ML073400167

EP-HPT-105, Nasa, Survey Unit Release Record

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