ML073170371

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Survey Unit Release Record EP Rx 135
ML073170371
Person / Time
Site: Plum Brook
Issue date: 11/06/2007
From:
US National Aeronautics & Space Admin (NASA)
To:
NRC/RGN-III/DNMS/DB
References
EP Rx 135
Download: ML073170371 (13)
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Text

Survey Unit Release Record Design # EP-Rx 135 Revision # Original Page 1 of 3 Survey Unit #(s) Rx 135

1) Embedded Pipe (EP) Survey Unit Rx 135 meets the definition of embedded pipe for Plum Brook Reactor Facility (PBRF).
2) EP Rx 135 is a Class 1, Group 2 survey unit as per the PBRF Final Status Survey Plan (FSSP) and Technical Basis Document (TBD)-06-004.
3) Surveys in EP Rx 135 were performed using a scintillation detector optimized to measure gamma energies representative of Co-60. Sample #EP2-5 from Survey Request (SR)-13 was referenced for this decision.
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 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 BSILVS-002, WEP 05-006, these determinations are appropriate for the types of radiation involved and the media being surveyed.

FSSICharacterization Engineer FSSICharacterization Manager Y "

CS-0911

FSS Design # EP Rx 135 Revision # Original Page 2 of 3 1 Survey Unit: Rx 135 I 1.0 History/Description 1.1 The subject pipe system is the 2" cavity drain line on the -6' elevation.

1.2 EP Rx 135 consists of 2" diameter piping that is approximately 36 feet in length.

2.0 Survey Design Information 2.1 EP Rx 135 was surveyed IAW Procedure #BSI/LVS-002.

2.2 100% of the 2" ID pipe was accessible for survey. The accessible 2" ID pipe was surveyed by static measurement at one foot increments, for a total of 36 survey measurements.

2.3 Surface area for the 2" ID piping is 486 cm2for each foot of piping, corresponding to a total 2" ID piping surface area of 17,512 cm2(1.8 m2) for the entire length of (approximately 36') of 2" piping..

3.0 Sunrey Unit Measurement LocationsIData 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 EPtBuried 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 Ru 135 passes FSS.

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

FSS Design # EP Rx 135 Revision # Original Page 3 of 3 Survey Unit' Rx 135 5.5 Statistical Summary Table 6.0 Documentation of evaluations pertaining to compliance with the unrestricted use limit of 25 mremlyr and dose contributions from Embedded Pipe and radionuclides contributing 100/o in aggregate of the total dose for both structural scenarios and soils.

61 A review of the survey results has shown that the dose contribution for EP Rx 135 to be less than 1 mremlyr. The dose contribution is estimated to be 0.163 mealy based on the average of the actual gross counts measured.

7.0 Attachments Attachment 1 - BSI EPBP Survey Report Attachment 2 -Pipe Interior Radiological Swvey Form Attachment 3 -DQA Worksheet Attachment 4 -Disc containingRR for EP Rx 135 & Spreadsheet

SECTION 7 ATTACHMENT 1 3 PAGE(S)

BSI EPlBP SURVEY REPORT Detector-Sled# 44-52 212701/121 Detector Emcienc COMMENTS:

ACTIVITY VALUES NOT BACKGROUND CORRECTED RP Engineer 1 Date I Bd /0-23-0?

EP Rx 135 2" Pipe TBD 06-004 Group 2

EP Rx 135 2" Pipe TBD 06-004 Group 2

SECTION 7 ATTACHMENT 2 z PAGE(S)

BSI/LVSPipeCrawler-002 Revision 4 Pipe Interior Radiological Survey Form Date:

Pipe ID#:

Building m&pee x Time:

Diameter:

Elevation-c3tsro

-b

,I Access Point Area: C A Q ~vTc~u =-

System: b a a L~ u~e 3 S & ~ ~ ~ a Y?+#-~&ZJ

/r.v Type of Survey Investigation -Characterization Final Survey Other J Gross C06O / Cs DetectorID#/SledDD# Y Y - 6 2 / - t 2 / 2 7 d /J &%2+ /&

Detector Cal Date: / /-/ 7- OJ - Detector CaI Due Date: / /-, 7- o 6 Instrument: 23 i7)-1 Instrument ID #: .L/b223 Instrument Cal Date: // -/ 7 d ~ - - Instrument Cal Due Date: I / - / 7-J b From the Daily Pipe Survey Detector Control Form for the Selected Detector Background Value 67 cpm MDCRSbt,, P f cpm Efficiency Factor for Pipe Diameter 0 .0 00 ( h m detector efficiency determination)

MDCstattC bb3b d~m/ ~ Q Q cm2 Is the MDCNQcacceptable? @ NO ( ~no, f adjust sample count time and recalculate MDCG,,)

comments: 1 N \ i-~nC,SwtL\]ty I

,@or&-- 40 Adm;kd-Technician Signature =-prC--

/

Pipe Interior Radiological Survey Package Page I of-' Attachment 3, Page 1

- BSLnVSPipeCrawler-002 Revision 4 Pipe Interior Radiological Suwey Form (Continuation Form)

Date: 2 - LY-0 6 <,

Pipe ID#: ~ ~ 1 3 3 Pipe - Diameter: Access Point Area: C a v , z q ~ G J L - L Building: Rr Elevation. - System: Daard L 1 r i t - S 3W#'& 3tY ti5-D Package Page & of 2- -

REFERENCE COPY Attachment 3, Page 2

SECTION 7 ATTACHMENT 3 PAGE(S)

DQA Check Sheet Design # Rx 135 Revision # Original Survey Unit # Rx 135 Preliminary Data Review' Answers to the following questions should be fully documented in the Survey Unit Release Record Yes No N/A

1. Have surveys been performed in accordance with survey instructions in the Survey Design? X
2. Is the instrumentation MDC for structure static measurements below the D C G h for Class 1 and 2 survey units, or below 0.5 DCGLw for Class 3 survey units? X
3. Is the instrumentationMDC for embeddedlburied piping static measurements below the D C G h ? X
4. Was the instrumentation MDC for structure scan measurements, soil scan measurements, and embeddedlburied piping scan measurements below the DCGLw, or, if not, was the need for additional X static measurements or soil samples addressed in the survey design?
5. Was the instrumentation MDC for volumetric measurements and smear analysis c 10% DCGLw ? X
6. Were the MDCs and assumptions used to develop them appropriate for the instruments and techniques used to perform the survey?
7. Were the survey methods used to collect data proper for the types of radiation involved and for the X

media being surveyed?

8. Were "Special Methods" for data collection properly applied for the survey unit under review? X
9. Is the data set comprised of qualified measurement results collected in accordance with the survey X

design, which accurately reflects the radiological status of the f a c i l i i Graphical Data Review

1. Has a posting plot been created? X
2. Has a histogram (or other frequency plot) been created? X
3. Have other graphical data tools been created to assist in analyzing the data? X Data Analysis
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 c DCGLw? X
3. If elevated areas have been identified by scans and/or sampling, is the average activity in each X

elevated area < DCGLEhnc(Class I), c DCGLw (Class 2), or <0.5 DCGLw (Class 3)?

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 Wr for WRS Test) 2 the critical value? X Comments:

Page 1 of 1

SECTION 7 ATTACHMENT 4 1 DISC

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