ML082620160

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Final Status Survey Summary Report, June 23, 2008, Pump Alley - North of Column 9.7, Walls (Above One Meater) and Ceiling, Sevey Unit F8130431
ML082620160
Person / Time
Site: Rancho Seco
Issue date: 07/29/2008
From: Tallman D
Sacramento Municipal Utility District (SMUD)
To:
NRC/FSME
References
MPC&D 08-064 F8130431
Download: ML082620160 (28)
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Text

Rancho Seco Final Status Survey Summary Report June 23, 2008 Pump Alley - North of column 9.7 walls (above one meter) and ceiling Survey Unit F8130431 Prepared By: Dan A. Tallman Date: June 23, 2008 FSS Enginier Reviewed By: Date: "ti0b Lead FSS.Engineer Approved By: Date:__________

Dismantlement Ouperintendent, Radiological

FINAL STATUS SURVEY

SUMMARY

REPORT Survey Unit:

F8130431, Pump Alley North of column 9.7 walls (above one meter) and ceiling 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 -29' elevation showed a mean gross activity level of 544,756 dpm/l100 cm 2 and a maximum value of 11,370,000 dpm/100 cm 2..Based on the classification procedure (DSIP-0020) and levels of gross activity reported, the upper walls and ceiling of Pump Alley 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 measurement locations were determined using a random-start, fixed grid'pattern and 301.1 m 2 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 F8130431

Table 1. Survey Unit Design Parameters Survey Design Value Comment Parameter Survey Area: F813 Pump Alley North of column 9.7 walls (above one meter) and ceiling Survey Unit: 0431 Structure Surface Class: 1 LTP Table 5-4 SU Area (m2): 301.1 Evaluator: D.A.Tallman DCGL (dpmI1O0 cm 2): 43000 Gross Activity DCGL Area Factor: 3.5 Class 1 Design DCGLemc 154566 Class 1 (dpm/100 cm 2):

LBGR (dpm/100 cm 2): 21500 Default = 50% DCGL 2

Design Sigma (dpm/100 cm ): 10204 Type I Error: 0.05 Type II Error: 0.05 Predominant Nuclide: Cs-137 Sample Area (m2): 6.84 Class 1 Scan Area (M2): 301.1 Scan Coverage (%): 100% Class 1 1.645 1.645 Sign P: 0.97725 Calculated Relative Shift: 2.1 Relative Shift Used: 2.1 Uses 3.0 if Relative Shift is

>3 N-Value: 12 Design N-Value + 20%: 15 NUREG-1575 Table 5-5 Design Min Samples N: 44 Class 1 Grid Spacing L: 2.6 Class 1 Page 3 of 9 FSS Summary Report F8130431

Survey Results:

A total of 47 direct measurements were made in F8130431. 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. Scan activity ranged from 1.895 to 35630 dpm/100 cm 2, based on a surveyor efficiency of 0.5 and no background subtracted. ISOCS scan activity on the walls and ceiling ranged from 2727 to 25855 dpm/100cm 2 for Cs-137 and all Co-60 scans <MDA.

Safnples 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 F8130431

Table 2. Direct Measurement Results Measurement ID Gross Activit (dpm/100 cm F8130431 -COOO1 BD 2132

.F8130431-CO002BD 1774 F8130431 -CO003BD 1556.

F8130431-CO004BD 1987 F8130431-CO005BD 1292 F8130431-CO006BD 1707 F8130431-CO007BD 3284 F8130431-CO008BD 2298 F8130431-CO009BD 1587 F8130431-CO01OBD 1525 F8130431-CO011BD 1686 F8130431-CO012BD 1577 F8130431-CO013BD 1592 F8130431-CO014BD 1499 F8130431-CO015BD 1489 F8130431-CO016BD 1499 F8130431-CO017BD 1515 F8130431-C0018BD 1390 F8130431-CO019BD 1421 F8130431-CO02OBD 1375 F8130431-C0021 BD 1240 F8130431-CO022BD 1100 F8130431-CO023BD 1255 F8130431 -CO024BD 1349 F8130431-CO025BD 1131 F8130431-CO026BD 1515 F8130431-CO027BD 1354 F8130431-C0028BD 1286 F8130431-CO029BD 1359 F8130431-CO03OBD 1582 F8130431-C0031 BD 1281 F8130431 -CO032BD 1255 F8130431 -CO033BD 1504 F8130431 -C0034BD 1515 F8130431-C0035BD 1359 F8130431-C0036BD 1769 F8130431-C0037BD 1572 F8130431-C0038BD 1432 F8130431-CO039BD 2106 F8130431-CO04OBD 1707 F8130431-C0041 BD 1572 F8130431-C0042BD 1567 F8130431 -C0043BD 1484 F8130431 -C0044BD 1556 F8130431-CO045BD 1587 F8130431-C0046BD 1473 F8130431-C0047BD 1458 Mean: 1565 Median: 1515 Standard Deviation: 352 Range: 1100-3284 Page 5 of 9 FSS Summary Report F8130431

Table 3. Removable Surface Activity Results

  • 1*

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

.4-F8130431C001SM 11.97 F8130431 C002SM 9.38 F8130431 C003SM 0.34 F8130431CO04SM 9.38 F8130431 C005SM 2:93 F8130431 C006SM -4.82 F8130431CO07SM 41.67 F8130431 C008SM 79.12 F8130431 C009SM 18.42 F8130431C010SM 8.09 F8130431 C011 SM -3.53 F8130431C012SM 23.59 F8130431C013SM -0.95 F8130431C014SM 0.34 F8130431C015SM 2.93 F8130431CO16SM -2.24 F8130431C017SM 1.64 F8130431C018SM -0.95 F8130431C019SM 8.09 F8130431 C020SM 1.64 F8130431 C021SM 4.22 F8130431 C022SM -0.95 F8130431 C023SM 0.34 F8130431 C024SM 17.13 F8130431 C025SM 17.13 F8130431 C026SM 5.51 F81 30431 C027SM 8.09 F8130431 C028SM 1.64 F8130431 C029SM 0.34 F8130431 C030SM -0.95 F8130431C031 SM 8.09 F8130431C032SM 1.64 F8130431CO33SM -0.95 F8130431 C034SM, 39.09 F8130431 C035SM 2.93 F8130431 C036SM 11.97 F8130431 C037SM 39.09 F8130431 C038SM 1.64 F8130431 C039SM 58.46 F8130431 CO40SM 9.38 F8130431 C041SM -2.24 F8130431 C042SM -3.53 F8130431 C043SM -2.24 F8130431 C044SM -3.53 F8130431 C045SM -0.95 F8130431 C046SM -4.82 F8130431C047SM -2.24 Mean: 8.75 Median: 1.64 Standard Deviation: 17.04 Range: -4.82 to 79.12 Page 6 of 9 FSS Summary Report F8130431

Survey Unit Data Assessment:

The survey design required 47 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 of 9 FSS Summary Report F8130431

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): 47 Median (dpm/100 cm 2 ): 1515 Mean (dpm/100 cm 2 ): 15.65 Direct Measurement Standard Deviation 352 (dpm/100 cm 2 ):

Total Standard Deviation (dpm/ 00 cm 2): 352 Based on samples and backgrounds.

Maximum (dpm/100 cm 2): .3284 Material Type: N/A Background Subtract Not Applied Sign Test Final NValue: 47 S+ Value: 47 Critical Value: 29 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 F8130431

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 potential areas 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 43000 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 F8130431 meets the release criteria of 10CFR20.1402.

Page 9 of 9 FSS Summary Report F8130431

Attachment 1 Maps June 23, 2008 Survey Unit F8130431

t'D CCMC J,

0 1tt

  • 0 Reflected Cellng

-, - N 97o YI!x I-ELEV-25"-

LEV-29g West Wel North Wag Surface Aree Estimates Reflected Celig -49.8 m?

East Wal -100.1 mnW North Wea -23.8 mJ Top t-1Z Bottom ef West Wal *97.8m' Top of -20 ottom of -20 Platform Shield Wall -29.5m'v

-12' Platform Platform Platform TOTALAREA = 301.1 rn?

00 w

UL) AUX. BLDG. PUMP ALLEY (ROOM 3.6)

NORTH OF COLUMN LINE 9.7

  • smu SACRAMENTO MUNICIPAL UTILITY DISTRICT GENERAL AREA SURFACE ESTIMATES F81 30431 -M1 DWG:. 81300.02d SHEET 1 of 1 T, C HILL

4:-

.. . .. .. L-H .. .. I+4 l ! 1 1 1 1 14 0

rr Tn

+-W+ H44h~I4T+I +4+4 -fil0h 4-4

+ - M_ X_

4 u+/- +ti-4-4+44+4-. -~I

+4444-I+4

+0444+/-4 4:

414y+4 H-414~A-

+444 1 8j1'8+1 44+44h +4 kE

-Hf- 4 A+/-+ 414 F-=Mr f+44 -q4 4644-1+-1 +4+- 4 H- -f4 H4- -

t -- w: 4 44 1 4T444 ~ O Wl

- --- A nHIL-

+

I IIIII11 m

1*4--

T

~~ ~ 1-rtvt

.~A/ii I t -f fr. ~. ~ ~~

i [

I -f-~-H-i-H-t-H j 1-4-4-4

+4- *+/-.+44-~1~

7 H-44-44-44~-H-44-44-44jH-4-jj

.... ......... *. __..o............... .. .[

,: X T .........-

  • 'T4-4-i--.-4-4.~I

-- f1*." 1 Ta4 4 T T t1 T Ta

- I 444 4 444,H ...... . . ., ... -44 "-4-4.444+,- .4-h' T:

ad Ce44j-" T + I!'"- -

00 4-1 - AUX BLDG. PUMP ALLEY NORTH OF 00

- =1°:i 201)1,*  : M COLUMN LINE 9.7 - BETA DIRECT/LOOSE

-_ACRM~s44I1:1 --------- I II 4---" I444+44 4-4;+44-':: OM-f4c2P, SURFACE ACTIVITY FS1 3RANDOM F81 0451-1 2 START LOCATION I IRt 2+-P- 4- -2i- n- or .- U ILITYDS

-.-- ______DWO: 81300 02d SHEET lof 4 "T C HILL

0 CIO REFLECTED CEILING uT1 SCALE AUX. BLDG. PUMP ALLEY NORTH OF I- = r.-& COLUMN LINE 9.7 - BETA DIRECT/LOOSE METER SCALE

  • smu SACRAMENTO MUNICIPAL SURFACE ACTIVITY MEASUREMENT LOCATIONS 0 1 2 3 UTILITY DISTRICT F81 30431 -M2 DWG: 81300.02d SHEET 2 of 4 T C HILL

CD (j)

EAST WALL ELEVATION 00 00 SCALE AUX. BLDG. PUMP ALLEY NORTH OF v-"

= 1-a' COLUMN LINE 9.7 - BETA. DIRECT/LOOSE METER SCALE

  • smun SACRAMENTO MUNICIPAL SURFACE ACTIVITY MEASUREMENT LOCATIONS 0 1 2 3 UTILITY DISTRICT F81 30431 -M2 IDW: 81300.02d SHEET 3 of 4 T C HILL

ELEV.-Z-O' 0

ELEV..12':0&

ELEV. -20'-0" i-Metmrhio" ELEV'. -25"-0" NORTH WALL ELEVATION ELEV. (T ShEICIS Wall Plo~

-12' Plallorm BfOUmOf

-12 Plalfono 00 l~.

SCALE mr-A JI-".

= I, o,'

V METER SCALE R~Jom '(

20 PlaIfton' 0 1 2 3 00 AUX. BLDG. PUMP ALLEY NORTH OF Inside of ShlWJWaSl Outslde of Shield Wall

(~SMUDSACRAMENTO MUNICIPAL COLUMN LINE 9.7 - BETA DIRECT/LOOSE SURFACE ACTIVITY MEASUREMENT LOCATIONS UTILITY DISTRICT F81 30431 -M2 CWG: 81300.02 d SHEET 4 of 4 T C HILL

0D

...4 0

REFLECTED CEINIG Gamma Scan Field of View 12.56 m2 00 ITj 0 SCALE AUX. BLDG. PUMP ALLEY NORTH OF COLUMN LINE 9.7 - CEILING METER SCALE

  • ) SACRAMENTOMUNICIPAL GAMMA SCAN LOCATIONS 0 1 2 3 UTILII Y DISTRICT - F81,30431-M3 1,300.02d "SHEET 1- of4T C HILL DWG: 8 DWG: 81300.02d SHEET I- of 4 TC HILL

CD 00 00 uJ Gamma Scan Centered at One Meter will be Evaluated in F8130441 EAST WALL ELEVATION Gamma Scan Field of View 3.14 m2 0

SCALE.

AUX. BLDG. PUMP ALLEY NORTH OF COLUMN LINE 9.7 - EAST WALL METER SCALE

  • SMUD SACRAMENTO MUNICIPAL GAMMA SCAN LOCATIONS 0 1 2 3 UTILITY DISTRICT F8130431 -M3 DWG: 81300.02d SHEET 2 of 4 T C HILL

0 Gamma Scan Centered at One Meter will be WEST WALI ELEVATION Evaluated in F8130441 2

Gamma Scan Field of View 12.56 mn IT1 00 AUX. BLDG. PUMP ALLEY Uo SCALE 4" N O NORTH OF COLUMN LINE 9'7 - NORTH AND 1"= 1.,0" METER SCALE WEST WALL GAMMA SCAN LOCATIONS SACRAMENTO MUNICIPAL 0 1 2 3 UTILITY DISTRICT F81 30431 -M3 SHEET 3 of 4

ELEV. -12'-0' CD ELEV. -25'-91 ELEV. -29'4Y' North Wall Inside East Wall Iside Shield Wall Shield Wai SG)

K SCALE

.16 = 1,-0".

North Soth METER SCALE door Facings 0 1 2 3 00 AUX. BLDG. PUMP ALLEY wJ Top of 8011M Of

-2()-( Platfoom -20'-0"Elaforrn NORTH OF COLUMN LINE 97 SHIELD WALL BETA SCAN LOCATIONS SACRAMENTO MUNICIPAL UTILITY DISTRICT F8130431 -M3 DWG: 81300.02d SHEET 4 of .4 T C HILL DWG:8130.02dSHEE 4 o .4T C HILL1

CD (tNv O0 I,

N-ý North Wall Elaqilofr r

K*iL2*V2 /

A/7 ns1oo o3!Sheld Wal Outsido ot.Shied Wal F8130451-M2 Sheet 1 Reflected Cek"q

-!2101aPJdnn Bottom of

-17 Platform West Wall 00 0

w* AUX. BLDG. PUMP ALLEY METER SCALE

-20' Platfom Bottom of

-20' Plattorm'

  • s ma SACRAMENTO MUNICIPAL NORTH OF COLUMN LINE 9.7 JUNCTURE BETA SCAN LOCATIONS UTILITY DISTRICT F8130431 -M2 0 1 2 3 DWG: 81300.02d SHEET lof 2 T C HILL

0 NorthWall Inside East Weains4-r shield Wall 'Shield Wall c7j~

~(23 (4

(

SCALE

= 16-O" North South METER SCALE Door Facings

-- 0-9 0 1 2 3 00 wb Top of Eottomol AUX. BLDG. PUMP ALLEY

.20,COPlatform -20 O0Piaftorm NORTH OF COLUMN LINE 9.7 JUNCTURE BETA SCAN LOCATIONS SACRAMENTO MUNICIPAL UTILITY DISTRICT F8130431 -M4 DWG: 81 300.02d SHEET 2 of 2 C HILL T

Attachment 2 Instrumentation June 23, 2008 Survey Unit F8130431

Table 2-1. Survey Unit Instrumentation Instrument Detector MDC Static MDC Scan Model; Serial No. Model; Serial No. (dpm/100 cm 2 ) (dpm/100 cm 2 )

M2350; 203486 43-68B; 161400 433 1033 M2350; 149789 43-68B; 161397 M2350; 149789 43-116-1B; 256006 796' 3258' Tennelec; 0401171 .N/A 6 dpm a, 12 dpm 13 N/A Juncture - concrete Instrument Detector MDC' Model; Serial No. Model; Serial No. (dpm/100 cm 2)

ISOCS 1983920 1370 (Co60) 1320 (Cs137) 2 3920_2mconcrete geometry 12 m FOV Table 2-2. Investigation Criteria and DCGL Value Parameter (dpm/100 cm 2 )

Val uec2 Investigation Criteria - Direct 154566 Investigation Criteria - Scan 154566 DCGLW 43000 DCGLEMC 154566 Value (dpm/100 cm 2 )

To detect a I m hot spot at the EMC riterion within the detector field of view 63,300 dpm/100 cm 2 Cs-137 21,275 dpm/100 cm 2 Co-60 1 3920 2m-concrete geometry 12 m2 FOV 2 2 Investigation Level set to 43,000 dpm/1OOcm Cs-137, ND Co-60 for investigation survey instructions.

Page 2 of 2 Att. 2 Instrumentation F8130431

Attachment 3 Investigation June 23, 2008 Survey Unit F8130431 (none required)

Attachment 4 Data Assessment June 23, 2008 Survey Unit F8130431

F81 30431 Gross Activity Sample Results Quantile Plot DCGL = 43000 dpm/1 00cm2 3,500 3,000 2,500 I

2,000 1,500 1515 CD2 1,000 500 0 -t.

0 20 40 60 80 100 Percentile 00 I

  • Direct Measurements (dpm/100cm2) -median - - - 75th Percentile ---- 50th Percentile i C0

0*

F8130431 Gross Activity Sample Results Scatter Plot DCGL = 43000 dpmll00cm' 3500 .

0 3000 E 2500 a 2621 u2500 C0 0 0 0 2000 0 CL 0 0 0 0 0 V0QQ 0- -._.Oý -0 ___ O___

>1500 I0 -'7o 000 0&o 0 0 10 C00 -a 00 0 0 0 0 CA0 0

,1000 CDC 500 -. -a -a a a a a a a a a a a a - a a a a a a a- a a 509 00000 0000000000000000000000000000000000o0Av -00 00' 00000000000000000000 0 0 t*O0000 0t 00r O00000000tJ00000 00 Meas urement Locations

.-. ~i o Gross Activity "-- Average a - "+3StDev" a - "-3StDev"

. C A. . . . .. .. .. . . . * .- . . . . . . . ... . ..  : :::: :1:: :: : : . :: ::: : ::: : .: :: :: :: :  : : : : :- -::: 1 -:::: : : : : : : : : : :: :: : :: :: :: : : :: : :  : : : : : :: :  :: :: : : ::  :.

41, 0 F8130431 Gross Activity Frequency Plot Ab DCGL = 43000 dpm/1 00cm2 28 26 24 a- 22 20 18 I

A C 16 L.o CD 14 12 10 8

6 4

2 0

CO)

I-O Cl

('4 Cl Cr) 00 0 Bins - Upper End Value (dprm/100cm2) 4A

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