ML073170393
| ML073170393 | |
| Person / Time | |
|---|---|
| Site: | Plum Brook |
| Issue date: | 11/07/2007 |
| From: | US National Aeronautics & Space Admin (NASA) |
| To: | NRC/RGN-III/DNMS/DB |
| References | |
| EP 1.91 | |
| Download: ML073170393 (14) | |
Text
Survey Unit Release Record Design # EP-1.91 Revision # Original Page 1 of 3 Survey Unit #(s) 1.91
- 1) Embedded Pipe (EP) Survey Unit 1.91 meets the definition of embedded pipe for Plum Brook Reactor Facility (PBRF).
- 2) EP 1.91 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 1.91 were performed using a scintillation detector optimized to measure gamma energies representative of Cs-137. Sample #EP 3-12 fiom 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 BSWS-002, WEP 05-006, these determinations are appropriate for the types of radiation involved and the media being surveyed.
Approval Signatures FSSICharacterization Engineer v -
FSS Design # EP 1.91 Revision # Original Page 2 of 3 I Survey Unit: 1.91 I 1.1 The subject pipe system is a 6" floor drain line located on the -27'el.
valve pit of the Rx building.
1.2 EP 1.91consists of 6"diameter piping that is approximately 30 feet in length.
2.0 Survey Design Information 2.1 EP 1.91 was surveyed IAW Procedure #BSIkVS-002.
2.2 1W ? of the 6" ID pipe was accessible for suvey. The accessible 6" ID pipe was surveyed by static measurement at one foot increments, for a total of 30 survey measurements.
2.3 Surface area for the 6" ID piping is 1,459ad for each foot of piping, corresponding to a total 6" ID piping surface area of 43,780crn2(4.4mZ) for the entire length of (approximately 30') of 6" piping.
3.0 Survey Unit Measurement Locationfiata 3.1 Pipe interior radiological survey forms are provided in Attachment 2 of this release record.
4.0 Survey Unit InvestigationdResults 4.1 None 5.0 Data Assessment Results 5.1 Data assessment results are provided in the EPiBuried Pipe (J3P) 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 mrendyr dose goal established in Table 3-3 of the FSSP.
5.3 When implementing the Unity Rule, provided in Section 3.6.3of the FSSP, and applying the Nuclide Fraction (NF), provided in TBD-06-004, the survey unit that is constituted by EP 1.91passes FSS.
5.4 Background was not subtracted from the survey measurements and the Elevated Measurement Comparison W C ) was not employed for this survey unit.
I FSS Design # E P 1.91 I Revision # Original I page30f3 I I Survey Unit: 1.91 I 5.5 Statistical Summary Table Statistical Parameter 6.0 Documentation of evaluations pertaining to compliance with the unrestricted use limit of 25 mrem/yr and dose contributions &om Embedded Pipe and radionuclides contributing 10% in aggregate of the total dose fbr both structural scenarios and soils.
6.1 A review of the survey results has shown that the dose contribution for EF' 1.91 to be less than 1 mrem/yr. The dose contribution is estimated to be 0.006 mremtyr 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 EF' 1.91 & Spreadsheet
SECTION 7 ATTACHMENT 1 3 PAGE(S)
BSI EPlBP SURVEY REPORT DotectorSled# Blemn 1MGlAVSln07 Detector E(IWcncy Survey UNt Classlfimtton TBD (36-004 P~pmgGroup 31 SR-13Radlonucltde DMnbulion Sampk EP 3-12 Measured Nudlde Cs-1W Area FactortEMC Used No PasslFall FSS Pass MREMMR Contnbutlon el COMMENTS' ACTMTYVALUES NOT BACKGROUNDCORRECTED RP Eng~nearIDate 07
EP 1.91 6" Pipe TBD 06-004 Group 3.1
EP 1.91 6" Pipe TBD 06-004 Group 3.1
SECTION 7 ATTACHMENT 2 3 PAGE(S)
BSI/LVSPipeCrawler-002 Revision 4 Pipe Interior Radiological Survey Form Date: I I,/! 3 /O 6 Time: /$I7 Pipe ID#: 1.11 Pipe Diameter: Access Point Area: V k up p, Building: !&I L A O Elevation: System: ~ L RJ ~ R O Type of Survey Investigation Characterization Final Survey , Other J Gross C06O Cs I/
Detector ID#I Sled ID# / u?l6 I C V S -/ / A Detector Cal Date: 1 7 / % 0 / .d $ Detector Cal Due Date: I Z/ZO / O 6 Instrument: 2 3 3 - I Instrument I D #: Zo34StiL Instrument Cal Date: 7 1 T/O 6 Instrument Cal Due Date: - a 7 I
From the Daily Pipe Survey Detector Control Form for the Selected Detector Background Value 9, 7. cpm mCRs~tic I?,Z cpm Efficiency Factor for Pipe Diameter 0,ooo 33 (from detector efficiency determination) mcstatic 3\0b dpm/ 1 6 0 cm2 Is the MDCStati,acceptable? No (if no, adjust sample count time and recalculate MDCR+,tic) comments: s ~ POST ~ ~wE L O S v~f l ~ G y &P3-12 COMPLE~E prnnmJE2+ - GL~SOW A Technician Signature
/
Pipe Interior Radiological Survey Package Page 1 of 3 Attachment 3, Page 1
BSIiLVSPipeCrawler-002 Revision 4 Pipe Interior Radiological Survey Form (Continuation Form)
Date: 11//3/0 6 Pipe ID#: 'q f Pipe Diameter: 6" Access Point Area: vh L.E. P/ -j Building: %I- %I(M Elevation: -27 System: F ~ P W. -
Package Page 2of 3 Attachment 3, Page 2
SECTION 7 ATTACHMENT 3 f PAGE(S)
Page 1 of 1 SECTION 7 ATTACHMENT 4 1 DISC