ML073400167
| ML073400167 | |
| Person / Time | |
|---|---|
| Site: | Plum Brook |
| Issue date: | 11/29/2007 |
| From: | US National Aeronautics & Space Admin (NASA) |
| To: | NRC/RGN-III/DNMS/DB |
| References | |
| EP-HPT-105 | |
| Download: ML073400167 (13) | |
Text
Survey Unit Release Record I I Design # I EP-HPT-105 / Revision# I Original I Page 1 of 3 I Suwey Unit #(s) HPT- 105
- 1) Embedded Pipe (EP) Survey Unit HPT-105 meets the definition of embedded pipe for Plum Brook Reactor Facility (PBRF).
- 2) EP HPT-105 is a Class 1, Group 3.1 survey unit as per the PBRF Final Status Survey Plan (FSSP) and Technical Basis Document (TBD)-06-004.
- 3) Surveys in EP HPT-105 were performed using a scintillation detector optimized to measure gamma energies representative of Cs-137. Sample #EP 3-8 h m Survey Request (SR)-13 was referenced for this decision.
- 4) Survey Instructions for this survey unit are incorporated into and performed in accordance with (LAW) the Babcock Services Incorporated (BSQtLVS-002, Work Execution Package (WEP)05-006. Survey instructions described in this Description 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 BSWS-002, WEP 05-006, these determinations are appropriate for the types of radiation involved and the media being surveyed.
Approval Signatures Date:
Technical Reviewer CS-0911
FSS Design # EP HPT-105 Revision # Original Page 2 of 3 Survey Unit: HPT-105 1.0 History/Description 1.1 The subject pipe system is a 4 drain line located in the Hot Pipe Tunnel at the -10 el.
1.2 EP HPT-105 consists of 4 diameter piping that is approximately 25 feet in length.
2.0 Survey Design Information 2.1 EP HPT-105 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 25 survey measurements.
2.3 The total surface area for the 4 ID piping is 24,322 cm2 (2.4 m2) for the entire length of (approximately 25) 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 HPT-105 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 HPT-105 Revision # Original Page 3 of 3 Survey Unit: HPT-105 5.5 Statistical Summary Table 4
Statistical Parameter Pipe Total Number of Survey Measurements 25 Number of Measurements >MDC 25 Number of Measurements Above 50% of DCGL 0 Number of Measurements Above DCGL 0 Mean 0.0071 Median 0.0074 Standard Deviation 0.0024 Maximum 0.0135 Minimum 0.0032 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 HPT-105 to be less than 1 mrem/yr. The dose contribution is estimated to be 0.007 mrem/yr based on the average of the actual gross counts measured.
7.0 Attachments Attachment 1 - BSI EP/BP Survey Report Attachment 2 - Pipe Interior Radiological Survey Form Attachment 3 - DQA Worksheet Attachment 4 -Disc containing RR for EP HPT-105 & Spreadsheet
SECTION 7 ATTACHMENT 1 z, PAGE(S)
EP HPT-105 4" Pipe TBD 06-004 Group 3.1 Measurement #
Cs-137 activity Cs-137 activity Co-60 activity Eu-152 activity Eu-154 activity Nb-94 activity Ag-108m activity gcpm ncpm (total dpm) (dpm/100cm2) (dpm/100cm2) (dpm/100cm2) (dpm/100cm2) (dpm/100cm2) (dpm/100cm2)
Unity 1 34 34 141,667 14,562 893 - 60 - - 0.008 2 26 26 108,333 11,135 683 - 46 - - 0.006 3 23 23 95,833 9,850 604 - 40 - - 0.005 4 23 23 95,833 9,850 604 - 40 - - 0.005 5 40 40 166,667 17,131 1,050 - 70 - - 0.009 6 35 35 145,833 14,990 919 - 61 - - 0.008 7 15 15 62,500 6,424 394 - 26 - - 0.003 8 14 14 58,333 5,996 368 - 25 - - 0.003 9 18 18 75,000 7,709 473 - 32 - - 0.004 10 27 27 112,500 11,564 709 - 47 - - 0.006 11 24 24 100,000 10,279 630 - 42 - - 0.005 12 33 33 137,500 14,133 866 - 58 - - 0.007 13 28 28 116,667 11,992 735 - 49 - - 0.006 14 28 28 116,667 11,992 735 - 49 - - 0.006 15 37 37 154,167 15,846 971 - 65 - - 0.008 16 40 40 166,667 17,131 1,050 - 70 - - 0.009 17 37 37 154,167 15,846 971 - 65 - - 0.008 18 34 34 141,667 14,562 893 - 60 - - 0.008 19 30 30 125,000 12,848 788 - 53 - - 0.007 20 34 34 141,667 14,562 893 - 60 - - 0.008 21 20 20 83,333 8,566 525 - 35 - - 0.005 22 60 60 250,000 25,697 1,575 - 105 - - 0.014 23 47 47 195,833 20,129 1,234 - 82 - - 0.011 24 43 43 179,167 18,416 1,129 - 75 - - 0.010 25 39 39 162,500 16,703 1,024 - 68 - - 0.009 MEAN 0.007 MEDIAN 0.007 STD DEV 0.002 MAX 0.014 MIN 0.003 1 of 1
SECTION 7 ATTACHMXNT 2 3 PAGE(S)
a BSVLVSPipeCrawler-002 Revision 5 Pipe Interior Radiological Survey Form Date: 11 15.07 Time: 1013-pipe ID#: /f$'f - 10s Pipe Diameter: Y" Access Point Area:
Building: #T Elevation: - System:
Type of Survey Investigation Characterization Final Survey Other J Gross cs J Detector ID# I Sled ID# 44/67 Detector Cal Date: /6 Detector Cal Due Date: /b O N 08 Instrument: - Instrument ID #. 203438 Instrument Cal Date: Id. llCf 07 Instrument Cal Due Date: /b r>&r 08 From the Daily Pipe Survey Detector Control Form for the Selected Detector Background Value 6. 1 cpm
- 11. ~a.
MDC~,~,
- MDCShti, cpm Efficiency Factor for Pipe Diameter 0 goo Z dpml I fYD 4 cm2
@om detector efficiency determination]
Is the MDC.,.,, acceptable? NO (ifno, adjust sample count time and recalculate M D C L & )
Comments:
Technician Signature
\
Pipe Interior Radiological Suwey 'd Package Page 1 o - 13 REFERENCE COPY Attachment 3, Page 1
- BSLZVSPipeCrawler-002 Revision 5 Pipe Interior Radiological Survey Form (Continuation Form)
Date: II-15.07
. 4 Pipe ID#: Q1
/
- ( 05 Pipe Diameter: Access Point Area:
Building: WT Elevation: .- System:
2 3 Package Page -of REFERENCE COPY Attachment 3, Page 2
SECTION 7 ATTACHMENT 3 I PAGE(S)
Page 1 of 1 SECTION 7 ATTACHMENT 4 1 DISC