ML080590183

Plum Brook Reactor Facility (Pbrf Survey Unit Release Record EP ROLB-105

ML080590183
Person / Time
Site:	Plum Brook
Issue date:	02/21/2008
From:	Case R, Wood G - No Known Affiliation
To:	NRC/RGN-III
References
EP ROLB-105
Download: ML080590183 (31)

Text

Survey Unit Release Record Design # EP ROLB-105 Revision # Original Page 1 of 4 Survey Unit #(s) ROLB- 105

1) Embedded Pipe (EP) Survey Unit ROLB-105 meets the definition of embedded pipe for Plum Brook Reactor Facility (PBRF).

2) EP ROLB-105 is a Class 1, Group 1 survey unit as per the PBRF Final Status Survey Plan (FSSP) and Technical Basis Document (TBD)-06-004.

This survey unit was not a system pipe. The piping of this survey unit was utilized as a source well. Group 1 is the most conservative piping group for dose assessment referenced in TBD-06-004.

3) Embedded Pipe surveys in EP ROLB-105 were performed using a scintillation detector optimized to measure beta energies 285 keV (IS0 7503- 1 Table3, Tc99). This energy is lower than the beta energy for C060 (96 keV, IS0 7503-1 Table 3), assuring the nuclide of concern for DCGL is assessed during data acquisition.

Description

4) Survey Instructions for this survey unit are incorporated into and performed in accordance with (IAW) the Babcock Services Incorporated (BSI)/LVS-003, Work Execution Package (WEP)05-006. Survey instructions described in this document constitute "Special Methods" and the survey design used in the acquisition of survey meashements.

5) Instrument efficiency determinations are developed in accordance with the BSIILVS-003, WEP 05-006, these determinations are appropriate for the types of radiation involved and the media being surveyed.

FSSICharacterization Engineer CS-0911

FSS Design # EP ROLB-105 Revision # Original Page 2 of 4 Survey Unit: ROLB-105 1.0 History/Description 1.1 The subject pipe is the source well in the ROLB -15 level.

1.2 EP ROLB-105 consists of 18.75 diameter piping that is approximately 44 feet in length.

2.0 Survey Design Information 2.1 EP ROLB-105 was surveyed IAW Procedure #BSI/LVS-003.

2.2 41 feet of the 18.75 pipe was accessible for direct survey by pipecrawler technology. The inaccessible piping includes a ~1.9 ft2 (~0.17m2 ) section of an end cap at one end of the well and the three feet of piping between the -18 elevation and the -15 elevation in the ROLB. The end cap and upper 3 feet of the source well are inaccessible to the pipecrawler.

2.3 100% of the accessible piping was scanned.

2.4 Eight survey locations were selected by a random number generator for static measurements. At each accessible location four static measurements were acquired IAW BSI/LVS-003 for a total of 32 static measurements (Att. 1A).

2.5 The pipes upper 7 was surveyed and bounded under SR-99. Further direct surveys into the pipe well by personnel was not warranted based on piping history, pipecrawler survey results, difficulty for personnel access, and confined space concerns.

2.6 The surface area for the 18.75 piping is 4560 cm2 for each foot of piping, corresponding to a piping surface area of 202340 cm2 (20.23 m2) for the 44 feet of embedded pipe 18.75 piping and end cap.

3.0 Survey Unit Measurement Locations/Data 3.1 Pipe interior radiological survey forms are provided in Attachment 2 of this release record.

4.0 Survey Unit Investigations/Results 4.1 None 5.0 Data Assessment Results 5.1 Data assessment results are provided in the EP/Buried Pipe (BP) Survey Report provided in Attachment 1A & 1B.

5.2 This survey unit was assessed for compliance with the release criterion attributing all activity derived dose as a 100% Co60 nuclide distribution.

This is the most conservative DCGL for the facility.

5.3 All scan measurement results are less than the Derived Concentration Guideline Level (DCGL) for radionuclide specific EP that corresponds to the 1 mrem/yr dose goal established in Table 3-3 of the FSSP.

FSS Design # EP ROLB-105 Revision # Original Page 3 of 4 Survey Unit: ROLB-105 5.4 Scan measurements are acquired at 0.7 inches/sec for each section of accessible 18.75piping. The documented gross cpm measurement for each scan is the highest, instantaneous, cpm count rate observed during the scan. The derived activity from these scan measurements is the most conservative quantity for that section of assessed piping. This conservatism is replicated when determining compliance with the DCGL release criterion. (BSI/LVS 003, WEP 05-000-6).

5.5 All static measurement results are less than the Derived Concentration Guideline Level (DCGL) for radionuclide specific EP that corresponds to the 1 mrem/yr dose goal established in Table 3-3 of the FSSP.

5.6 Direct measurements of the upper bound of the source well were acquired by FSS/Characterization personnel (Att. 2B) .The direct measurements of the upper bound of the source well indicate no total surface activity levels

>145dpm/100cm2 (<0.001 Unity).

5.7 When implementing the Unity Rule, provided in Section 3.6.3 of the FSSP, the survey unit that is constituted by EP ROLB-105 passes FSS.

5.8 Background was not subtracted from the survey measurements and the Elevated Measurement Comparison (EMC) was not employed for this survey unit.

5.9 Based upon the results of the final survey measurements and the direct survey of the upper source well boundary, it is reasonable to conclude that the final survey of the accessible portion of this pipe system is appropriate to demonstrate the radiological condition of the entire pipe. Survey Unit EP ROLB-105 demonstrates compliance with the DCGL values, as presented in Sections 3.3, 7.5 and Attachment C of the PBRF FSSP.

FSS Design # EP ROLB-105 Revision # Original Page 4 of 4 Survey Unit: ROLB-105 5.10 Statistical Summary Table 18.75 Statistical Parameter Pipe Total Number of Static Survey Measurements 32 Number of Measurements >MDC 32 Number of Measurements Above 50% of DCGL 0 Number of Measurements Above DCGL 0 Mean 0.009 Median 0.010 Standard Deviation 0.001 Maximum 0.012 Minimum 0.007 6.0 Documentation of evaluations pertaining to compliance with the unrestricted use limit of 25 mrem/yr and dose contributions from Embedded Pipe and radionuclides contributing 10% in aggregate of the total dose for both structural scenarios and soils.

6.1 A review of the survey results has shown that the dose contribution for EP ROLB-105 to be less than 1 mrem/yr. The dose contribution is estimated to be 0.009 mrem/yr based on the average of the actual gross counts measured.

7.0 Attachments Attachment 1A - BSI EP/BP Survey Report Static & Random Number Generated Static Locations Attachment 1B - BSI EP/BP Survey Report Scan Attachment 2A - Pipe Interior Radiological Survey Form Attachment 2B - FSS/Characterization Survey Form Attachment 3 - DQA Worksheet Attachment 4 - EP ROLB-105 SURR & Spreadsheet Disc

SECTION 7 ATTACHMENT 1A 3 PAGES

@@& BSl EPlBP SURVEY REPORT (STATIC)

Pipe ID ROLB 105 Survey Location -15 ROLB Survey Date 03-Apr-06 2350-1 # 203440 Survey Time 1245 Detector-Sled # 223210-LVS CRLR20 Pipe Size 18.75" Detector Efficiency 0.06 13 Pipe Area Incorporated by Detector DCGL (dpm1100cm2) 240800 Efficiency (in cm2) 100 50% DCGL ( ~ P ~ I I O O C ~ ~ )120400 Field BKG ( C P ~ ) 235.6 Routine Survey X Field MDCR ( C P ~ ) 55.9 QA Survey Nominal MDC (dpm/lOOcm2) 1,017 Survey Measurement Results Total Number of Survey Measurements 32 Number of Measurements >MDC 32 Number of Measurements Above 50% DCGL 0 Number of Measurements Above DCGL 0 Mean 0.009 Median 0.010 Standard Deviation 0.001 Maximum 0.012 Minimum 0.007 ROSENHAGEN Survey Technician(s)

Survey Unit Classification 1 Area FactorIEMC Used No PassIFail FSS Pass MREMNR Contribution <1 COMMENTS:

ACTIVITY VALUES NOT BACKGROUND CORRECTED.

RP Engineer I Date

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EP ROLB 105 18.75" Pipe Co-60 activity Co-60 activity Measurement ID # gcpm net cpm Unity (total dpm) (dpm/100cm2) 1 152 152 2,480 2,480 0.010 2 175 175 2,855 2,855 0.012 3 165 165 2,692 2,692 0.011 4 147 147 2,398 2,398 0.010 5 151 151 2,463 2,463 0.010 6 152 152 2,480 2,480 0.010 7 147 147 2,398 2,398 0.010 8 157 157 2,561 2,561 0.011 9 143 143 2,333 2,333 0.010 10 154 154 2,512 2,512 0.010 11 161 161 2,626 2,626 0.011 12 140 140 2,284 2,284 0.009 13 163 163 2,659 2,659 0.011 14 159 159 2,594 2,594 0.011 15 136 136 2,219 2,219 0.009 16 152 152 2,480 2,480 0.010 17 115 115 1,876 1,876 0.008 18 152 152 2,480 2,480 0.010 19 126 126 2,055 2,055 0.009 20 120 120 1,958 1,958 0.008 21 127 127 2,072 2,072 0.009 22 115 115 1,876 1,876 0.008 23 142 142 2,316 2,316 0.010 24 134 134 2,186 2,186 0.009 25 101 101 1,648 1,648 0.007 26 137 137 2,235 2,235 0.009 27 109 109 1,778 1,778 0.007 28 115 115 1,876 1,876 0.008 29 127 127 2,072 2,072 0.009 30 124 124 2,023 2,023 0.008 31 116 116 1,892 1,892 0.008 32 117 117 1,909 1,909 0.008 MEAN 0.009 MEDIAN 0.010 STD DEV 0.001 MAX 0.012 MIN 0.007 1 OF 1

EXCEL RNG ADD-IN FOR ROLB 105 5

13 16 20 24 31 32 39

SECTION 7 ATTACHMENT 1B 3 PAGES

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h&& BSI EPlBP SURVEY REPORT (SCAN)

Pipe ID ROLB 105 Survey Location -15 ROLB Survey Date 331-06 1 43-06 2350-1 # 203440 SurveyTime 1115/0800 Detector-Sled # 223210-LVS CRLR20 Pipe Size 18.75" Detector Efficiency 0.0499 Pipe Area Incorporatedby Detector DCGL (dpm/IOOcm2) 240800 Efficiency (In cm2) 100 50% DCGL (dpm1100cm2) 120400 Field BKG ( C P ~ ) 290 / 235.6 Survey Technician(s)

ACTIVITY VALUES NOT BACKGROUND CORRECTED.

EP ROLB-105 18.75" Pipe Co-60 activity Co-60 activity Measurement ID # gcpm net cpm Unity (total dpm) (dpm/100cm2) 1 205 205 4,108 4,108 0.017 2 261 261 5,230 5,230 0.022 3 176 176 3,527 3,527 0.015 4 161 161 3,226 3,226 0.013 5 153 153 3,066 3,066 0.013 6 129 129 2,585 2,585 0.011 7 150 150 3,006 3,006 0.012 8 156 156 3,126 3,126 0.013 9 139 139 2,786 2,786 0.012 10 176 176 3,527 3,527 0.015 11 154 154 3,086 3,086 0.013 12 172 172 3,447 3,447 0.014 13 159 159 3,186 3,186 0.013 14 141 141 2,826 2,826 0.012 15 187 187 3,747 3,747 0.016 16 172 172 3,447 3,447 0.014 17 161 161 3,226 3,226 0.013 18 162 162 3,246 3,246 0.013 19 178 178 3,567 3,567 0.015 20 134 134 2,685 2,685 0.011 21 162 162 3,246 3,246 0.013 22 147 147 2,946 2,946 0.012 23 164 164 3,287 3,287 0.014 24 152 152 3,046 3,046 0.013 25 156 156 3,126 3,126 0.013 26 162 162 3,246 3,246 0.013 27 169 169 3,387 3,387 0.014 28 195 195 3,908 3,908 0.016 29 174 174 3,487 3,487 0.014 30 166 166 3,327 3,327 0.014 1 194 194 3,888 3,888 0.016 2 188 188 3,768 3,768 0.016 3 192 192 3,848 3,848 0.016 4 191 191 3,828 3,828 0.016 5 176 176 3,527 3,527 0.015 6 175 175 3,507 3,507 0.015 7 168 168 3,367 3,367 0.014 8 180 180 3,607 3,607 0.015 9 171 171 3,427 3,427 0.014 10 182 182 3,647 3,647 0.015 11 172 172 3,447 3,447 0.014 12 164 164 3,287 3,287 0.014 13 164 164 3,287 3,287 0.014 14 204 204 4,088 4,088 0.017 15 172 172 3,447 3,447 0.014 16 153 153 3,066 3,066 0.013 17 163 163 3,267 3,267 0.014 1 OF 2

EP ROLB-105 18.75" Pipe Co-60 activity Co-60 activity Measurement ID # gcpm net cpm Unity (total dpm) (dpm/100cm2) 18 189 189 3,788 3,788 0.016 19 181 181 3,627 3,627 0.015 20 189 189 3,788 3,788 0.016 21 223 223 4,469 4,469 0.019 22 212 212 4,248 4,248 0.018 23 167 167 3,347 3,347 0.014 24 204 204 4,088 4,088 0.017 25 184 184 3,687 3,687 0.015 26 194 194 3,888 3,888 0.016 27 190 190 3,808 3,808 0.016 28 230 230 4,609 4,609 0.019 29 234 234 4,689 4,689 0.019 30 218 218 4,369 4,369 0.018 31 186 186 3,727 3,727 0.015 32 235 235 4,709 4,709 0.020 33 190 190 3,808 3,808 0.016 34 196 196 3,928 3,928 0.016 35 184 184 3,687 3,687 0.015 36 207 207 4,148 4,148 0.017 37 196 196 3,928 3,928 0.016 38 222 222 4,449 4,449 0.018 39 190 190 3,808 3,808 0.016 40 194 194 3,888 3,888 0.016 41 210 210 4,208 4,208 0.017 42 184 184 3,687 3,687 0.015 43 176 176 3,527 3,527 0.015 44 205 205 4,108 4,108 0.017 45 213 213 4,269 4,269 0.018 46 175 175 3,507 3,507 0.015 47 198 198 3,968 3,968 0.016 48 187 187 3,747 3,747 0.016 49 207 207 4,148 4,148 0.017 50 226 226 4,529 4,529 0.019 51 201 201 4,028 4,028 0.017 52 176 176 3,527 3,527 0.015 53 192 192 3,848 3,848 0.016 MEAN 0.015 MEDIAN 0.015 STD DEV 0.002 MAX 0.022 MIN 0.011 2 OF 2

SECTION 7 ATTACHMENT 2A 11 PAGES

-- - BSVLVSPipeCrawler-003 Original Pipe Interior Radiological Survey Form Date: 3 . 3 /- 0 b Time: /I/ r Pipe ID#: DL&!A-fi- /cpipe Diameter: / a %' Access Point Area: 2 -1 1 5 Building: 70 Lt.3 Elevation: - IS- System: kkb 5'k&& ~ / d s Type of Survey Investigation -Characterization -Final Survey Other r / '

Gross V ' Cs137 Detector ID#/ Sled ID# c:l-t/h,~23$lo/ 7% ,/&

Detector Cal Date: /Ir;.N&/ti'\*0G Detector Cal Due Date: - Q7 hstrument: 235- t ~nstrumentID #: S'Q~YVO Instrument Cal Date: I 5-/rZW - 9 & Instrument Cal Due Date: /bR. A A f -07 From the Daily Pipe Survey Detector Control Form for the Selected Detector Background Value 296' cpm MDC~,,, N7 Jf-f-qprn Efficiency Factor for Pipe Diameter 01 D 'f49 (from detector efficiency determination)

MDCSsbc 35bv Is the MDC,,,,, acceptable?

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System: C& 5-I I I I I I I I Package Page - b of -3 Attachment 3, Page 2

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Type of Survey Investigation Characterization -Final Survey /C Other X Gross J' C06O Cs137 Detector ID#/ Sled tD# ~ q ~ / l b /d23 1 7'~ d#-,/&

Detector Cal Date: 1$.in&& - ob Detector Cal Due Date: /I-. r*rA-A - a 7 Instrument: 23%- Instrument ID #: dd3YY b Instrument Cal Date: /s' f l &L ab - Instrument Cal Due Date: / S. fvlWe-- C -7 From the Daily Pipe Survey Detector Con.trol Form for the Selected Detector Background Value a 3 $- & cpm MDCRs-1, SF(4 ,

Efficiency Factor for Pipe Dlameter

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MDCstatIc 3Zl b Is the MDC,,,, acceptable? a i NO cm2 (if no, adjust sample count tune and recalculate MDC%&

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Pipe Interior Radiological Survey Package Page 1 of REFERENCE COPY Attachment 3, Page 1

-- BSI/LVSPipeCrawler-003 Original Pipe Interior Radiological Suwey Form (Continuation Form)

Date: 4.3-0 d Pipe ID#: p,Schp?F //OT Pipe Diameter: /S 3 ~ " Access Point Area: ,/5- &4 Building: 7 0 ~ 0 Elevation: -1 ,c System: &d-k +&A Package page 2of REFERENCECOPY Attachment 3, Page 2

BSIILVSPipeCrawler-002 Revision 4 Pipe Interior Radiological Survey Form (Continuation Form)

Date: &?,o b '(

Pipe ID#: &,&-S+&+ I b_T Pipe Diameter: / 8 '14 Access Point Area: di16'@ .

Building: 723.d Elevation: System: d 4 L S ?5+d~L Package Page 3 of - J REFERENCE COPY Attachment 3, Page 2

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- BSILVSPipeCrawler-003 Original Pipe Interior Radiological Survey Form Date: .5' 0 ~ 6 Time: /24s Pipe ID#: g&i5#&/0.,' Pipe Diameter: /D Yq " Access Point Area: '/gfi6G Building: C~ZULB Elevation: -I 5 System: &A~ n ( s s ~ 7 Type of Survey Investigation Characterizat~on Final Survey l(i Other )9 Gross J C06O Cs137 Detector ID# 1 Sled ID# f%-//C-/ $9 3 0 I ?C y 4 - / / l u Detector Cal Date: /s /l'?kl' 0 6 Detector Cal Due Date: / S - - @/fwd 07 Instrument: $352- Instrument ID #: #35%

Instrument Cal Date: S -&f& '0 L. Instrument Cal Due Date: ,5- Pi W

' .L)7 From the Daily Pipe Survey Detector Control Form for the Selected Detector Background Value 6735.6 cpm MDCRstatic 3-j, 9 CPm Efficiency Factor for Pipe Diameter 0 . 0& 1 3 (from detector efficiency determination)

MDCstatic 1017 d~ml 100 cm2 Is the hlDCs,ti, acceptable? NO (if no, adjust sample count time and recalculate MDCR,~)

Comments:

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Technician Signature Pipe Interior Radiological Survey Package Page 1 of JSff Attachment 3, Page I

- BSb'LVSPipeCrawler-003 Original Pipe Interior Radiological Survey Form (Continuation Form)

Date: 4 2, (u Pipe ID#:&&.

Building:

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Package Page 2of $f REFERENCE COPY 1 Attachment 3, Page 2

BSIILVSPipeCrawler-003 Original n

REFERENCECOPY

EXCEL RNG ADD-IN FOR ROLB 105 REFERENCE COPY

SECTION 7 ATTACHMENT 2B 3 PAGES

FSSICHARACTERIZATION SURVEY FORM Survey Unit No. NIA ClassificaUon NIA Survey Number CHSS23 Survey Location ROLE Basement - Source Pit Survey Request (SR) # 99 Reason1Type CharaterizationlScans & Statics Date of Survey 2/21/08 Time of suwey 0922 Technician rpdrm.los R. Fowler1 R Technician ,prrm3*l., NIA

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Date of Review 2 - 2 /- 3 8

~ a d i o l o ~ iInstrument 61 Data Fnstrument ~ y p e 1 2350-1 1 Instrument Type 1 NIA ( Instrument Type I NIA I Serial Number / 193707 / Serial Number 1 NIA I Serial Number I NIA 1 GI. ~ u atee I 9110108 I Cal. Due Date I NIA I Cal. Due Date I NIA I probe T Y P ~ 1 44-1 16 I Probe Type I NIA I probe ~ y p e I NIA I Serial Number I 223210 / Serial Number 1 NIA I Serial Number I NIA ICal. Due date 1 9110108 I Cal. Due date I NIA 1 Cal. Due date I NIA I Efficiency I 42.7% I Efficiency I NIA I ERciency I NIA 1 ABCR (CW)

.. . II 265 1I ABCR (CW)

.. . 1I NIA II Background

- (cpm)

. . . 1 NIA MDC Scan MDC Scan MDC Scan 1630 NIA NIA (dpm~00cm~ ( d p m 0Ocm2)

~ (dpm1100cm')

Source Checks Sat IXI Unsat Source Checks Sat Unsat Source Checks Sat Unsat Miscellaneous Suwev Data Survey Summary Technician Field Notes The purpose of this survey was to perform scan and statics of the source pit in the ROLB Basement.

ERlZATlON SURVEY FO BCR # = Background Count Rate

FSSICHARACTERIZATION SURVEY FORM (continuation Sheet)

Page 3 of&

SECTION 7 ATTACHMENT 3 1 PAGE

Page 1 of 1 SECTION 7 ATTACHMENT 4 1 DISC