ML082620093

Final Status Survey Summary Report, June 24, 2008, Non-Controlled Rooms in the Auxiliary Building Elevation 20, Survey Unit F8131411

ML082620093
Person / Time
Site:	Rancho Seco
Issue date:	06/24/2008
From:	Stein M Sacramento Municipal Utility District (SMUD)
To:	NRC/FSME
References
MPC&D 08-064
Download: ML082620093 (62)

Text

Rancho Seco Final Status Survey Summary Report June 24, 2008 Non-Controlled Rooms in the Auxiliary Building Elevation 20' Survey Unit F8131411 Prepared By:

Date:

FSS Engineer Reviewed By__

Date: & 13o0/B Lead FSS Engineer Approved"By:

Date:_

Dismantlement Superintendent, Radiological

FINAL STATUS SURVEY

SUMMARY

REPORT Survey Unit:

F8131411, Non-Radiological Controlled Rooms in the Auxiliary Building Elevation 20' Survey Unit

Description:

Operating History: The Auxiliary Building was 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. This survey unit includes most of the non-radiological controlled rooms in the Auxiliary Building on elevation 20'. The room numbers included in this survey unit are 212, 213, 214, 215, 216, 217, 218, 219, 220, 223, 224, 225, and 226.

Site Characterization: Direct measurements were taken on the interior surfaces of the non-radiological controlled rooms in the Auxiliary Building (elevation 20'). Direct measurements showed a mean gross activity level of 1,838 dpm/100 cm 2 and a maximum value of 2,119 dpm/100 cm 2 on the floor and lower walls. Direct measurements on the upper walls and ceiling showed a mean gross activity level of 1,791 dpm/1 00 cm 2 and a maximum value of 2,275 dpm/100 cm 2. Based on the classification procedure (DSIP-0020) and the levels of gross activity reported, the interior surfaces of the survey unit were determined to be a Class 3 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 randomly determined and 239 m2 were scanned for approximately 5%

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 F8131411

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 cm2):

LBGR (dpm/100 cm 2):

Design Sigma (dpm/100 cm2):

Type I Error:

Type II Error:

Predominant Nuclide:

Sample Area (m2):

Scan Area (m2):

Scan Coverage (%):

Zl-a :

Sign P:

Calculated Relative Shift:

Relative Shift Used:

N-Value:

Design N-Value + 20%:

Design Min Samples N:

Grid Spacing L:

1411 3

4546 Michael Stein 43000 N/A N/A 21500 243 0.05 0.05 Cs-137 N/A 239 5%

1.645 1.645 0.99865 88.4 3

11 14 14 N/A Non-Controlled Rooms in the Auxiliary Building Elevation 20' Structure Surface LTP Table 5-4 Gross Activity DCGL Class 3 Class 3 Default =,50% DCGL Class. 3 Class 3 Uses 3.0 if Relative Shift is

>3 NUREG-1575 Table 5-5 Class 3 Class 3 Page 3 of 8 FSS Summary Report F8131411

Survey Results:

A total of 14 direct measurements were made in F8131411. 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 1,548 to 13,975 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 (dpmll00 cm F8131411 -CO001 BD F8131411 -CO002BD F8131411 -CO003BD F8131411 -CO004BD F8131411-COOO5BD F8131411-CO006BD F8131411-CO007BD F8131411-CO008BD F8131411-CO009BD F8131411 -COOIOBD F8131411-Co01 I BD F8131411-CO012BD F8131411-CO013BD F8131411-CO014BD Mean:

Median:

Standard Deviation:

Range:

830 1452 1411 1369 1401 1395 1271 1504 965 1572 949 1115 1240 892 1240 1320 246 830 - 1572 Page 4 of -8 FSS Summary Report F8131411

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

F8131411 C0001 SM F8131411C0002SM F8131411C0003SM F8131411C0004SM F8131411 COOO5SM F813141 1 C0006SM F8131411 C0007SM F8131411 C0008SM F8131411 C0009SM F8131411CO010SM F8131411CO011SM F8131411Coo012SM F8131411C0013SM F8131411CO014SM Mean:

Median:

Standard Deviation:

Range:

-4.82

-3.53 0.34

-3.53

-3.53

-2.24

-4.82

-2.24

-0.95

-0.95 0.34

-2.24

-3.53

-3.53

-2.52

-2.88 1.69

-4.82 to 0.34 Page 5 of.8 FSS Summary Report F8131411

Survey Unit Data Assessment:

The survey design required 14 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 greater than the design standard deviation. Since both values of sigma resulted in a relative shift greater than three (3), no additional samples were required.

Page 6 of 8 FSS Summary Report F8131411

Table 4. Data Assessment Results Survey Results Parameter Value__

Comment Material Background Used (dpm/100 cm 2):

Ambient Background Used (dpm/100 cm2):

Actual Direct Measurements (N):

Median (dpm/100 cm 2):

Mean (dpmIO00 cm 2):

Direct Measurement Standard Deviation (dpm/100 cm2):

Total Standard Deviation (dpm/100 cm2):

Maximum (dpm/100 cm2):

Material Type:

Sign Test Final N Value:

S+ Value:

Critical Value:

Sufficient Samples Collected:

Maximum Value < DCGL:

Median Value < DCGL:

Mean Value < DCGL:

Maximum Value < DCGLemc:

Total Standard Deviation <= Sigma:

Pass the Sign Test?

Reject the Null Hypothesis?

Does the Survey Unit Pass All Criteria?

N/A N/A 14 1320 1240 246 246 1572 N/A 14 14 10 Yes Yes Yes Yes N/A Investigate Yes Yes Investigate Average Ambient BKG = 0 Based on samples and backgrounds.

Background Subtract Not Applied Class 3 No additional samples required.

No additional samples required.

Page 7 of 8 FSS Summary Report F8131411

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), the ALARA criterion has been met.

Changes in Initial Survey Unit Assumptions:

The survey unit was designed as a Class 3 structure survey and the sample results are consistent with that classification. The variability of the survey results was greater than

-thie characterization data used for survey design. However, no additional samples were required. No potential areas of elevated activity were detected

==

Conclusion:==

The FSS of this survey unit was properly designed as a Class 3 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. 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 F813 1411 meets the release criteria of 10CFR20.1402.

Page 8 of 8 FSS Summary Report F8131411 Maps June 24, 2008 Survey Unit F8131411

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ELEV. 20'-V M4ETERS AUXILIARY BUILDING EL 20 ROOM 214 FLOOR PLAN BETA SCAN, MEASUREMENT LOCATIONS F813141 1-MI

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REFLECTED CEIUNG PLAN E"E. *9°-0" AUXILIARY BUILDING EL 20 ROOM 214 REFLECTED CEIULG" PLANS

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.BETA SCAN SMEASUREMENT LOCATIONS F813141 1-Ml 0

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,BETA SCAN:

MEASUREMENT LOCATIONS F8131 411 -MI

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ISCALEa HETERS

.. AUXILIARY BUILDING EL 20 ROom 217 RtElCTED CEIUNG PLANS BETA SCAN MEASUREMENT LOCATIONS F81.31 411 -MI

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BOXES REMJAINED IN PLACE.

scm iEmAREUENT LorA11N kwt.

NEED T70 9E A6DJUSTED IN THE FIEO TO, ACCOMMODME-M"IT EGVFUENT&.

ELEV LKG SOUTH ELEV. LKG WEST "10 00 S~AWMENTO. MINIMIAL

~~

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MOTOR CONTROL OABINETS AND, ELECTRICAL.

BOXES REMMAINE HI fACE.

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.,BETA SCAN.,

MEASUREMENT LOCATIONS F8t13141 1-M I 0

SCALE?

METERS

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FIELD'TO /AC0MMOtD6TE INSTIlJ EQUFi~kIEH.

00 a

1 2

SCAE (9 AUXILIARY BUILDING EL 2C ROOM 224 FLOOR PLAN

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(D~

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CICIAMNDR

_SCAN ESR LCTN MW-~ NEED TO!,BE ADJUSED N niE FIELD TO ACCOMMODiATE ffdtl EOUII'ENT.

ROOM 224 UPPER PLAN BETA SCAN MEASUREMENT LOCATIONS F813141 1 -MI SHEET.2$ of 31

0'J 00 NOTES:

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00 ROOM 224.STRUCTURAL CEIUNG REFLECTED PLAN BETA. SCAN MEASUREMENT LOCATIONS F81,31411-M1

0O Io 00 HrnT~4~ I 0

i EL IWN9 NOTES:

1, AT TlikOF 00 MP DINELOPAENT AND W-*OUTPJnREMAJNEO UE*

PL,.

SCN TOhURdN r=TON MAY.

NEEIDTBE ADJJE IN T FIELD TO ACO MMOWATE INSITU EQUPWT,"

ROOM 224 WALL ELEVATIONS BETA SCAN MEASUREMENT LOCATIONS F813141 1-MI 0

1 2

3 SCALE METERS1

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(D~

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MEASUREMENT LOCATIONS S

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. Ar 1imE oF~ Fss W44 oe~apEmrft PIPMO. LIGHTS. C.UT. ELECMIAL.

GOXESIAW HWC DUCrWIUAo EINMN.

PAE.SCAN*

ME6SROgNT LOCATU3N EE1

, D TO. BE ADAISrED IN THE FEL V

TO ACCWOIAOqAE W=fl EQFMM.

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/7 z

/

7

/VNWi I

I I

I I

A: I I 1 REFLECTED CEILING PLAN 0'2.4.6.81 SCALE e

ROOM 225 FLOOR & CEILING PLANS

-BETA SCAN MEASUREMENT LOCATIONS F8131411-MI

cIQ 00 uj~

ELEVATION: LOOKING. SOUTH

.AT COL LiNE 9.3 1, AT flME F.

M W.

MUMMEWO'A

= C oucnma~4LuJfl, c$8aLE.TI~tA~y~s SOAW MEASIJREMD4T LbCkTWS -MAY.

NEEDl TO 1E AM1J9O W4 THE FiELD TO A000Mi0iMTE INMW EQUAPMENT.

ROOM 225 WALL, ELEVATIONS BETA SCAN MEASUREMENT LOCATIONS F813141 1-MI 0

1 2

3 SCALE McTERn

rio M H 49T!

i

........ K V"""V MIT HHH.

0 f i i i i i i i eel i H i MH IF

+

LAK:

IEW11 23 LIM:-

vn"M,

tKC*F H HH,

OA 45; scQ-E;

'AUXILIARY BUILDING EL 20' ROOMS 212. -' 220, 223ý216 SMUD DIRECt\\LOOSE SURFACE ACtMTY MEASUREMENT LOC411614S SAMMEWO MUNICIPAL UnLny DwrdcT FBI 31411 - M 2.

R.L 1113006.04c SHEEr 1 of 15 RC RAYMOND 00

0 l

t i

--,M Hitk-

=;:?,~~"'ij

':!::ZIOi'::;:

RORA22 26 KY"

/U IIR BU LD G SL 2 i: ::'"",.*..........

T.rr k E I OC TI N RQ 5

ENT: MNICIALA RZF_.:8*300.0*

SE* 2.0*

5 R RAYONF 00 A

4 s

4 7

.1

0 FUR EL, 2V0-0 MJux1IAwy KtE LAN~

¶ý ATIM 1140 bfS M J

&,CP'e~lop4J PwPmO U014T$,,0ONDUT. ELE17TRICAL BOXES

AMi WVi 65566~ IFMAAMAN

FLACE, W-SM&EA24 LoC6J~h WY' NEW,TOB8E,,'AJUS1TE3 IN n(E: FIELD T ACCOMMOMAE NSW1 EOVIFtENt.

aELE. 2V-O' I'll 00 w,

AUXILIARY BUILDING EL '20:

ROOM..224 FLOOR PLAN"_

BETA DIRECT/LOOSE SURFACE MEASUREMENT LOCATIONS F81314 11 - M 2 0

1 2

SCALE MUETRS

(D 0

Aý KEY PLANS NO)TES:

V -Al TIME OF M AP MODfVLPMENT UOKTS. COND

. tT, cAsLE lih6ys, molDS 00WRDLJ C~O~aS. M D ELECTIChAL BOXES 0MI6NIED IN. PLACE MEASUREMEN4T LWAT*W Mk WED.NETo M ADJUSTIED INTWFEWLD T AGOUMOOX4H UIMIT EQLWENT.

PLAN YIE ELEV. 20'-0 00 A.

o SCALE~

METErs

-ROOM 217 FLOOR PLAN BETA_ DIRECT/LOOSE MEASUREMENT MEASURtEMENt LOCATIONS F8.131 411 -M2

CD i-Q FLR EL KEY PLANS

1. ATJ1UE oK ml wV.P Dm~lf4Etf PIPM.O. CONTR. OO N.

CAM ELECMAt. BOXES9:.R B

ED-fNAPLA,.

MEARiENT. L00Afl0*kW.* :NEED TO BE ADO$I

.THE :-e'D.TO

,ACOMMOWE WS"T EU*PMENr..

PLAN VIEW W-Y. 20"-.0-00 SCALE ME~TERS ROOM 220 FLOOR PLANS BETA DI RECT/LOOSE. SU R FACE MEASUREMENT LOCATIONS F81 31411 -M`2

CQ w

00 0

C,,

0>

NOTES

1. Ar inhE OVM:ýk"WýfDEVEIOPM4ENT MOTOR:

C0NROL &ik AM:

ELEC1RWcAL DCXE AWfAiNE 6I PL.ACE.

MEAMURBENr L0O10N=MM fNED BE ADJUSTED IN THE n EAL WDT T A~OChADMATE INSrU. EQUIMENT.

LOOKING WEST ELEY. 2D'A 0 1SCALE METERS AUXILIARY BUILDING EL 20 ROOM.:220 LOOKING WEST BETA DIRECT/LOOSE SURFACE MEASUREMENT LOCATIOHS:

F81.31411-M12

CD w

11 00

2 "J

• PLANYIEW.

REFLECT.CLG 'IEW'

,EV0 2r-o' ELY.

A2-014

/0 FLJ i~W-Auam PLA

\\1 REFEC QN EL 210'-"

ELEV LKG NOR ELEV LKG EAST ELEV LKG SOUTH ELEY LKO. WEST NOTES;

1. ATMME O AUXIUARY..BUILDING EL 20 00 SMUD ROoM 2165 FLOOR. CEILINS G & WALLS ACTAI~iBETA DIRECT/LOOSE SURFACE DAY ED.T

_ _R_"_'-.

M RA MEASUREMENT LOCATIONS BE* AD!WED..OIN Tn.R IELID T 0

1 a

3 SACRA)ENTO.MUNICIPAL 3...

ACCOMMODATE WS

.U EGUPMED,.

SCALE UTUY MCT F81.3.14D11 ý-MS2

_L-

0 0i0 ujD 1.. AT lME O FM' WJ' :VEIoENT ULHTS, COMMvr CARLErM, Id6TOR.

MEAMuREME M LWAIIUTM:t kWEDW TO SE.AOJUST WTHE:.FlELD10 ACCOA)DH W

EOIAMENF.

REFLECTED CEIUNG PLAN E". 3-o SCALE3 METERS ROOM 217 REFILECTEI) CEILING PLANS BETA DIRECT/LOOSE SURFACE ACTIVITX-MEASUREMENT LOCATIONS F81 31411 -M2 1

00 w~

U' I

'I Auxalwy BLDG KEY LANA NTES:~

1; At ITLE O FS MMAP DEVELPPMEN F~1OM UOHTS%

00NIMT CMAE TR&1S.

IJOTR CONEROI CABtW1 AM~f ELECTRtCA BOXES RO~ANED IN RAT-~

mEASREmENr LoGA1ToU kmm(NE To BE ADJUSTE IN THE FIELD ITO AtCOUIAOOAE KlSBU EOUIPMENr.

m--

REFLECTED~ CEILING VIEW t",A 29'-0O 0

1 2

3 METErS ROOM. 220 REFE*CTED CEILUNG PLANS BETA*. DIRECT/LOOSE SURFACE MEASUREMENT LOCATIONS F81 314iV-M2

(0 0

1; AT lIME O'FS M WP DENLOftJEN PIPNG WK14S. 00NWUT. fEUTP4CA ammE mmO HWAC OUClO REMAIANED PLhcE WASURDOU LOC~flOU W,

NEED TO8E.AOMUSTED IN TrE.FEID TO C~A00m4OtTE WSWT EDVIPMENT.

00 ROOM 224 UPPER PLAN BETA. SCAN MEASUREMENT LOCATIONS F813141 1-M2

(D 0

ELEV LKG. NORTH

.ELE LKG EAST NOTES:

1. AT lIME OF FSS MkP MDI)MENT UIOH78ý CONlDtA. MOID ý CONoIRa CABEM AMD ELECTM~,

BOM REMAMNA N PUCE..

MEASUREIAENT, LOCAIMOS MAY NEEDIM R:E ADMMJ~E INTHE, FiEw To AC3M0OA1INw1 EOIJIPEIJT.

ELEV LKG SOUTH 00 ROOM 213 WALL ELEVATIONS BETA DIRECT/LOOSE SURFACE MEASUREMENT LOCATIONS F81 3141 1-M2 0

1 a

3 SCALE METERS

CD 0T ftR.EL 2-14'-

KEY PLAN PLAN VIEW D.E'v. 2c-o" REFLECT CLG' VIEW ELE=V.

3-oT 7-V

===*

• 1 i:

ELEV LKG NORTH ELEV LKG EAST ELEV LKG SOUTH ELEV LKG WEST

1. ATýn OfM FM W~MP OBXLOPMENT BOES.REMAM INI PIACE WEASUKUMIOtCAWNOS MAY NEW TO BEA~UTDIN THE FIEL M Acn=.W$M~t EO MM 0

1 2

3 SCALE SMETR ROOM 2,16: 'FLOOR, CEILING:&.WALLS BETA.DIRECT/LOOSE SURFACE MEASUREMENT LOCATIONS F81 31 411 -M2 ooo.o04 SHEET 13 o( 15 RC F

CD

-'-1

.EL 30 "-9C C'IUN IIrI

ý00 w-1, AT TWrl OF~ F5ýW -~DUREOMjAEN MEk.tStJD41N' LOMTIOU: M~AYý HM TO BE ANoLEOM I.TK E

1VE A0=L1U0A1E INSITU, EW'U~T.

ROOM*224. WALL ELEVATIONS BETA DIRECT/LOOSE. SURFACE MEASUREMENT LOCATIONS FF8 131,411 -M,2 0~

1

.2 3

SCALE MCMM~

00 ELEY 1KG NORT AT MO 19, ELEvATION LOOKING: ET ELEY LKG EAST AT COL f(.1

ýELEV 1KG SOUT NOTES AT C0L 10.

1, AT TW1 ýOP F35 W~ £EYELOPMENT If"'G &'W

'DI co FIEWM IN1~C' MIACE. WkMEASUENT LOCATIOPS MY.

NEED 70 E A0JSTED IN THE FIED -O AC0bMLIODT1E INSM1 EQA3MEMT.

ELEV LKG WESI AUXILIARY BUILDING EL 20, ROOMS 223 & 226 WALL ELEVATIONS-BETA DIRECT/LOOSE SURFACE MEASUREMENT LOCATIONS F813141 1-M2 0

1 a

3 SCALE WiETERS Instrumentation June 24, 2008 Survey Unit F8131411

Table 2-1. Survey Unit Instrumentation Instrument Detector MDC Static MDC Scan Model; Serial No.

Model; Serial No.

(dpm/100 cm2 )

(dpm/100 cm2 )

M2350; 203486 43-68B; 190476 433 1033 M2350; 142509 43-68B; 160699 433 1.033 Tennelec; 0401171 N/A N./

dpA aN 1

11.7 dpmf

_1_

Table 2-2. Investigation Criteria and DCGL Value Parameter dp lue cm 2)

(dpm/100 c2 Investigation Criteria - Direct 21500 Investigation Criteria - Scan 43000 DCGLw 43000 DCGLEMC N/A Page 2 of 2 Att. 2 Instrumentation F8131411 Investigation June 24, 2008 Survey Unit F8131411 (none required)

Data Assessment June 24, 2008 Survey Unit F8131411

00 wj F8131411 Gross Activity Sample Results Quantile Plot DCGL = 43000 dpm/1 00cm2 I

1,800 1,600 1,400 1,200 1,000 800 600 1320 400 200 0

0 20

40.

60 80

. 100 Percentile I

• Direct Measurements (dpm/lO0cm2)

-median

- -75th Percentile 50th Percentile

(b 0

PF8131411 Gross Activity Sample Results Scatter Plot DCGL 43000 dpmllO0cm' 2500.

E 2000 -

a a a a a a -

a a - - -

a - -

a -

a - - - -

1979 0

81500 0

0 0

• a 0

-'o 1240 1000 0

o o

CD) 5 0 0 0

Ci2 0

I I

000000C 000 00 o

a 00 Measurement Locations 00]

I o

Gross Activity -

Average a

- "+3StDev" -

-"-3StDev"

0 cjt CD cj4 F81 3141,1 Gross Activity Frequency Plot DCGL = 43000 dprn/1 00cm 2 4-9.

U-a 0

3-2-

0-04 C\\I

(~)

I.-

0)

I~5 00 Bins - Upper End Value (dpm/1 00cm2)