ML081610318
| ML081610318 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 03/24/2008 |
| From: | Sacramento Municipal Utility District (SMUD) |
| To: | NRC/FSME |
| References | |
| MPC&D 08-032 | |
| Download: ML081610318 (25) | |
Text
Rancho Seco Final Status Survey Summary Report March 24, 2008 Corridor Auxiliary Building, Elevation 20', (Room 207)
Survey Unit F8131361 Prepared By:-A l Date:
e Reviewed By:
,K...*,
neer Date:-si Lead FSS Engineer Approved By:
Date:
Dismantlement Superintendent, Radiological
FINAL STATUS SURVEY
SUMMARY
REPORT Survey Unit:
F8131361, Corridor Auxiliary Building, Elevation 20', (Room207)
Survey Unit
Description:
Operating History: The Corridor of the Auxiliary Building on elevation 20'is located in the non-radiological controlled section of the Auxiliary Building.
Site Characterization: Mean gross activity levels for the non-radiological controlled sections of the Auxiliary Building ranged from 1,658 to 1,980 dpm/100 cm2. Based on the classification procedure (DSIP-0020) and levels of gross activity reported, the interior surfaces of the Corridor of the Auxiliary Building on elevation 20' were determined to be a Class 3 area.
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 85 m2 were scanned for approximately 10%
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 F8131361
Table 1. Survey Unit Design Parameters Survey Design Value Comment Parameter Survey Area:
Survey Unit:
Class:
SU Area (m2):
Evaluator:
DCGL (dpm/100 cm2):
Area Factor:
Design DCGLemc (dpm/100 cm 2):
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 (%):
Zj-" :
ZI-P :
Sign P:
Calculated Relative Shift:
Relative Shift Used:
N-Value:
Design N-Value + 20%:
Design Min Samples N:
Grid Spacing L:
F813 1361 3
842 Michael Stein 43000 N/A N/A 21500 5461 0.05 0.05 Cs-137 N/A 85 10%
1.645 1.645 0.99865 3.9 3
11 14 14 N/A Corridor Auxiliary Building, Elevation 20',
(Room 207)
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 F8131361
Survey Results:
A total of 14 direct measurements were made in F8131361. 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 2810 to 6668 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.
Table 2. Direct Measurement Results Measurement ID Gross Activity (dpm/100 cm F8131361-COOOIBD F8131361-C0002BD F8131361-C0003BD F8131361-CO004BD F8131361 -COOO5BD F8131361-CO006BD F8131361-Co007BD F8131361 -CO008BD F8131361-CO009BD F8131361-Co01OBD F8131361--Co011 BD F8131361-Co012BD F8131361--Co013BD F8131361-CO014BD Mean:
Median:
Standard Deviation:
Range:
1795 1504 1426 1245 1401 1442 1525 1468 1551 1276 1364 1598 1354 1411 1454 1434 140 1245-1795 Page 4 of 8 FSS Summary Report F8131361
Table 3. Removable Surface Activity Results Measurement ID Surface Beta Activity (dpm/100 cm 2)
F8131361 C0001 SM F8131361 CO002SM F8131361 C0003SM F8131361 C0004SM F8131361 C0005SM F8131361 C0006SM F8131361CO007SM F8131361 C0008SM F8131361CO009SM F8131361.CoolOSM F8131361COO11SM F8131361C0012SM F8131361 CO013SM F8131361 CO014SM Mean:
Median:
Standard Deviation:
ý Range:
-0.95
-0.95
-3.53 0.34
-2.24
-0.95 2.93
-3.53
-4.82
-0.95
-3.53
-2.24
-4.82
-3.53
-2.05
-2.24 2.14
-4.82 to 2.93 Page 5 of 8 FSS Summary Report F8131361
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 less than the design standard deviation so no additional samples were required.
Page 6 of 8 Page 6 of 8 FSS Summary ReportF8316 F8131361
Table 4. Data Assessment Results Survey Results Parameter Value Comment Material Background Used (dpm/100 cm 2):
N/A Ambient Background Used (dpm/O00 cm2):
N/A Average Ambient BKG = 0 Actual Direct Measurements (N):
14 Median (dpm/100 cm 2):
1.434 Mean (dpm/100 cm2):
1454 Direct Measurement Standard Deviation
.140 (dpm/100 cm2):.
Total Standard Deviation (dpm/100 cm 2):
140 Based on samples and backgrounds.
Maximum (dpm/100 cm 2):
1795 Material Type:
N/A Background Subtract Not Applied Sign Test Final N Value:
14 S+ Value:
14 Critical Value:
10 Sufficient Samples Collected:
Yes Maximum Value < DCGL:
Yes Median Value < DCGL:
Yes Mean Value < DCGL:
Yes Maximum Value < DCGLemc:
N/A Class 3 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 F8131361
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 less than the characterization data used for survey design. 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 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 F8131361 meets the release criteria of 1 OCFR20.1402.
Page 8 of 8 FSS Summary Report F8131361
Attachment I Maps March 24, 2008 Survey Unit F8131361
C"D 0
0 00 NOTES:
- 1. AT TAIE oi mS
,Ap ae',ELopmEw "rLH1s
- CONDoUIT, ELETRICAL. BOXES ANDI Pwtic RO,/,ANED. IN.PLACE.
- ETA DIRECT MAEAS-IRIJl'1 0
1 2
3 LOCAliONS MAY NEED TO BE AUED) IN THE SCALE FlEW TO: ACCOODATE INSITU EQUIPMENT.
HETERS AUXIUARY BUILDING EL 20 ROOM 207 FLOOR PLAN BETA DIRECT/LOOSE SURFACE ACTIVITY MEASUREMENT LOCATIONS F81 31361 -M2 1300004o SHEET 2 of 5 RC Rg
0 EL 4,0'-
1
.2 EL 20*-0' VIEW LOOKING SOUTH AT-OL LINE 16.0 1
VIEW LKG WEST NEAR COWLINE H VIEW LOOKING NORTH AT-OL.UNE.10.3
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AT COL LINE 10.6 1111111,1111111i" 00 N OTES:
- i. AT -IME-oF FSS MAP DevE-, PMENfr u"TS CONDUIn, ELECIAL BOXES AND PIPING ROMINID IN PLACE. BETA DIRECT MEASUREMENT LOCATIONSý MAY NEED TO BE ADJUSTED IN THE FIELD TD.ACCO*ODAE INSIrU EQUIPMENT.
Au PMENTO D
ISTRICT UTILIY DISTM AUXILIARY" BUILDING EL 20 ROOM 207 WALL ELEVATIONS BETA DIRECT/LOOSE 'SURiFACE ACTIVITY
-MEASUREMENT. LOCATIONS SF81 3136.1 -M2 0
1 2
3 SCALE HETERS FIL[* RI.
NYMOND FILE: It!_NM 04a SHEET 4.6t 5 RC
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SMUD SACRAMENTO MUNICIPAL UTILITY DISTRICT AUXILIARY BUILDING EL 20 ROOM 207 WALL ELEVATIONS BETA DIRECT/LOO0SE SU RFACE ACTIVITY MEASUREMENT LOCATIONS F8131361 -M2 W50.O SHESET 5 of 5 FLE: 81:
AYMMONE FILE: 81
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00 w*
NOTES:
I. AT TuE OF FSS MAP
,l"DPMEr
- UQ4TS, CONOJJfr. EL.ECTRICAL a0xM AND. PIPING RDMNMt) IN PLACE. SCAN K4EASUREk4ENT LOCAllONS MAY NEED TO BE A-L.TDU) IN THE FIELD 7D ACCOWICAE. INSITU EQUIPMEhT.
AUXIUIARY BUILDING EL 20 ROOM 207 FLOOR PLAN BETA SCAN MEASUREMENT LOCATIONS F8131361-MI SHEET 1 of 5
CD REFLECEc'*D PLAN VIEW ELH K9'2 REFLECTED. PLAN VIEW EL. 39'-:2' IAUXILIARY BUILDING EL 20.
NOTES:
ROOM 207 REFLECTED CIEIUNO PLAN
- i. AT TWE OF FSS MAP [evaOfMENr UQsTm, BETA SCAN CONDU...
ELECRICAJ BOXES AND.P..
sA u
m, MEASUREMENT LOCATIONS REMANED IN, EL ACT*
CA N MoEsASRMN T
0 1
2 3
SACPM ENTO MUNICIALI RDtIEINPLC.
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hE, o
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- -u F81 31 3 61 -K 1 LOCATIONS MAY NED TO BE ADJJUSTED W THE scALE UTIY DSTRICT F81_31_3_61_-_MI TO TDACCOOTE INS_
EQUMENT._
_ETERS FLEU 51300004a SHEET 2 of 5 RC RAYMOND tO uj w*
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VIEW LOOKINO NORTH AT COL LINE 10.3 NOTES:
- i. AT TAE oF m MAP or* EL*-
- uLIT, CONO.A, ELECrI*CAL GOXM, AND PIPING RDAMiN IN PLACE
- ErA DRECT MESREMD, LO.ATIONS MY NEED TO BE ADJUSTED IN THE IEW TD ACC._OIOAE INSI' ECQURUENT.,
smu BETA 0
1 2
- 3 SACRAMENTO MUNICIPAL SCALE UTILfTY DISTRWT HETERS FILL-B13000.04o AUXILIARY BUILDING EL 20 ROOM 207 WALL ELEVATIONS DIRECT/LOOSE SURFACE ACTIVITY MEASUREMENT LOCATIONS F8131361 -M2 SH-
.3 of 5 RC W*YMOND
CD 00 0
Hl SURV/EY Umrr CONTINUES IM' MIkRZONTAL SUR~FACE OF~ OPENING (TYF)
H U II H
II 00r NOTES:
- 1. AT TIUE OF FS -MAP VEL*, P*4EN. U04T CONDUIT ELECTRICAL 8OXES AND PIPuM RO4AHED I PLJAC~E SCAN MEASUREMENT LOCATIONS MAY NEED TO BE ADJUSTED. IN THEE.
FIELD TO ACCOMOBATE INSI'U EQUIPMENT.
ROOM 207 WALL ELEVATIONS BETA SCAN MEASUREMENT LOCATIONS F8131361 -M1 0
1 2
3
=CALE HETERS
0 0
I VIEW LOOKING SOUTH AT COL LINE 10.6 VIEW LKG WEST NEAR CDL LINE H xr
[]{El UIII A4 00 w--
NOTES:
- 1. AT W1&E OF MS MAP flevELPM ENT b10415 CONDUIT, ELECTMCAL OXES AND PIPIN,
RAMIED 0N PLACE-SCAN MEASUREW4ENT LOCATIONS MAY NEED TO BE ADJUSTE)
IN THE FILD TO ALCOMOOATE INSI*U EQUIPMENT.
ROOM 207 WALL ELEVATIONS BETA SCAN MEASUREMENT LOCATIONS F8131361-Ml
<-SHEET4 of 5 0
I 2
3 SCALE METERS
0 0
0 00 O0' w*
Fl*
U H
!I VIEW LOOKING SOUTH AK COL UNE 10A, 0
1 2
3 SCALE ETERS
. EL 29':-O W0,141NUS SURFACE NOTES:
I. AT liME OF FSS MAP OEVELOPMENT UCHTS.
CONDUIT, ELEUTVOCAL BOXES ANO PIPNG REMAINED IN PL*CE. SCAN MEAStREMENT LOCATIONS MAY NEED TO BE ADJUSTED IN THE FIELD TO ADCO).0ATE INS'lU EQLWUET.
ROOM 207 WALL ELEVATIONS BETA SCAN MEASUREMENT LOCATIONS F8131361-M1
.Attachment 2 Instrumentation March 24, 2008 Survey Unit F8131361
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; 149794 43-68/5B; 149103 433 1033 5.9 dpm a,N/
Tennelec; 0401171 N/A N.9 dpm
/A 11.7 dpm_1 Table 2-2. Investigation Criteria and DCGL Value Parameter (dpm/100 cm 2)
Investigation Criteria - Direct 21500 Investigation Criteria - Scan 43000 DCGLw 43000 DCGLEMC N/A Page 2 of 2 Att. 2 Instrumentation F8131361 Investigation March 24, 2008 Survey Unit F8131361 (none required)
Data Assessment March 24, 2008 Survey Unit F8131361
crc 0
00 w'
Uj Fý F8131361 Gross Activity Sample Results Quantile Plot DCGL = 43000 dpm/1 00cm2 I:
4-2,000 -
1,800 -
1,600 -
1,400 -
1,200 -
1,000 -
800-600 -
400 -
200 -
0-1434 0
20 40 60 Percentile 80 100 I
- Direct Measurements (dpm/100cm2)
-median
- -75th Percentile - - - - 50th Percentile I
0 F8131361 Gross Activity Sample Results Scatter Plot DCGL = 43000 dpmllOOcm2 cjI (0
Or1 2000 1800 E 1600 1400 l
1200 EC 1000 000.
S400 200 0
0
, a..
"I i0 0
0
-a-a-a--a-e-ee-e-ee-e-eeee-e-ee-e-eeee-eeee-eeeee 1873 1454 1 1036 0
0 0
00 0
0 000 0
o ao a
a a
a g
a a
ao MU U
U U
U U
U U
U n
U U"
U Measurement Locations I o Gross Activity -
Average -
"+3StDev" -
"-3StDev "I
0 tzý CD F81 31361 Gross Activity Frequency Plot DCGL = 43000 dprn/1 00cm2 4 -
U-C 0j3 3
2.
1 -
0 N-CO 8
qJ CO Nt--
00 Bins - Upper End Value (dpm-/1 00cm2)