ML17065A055

Rancho Seco Nuclear Generating Station - Final Status Survey Summary Report, December 27, 2016, Iosb Cell Deck, Survey Unit F8300093

ML17065A055
Person / Time
Site:	Rancho Seco
Issue date:	01/30/2017
From:	Sacramento Municipal Utility District (SMUD)
To:	Office of Nuclear Material Safety and Safeguards
Shared Package
ML17065A032	List: ML17065A034 ML17065A035 ML17065A036 ML17065A037 ML17065A038 ML17065A040 ML17065A041 ML17065A046 ML17065A047 ML17065A048 ML17065A049 ML17065A051 ML17065A052 ML17065A053 ML17065A054 ML17065A055 ML17065A056 ML17065A057 ML17065A058 ML17065A059 ML17065A060 ML17065A061 ML17065A063 ML17065A064 ML17065A065 ML17065A066 ML17065A068 ML17065A069 ML17065A070 ML17065A071 ML17065A072
References
DPG 17-038
Download: ML17065A055 (16)

Text

Rancho Seco Final Status Survey Sum*mary Report December 27, 2016 IOSB Cell Deck Survey Unit F8300093 FSS Engineer Lead FSS Engineer Approved By:

Manage:RanhOS:COASsets

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FINAL STATUS SURVEY F8300093 Survey Unit: F8300093, Interim Onsite Storage Building (IOSB) Cell Deck Survey Unit

Description:

Operating History:

Designed primarily to store packaged radioactive waste containers safely, protected from the elements, and maintain radiological dose as low as reasonably achievable (ALARA),

each storage cell possibly stored media of many types, including

filters, resins, contaminated chemicals, DAW, activated reactor components, contaminated plant components and other contaminated items. Site Characterization:

Static measurements were made of the walls and ceiling surfaces of the cell deck, to confirm the absence or presence of plant-derived radionuclides.

Static measurements showed an average mean gross activity level of 2,079 dpm/l 00 cm2 and a maximum value of 2,607 dpm/l 00 cm2 for the walls and ceiling.

Based on the levels of gross activity

reported, the area was 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. Static measurement locations were randomly determined and 1 % scan coverage.

The instrumentation used for the survey along with the MDC values are listed in Table 2-1Attachment2.

FSS Cell Deck F8300093

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FINAL STATUS SURVEY F8300093 Table 1, Survey Unit Design Parameters

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,f830 Cell Deck Survey Unit: 009 Class 3 SU Area (m2) 460 Evaluator:

JR DCGLw: 43,000 Gross Activity DCGL Area Factor N/A Class 3 Desiqn DCGLemc (dpm/100cm 2): N/A Class 3 DCGLemc:

N/A Class 3 LBGR: 21,500 Default = 50% DCGL Siqma: 275 Scopinq Survey Data Type I error: 0.05 Tvoe II error: 0.05 Predominant Nuclide Cs-137 Sample Area (m2) N/A Total Instrument Efficiency:

0.132 Total Area Scanned (m2): 5.55 Scan Coveraqe

(%) ,*/. 1}>Jcl'"

Class 3 Choosing

'N/A' sets material Material Tvoe: NIA backqround to "O" . ... :.;

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-.* Z1-a: *1.645 Z1-ll: 1.645 Siqn p: 0.99865.

Calculated Relative Shift: 1a:1 Relative Shift Used: 3.0 Uses 3.0 if Relative Shift >3 N-Value:

11 N-Value+20%:

14 2 FSS Cell Deck f 8300093 =-*-----=--*-__

FINAL STATUS SURVEY F8300093 Survey Results:

A total of 15 direct measurements were made in F8300093.

The results of the static measurements are shown in Table 2. All of the static measurements were less than the DCGL. None of the scan measurements indicated areas of elevated activity.

Swipe data did not indicate elevated activity levels above the MDA. Table 2, Static Measurement Results '

• Number

.. 'Beta (cpm)*

(dprn)* : t,' 1 F8300093X00001 238 1,803 2 F8300093X00002 310 2,348 3 F8300093X00003 205 1,553 4 F8300093X00004 295 '" 2,235 5 F8300093X00005 270 2,045 6 F8300093X00006 288 2,182 7 F8300093X00007 307 2,326 8 F8300093X00008 284 2,152 9 F8300093X00009 250 1,894 10 F8300093X00010 258 1,955 11 F8300093X00011 269 2,038 12 F8300093X00012 211 1,598 13 F8300093X00013 247 1,871 14 F8300093X00014 254 1,924 15 F8300093X00015 235 1,780 Table 3 contains the statistical summary of the static measurement data for the Cell Deck. Table 3, Beta Summary Statistics Beta Static Cell Deck Mean 1,980 Median 1,955 Standard Deviation 242 Minimum 1,553 Maximum 2,348 Count 15 3 FSS Cell Deck f 8300093 FINAL STATUS SURVEY F8300093 Survey Unit Data Assessment:

The survey design required 14 static measurements for the Sign Test. A total of 15 static measurements were collected.

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. Table 4, Data Assessment Results comm'ents

. '**,. Number of Samples:

15 Median: 1, 955 Mean: 1,980 Static Data Standard Deviation:

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2,

• Adjusted N Value: * -1.A S+ Value:

• 15

• Critical Value: *

• 10 Sufficient samples collected:

Pass , .. -. Maximum value <DCGLw: .Pass.* Median value <DCGLw: Pass Mean value <DCGLw: Pas.s Maximum value <DCGLemc:

N/A

• Sign test results:

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The survey unit passes all conditions:

Pass 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 L TP, as long as the residual activity within the survey unit 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 survey and the sample results are consistent with that classification.

The variability of the survey results was greater than the characterization data used for survey design. However, based upon the adjustment of the relative shift, the calculated number of samples did not change. No potential areas of elevated activity were detected.

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FINAL STATUS SURVEY F8300093

==

Conclusion:==

The FSS of this survey unit was properly designed as a Class 3 survey based on the results of the scoping survey. The required number of direct measurements was made and the scan coverage met the requirement of Table 5-6 of the LTP. All of the static measurements were less than the DCGL. No investigations were required.

The static 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 F8300093 meets the release criteria of 1OCFR20.l402.

5 FSS Cell Deck f 8300093

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Attachment 1 Maps December 28, 2016 Survey Unit F8300093.

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F8300093 00010@ 13 = 1 ,955 pm/100 cm2 ..... r1:-"'"'""

'SMUD W.3 TIDEWATER INC CELL DECK SMUD Approvod by. Approval dote: Fage 1 . \1l 'F8300093X00004.

. . . 13 =

dpm/100 cm2 .. F !()()r FB300093X00003

@ 13 = 1 ,553 dpm/100 cm:i

• F8300093X00012

$ 13 = 1 ,598 .dpm/100 cm *

• F8300093XQ0007 13 = 2,326 dpin/100

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F8300093X00008

13. = 2, 152 dpm/100 cm2 r ...... .CD

... ..' ... \. @ F8300093XOO 06 13 = 2;182 dp 100 cm2 F8300 93X00001

@ @ 13 = 1, 03 dpm/100 cm2 F8300093XOO 09 f3 = 1 ,924 dpm 100 cm2 @ FS300093XO 09 f3 = 1 ,894 dp /100 cm2 @ F 8300093X00005 F8300093X00011

$ f3 = 2,038 dpin/100 cm2

@ 8300093X()0013 j3 = 2,348 dpm/100 cri'lz = 1 ,871 dpm/100 cm2 13 = 2,045 dpm/100 cm2 F8300093X00015 =

dpm/100 cm2 Att. 1 Maps F8300093 N

Attachment 2 Instrumentation December 27, 2016 Survey Unit F8300093 Beta Static Measurement Swipe Measurements Table 2-1. Survey Unit Instrumentation Ludlum Model 2350-1 Ludlum Model 44-116 B Detector Ludlum Model 2929 Ludlum Model 44-10-1 Beta -543 dpm/I 00 cm2 Beta -79 dpm/ 100 cm2 132% 43.4% 317897/33 I 972 2110117 I 82597 /188736 5/13/17

• Minimum detectable activities for the count rate instrumentation were calculated in accordance with NUREG-1507, "Minimum Detectable Concentrations with Typical Radiation Survey Instruments for Various Contaminants and Field Conditions" (U.S. NRC, 1997). b Detectors are required to be calibrated once every 12 months. Calibration due date indicates the date by which the detector must be calibrated again. cm2 = square centimeters cpm =counts per minute dpm =disintegrations per minute Page 1 Att. 2 Instrumentation F8300093 Static Measurement MDA Variables Beta Survey Type PR331972 Detector Number 218 Background count rate (cpm) 1 Count Time (min) 0.132 Efficiency 100 Area of Detector

( cm2) Constants 60 sec/min 2.54 cm/in Assumptions Background count time and sample count time are equivalent Calculate Static MDA Static MDA =3 + 4.65(Br

• t)0*5/t

• E

• A/100 (NUREG 1507) Where: Static MDA Page 2 Br t E. A Background Countrate Count Time (min) Efficiency Area of detector

( cm2) 543 dpm/100 cm2 Att. 2 Instrumentation F8300093 Att. 3 Investigation Attachment 3 Investigation December 27, 2016 Survey Unit F8300093 (none required)

F8300093 Attachment 4 Data Assessment December 27, 2016 Survey Unit F8300093 Histogram for Beta Static Activity (dpm/100cm2)

Cell Deck / Nll'l"befo lVoLes 15 """"" "..........,

2,3'8.48 SD 242.03 s ........

.n1* Katcmt -0.67 {i')Mean 1.900.'Xl BModon 1.9154.55 G:]No11nalOittri:iufun 0Lett8n; OMoitBl'lf 1591 1670 1750 18Xl 1909 1!119 2068 2148 I_ Page 1 Att. 4 Data Assessment F8300093 Q-Q Plot for Beta Static Activity (dpm/100 cm2) Cell Deck 2200 1800 1£0l *1.5 *1.0 -0.5 0.0 n5 Theoretical Quantiles (Standard Nonna!) Page2 Att. 4 Data Assessment

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• O.SS Smear_Oat;i_Calculation_Shee\_

101316 I IOSB Final Status Survey I LCl LC2 LC3 LCll f.(6 LCS f\CPM fldpm Date/Time of Count Sample Comments l F830 009 3 c 00001 SM Cell Deck 42 -18 10/12/16 1048 2 FS30 009 3 c 00002 SM Cd\ Deck 37 -29 10/12/16 1018 3 FB30 009 3 c 00003 SM Cell 46 -9 10/12/16 0958 4 F830 009 3 ( 00004 SM Cell Deck 51 3 10/12/16 1042 5 FS30 009 3 c 00005 SM Cell Deck 43 -4 10/12/16 1008 6 FSJO 009 3 c 00006 SM Cell Deck 49 -2 10/12/16 0950 7 F830 009 3 c 00007 SM Deck 62 28 10/12/16 1039 8 F830 009 3 c 00008 SM Cell Deck 49 -2 10/12/06 1033 9 F830 009 3 c 00009 SM Cell Deck 43 -16 10/12/16 1007 10 Fi:\30 009 3 c 00010 SM Cell Deck 53 7 10/12/16 1045 11 Fi:!30 009 3 c 00011 SM Deck 51 3 10/12/16 1025 12 F830 009 3 c 00012 $(\!I Cell Deck 35 -34 10/12/16 1004 13 F830 009 J c 00013 SM Cell Deck 53 19 10/12/16 1030 ----14 F830 009 3 c 00014 SM Cell Deck 37 -29 10/12/16 101.6. 15 F830 009 3 c 00015 5M Cell Deck 42 -18 10/12/16 0957 Comments Oy b>.:>io\'"*

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ideoliiit.:!d bt4ow. Ludlum 2929 Benchtop Instrument tkr. cflic:iC'n*:v bkf, count 2929 S/N: 182597 rate 1im:;-MOA 0.364 HDIV/0! Ct. 113-10-1S/N:188736 cprn min dpin ilfC.) Tech A Sign/ D<1te .;/ !--;,. -1 "Jt/jfjlJ IZ.-7.-lfo 49.8 l 78.6 Cal Due Date: 5/13/2017 f.) OA34 Tech B Sign/ Date rJ qun dpm PPf ;irc:i Page 3 Att. 4 Data Assessment F8300093