ML073400160
| ML073400160 | |
| Person / Time | |
|---|---|
| Site: | Plum Brook File:National Aeronautics and Space Administration icon.png (R-093, TR-003) |
| Issue date: | 11/29/2007 |
| From: | US National Aeronautics & Space Admin (NASA) |
| To: | NRC/RGN-III/DNMS/DB |
| References | |
| EP-RX-114 | |
| Download: ML073400160 (15) | |
Text
Survey Unit Release Record Design #
1 EPRx 114 I Revision #
1 Original Page I of 3
- 2) EP Rx 114 is a Class 1, Group 2 survey unit as per the PBRF Final Status Survey Plan (FSSP) and Technical Basis Document (TBD)-06-004.
Survey Unit #(s)
- 3) Surveys in EP Rx 1 14 were performed using a scintillation detector optimized to measure gamma energies representative of Co-60. Sample
- CS050330-003 from Survey Request (SR)-13 was referenced for this decision.
Rx 114
- 1) Embedded Pipe (EP) Survey Unit Rx 114 meets the definition of embedded pipe for Plum Brook Reactor Facility (PBRF).
Description
- 4) Survey Instructions for this survey unit are incorporated into and performed in accordance with (IAW) the Babcock Services Incorporated (BSI)/LVS-002, 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 measurements.
- 5) Instrument efficiency determinations are developed in accordance with the BSIILVS-002, WEP 05-006, these determinations are appropriate for the types of radiation involved and the media being surveyed.
Approval Signatures Date:
FSS Design # EP Rx 114 Revision # Original Page 2 of 3 Survey Unit: Rx 114 1.0 History/Description 1.1 The subject pipe system is an 8 rabbit tube running between Canal H and the Annulus on the -25 el. of the Rx building.
1.2 EP Rx 114 consists of 8 diameter piping that is approximately 50 feet in length.
2.0 Survey Design Information 2.1 EP Rx 114 was surveyed IAW Procedure #BSI/LVS-002.
2.2 100% of the 8 ID pipe was accessible for survey. The accessible 8 ID pipe was surveyed by static measurement at one foot increments, for a total of 50 survey measurements.
2.3 The total surface area for the 8 ID piping is 97,288 cm2 (9.7 m2) for the entire length of (approximately 50) of 8 piping.
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 1.
5.2 All 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.
5.3 When implementing the Unity Rule, provided in Section 3.6.3 of the FSSP, and applying the Nuclide Fraction (NF), provided in TBD-06-004, the survey unit that is constituted by EP Rx 114 passes FSS.
5.4 Background was not subtracted from the survey measurements and the Elevated Measurement Comparison (EMC) was not employed for this survey unit.
FSS Design # EP Rx 114 Revision # Original Page 3 of 3 Survey Unit: Rx 114 5.5 Statistical Summary Table Statistical Parameter 8
Pipe Total Number of Survey Measurements 50 Number of Measurements >MDC 50 Number of Measurements Above 50% of DCGL 0
Number of Measurements Above DCGL 0
Mean 0.0121 Median 0.0121 Standard Deviation 0.0022 Maximum 0.0163 Minimum 0.0080 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 Rx 114 to be less than 1 mrem/yr. The dose contribution is estimated to be 0.012 mrem/yr based on the average of the actual gross counts measured.
7.0 Attachments - BSI EP/BP Survey Report - Pipe Interior Radiological Survey Form - DQA Worksheet -Disc containing RR for EP Rx 114 & Spreadsheet
SECTION 7 ATTACHMENT 1 3
PAGE(S)
BSI EPlBP SURVEY REPORT DetectorSled #
G3 BICRON B566.41108 ACTIVITY VALUES NOT BACKGROUND CORRECTED RP Engineer I Date
EP Rx 114 8" Pipe TBD 06-004 Group 2 Measurement #
gcpm ncpm Co-60 activity (total dpm)
Co-60 activity (dpm/100cm2)
Cs-137 activity (dpm/100cm2)
Eu-152 activity (dpm/100cm2)
Eu-154 activity (dpm/100cm2)
Nb-94 activity (dpm/100cm2)
Ag-108m activity (dpm/100cm2)
Unity 1
169 169 40,238 2,068 1,072 17 12 1
60 0.009 2
174 174 41,429 2,129 1,104 18 12 1
61 0.009 3
189 189 45,000 2,313 1,199 19 14 1
67 0.010 4
222 222 52,857 2,717 1,409 23 16 1
78 0.012 5
241 241 57,381 2,949 1,529 24 17 1
85 0.013 6
253 253 60,238 3,096 1,605 26 18 2
89 0.013 7
256 256 60,952 3,133 1,624 26 18 2
90 0.014 8
221 221 52,619 2,704 1,402 22 16 1
78 0.012 9
229 229 54,524 2,802 1,453 23 16 1
81 0.012 10 226 226 53,810 2,765 1,434 23 16 1
80 0.012 11 250 250 59,524 3,059 1,586 25 18 1
88 0.013 12 264 264 62,857 3,230 1,675 27 19 2
93 0.014 13 233 233 55,476 2,851 1,478 24 17 1
82 0.012 14 246 246 58,571 3,010 1,561 25 18 1
87 0.013 15 212 212 50,476 2,594 1,345 22 15 1
75 0.011 16 210 210 50,000 2,570 1,332 21 15 1
74 0.011 17 238 238 56,667 2,912 1,510 24 17 1
84 0.013 18 245 245 58,333 2,998 1,555 25 18 1
86 0.013 19 272 272 64,762 3,328 1,726 28 19 2
96 0.014 20 276 276 65,714 3,377 1,751 28 20 2
97 0.015 21 240 240 57,143 2,937 1,523 24 17 1
85 0.013 22 300 300 71,429 3,671 1,904 30 21 2
106 0.016 23 271 271 64,524 3,316 1,720 27 19 2
95 0.014 24 287 287 68,333 3,512 1,821 29 21 2
101 0.015 25 284 284 67,619 3,475 1,802 29 20 2
100 0.015 26 272 272 64,762 3,328 1,726 28 19 2
96 0.014 27 301 301 71,667 3,683 1,910 31 22 2
106 0.016 28 307 307 73,095 3,757 1,948 31 22 2
108 0.016 29 276 276 65,714 3,377 1,751 28 20 2
97 0.015 30 275 275 65,476 3,365 1,745 28 20 2
97 0.015 31 295 295 70,238 3,610 1,872 30 21 2
104 0.016 1 of 2
EP Rx 114 8" Pipe TBD 06-004 Group 2 Measurement #
gcpm ncpm Co-60 activity (total dpm)
Co-60 activity (dpm/100cm2)
Cs-137 activity (dpm/100cm2)
Eu-152 activity (dpm/100cm2)
Eu-154 activity (dpm/100cm2)
Nb-94 activity (dpm/100cm2)
Ag-108m activity (dpm/100cm2)
Unity 32 248 248 59,048 3,035 1,574 25 18 1
87 0.013 33 241 241 57,381 2,949 1,529 24 17 1
85 0.013 34 191 191 45,476 2,337 1,212 19 14 1
67 0.010 35 171 171 40,714 2,092 1,085 17 12 1
60 0.009 36 204 204 48,571 2,496 1,294 21 15 1
72 0.011 37 179 179 42,619 2,190 1,136 18 13 1
63 0.009 38 186 186 44,286 2,276 1,180 19 13 1
66 0.010 39 177 177 42,143 2,166 1,123 18 13 1
62 0.009 40 186 186 44,286 2,276 1,180 19 13 1
66 0.010 41 203 203 48,333 2,484 1,288 21 15 1
71 0.011 42 184 184 43,810 2,252 1,168 19 13 1
65 0.010 43 199 199 47,381 2,435 1,263 20 14 1
70 0.011 44 188 188 44,762 2,300 1,193 19 13 1
66 0.010 45 184 184 43,810 2,252 1,168 19 13 1
65 0.010 46 211 211 50,238 2,582 1,339 21 15 1
74 0.011 47 189 189 45,000 2,313 1,199 19 14 1
67 0.010 48 151 151 35,952 1,848 958 15 11 1
53 0.008 49 200 200 47,619 2,447 1,269 20 14 1
70 0.011 50 224 224 53,333 2,741 1,421 23 16 1
79 0.012 MEAN 0.012 MEDIAN 0.012 STD DEV 0.002 MAX 0.016 MIN 0.008 2 of 2
SECTION 7 ATTACHMENT 2 4
PAGE(S)
Pipe Interior Radiological Suwey Form Date:
/./ /. 3L=
Time:
/30° Building:
'Ts+?L~- Elevation
-
- S Access Point crt..'&~
/7/
System: 3h38h n AEJ~ULIUJ Pipe Diameter:
I /
Area:
Pipe ID
??'k I/?
Type of Survey Investigation Characterization Other J
Sled Size f "
inch Detector:
6 3 / & r - & $ x a Detector ID #:
3 ~ 7 ~ ~ f t
- / d z?
Cal Date:
/7./clov -
35-Cal Due Date:
7 D
r O L Instrument:
$ 3 1 2 " /
Instrument ID #:
3 0 3 f 6 Y Cal Date:
/ 7 -/J@d - 0 5 Cal Due Date:
7 f i
l
- o &
From the Daily Pipe Survey Detector Control Form for the Selected Detector Background Value CPm MDCRwiC 3 2
- 7 cpm Efficiency Factor for Pipe O.0042- (taken from detector calibration certificate)
F&ef$:
1177 dpm/100cm2 IS the MDCShtic No (if no, adjust sample count time and recalculate MDCR,IItiri) cdffi~fig&kle?
/.
Ld'7-d~ \\Tq~df'/
E Pipe Interior Radiological Survey Radiological Survey Commenced: Date:
/-/ 1.
Time:
1 3 O 6 Position Feet into Pipe Count Time Gross Net Gross from Opening dpm/100cm2 cpm REFERENCE COPY 0 Package Page 1 o f 3, Page 1
Pipe Interior Radiological Suwey Form (Continuation Form)
/ - / I
- ace RX I/(/
REFERENCE COPY Package page 2 of 3, Page 2
Pipe Interior Radiological Survey Form (Continuation Form)
REFERENCE COPY Package Page 2 of 3, Page 2
SECTION 7 ATTACHMENT 3
/
PAGE(S)
Desian #
I Rx 114 I Revision #
/
Oriainal I
1 Survey Unit # 1 Rx 114 1
Have surveys been performed In accordance wlth survey lnstructlons in the Survey Deslgn?
2 Is the instrumentat~on MDC for struclure statlc measurements below the DCGLw for Class 1 and 2 survey units, or below 0.5 DCGLwfor Class 3 survey units?
A
- 3.
Is the instrumentation MDC forembeddedlburied piping static measurements below the DCGLw ?
1 x 1 4
Was the ~nstrumentatlon MDC for structure scan measurements, soil scan measurements, and embeddedlburled piplng scan measurements below the DCGLw,or, d not, was the need for addltlonal X
stabc measurements or so11 samples addressed ln the survey design?
- 5.
Was the instrumentation MDC for volumetric measurements and smear analvsis c 10% DCGLW 7 X
6 Were the MDCs and assumptions used to develop them appropnate for the Instruments and techn~ques used to ~erform the survev?
- 1.
Has a posting plot been created?
I I
1 X
- 2.
Has a histogram (or other frequency plot) been created?
X
- 3.
Have other araohical data tools been created to assist in analvzino the data?
1 I
1 X
1 Are all sample measurements below the DCGLw (Class 1 & 2), or 0.5 DCGLw (Class 3)?
X
- 2.
Is the mean of the sample data < DCGLw?
X
- 3.
If elevated areas have been identified by scans andlor sampling, is the average activity in each elevated area c DCGL-(Class I),
c DCGLw (Class 2), or ~ 0. 5 DCGLW (Class 3)?
X
- 4.
Is the result of the Elevated Measurements Test < 1.0?
X
- 5.
Is the result of the statistical test (S+ for Sign Test or W, for WRS Test)? the critical value?
1 I
I X
Comments:
Page 1 of 1
SECTION 7 ATTACHMENT 4 1 DISC