ML073400123
| ML073400123 | |
| Person / Time | |
|---|---|
| Site: | Plum Brook File:National Aeronautics and Space Administration icon.png |
| Issue date: | 11/29/2007 |
| From: | US National Aeronautics & Space Admin (NASA) |
| To: | NRC/RGN-III/DNMS/DB |
| References | |
| EP-RX-129 | |
| Download: ML073400123 (12) | |
Text
Survey Unit #(s)
Survey Unit Release Record Description Design #
Rx 129
- 1) Embedded Pipe (EP) Survey Unit Rx 129 meets the definition of embedded pipe for Plum Brook Reactor Facility (PBRF).
- 2) EP Rx 129 is a Class 1, Group 1 survey unit as per the PBRF Final Status Survey Plan (FSSP) and Technical Basis Document (TBD)-06-004.
EP-Rx 129 1 3) Survevs in EP Rx 129 were aerformed using a scintillation detector obtimizeh to measure gamma energies representative of Co-60. Sample #EP 3-8 fkom Survey Request (SR)-13 was referenced for this decision.
Revision #
- 4) Survey Instructions for this survey unit are incorporated into and performed in accordance with (IAW) the Babcock Services Incorporated @SI)ILVS-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.
Original Page 1 of 3
FSS Design # EP Rx 129 Revision # Original Page 2 of 3 Survey Unit: Rx 129 1.0 History/Description 1.1 The subject pipe system is a 4 drain line located in the Room 22 trench on the -27 el. of the Rx building.
1.2 EP Rx 129 consists of 4 diameter piping that is approximately 3 feet in length.
2.0 Survey Design Information 2.1 EP Rx 129 was surveyed IAW Procedure #BSI/LVS-002.
2.2 100% of the 4 ID pipe was accessible for survey. The accessible 4 ID pipe was surveyed by static measurement at one foot increments, for a total of 3 survey measurements.
2.3 The total surface area for the 4 ID piping is 2,919 cm2 (0.3 m2) for the entire length of (approximately 3) of 4 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 129 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 129 Revision # Original Page 3 of 3 Survey Unit: Rx 129 5.5 Statistical Summary Table Statistical Parameter 4
Pipe Total Number of Survey Measurements 3
Number of Measurements >MDC 3
Number of Measurements Above 50% of DCGL 0
Number of Measurements Above DCGL 0
Mean 0.0790 Median 0.0711 Standard Deviation 0.0240 Maximum 0.1059 Minimum 0.0599 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 129 to be less than 1 mrem/yr. The dose contribution is estimated to be 0.079 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 129 & Spreadsheet
SECTION 7 ATTACHMENT 1 z
PAGE(S)
BSI EPlBP SURVEY REPORT DetectorSled #
44-159 2476971101 RP Engineer 1 Date
EP Rx 129 4" Pipe TBD 06-004 Group 1 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
51 51 115,909 11,914 472 11,302 3,004 348 83 0.071 2
43 43 97,727 10,045 398 9,529 2,533 293 70 0.060 3
76 76 172,727 17,754 704 16,842 4,477 518 124 0.106 MEAN 0.079 MEDIAN 0.071 STD DEV 0.024 MAX 0.106 MIN 0.060 1 of 1
SECTION 7 ATTACHMENT 2 2
PAGE(S)
BSI/LVSPipeCrawler-002 Revision 5 Pipe Interior Radiological Survey Form Date:
1)- 8-07 Time:
\\3 5L Pipe D#: $- 1x9 Pipe Diameter:
Access Point Area: fbT~rn ictr\\,,A Building:
Elevation:
-23' System:
Q c ~ \\
C\\
Type of Survey Investigation Characterization Final survey 0 t h e r d Gross C06O d Cs Detector ID# I Sled ID#
W -154 ) 247h47 i \\ b \\
Detector Cal Date:
\\ B -\\ - 0 7 Detector Cal Due Date:
l o - \\ \\ -\\a Instrument:
3.33D- \\
Instrument ID #:
A o ~ Y ~
Y Instrument Cal Date:
\\ O - \\ b - 0 7 Instrument Cal Due Date:
\\I
- \\ b - o f From the Daily Pipe Survey Detector Control Form for the Selected Detector Backgound Value 1.7 cpm MDCRtatic 7. S cpm Efficiency Factor for Pipe Diameter 0.
000Qf (from detector efficiency determination)
MDCsmc 2313 dpml
\\ Om cm2 Is the MDCStlh, acceptable?
NO (if no, adjust sample count t~me and recalculate MDCR,,d Comments:
Po.+
\\ db 40 lom t
tb\\(-tn
+CUM 4r-~fi3h 40 Technician Signature &a Pipe Interior Radiological Suwey 3
Package Page 1 of -
Position 1
2 3 -, Page 1 Feet into Pipe from Operung 1 a 3
Count Time (min)
I 1.
-v Gross Counts 3 i
.LC.3
'7b Gross CPm 3'1 d 3 7
Net cpm R l &
I L dPm/l00cm2 fllc?-
I.I!
SECTION 7 ATTACHMENT 3 I
PAGE(S)
Page 1 of 1
SECTION 7 ATTACHMENT 4 1 DISC