.052 251.5 10,813,640 16,117 0.000 252 22,200 5,352 6,580 0.065 201.6 8,669,660 34,132 0.000 268 10,500 4,372 4,273 0.124 106.7 4,586,810 47,101 0.010 269 10,500 4,864 4,013 0.333. 45.4 1,950,050 44,235 0.023 DCGL = SU Mean =

Survey Unit Remainder 43,000 2,841 0.066 EMC Unity Sum 0.128 Page 2 of 2 Att. 3 Investigation F8261004

Attachment 4 Data Assessment October 7, 2008 Survey Unit F8261004

F8261004 Gross Activity Sample Results Quantile Plot DCGL = 43000 dpmll 00cm2 7,000 6,000 5,000 4,000 00 II 3,000 2,000 2044 1,000 Cl)

, Pý 0 I0 2 0 20 40 60 80 100 Percentile

• Direct Measurements (dpm/l100cm2) -median - - - 75th Percentile .... 50th Percentilej

CD 0

F8261004 Gross Activity Sample Results Scatter Plot DCGL = 43000 dpml00cm= 1 8000 7000 0 -828 IN 6000 E 0 5000 0 0

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I o Gross Activhty - Average - - "+3SIDev" - - "-3StDev P0 C)

0 F8261004 Gross Activity Frequency Plot 2

DCGL = 43000 dpm/l 00cm 24 23 22 21 20 19 18 17 16 15 14 LL 13 C 12 4-J 00 0 11 10 9

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